TY  - JOUR
AU  - Miladinović, Marija
AU  - Pavlović, Stefan
AU  - Banković-Ilić, Ivana
AU  - Kostić, Milan
AU  - Stamenković, Olivera
AU  - Veljković, Vlada
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7206
AB  - Possibilities of using waste plum stones in biodiesel production were investigated. The plum kernels were used as a source to obtain oil by the Soxhlet extraction method, while the whole plum stones, the plum stone shells that remained after the crashing, and the plum kernel cake that remained after the oil extraction, were burned off to obtain ashes. The collected ashes were characterized by elemental composition, porosity, and base strength and tested for catalytic activity in transesterification of esterified plum kernel oil. Dominant elements were potassium, calcium, and magnesium at different contents in the three obtained ashes. The most active catalyst was the plum stone shell ash, so the effect of temperature (40, 50, and 60°C) on the reaction rate was investigated. The reaction rate constant increased with the reaction temperature with the activation energy value of 58.8 kJ mol-1. In addition, the plum stone shell ash can be reused as a catalyst after recalcination.
AB  - U ovom radu istraživana je mogućnost korišćenja otpadnih koštica šljive u proizvodnji biodizela. Jezgra  šljive su iskorišćena kao sirovina za dobijanje ulja primenom Soxhlet-ove metode ekstrakcije. Cele  koštice, ljuske koštica šljive i pogača dobijena nakon ekstrakcije ulja iz jezgra šljive spaljeni su da bi se  dobio pepeo, koji je korišćen kao katalizator. Dobijene tri vrste sakupljenog pepela su najpre  okarakterisane u pogledu hemijskog sastava, poroznosti i baznosti, a zatim je testirana katalitička  aktivnost u transesterifikaciji esterifikovanog ulja koštica šljive. Dominantni elementi u pepelu, kao što  su kalijum, kalcijum i magnezijum, imali su različit sadržaj u sve tri vrste pepela. Najveću katalitičku  aktivnost pokazao je pepeo koštica šljive, zbog čega je dalje istraživan uticaj temperature (40, 50 i 60 °C)  na brzinu reakcije katalizovane ovim pepelom. Konstanta brzine reakcije povećavala se sa porastom  temperature reakcije, a vrednost energije aktivacije je 58,8 kJ mol-1 . Pored toga, pepeo koštica šljive  može se ponovo koristiti kao katalizator nakon rekalcinacije.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Utilization of waste plum stones as a source of oil and catalyst for biodiesel production
T1  - Korišćenje otpadnih koštica šljive kao izvora ulja i katalizatora za  proizvodnju biodizela
VL  - 77
IS  - 1
SP  - 39
EP  - 52
DO  - 10.2298/HEMIND221113009M
ER  - 

@article{
author = "Miladinović, Marija and Pavlović, Stefan and Banković-Ilić, Ivana and Kostić, Milan and Stamenković, Olivera and Veljković, Vlada",
year = "2023",
abstract = "Possibilities of using waste plum stones in biodiesel production were investigated. The plum kernels were used as a source to obtain oil by the Soxhlet extraction method, while the whole plum stones, the plum stone shells that remained after the crashing, and the plum kernel cake that remained after the oil extraction, were burned off to obtain ashes. The collected ashes were characterized by elemental composition, porosity, and base strength and tested for catalytic activity in transesterification of esterified plum kernel oil. Dominant elements were potassium, calcium, and magnesium at different contents in the three obtained ashes. The most active catalyst was the plum stone shell ash, so the effect of temperature (40, 50, and 60°C) on the reaction rate was investigated. The reaction rate constant increased with the reaction temperature with the activation energy value of 58.8 kJ mol-1. In addition, the plum stone shell ash can be reused as a catalyst after recalcination., U ovom radu istraživana je mogućnost korišćenja otpadnih koštica šljive u proizvodnji biodizela. Jezgra  šljive su iskorišćena kao sirovina za dobijanje ulja primenom Soxhlet-ove metode ekstrakcije. Cele  koštice, ljuske koštica šljive i pogača dobijena nakon ekstrakcije ulja iz jezgra šljive spaljeni su da bi se  dobio pepeo, koji je korišćen kao katalizator. Dobijene tri vrste sakupljenog pepela su najpre  okarakterisane u pogledu hemijskog sastava, poroznosti i baznosti, a zatim je testirana katalitička  aktivnost u transesterifikaciji esterifikovanog ulja koštica šljive. Dominantni elementi u pepelu, kao što  su kalijum, kalcijum i magnezijum, imali su različit sadržaj u sve tri vrste pepela. Najveću katalitičku  aktivnost pokazao je pepeo koštica šljive, zbog čega je dalje istraživan uticaj temperature (40, 50 i 60 °C)  na brzinu reakcije katalizovane ovim pepelom. Konstanta brzine reakcije povećavala se sa porastom  temperature reakcije, a vrednost energije aktivacije je 58,8 kJ mol-1 . Pored toga, pepeo koštica šljive  može se ponovo koristiti kao katalizator nakon rekalcinacije.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Utilization of waste plum stones as a source of oil and catalyst for biodiesel production, Korišćenje otpadnih koštica šljive kao izvora ulja i katalizatora za  proizvodnju biodizela",
volume = "77",
number = "1",
pages = "39-52",
doi = "10.2298/HEMIND221113009M"
}

Miladinović, M., Pavlović, S., Banković-Ilić, I., Kostić, M., Stamenković, O.,& Veljković, V.. (2023). Utilization of waste plum stones as a source of oil and catalyst for biodiesel production. in Hemijska industrija
Association of Chemical Engineers of Serbia., 77(1), 39-52.
https://doi.org/10.2298/HEMIND221113009M

Miladinović M, Pavlović S, Banković-Ilić I, Kostić M, Stamenković O, Veljković V. Utilization of waste plum stones as a source of oil and catalyst for biodiesel production. in Hemijska industrija. 2023;77(1):39-52.
doi:10.2298/HEMIND221113009M .

Miladinović, Marija, Pavlović, Stefan, Banković-Ilić, Ivana, Kostić, Milan, Stamenković, Olivera, Veljković, Vlada, "Utilization of waste plum stones as a source of oil and catalyst for biodiesel production" in Hemijska industrija, 77, no. 1 (2023):39-52,
https://doi.org/10.2298/HEMIND221113009M . .

TY  - JOUR
AU  - Miladinović, Marija M.
AU  - Krstić, Jugoslav
AU  - Zdujić, Miodrag V.
AU  - Veselinović, Ljiljana M.
AU  - Veljović, Đorđe
AU  - Banković-Ilić, Ivana B.
AU  - Stamenković, Olivera
AU  - Veljković, Vlada B.
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4868
AB  - Hazelnut shell ash was investigated as a new base catalyst for the transesterification of used cooking sunflower oil to biodiesel. To understand its catalytic properties, the prepared ash was characterized by EDX, XRD, TGA/DTA, Hg porosimetry, N2 physisorption, FE-SEM, and basic strength measurements. The effects of the catalyst loading in the range of 1–5% of the oil weight and the methanol-to-oil molar ratio of 6:1–18:1 on the kinetics of the fatty acid methyl esters synthesis were established. Moreover, the leaching and reusability of the catalyst were assessed. The obtained results revealed that hazelnut shell ash was mostly composed of K, Ca, and Mg. The highest ester content (98%) was achieved at the catalyst loading of 5%, the methanol-to-oil molar ratio of 12:1, and the reaction time of 10 min. The contribution of homogeneous catalysis because of the catalyst leaching was confirmed but did not determine the overall reaction rate. The catalyst can be reused after the recalcination at 800 °C for 2 h achieving the high methyl esters content (>96%) in 30 min after three subsequent runs. The overall reaction followed the pseudo-first-order kinetics with respect to triacylglycerols. A linear relationship between the apparent reaction rate constant and the catalyst loading and the methanol-to-oil molar ratio was determined. The determined value of the reaction rate constant was 0.0576 dm6/(min•mol2).
PB  - Elsevier
T2  - Renewable Energy
T1  - Transesterification of used cooking sunflower oil catalyzed by hazelnut shell ash
VL  - 183
SP  - 103
EP  - 113
DO  - 10.1016/j.renene.2021.10.071
ER  - 

@article{
author = "Miladinović, Marija M. and Krstić, Jugoslav and Zdujić, Miodrag V. and Veselinović, Ljiljana M. and Veljović, Đorđe and Banković-Ilić, Ivana B. and Stamenković, Olivera and Veljković, Vlada B.",
year = "2022",
abstract = "Hazelnut shell ash was investigated as a new base catalyst for the transesterification of used cooking sunflower oil to biodiesel. To understand its catalytic properties, the prepared ash was characterized by EDX, XRD, TGA/DTA, Hg porosimetry, N2 physisorption, FE-SEM, and basic strength measurements. The effects of the catalyst loading in the range of 1–5% of the oil weight and the methanol-to-oil molar ratio of 6:1–18:1 on the kinetics of the fatty acid methyl esters synthesis were established. Moreover, the leaching and reusability of the catalyst were assessed. The obtained results revealed that hazelnut shell ash was mostly composed of K, Ca, and Mg. The highest ester content (98%) was achieved at the catalyst loading of 5%, the methanol-to-oil molar ratio of 12:1, and the reaction time of 10 min. The contribution of homogeneous catalysis because of the catalyst leaching was confirmed but did not determine the overall reaction rate. The catalyst can be reused after the recalcination at 800 °C for 2 h achieving the high methyl esters content (>96%) in 30 min after three subsequent runs. The overall reaction followed the pseudo-first-order kinetics with respect to triacylglycerols. A linear relationship between the apparent reaction rate constant and the catalyst loading and the methanol-to-oil molar ratio was determined. The determined value of the reaction rate constant was 0.0576 dm6/(min•mol2).",
publisher = "Elsevier",
journal = "Renewable Energy",
title = "Transesterification of used cooking sunflower oil catalyzed by hazelnut shell ash",
volume = "183",
pages = "103-113",
doi = "10.1016/j.renene.2021.10.071"
}

Miladinović, M. M., Krstić, J., Zdujić, M. V., Veselinović, L. M., Veljović, Đ., Banković-Ilić, I. B., Stamenković, O.,& Veljković, V. B.. (2022). Transesterification of used cooking sunflower oil catalyzed by hazelnut shell ash. in Renewable Energy
Elsevier., 183, 103-113.
https://doi.org/10.1016/j.renene.2021.10.071

Miladinović MM, Krstić J, Zdujić MV, Veselinović LM, Veljović Đ, Banković-Ilić IB, Stamenković O, Veljković VB. Transesterification of used cooking sunflower oil catalyzed by hazelnut shell ash. in Renewable Energy. 2022;183:103-113.
doi:10.1016/j.renene.2021.10.071 .

Miladinović, Marija M., Krstić, Jugoslav, Zdujić, Miodrag V., Veselinović, Ljiljana M., Veljović, Đorđe, Banković-Ilić, Ivana B., Stamenković, Olivera, Veljković, Vlada B., "Transesterification of used cooking sunflower oil catalyzed by hazelnut shell ash" in Renewable Energy, 183 (2022):103-113,
https://doi.org/10.1016/j.renene.2021.10.071 . .

TY  - JOUR
AU  - Krstić, Jugoslav
AU  - Nježić, Zvonko B.
AU  - Kostić, Milan D.
AU  - Marić, Boško D.
AU  - Šimurina, Olivera D.
AU  - Stamenković, Olivera
AU  - Veljković, Vlada
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5402
AB  - A solid catalyst was prepared from waste filter cake (WFC) from a sugar beet processing plant and used, after calcination at 900 °C within 2 h, for biodiesel production from rapeseed oil and methanol. The calcined WFC (CFC) catalyst was characterized by XRF, FTIR, XRD, TGA/DTG, TPDe, TPD-CO2, SEM, N2 physisorption, and Hg porosimetry. The CFC is a CaO-based catalyst with a rigid, sustainable macroporous structure with the largest particles of 2.0 × 0.5 µm, a specific surface area of 7.3 m2/g, and a basicity of 0.27 mmol/g. It provides high conversion of 97.9% in 1 h at the methanol-to-oil molar ratio of 9:1, the temperature of 60 °C, and the catalyst loading of 10% of the oil mass. Its catalytic efficiency is comparable to the WFC-based nanocatalysts and CaO-based catalysts from natural sources. CFC was reused twice with a negligible decrease in catalytic activity, ensuring a FAME content above 97% in 1 h. The biodiesel produced from rapeseed oil over the CFC catalyst has good fuel properties that fulfill most of EN 14214. Therefore, WFC is a promising source of a low-cost, highly active, basic, and environmentally friendly CFC catalyst, which could reduce biodiesel production costs. From this point of view, this catalyst has great potential for developing the process at the commercial level.
PB  - Elsevier
T2  - Process Safety and Environmental Protection
T1  - Biodiesel production from rapeseed oil over calcined waste filter cake from sugar beet processing
VL  - 168
SP  - 463
EP  - 473
DO  - 10.1016/j.psep.2022.10.021
ER  - 

@article{
author = "Krstić, Jugoslav and Nježić, Zvonko B. and Kostić, Milan D. and Marić, Boško D. and Šimurina, Olivera D. and Stamenković, Olivera and Veljković, Vlada",
year = "2022",
abstract = "A solid catalyst was prepared from waste filter cake (WFC) from a sugar beet processing plant and used, after calcination at 900 °C within 2 h, for biodiesel production from rapeseed oil and methanol. The calcined WFC (CFC) catalyst was characterized by XRF, FTIR, XRD, TGA/DTG, TPDe, TPD-CO2, SEM, N2 physisorption, and Hg porosimetry. The CFC is a CaO-based catalyst with a rigid, sustainable macroporous structure with the largest particles of 2.0 × 0.5 µm, a specific surface area of 7.3 m2/g, and a basicity of 0.27 mmol/g. It provides high conversion of 97.9% in 1 h at the methanol-to-oil molar ratio of 9:1, the temperature of 60 °C, and the catalyst loading of 10% of the oil mass. Its catalytic efficiency is comparable to the WFC-based nanocatalysts and CaO-based catalysts from natural sources. CFC was reused twice with a negligible decrease in catalytic activity, ensuring a FAME content above 97% in 1 h. The biodiesel produced from rapeseed oil over the CFC catalyst has good fuel properties that fulfill most of EN 14214. Therefore, WFC is a promising source of a low-cost, highly active, basic, and environmentally friendly CFC catalyst, which could reduce biodiesel production costs. From this point of view, this catalyst has great potential for developing the process at the commercial level.",
publisher = "Elsevier",
journal = "Process Safety and Environmental Protection",
title = "Biodiesel production from rapeseed oil over calcined waste filter cake from sugar beet processing",
volume = "168",
pages = "463-473",
doi = "10.1016/j.psep.2022.10.021"
}

Krstić, J., Nježić, Z. B., Kostić, M. D., Marić, B. D., Šimurina, O. D., Stamenković, O.,& Veljković, V.. (2022). Biodiesel production from rapeseed oil over calcined waste filter cake from sugar beet processing. in Process Safety and Environmental Protection
Elsevier., 168, 463-473.
https://doi.org/10.1016/j.psep.2022.10.021

Krstić J, Nježić ZB, Kostić MD, Marić BD, Šimurina OD, Stamenković O, Veljković V. Biodiesel production from rapeseed oil over calcined waste filter cake from sugar beet processing. in Process Safety and Environmental Protection. 2022;168:463-473.
doi:10.1016/j.psep.2022.10.021 .

Krstić, Jugoslav, Nježić, Zvonko B., Kostić, Milan D., Marić, Boško D., Šimurina, Olivera D., Stamenković, Olivera, Veljković, Vlada, "Biodiesel production from rapeseed oil over calcined waste filter cake from sugar beet processing" in Process Safety and Environmental Protection, 168 (2022):463-473,
https://doi.org/10.1016/j.psep.2022.10.021 . .

TY  - JOUR
AU  - Veličković, Ana
AU  - Avramović, Jelena M.
AU  - Kostić, Milan
AU  - Krstić, Jugoslav
AU  - Stamenković, Olivera
AU  - Veljković, Vlada B.
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4844
AB  - Wheat straw ash (WSA) was investigated as a new catalyst in biodiesel production from sunflower oil. The catalyst was characterized by temperature-programmed decomposition, X-ray powder diffraction, Hg porosimetry, N2 physisorption, and scanning electron microscopy - energy dispersive X-ray spectroscopy methods. The methanolysis reaction was tested in the temperature range of 55–65 oC, the catalyst loading range 10–20 % of the oil weight, and the methanol-to-oil molar ratio range 18 : 1–24 : 1. The reaction conditions of the sunflower oil methanolysis over WSA were optimized by using the response surface methodology in combination with the historical experimental design. The optimum process conditions ensuring the highest fatty acid methyl esters (FAME) content of 98.6 % were the reaction temperature of 60.3 oC, the catalyst loading of 11.6 % (based on the oil weight), the methanol-to-oil molar ratio of 18.3 :1, and the reaction time of 124 min. The values of the statistical criteria, such as coefficients of determination (R2 = 0.811, R2pred = 0.789, R2adj = 0.761) and the mean relative percent deviation (MRPD) value of 10.6 % (66 data) implied the acceptability and precision of the developed model. The FAME content after 4 h of reaction under the optimal conditions decreased to 37, 12, and 3 %, after the first, second, and third reuse, respectively.
AB  - Pepeo pšenične slame (PPS) je korišćen kao katalizator u proizvodnji biodizela iz sunco-kretovog ulja. Karakterizacija katalizatora je izvršena primenom metoda tempera-turski programiranom razgradnjom (temperature-programmed decomposition, TPDe), rentgenskom difrakcijom (X-ray diffraction, XRD), Hg porozimetrijom, N2 fizi-sorpcijom i skenirajućom elektronskom mikrosopijom sa energo-disperzivnom spek-trometrijom (scanning electron microscopy and energy dispersive X-ray spectroscopy, SEM-EDS). Reakcija metanolize istraživana je pri sledećim reakcionim uslovima: tem-peraturni opseg 55-65 °C; količina katalizatora 10-20 % (računato na masu ulja) i opseg molskog odnosa methanol : ulje 18 : 1 – 24 : 1. Optimizacija reakcionih uslova izvršena je metodologijom površine odziva u kombinaciji sa istorijskim eksperimentalnim planom. Maksimalni prinos metil estara masnih kiselina (MEMK) od 98,6 % postignut je pri sledećim optimalnim reakcionim uslovima: temperatura 60,3 oC, količina katalizatora 11,6 % (računato na masu ulja), molski odnos methanol : ulje 18,3 : 1 i vreme trajanja reakcije 124 min. Vrednosti koeficijenata determinacije (R2 = 0,811, R2pred = 0,789, R2adj = 0,761) i srednjeg relativnog odstupanja (10,6 %, 66 podataka) ukazali su na prihvatljivost i pouzdanost razvijenog modela. Sadržaj MEMK nakon 4 h reakcije pri optimalnim uslovima smanjen je na 37, 12 i 3 % nakon prve, druge i treće upotrebe katalizatora, redom.
PB  - Belgrade : Association of the Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Modeling the biodiesel production using the wheat straw ash as a catalyst
T1  - Pepeo pšenične slame kao katalizator u proizvodnji biodizela
VL  - 75
IS  - 5
SP  - 257
EP  - 276
DO  - 10.2298/HEMIND210526028V
ER  - 

@article{
author = "Veličković, Ana and Avramović, Jelena M. and Kostić, Milan and Krstić, Jugoslav and Stamenković, Olivera and Veljković, Vlada B.",
year = "2021",
abstract = "Wheat straw ash (WSA) was investigated as a new catalyst in biodiesel production from sunflower oil. The catalyst was characterized by temperature-programmed decomposition, X-ray powder diffraction, Hg porosimetry, N2 physisorption, and scanning electron microscopy - energy dispersive X-ray spectroscopy methods. The methanolysis reaction was tested in the temperature range of 55–65 oC, the catalyst loading range 10–20 % of the oil weight, and the methanol-to-oil molar ratio range 18 : 1–24 : 1. The reaction conditions of the sunflower oil methanolysis over WSA were optimized by using the response surface methodology in combination with the historical experimental design. The optimum process conditions ensuring the highest fatty acid methyl esters (FAME) content of 98.6 % were the reaction temperature of 60.3 oC, the catalyst loading of 11.6 % (based on the oil weight), the methanol-to-oil molar ratio of 18.3 :1, and the reaction time of 124 min. The values of the statistical criteria, such as coefficients of determination (R2 = 0.811, R2pred = 0.789, R2adj = 0.761) and the mean relative percent deviation (MRPD) value of 10.6 % (66 data) implied the acceptability and precision of the developed model. The FAME content after 4 h of reaction under the optimal conditions decreased to 37, 12, and 3 %, after the first, second, and third reuse, respectively., Pepeo pšenične slame (PPS) je korišćen kao katalizator u proizvodnji biodizela iz sunco-kretovog ulja. Karakterizacija katalizatora je izvršena primenom metoda tempera-turski programiranom razgradnjom (temperature-programmed decomposition, TPDe), rentgenskom difrakcijom (X-ray diffraction, XRD), Hg porozimetrijom, N2 fizi-sorpcijom i skenirajućom elektronskom mikrosopijom sa energo-disperzivnom spek-trometrijom (scanning electron microscopy and energy dispersive X-ray spectroscopy, SEM-EDS). Reakcija metanolize istraživana je pri sledećim reakcionim uslovima: tem-peraturni opseg 55-65 °C; količina katalizatora 10-20 % (računato na masu ulja) i opseg molskog odnosa methanol : ulje 18 : 1 – 24 : 1. Optimizacija reakcionih uslova izvršena je metodologijom površine odziva u kombinaciji sa istorijskim eksperimentalnim planom. Maksimalni prinos metil estara masnih kiselina (MEMK) od 98,6 % postignut je pri sledećim optimalnim reakcionim uslovima: temperatura 60,3 oC, količina katalizatora 11,6 % (računato na masu ulja), molski odnos methanol : ulje 18,3 : 1 i vreme trajanja reakcije 124 min. Vrednosti koeficijenata determinacije (R2 = 0,811, R2pred = 0,789, R2adj = 0,761) i srednjeg relativnog odstupanja (10,6 %, 66 podataka) ukazali su na prihvatljivost i pouzdanost razvijenog modela. Sadržaj MEMK nakon 4 h reakcije pri optimalnim uslovima smanjen je na 37, 12 i 3 % nakon prve, druge i treće upotrebe katalizatora, redom.",
publisher = "Belgrade : Association of the Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Modeling the biodiesel production using the wheat straw ash as a catalyst, Pepeo pšenične slame kao katalizator u proizvodnji biodizela",
volume = "75",
number = "5",
pages = "257-276",
doi = "10.2298/HEMIND210526028V"
}

Veličković, A., Avramović, J. M., Kostić, M., Krstić, J., Stamenković, O.,& Veljković, V. B.. (2021). Modeling the biodiesel production using the wheat straw ash as a catalyst. in Hemijska industrija
Belgrade : Association of the Chemical Engineers of Serbia., 75(5), 257-276.
https://doi.org/10.2298/HEMIND210526028V

Veličković A, Avramović JM, Kostić M, Krstić J, Stamenković O, Veljković VB. Modeling the biodiesel production using the wheat straw ash as a catalyst. in Hemijska industrija. 2021;75(5):257-276.
doi:10.2298/HEMIND210526028V .

Veličković, Ana, Avramović, Jelena M., Kostić, Milan, Krstić, Jugoslav, Stamenković, Olivera, Veljković, Vlada B., "Modeling the biodiesel production using the wheat straw ash as a catalyst" in Hemijska industrija, 75, no. 5 (2021):257-276,
https://doi.org/10.2298/HEMIND210526028V . .

TY  - JOUR
AU  - Pavlović, Stefan
AU  - Marinković, Dalibor
AU  - Kostić, Milan
AU  - Lončarević, Davor
AU  - Mojović, Ljiljana
AU  - Stanković, Miroslav
AU  - Veljković, Vlada B.
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4035
AB  - Lignite coal fly ash (FA) from a domestic thermal power plant was converted into a pure cancrinite zeolitic material (ZMFA) using a novel, custom-made, rotating autoclave reactor system by a short-term alkali activation process. The obtained ZMFA was used as catalyst support of calcium oxide as an active component derived from waste chicken eggshells (ES). The ZMFA supported calcium oxide catalyst (xCaO/ZMFA) was synthesized by means of the ultrasound-assisted method. The influence of different concentrations of dispersed calcium oxide (x = 5–20 wt%) over ZMFA and thermal treatment at different temperatures (450–600 °C) were studied. The structural and morphological characterization showed that the original cancrinite structure was preserved. The basicity and textural properties indicated the presence of strong active sites in a well-defined pore network suitable for the reactions of bulky organic compounds such as triacylglycerols (TAGs). The highest activity (96.5% of fatty acid methyl esters) in the methanolysis of sunflower oil was achieved with the 20CaO/ZMFA catalyst under reaction conditions: temperature of 60 °C, methanol/oil molar ratio of 12:1, catalyst concentration of 4 wt%, and reaction time of 2 h. It was found that the optimal calcination temperature of the catalyst precursor was 550 °C. At calcination temperatures above 550 °C, the melting of the glassy phase became more intense whereby the molten phase partially reacted with calcium oxide forming the catalytically inactive calcium silicate compounds (wollastonite, larnite, etc.). The rate constants of the two tested kinetic models were correlated with the concentrations of active calcium oxide. The MRPD of both models was low indicating their reliability.
PB  - Elsevier
T2  - Fuel
T1  - The chicken eggshell calcium oxide ultrasonically dispersed over lignite coal fly ash-based cancrinite zeolite support as a catalyst for biodiesel production
VL  - 289
SP  - 119912
DO  - 10.1016/j.fuel.2020.119912
ER  - 

@article{
author = "Pavlović, Stefan and Marinković, Dalibor and Kostić, Milan and Lončarević, Davor and Mojović, Ljiljana and Stanković, Miroslav and Veljković, Vlada B.",
year = "2021",
abstract = "Lignite coal fly ash (FA) from a domestic thermal power plant was converted into a pure cancrinite zeolitic material (ZMFA) using a novel, custom-made, rotating autoclave reactor system by a short-term alkali activation process. The obtained ZMFA was used as catalyst support of calcium oxide as an active component derived from waste chicken eggshells (ES). The ZMFA supported calcium oxide catalyst (xCaO/ZMFA) was synthesized by means of the ultrasound-assisted method. The influence of different concentrations of dispersed calcium oxide (x = 5–20 wt%) over ZMFA and thermal treatment at different temperatures (450–600 °C) were studied. The structural and morphological characterization showed that the original cancrinite structure was preserved. The basicity and textural properties indicated the presence of strong active sites in a well-defined pore network suitable for the reactions of bulky organic compounds such as triacylglycerols (TAGs). The highest activity (96.5% of fatty acid methyl esters) in the methanolysis of sunflower oil was achieved with the 20CaO/ZMFA catalyst under reaction conditions: temperature of 60 °C, methanol/oil molar ratio of 12:1, catalyst concentration of 4 wt%, and reaction time of 2 h. It was found that the optimal calcination temperature of the catalyst precursor was 550 °C. At calcination temperatures above 550 °C, the melting of the glassy phase became more intense whereby the molten phase partially reacted with calcium oxide forming the catalytically inactive calcium silicate compounds (wollastonite, larnite, etc.). The rate constants of the two tested kinetic models were correlated with the concentrations of active calcium oxide. The MRPD of both models was low indicating their reliability.",
publisher = "Elsevier",
journal = "Fuel",
title = "The chicken eggshell calcium oxide ultrasonically dispersed over lignite coal fly ash-based cancrinite zeolite support as a catalyst for biodiesel production",
volume = "289",
pages = "119912",
doi = "10.1016/j.fuel.2020.119912"
}

Pavlović, S., Marinković, D., Kostić, M., Lončarević, D., Mojović, L., Stanković, M.,& Veljković, V. B.. (2021). The chicken eggshell calcium oxide ultrasonically dispersed over lignite coal fly ash-based cancrinite zeolite support as a catalyst for biodiesel production. in Fuel
Elsevier., 289, 119912.
https://doi.org/10.1016/j.fuel.2020.119912

Pavlović S, Marinković D, Kostić M, Lončarević D, Mojović L, Stanković M, Veljković VB. The chicken eggshell calcium oxide ultrasonically dispersed over lignite coal fly ash-based cancrinite zeolite support as a catalyst for biodiesel production. in Fuel. 2021;289:119912.
doi:10.1016/j.fuel.2020.119912 .

Pavlović, Stefan, Marinković, Dalibor, Kostić, Milan, Lončarević, Davor, Mojović, Ljiljana, Stanković, Miroslav, Veljković, Vlada B., "The chicken eggshell calcium oxide ultrasonically dispersed over lignite coal fly ash-based cancrinite zeolite support as a catalyst for biodiesel production" in Fuel, 289 (2021):119912,
https://doi.org/10.1016/j.fuel.2020.119912 . .

TY  - JOUR
AU  - Miladinović, Marija R.
AU  - Zdujić, Miodrag
AU  - Veljović, Đorđe
AU  - Krstić, Jugoslav
AU  - Banković-Ilić, Ivana B.
AU  - Veljković, Vlada B.
AU  - Stamenković, Olivera
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3217
AB  - The catalytic activity of the walnut shell ash was investigated in the biodiesel production by the sunflower oil methanolysis. The catalyst was characterized by the TG-DTA, XRD, Hg porosimetry, N2 physisorption, SEM, and Hammett method. In addition, the effects of the catalyst loading and the methanol-to-oil molar ratio on the methyl esters synthesis were tested at the reaction temperature of 60 °C. The walnut shell ash provided a very fast reaction and a high FAME content (over 98%). As the reaction occurred in the absence of triacylglycerols mass transfer limitation, the pseudo-first-order model was employed for describing the kinetics of the reaction. The catalyst was successfully reused four times after the regeneration of the catalytic activity by recalcination at 800 °C.
PB  - Elsevier
T2  - Renewable Energy
T1  - Valorization of walnut shell ash as a catalyst for biodiesel production
VL  - 147
SP  - 1033
EP  - 1043
DO  - 10.1016/j.renene.2019.09.056
ER  - 

@article{
author = "Miladinović, Marija R. and Zdujić, Miodrag and Veljović, Đorđe and Krstić, Jugoslav and Banković-Ilić, Ivana B. and Veljković, Vlada B. and Stamenković, Olivera",
year = "2020",
abstract = "The catalytic activity of the walnut shell ash was investigated in the biodiesel production by the sunflower oil methanolysis. The catalyst was characterized by the TG-DTA, XRD, Hg porosimetry, N2 physisorption, SEM, and Hammett method. In addition, the effects of the catalyst loading and the methanol-to-oil molar ratio on the methyl esters synthesis were tested at the reaction temperature of 60 °C. The walnut shell ash provided a very fast reaction and a high FAME content (over 98%). As the reaction occurred in the absence of triacylglycerols mass transfer limitation, the pseudo-first-order model was employed for describing the kinetics of the reaction. The catalyst was successfully reused four times after the regeneration of the catalytic activity by recalcination at 800 °C.",
publisher = "Elsevier",
journal = "Renewable Energy",
title = "Valorization of walnut shell ash as a catalyst for biodiesel production",
volume = "147",
pages = "1033-1043",
doi = "10.1016/j.renene.2019.09.056"
}

Miladinović, M. R., Zdujić, M., Veljović, Đ., Krstić, J., Banković-Ilić, I. B., Veljković, V. B.,& Stamenković, O.. (2020). Valorization of walnut shell ash as a catalyst for biodiesel production. in Renewable Energy
Elsevier., 147, 1033-1043.
https://doi.org/10.1016/j.renene.2019.09.056

Miladinović MR, Zdujić M, Veljović Đ, Krstić J, Banković-Ilić IB, Veljković VB, Stamenković O. Valorization of walnut shell ash as a catalyst for biodiesel production. in Renewable Energy. 2020;147:1033-1043.
doi:10.1016/j.renene.2019.09.056 .

Miladinović, Marija R., Zdujić, Miodrag, Veljović, Đorđe, Krstić, Jugoslav, Banković-Ilić, Ivana B., Veljković, Vlada B., Stamenković, Olivera, "Valorization of walnut shell ash as a catalyst for biodiesel production" in Renewable Energy, 147 (2020):1033-1043,
https://doi.org/10.1016/j.renene.2019.09.056 . .

TY  - JOUR
AU  - Miladinović, Marija R.
AU  - Zdujić, Miodrag
AU  - Veljović, Đorđe
AU  - Krstić, Jugoslav
AU  - Banković-Ilić, Ivana B.
AU  - Veljković, Vlada B.
AU  - Stamenković, Olivera
PY  - 2020
UR  - http://dais.sanu.ac.rs/123456789/6903
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3319
AB  - The catalytic activity of the walnut shell ash was investigated in the biodiesel production by the sunflower oil methanolysis. The catalyst was characterized by the TG-DTA, XRD, Hg porosimetry, N2 physisorption, SEM, and Hammett method. In addition, the effects of the catalyst loading and the methanol-to-oil molar ratio on the methyl esters synthesis were tested at the reaction temperature of 60 °C. The walnut shell ash provided a very fast reaction and a high FAME content (over 98%). As the reaction occurred in the absence of triacylglycerols mass transfer limitation, the pseudo-first-order model was employed for describing the kinetics of the reaction. The catalyst was successfully reused four times after the regeneration of the catalytic activity by recalcination at 800 °C.
PB  - Elsevier
T2  - Renewable Energy
T1  - Valorization of walnut shell ash as a catalyst for biodiesel production
VL  - 147
SP  - 1033
EP  - 1043
DO  - 10.1016/j.renene.2019.09.056
ER  - 

@article{
author = "Miladinović, Marija R. and Zdujić, Miodrag and Veljović, Đorđe and Krstić, Jugoslav and Banković-Ilić, Ivana B. and Veljković, Vlada B. and Stamenković, Olivera",
year = "2020",
abstract = "The catalytic activity of the walnut shell ash was investigated in the biodiesel production by the sunflower oil methanolysis. The catalyst was characterized by the TG-DTA, XRD, Hg porosimetry, N2 physisorption, SEM, and Hammett method. In addition, the effects of the catalyst loading and the methanol-to-oil molar ratio on the methyl esters synthesis were tested at the reaction temperature of 60 °C. The walnut shell ash provided a very fast reaction and a high FAME content (over 98%). As the reaction occurred in the absence of triacylglycerols mass transfer limitation, the pseudo-first-order model was employed for describing the kinetics of the reaction. The catalyst was successfully reused four times after the regeneration of the catalytic activity by recalcination at 800 °C.",
publisher = "Elsevier",
journal = "Renewable Energy",
title = "Valorization of walnut shell ash as a catalyst for biodiesel production",
volume = "147",
pages = "1033-1043",
doi = "10.1016/j.renene.2019.09.056"
}

Miladinović, M. R., Zdujić, M., Veljović, Đ., Krstić, J., Banković-Ilić, I. B., Veljković, V. B.,& Stamenković, O.. (2020). Valorization of walnut shell ash as a catalyst for biodiesel production. in Renewable Energy
Elsevier., 147, 1033-1043.
https://doi.org/10.1016/j.renene.2019.09.056

Miladinović MR, Zdujić M, Veljović Đ, Krstić J, Banković-Ilić IB, Veljković VB, Stamenković O. Valorization of walnut shell ash as a catalyst for biodiesel production. in Renewable Energy. 2020;147:1033-1043.
doi:10.1016/j.renene.2019.09.056 .

Miladinović, Marija R., Zdujić, Miodrag, Veljović, Đorđe, Krstić, Jugoslav, Banković-Ilić, Ivana B., Veljković, Vlada B., Stamenković, Olivera, "Valorization of walnut shell ash as a catalyst for biodiesel production" in Renewable Energy, 147 (2020):1033-1043,
https://doi.org/10.1016/j.renene.2019.09.056 . .

TY  - JOUR
AU  - Pavlović, Stefan
AU  - Marinković, Dalibor
AU  - Kostić, Milan
AU  - Janković-Častvan, Ivona
AU  - Mojović, Ljiljana
AU  - Stanković, Miroslav
AU  - Veljković, Vlada B.
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3423
AB  - The present paper is focused on the development of a new environment-friendly methanolysis catalyst completely
based on waste materials: lignite coal fly ash and chicken eggshells. A novel catalyst based on CaO
supported on a fly ash-based zeolitic material (CaO/FA-ZM) was obtained from a cancrinite-sodalite group
zeolite-like material (vishnevite type) and active CaO by alkali activation in a new miniature autoclave reactor
system and hydration-dehydration. Agitation by rotation of the entire reaction mixture led to a more homogeneous
zeolitic product and saved both time and energy. The obtained catalyst structure corresponds to gismondine
and the crystallographic modification of calcium silicate (α’-dicalcium silicate) with deposited CaO.
The characteristics of the synthesized catalyst were determined using ED-XRF, XRD, FT-IR, SEM, Hg-porosimetry,
N2-physisorption, LDPSA, and Hammett indicators. The CaO/FA-ZM catalyst exhibited a high activity
(97.8% of FAME for only 30 min) and stability (a negligible drop in activity in five consecutive cycles) in the
methanolysis reaction under the optimal reaction conditions (temperature of 60 °C, methanol/oil molar ratio of
6:1, and catalyst concentration of 6 wt%). A kinetic study was performed using two different mechanisms: the
irreversible pseudo-first-order reaction mechanism in two regimes (heterogeneous and homogeneous) and the
changing mechanism combined with the triacylglycerol mass transfer limitation. Both models showed a satisfactory
agreement between the experimental and predicted values of conversion degree (R2 > 0.93), confirming
their validity for the CaO-based heterogeneously catalyzed methanolysis. The values of the activation
energy calculated for both mechanisms were 67.17 and 58.03 kJ mol−1, respectively.
PB  - Elsevier
T2  - Fuel
T1  - A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production
VL  - 267
SP  - 117171
DO  - 10.1016/j.fuel.2020.117171
ER  - 

@article{
author = "Pavlović, Stefan and Marinković, Dalibor and Kostić, Milan and Janković-Častvan, Ivona and Mojović, Ljiljana and Stanković, Miroslav and Veljković, Vlada B.",
year = "2020",
abstract = "The present paper is focused on the development of a new environment-friendly methanolysis catalyst completely
based on waste materials: lignite coal fly ash and chicken eggshells. A novel catalyst based on CaO
supported on a fly ash-based zeolitic material (CaO/FA-ZM) was obtained from a cancrinite-sodalite group
zeolite-like material (vishnevite type) and active CaO by alkali activation in a new miniature autoclave reactor
system and hydration-dehydration. Agitation by rotation of the entire reaction mixture led to a more homogeneous
zeolitic product and saved both time and energy. The obtained catalyst structure corresponds to gismondine
and the crystallographic modification of calcium silicate (α’-dicalcium silicate) with deposited CaO.
The characteristics of the synthesized catalyst were determined using ED-XRF, XRD, FT-IR, SEM, Hg-porosimetry,
N2-physisorption, LDPSA, and Hammett indicators. The CaO/FA-ZM catalyst exhibited a high activity
(97.8% of FAME for only 30 min) and stability (a negligible drop in activity in five consecutive cycles) in the
methanolysis reaction under the optimal reaction conditions (temperature of 60 °C, methanol/oil molar ratio of
6:1, and catalyst concentration of 6 wt%). A kinetic study was performed using two different mechanisms: the
irreversible pseudo-first-order reaction mechanism in two regimes (heterogeneous and homogeneous) and the
changing mechanism combined with the triacylglycerol mass transfer limitation. Both models showed a satisfactory
agreement between the experimental and predicted values of conversion degree (R2 > 0.93), confirming
their validity for the CaO-based heterogeneously catalyzed methanolysis. The values of the activation
energy calculated for both mechanisms were 67.17 and 58.03 kJ mol−1, respectively.",
publisher = "Elsevier",
journal = "Fuel",
title = "A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production",
volume = "267",
pages = "117171",
doi = "10.1016/j.fuel.2020.117171"
}

Pavlović, S., Marinković, D., Kostić, M., Janković-Častvan, I., Mojović, L., Stanković, M.,& Veljković, V. B.. (2020). A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production. in Fuel
Elsevier., 267, 117171.
https://doi.org/10.1016/j.fuel.2020.117171

Pavlović S, Marinković D, Kostić M, Janković-Častvan I, Mojović L, Stanković M, Veljković VB. A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production. in Fuel. 2020;267:117171.
doi:10.1016/j.fuel.2020.117171 .

Pavlović, Stefan, Marinković, Dalibor, Kostić, Milan, Janković-Častvan, Ivona, Mojović, Ljiljana, Stanković, Miroslav, Veljković, Vlada B., "A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production" in Fuel, 267 (2020):117171,
https://doi.org/10.1016/j.fuel.2020.117171 . .

TY  - GEN
AU  - Kostić, Milan
AU  - Đalović, Ivica
AU  - Mitrović, Petar
AU  - Pavlović, Stefan
AU  - Marinković, Dalibor
AU  - Nježić, Zvonko
AU  - Stamenković, Olivera
AU  - Veljković, Vlada B.
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3809
AB  - Tehničko rešenje pripada oblasti hemijske tehnologije i predstavlja
tehnološki postupak za sintezu metil estara masnih kiselina (MEMK) iz ulja
kukuruznih klica (UKK) primenom pepela dobijenog sagorevanjem kurdeljke
kukuruza kao katalizatora.
PB  - Univerzitet u Nišu -Tehnloški fakultet u Leskovcu
T1  - Novi tehnološki postupak dobijanja biodizela metanolizom ulja kukuruznih klica u prisustvu pepela kukuruzne kurdeljke kao katalizatora
UR  - https://hdl.handle.net/21.15107/rcub_cer_3809
ER  - 

@misc{
author = "Kostić, Milan and Đalović, Ivica and Mitrović, Petar and Pavlović, Stefan and Marinković, Dalibor and Nježić, Zvonko and Stamenković, Olivera and Veljković, Vlada B.",
year = "2019",
abstract = "Tehničko rešenje pripada oblasti hemijske tehnologije i predstavlja
tehnološki postupak za sintezu metil estara masnih kiselina (MEMK) iz ulja
kukuruznih klica (UKK) primenom pepela dobijenog sagorevanjem kurdeljke
kukuruza kao katalizatora.",
publisher = "Univerzitet u Nišu -Tehnloški fakultet u Leskovcu",
title = "Novi tehnološki postupak dobijanja biodizela metanolizom ulja kukuruznih klica u prisustvu pepela kukuruzne kurdeljke kao katalizatora",
url = "https://hdl.handle.net/21.15107/rcub_cer_3809"
}

Kostić, M., Đalović, I., Mitrović, P., Pavlović, S., Marinković, D., Nježić, Z., Stamenković, O.,& Veljković, V. B.. (2019). Novi tehnološki postupak dobijanja biodizela metanolizom ulja kukuruznih klica u prisustvu pepela kukuruzne kurdeljke kao katalizatora. 
Univerzitet u Nišu -Tehnloški fakultet u Leskovcu..
https://hdl.handle.net/21.15107/rcub_cer_3809

Kostić M, Đalović I, Mitrović P, Pavlović S, Marinković D, Nježić Z, Stamenković O, Veljković VB. Novi tehnološki postupak dobijanja biodizela metanolizom ulja kukuruznih klica u prisustvu pepela kukuruzne kurdeljke kao katalizatora. 2019;.
https://hdl.handle.net/21.15107/rcub_cer_3809 .

Kostić, Milan, Đalović, Ivica, Mitrović, Petar, Pavlović, Stefan, Marinković, Dalibor, Nježić, Zvonko, Stamenković, Olivera, Veljković, Vlada B., "Novi tehnološki postupak dobijanja biodizela metanolizom ulja kukuruznih klica u prisustvu pepela kukuruzne kurdeljke kao katalizatora" (2019),
https://hdl.handle.net/21.15107/rcub_cer_3809 .

TY  - JOUR
AU  - Ilić, Slavica B.
AU  - Konstantinović, Sandra S.
AU  - Gojgić-Cvijović, Gordana
AU  - Veljković, Vlada B.
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3247
AB  - Influence of a modified media on Hexaene H-85 and Azalomycine B production by Streptomyces hygroscopicus CH-7 was investigated. The amino acid L-tryptophan, as a nitrogen source, was replaced with isatin-3-thiosemicarbazone and its complexes with some divalent metal ions. Isatin-3-thiosemicarbazone was synthesized in crude glycerol obtained as a byproduct in biodiesel production from sunflower oil. The complexes were charac-terized by elemental microanalysis and magnetic susceptibility, as well as, by Atomic absorption(AA), Fourier-transform infrared (FTIR) and Ultraviolet–visible (UV/VIS) spectro-scopic methods. The spectral studies indicated an octahedral geometry for the Mn(II), Fe(II) and Ni(II) complexes and a tetrahedral one for the Zn(II) complex. Comparing to the basal medium, isatin-3-thiosemicarbazone (ITC) and its metal complexes in the concentration of 0.5 g dm-3 showed better results in the antibiotics production. Use of medium supple-mented with the Fe(II) complex resulted in the maximum Hexaene H-85 and Azalomycine B concentrations of 306 μg cm-3 and 127 μg cm-3, respectively. Addition of ITC and its complexes changed the morphology of S. hygroscopicus CH-7 from filaments to pellets as a dominant shape in media resulting in higher antibiotic production.
AB  - У раду је испитиван утицај модификованих хранљивих подлога на производњу антибиотика Hexaene H-85 и Azalomycine B помоћу Streptomyces hygroscopicus CH-7. Аминокиселина L-триптофан, као извор азота, замењена је изатин-3-тиосемикарбазоном (синтетисаним у сировом глицеролу који се добија као нуспродукт у производњи биодизела из сунцокретовог уља) и његовим комплексима са неким двоалентним металним јонима. Комплекси су карактерисани елементарном микроанализом, магнетном сусцептибилнош-ћу, атомском аспорпцијом (A), инфрацрвеним (IR) и ултравиолетним (UV/VIS) спектроскопским методама. Спектралне анализе показале су октахедралну геометрију комплекса Мn(II), Fе(II) и Ni(II) и тетраедарску за комплекс Zn(II). Изатин-3-тиосемикарбазон и његови комплекси са металима (0,5 g dm-3) утичу на повећање продукције антибиотика у поређењу са основном подлогом. Највеће концентрације антибиотика Hexaene H-85 и Azalomycine B су остварене у хранљивој подлози са Fe(II) комплексом (306 и 127 μg cm-3, редом). Комплекси ИТС и изатин 3-тиосемикарбазон утичу и на морфологију тестираног соја. Streptomyces hygroscopicus CH-7 растe у облику филамената и пелета, у подлогама у којима је остварена највећа продукција антибиотика.
PB  - Association of the Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Antibiotic production by Streptomyces hygroscopicus CH-7 in medium containing Schiff base complexes
T1  - Продукција антибиотика помоћу Streptomyces hygroscopicus CH-7 у хранљивим подлогама са комплексима шифових базa
VL  - 73
IS  - 2
SP  - 93
EP  - 101
DO  - 10.2298/HEMIND181016008I
ER  - 

@article{
author = "Ilić, Slavica B. and Konstantinović, Sandra S. and Gojgić-Cvijović, Gordana and Veljković, Vlada B.",
year = "2019",
abstract = "Influence of a modified media on Hexaene H-85 and Azalomycine B production by Streptomyces hygroscopicus CH-7 was investigated. The amino acid L-tryptophan, as a nitrogen source, was replaced with isatin-3-thiosemicarbazone and its complexes with some divalent metal ions. Isatin-3-thiosemicarbazone was synthesized in crude glycerol obtained as a byproduct in biodiesel production from sunflower oil. The complexes were charac-terized by elemental microanalysis and magnetic susceptibility, as well as, by Atomic absorption(AA), Fourier-transform infrared (FTIR) and Ultraviolet–visible (UV/VIS) spectro-scopic methods. The spectral studies indicated an octahedral geometry for the Mn(II), Fe(II) and Ni(II) complexes and a tetrahedral one for the Zn(II) complex. Comparing to the basal medium, isatin-3-thiosemicarbazone (ITC) and its metal complexes in the concentration of 0.5 g dm-3 showed better results in the antibiotics production. Use of medium supple-mented with the Fe(II) complex resulted in the maximum Hexaene H-85 and Azalomycine B concentrations of 306 μg cm-3 and 127 μg cm-3, respectively. Addition of ITC and its complexes changed the morphology of S. hygroscopicus CH-7 from filaments to pellets as a dominant shape in media resulting in higher antibiotic production., У раду је испитиван утицај модификованих хранљивих подлога на производњу антибиотика Hexaene H-85 и Azalomycine B помоћу Streptomyces hygroscopicus CH-7. Аминокиселина L-триптофан, као извор азота, замењена је изатин-3-тиосемикарбазоном (синтетисаним у сировом глицеролу који се добија као нуспродукт у производњи биодизела из сунцокретовог уља) и његовим комплексима са неким двоалентним металним јонима. Комплекси су карактерисани елементарном микроанализом, магнетном сусцептибилнош-ћу, атомском аспорпцијом (A), инфрацрвеним (IR) и ултравиолетним (UV/VIS) спектроскопским методама. Спектралне анализе показале су октахедралну геометрију комплекса Мn(II), Fе(II) и Ni(II) и тетраедарску за комплекс Zn(II). Изатин-3-тиосемикарбазон и његови комплекси са металима (0,5 g dm-3) утичу на повећање продукције антибиотика у поређењу са основном подлогом. Највеће концентрације антибиотика Hexaene H-85 и Azalomycine B су остварене у хранљивој подлози са Fe(II) комплексом (306 и 127 μg cm-3, редом). Комплекси ИТС и изатин 3-тиосемикарбазон утичу и на морфологију тестираног соја. Streptomyces hygroscopicus CH-7 растe у облику филамената и пелета, у подлогама у којима је остварена највећа продукција антибиотика.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Antibiotic production by Streptomyces hygroscopicus CH-7 in medium containing Schiff base complexes, Продукција антибиотика помоћу Streptomyces hygroscopicus CH-7 у хранљивим подлогама са комплексима шифових базa",
volume = "73",
number = "2",
pages = "93-101",
doi = "10.2298/HEMIND181016008I"
}

Ilić, S. B., Konstantinović, S. S., Gojgić-Cvijović, G.,& Veljković, V. B.. (2019). Antibiotic production by Streptomyces hygroscopicus CH-7 in medium containing Schiff base complexes. in Hemijska industrija
Association of the Chemical Engineers of Serbia., 73(2), 93-101.
https://doi.org/10.2298/HEMIND181016008I

Ilić SB, Konstantinović SS, Gojgić-Cvijović G, Veljković VB. Antibiotic production by Streptomyces hygroscopicus CH-7 in medium containing Schiff base complexes. in Hemijska industrija. 2019;73(2):93-101.
doi:10.2298/HEMIND181016008I .

Ilić, Slavica B., Konstantinović, Sandra S., Gojgić-Cvijović, Gordana, Veljković, Vlada B., "Antibiotic production by Streptomyces hygroscopicus CH-7 in medium containing Schiff base complexes" in Hemijska industrija, 73, no. 2 (2019):93-101,
https://doi.org/10.2298/HEMIND181016008I . .

TY  - JOUR
AU  - Marinković, Dalibor
AU  - Miladinović, Marija R.
AU  - Avramović, Jelena M.
AU  - Krstić, Ivan
AU  - Stanković, Miroslav
AU  - Stamenković, Olivera
AU  - Jovanović, Dušan M.
AU  - Veljković, Vlada B.
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2301
AB  - Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 particles were conducted in batch stirred and packed-bed tubular reactors at 60 degrees C. The proposed three-parameter kinetic model describing the overall reaction with a variable mechanism was successfully applied to both batch and continuous reactions. The process optimization was done using the response surface methodology combined with a central composite design. The obtained optimal catalyst concentration, methanol-to-oil molar ratio and reaction time for the batch reaction were 0.55% (CaO to the oil), 9:1 and 5.22 h, respectively. In the continuous process, the catalyst was highly active stable and slightly leachable during 30 h. The deactivation of the catalyst was due to massive deposition of the organic molecules from the reaction mixture, which sheltered the catalytically active sites on the catalyst surface.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - Energy Conversion and Management
T1  - Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst
VL  - 163
SP  - 122
EP  - 133
DO  - 10.1016/j.enconman.2018.02.048
ER  - 

@article{
author = "Marinković, Dalibor and Miladinović, Marija R. and Avramović, Jelena M. and Krstić, Ivan and Stanković, Miroslav and Stamenković, Olivera and Jovanović, Dušan M. and Veljković, Vlada B.",
year = "2018",
abstract = "Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 particles were conducted in batch stirred and packed-bed tubular reactors at 60 degrees C. The proposed three-parameter kinetic model describing the overall reaction with a variable mechanism was successfully applied to both batch and continuous reactions. The process optimization was done using the response surface methodology combined with a central composite design. The obtained optimal catalyst concentration, methanol-to-oil molar ratio and reaction time for the batch reaction were 0.55% (CaO to the oil), 9:1 and 5.22 h, respectively. In the continuous process, the catalyst was highly active stable and slightly leachable during 30 h. The deactivation of the catalyst was due to massive deposition of the organic molecules from the reaction mixture, which sheltered the catalytically active sites on the catalyst surface.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "Energy Conversion and Management",
title = "Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst",
volume = "163",
pages = "122-133",
doi = "10.1016/j.enconman.2018.02.048"
}

Marinković, D., Miladinović, M. R., Avramović, J. M., Krstić, I., Stanković, M., Stamenković, O., Jovanović, D. M.,& Veljković, V. B.. (2018). Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst. in Energy Conversion and Management
Oxford : Pergamon-Elsevier Science Ltd., 163, 122-133.
https://doi.org/10.1016/j.enconman.2018.02.048

Marinković D, Miladinović MR, Avramović JM, Krstić I, Stanković M, Stamenković O, Jovanović DM, Veljković VB. Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst. in Energy Conversion and Management. 2018;163:122-133.
doi:10.1016/j.enconman.2018.02.048 .

Marinković, Dalibor, Miladinović, Marija R., Avramović, Jelena M., Krstić, Ivan, Stanković, Miroslav, Stamenković, Olivera, Jovanović, Dušan M., Veljković, Vlada B., "Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst" in Energy Conversion and Management, 163 (2018):122-133,
https://doi.org/10.1016/j.enconman.2018.02.048 . .

TY  - DATA
AU  - Marinković, Dalibor
AU  - Miladinović, Marija R.
AU  - Avramović, Jelena M.
AU  - Krstić, Ivan
AU  - Stanković, Miroslav
AU  - Stamenković, Olivera
AU  - Jovanović, Dušan M.
AU  - Veljković, Vlada B.
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4490
AB  - Supplementary material for: Marinković, D., Miladinovic, M. R., Avramović, J. M., Krstic, I. B., Stanković, M., Stamenković, O., Jovanović, D. M.,& Veljković, V. B. (2018). Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst. Energy Conversion and Management, 163, 122-133. https://doi.org/10.1016/j.enconman.2018.02.048
PB  - Elsevier
T2  - Energy Conversion and Management
T1  - Supplementary material for: "Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst"
UR  - https://hdl.handle.net/21.15107/rcub_cer_4490
ER  - 

@misc{
author = "Marinković, Dalibor and Miladinović, Marija R. and Avramović, Jelena M. and Krstić, Ivan and Stanković, Miroslav and Stamenković, Olivera and Jovanović, Dušan M. and Veljković, Vlada B.",
year = "2018",
abstract = "Supplementary material for: Marinković, D., Miladinovic, M. R., Avramović, J. M., Krstic, I. B., Stanković, M., Stamenković, O., Jovanović, D. M.,& Veljković, V. B. (2018). Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst. Energy Conversion and Management, 163, 122-133. https://doi.org/10.1016/j.enconman.2018.02.048",
publisher = "Elsevier",
journal = "Energy Conversion and Management",
title = "Supplementary material for: "Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst"",
url = "https://hdl.handle.net/21.15107/rcub_cer_4490"
}

Marinković, D., Miladinović, M. R., Avramović, J. M., Krstić, I., Stanković, M., Stamenković, O., Jovanović, D. M.,& Veljković, V. B.. (2018). Supplementary material for: "Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst". in Energy Conversion and Management
Elsevier..
https://hdl.handle.net/21.15107/rcub_cer_4490

Marinković D, Miladinović MR, Avramović JM, Krstić I, Stanković M, Stamenković O, Jovanović DM, Veljković VB. Supplementary material for: "Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst". in Energy Conversion and Management. 2018;.
https://hdl.handle.net/21.15107/rcub_cer_4490 .

Marinković, Dalibor, Miladinović, Marija R., Avramović, Jelena M., Krstić, Ivan, Stanković, Miroslav, Stamenković, Olivera, Jovanović, Dušan M., Veljković, Vlada B., "Supplementary material for: "Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst"" in Energy Conversion and Management (2018),
https://hdl.handle.net/21.15107/rcub_cer_4490 .

TY  - JOUR
AU  - Marinković, Dalibor
AU  - Avramović, Jelena M.
AU  - Stanković, Miroslav
AU  - Stamenković, Olivera
AU  - Jovanović, Dušan M.
AU  - Veljković, Vlada B.
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2255
AB  - Loading CaO onto spherically-shaped gamma-Al2O3 support was applied for the preparation of a cost-effective and environmentally-friendly heterogeneous catalyst for biodiesel production. Physico-chemical, textural and morphological characterization was performed using optical emission spectroscopy (ICP OES), Hg-porosimetry, N-2 physisorption, scanning electron microscopy (FESEM), X-ray diffraction (XRPD), Fourier transform infrared spectroscopy (ATR FTIR) and Hammett indicators. The effects of catalyst preparation conditions (different precursor salts and calcination temperatures) on the catalyst activity, and the reaction conditions (methanol-to-oil molar ratio and catalyst loading) on the reaction rate and esters yield were studied. In addition, catalyst stability was investigated. The most active catalyst was derived from the nitrate precursor after calcination at 475 degrees C (inert atmosphere). Under mild reaction conditions (60 degrees C, 5 h, 900 rpm, methanol-to-oil molar ratio of 12:1 and catalyst loading (CaO wt% to the oil) of 0.5%), the equilibrium ester content of 94.3% was obtained in the methanolysis of sunflower oil in a batch reactor. The catalyst remained sufficiently active in two consecutive cycles without any pretreatment. Mechanical erosion caused by stirring and massive deposition of organic molecules from the reaction mixture caused the decrease of catalytic activity while CaO leaching was negligible.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - Energy Conversion and Management
T1  - Synthesis and characterization of spherically-shaped CaO/gamma-Al2O3 catalyst and its application in biodiesel production
VL  - 144
SP  - 399
EP  - 413
DO  - 10.1016/j.enconman.2017.04.079
ER  - 

@article{
author = "Marinković, Dalibor and Avramović, Jelena M. and Stanković, Miroslav and Stamenković, Olivera and Jovanović, Dušan M. and Veljković, Vlada B.",
year = "2017",
abstract = "Loading CaO onto spherically-shaped gamma-Al2O3 support was applied for the preparation of a cost-effective and environmentally-friendly heterogeneous catalyst for biodiesel production. Physico-chemical, textural and morphological characterization was performed using optical emission spectroscopy (ICP OES), Hg-porosimetry, N-2 physisorption, scanning electron microscopy (FESEM), X-ray diffraction (XRPD), Fourier transform infrared spectroscopy (ATR FTIR) and Hammett indicators. The effects of catalyst preparation conditions (different precursor salts and calcination temperatures) on the catalyst activity, and the reaction conditions (methanol-to-oil molar ratio and catalyst loading) on the reaction rate and esters yield were studied. In addition, catalyst stability was investigated. The most active catalyst was derived from the nitrate precursor after calcination at 475 degrees C (inert atmosphere). Under mild reaction conditions (60 degrees C, 5 h, 900 rpm, methanol-to-oil molar ratio of 12:1 and catalyst loading (CaO wt% to the oil) of 0.5%), the equilibrium ester content of 94.3% was obtained in the methanolysis of sunflower oil in a batch reactor. The catalyst remained sufficiently active in two consecutive cycles without any pretreatment. Mechanical erosion caused by stirring and massive deposition of organic molecules from the reaction mixture caused the decrease of catalytic activity while CaO leaching was negligible.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "Energy Conversion and Management",
title = "Synthesis and characterization of spherically-shaped CaO/gamma-Al2O3 catalyst and its application in biodiesel production",
volume = "144",
pages = "399-413",
doi = "10.1016/j.enconman.2017.04.079"
}

Marinković, D., Avramović, J. M., Stanković, M., Stamenković, O., Jovanović, D. M.,& Veljković, V. B.. (2017). Synthesis and characterization of spherically-shaped CaO/gamma-Al2O3 catalyst and its application in biodiesel production. in Energy Conversion and Management
Oxford : Pergamon-Elsevier Science Ltd., 144, 399-413.
https://doi.org/10.1016/j.enconman.2017.04.079

Marinković D, Avramović JM, Stanković M, Stamenković O, Jovanović DM, Veljković VB. Synthesis and characterization of spherically-shaped CaO/gamma-Al2O3 catalyst and its application in biodiesel production. in Energy Conversion and Management. 2017;144:399-413.
doi:10.1016/j.enconman.2017.04.079 .

Marinković, Dalibor, Avramović, Jelena M., Stanković, Miroslav, Stamenković, Olivera, Jovanović, Dušan M., Veljković, Vlada B., "Synthesis and characterization of spherically-shaped CaO/gamma-Al2O3 catalyst and its application in biodiesel production" in Energy Conversion and Management, 144 (2017):399-413,
https://doi.org/10.1016/j.enconman.2017.04.079 . .

TY  - JOUR
AU  - Konstantinović, Sandra S.
AU  - Zlatkovic, Milica Z.
AU  - Ciric, Jovan T.
AU  - Ilić, Slavica B.
AU  - Gojgić-Cvijović, Gordana
AU  - Veljković, Vlada B.
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2102
AB  - In the present work, four derivatives of salicylaldehyde (salicylaldehyde-hydrazone, phenylhydrazone, semicarbazone and thiosemicarbazone) were synthesized using both conventional (95% ethanol) and green (crude glycerol from biodiesel production) solvents. The obtained compounds were identified by elemental microanalysis, as well as FTIR, UV/Vis and H-1-NMR spectroscopic methods. Yields of 93-98% of the compounds in crude glycerol were achieved within 10-25 min. The derivatives of salicylaldehyde and crude glycerol were used as a nitrogen and carbon source, respectively, in the medium for antibiotic (hexaene H-85 and azalomycine B) production by Streptomyces hygroscopicus CH-7. The highest concentrations of hexaene H-85 and azalomycine B were achieved in the medium containing salicylaldehyde-thiosemicarbazone (198 and 69 mu g/cm(3), respectively). Derivatives of salicylaldehyde also impacted the strain morphology. In the media with salicylaldehyde- phenylhydrazone and salicylaldehyde-thiosemicarbazone, S. hygroscopicus CH-7 grew like large dispersive pellets with long twisted filaments that produced the highest yield of the antibiotics.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - The use of salicylaldehyde derivatives as a nitrogen source for antibiotic production by Streptomyces hygroscopicus CH-7
VL  - 71
IS  - 6
SP  - 487
EP  - 494
DO  - 10.2298/HEMIND170124011K
ER  - 

@article{
author = "Konstantinović, Sandra S. and Zlatkovic, Milica Z. and Ciric, Jovan T. and Ilić, Slavica B. and Gojgić-Cvijović, Gordana and Veljković, Vlada B.",
year = "2017",
abstract = "In the present work, four derivatives of salicylaldehyde (salicylaldehyde-hydrazone, phenylhydrazone, semicarbazone and thiosemicarbazone) were synthesized using both conventional (95% ethanol) and green (crude glycerol from biodiesel production) solvents. The obtained compounds were identified by elemental microanalysis, as well as FTIR, UV/Vis and H-1-NMR spectroscopic methods. Yields of 93-98% of the compounds in crude glycerol were achieved within 10-25 min. The derivatives of salicylaldehyde and crude glycerol were used as a nitrogen and carbon source, respectively, in the medium for antibiotic (hexaene H-85 and azalomycine B) production by Streptomyces hygroscopicus CH-7. The highest concentrations of hexaene H-85 and azalomycine B were achieved in the medium containing salicylaldehyde-thiosemicarbazone (198 and 69 mu g/cm(3), respectively). Derivatives of salicylaldehyde also impacted the strain morphology. In the media with salicylaldehyde- phenylhydrazone and salicylaldehyde-thiosemicarbazone, S. hygroscopicus CH-7 grew like large dispersive pellets with long twisted filaments that produced the highest yield of the antibiotics.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "The use of salicylaldehyde derivatives as a nitrogen source for antibiotic production by Streptomyces hygroscopicus CH-7",
volume = "71",
number = "6",
pages = "487-494",
doi = "10.2298/HEMIND170124011K"
}

Konstantinović, S. S., Zlatkovic, M. Z., Ciric, J. T., Ilić, S. B., Gojgić-Cvijović, G.,& Veljković, V. B.. (2017). The use of salicylaldehyde derivatives as a nitrogen source for antibiotic production by Streptomyces hygroscopicus CH-7. in Hemijska industrija
Association of Chemical Engineers of Serbia., 71(6), 487-494.
https://doi.org/10.2298/HEMIND170124011K

Konstantinović SS, Zlatkovic MZ, Ciric JT, Ilić SB, Gojgić-Cvijović G, Veljković VB. The use of salicylaldehyde derivatives as a nitrogen source for antibiotic production by Streptomyces hygroscopicus CH-7. in Hemijska industrija. 2017;71(6):487-494.
doi:10.2298/HEMIND170124011K .

Konstantinović, Sandra S., Zlatkovic, Milica Z., Ciric, Jovan T., Ilić, Slavica B., Gojgić-Cvijović, Gordana, Veljković, Vlada B., "The use of salicylaldehyde derivatives as a nitrogen source for antibiotic production by Streptomyces hygroscopicus CH-7" in Hemijska industrija, 71, no. 6 (2017):487-494,
https://doi.org/10.2298/HEMIND170124011K . .

TY  - JOUR
AU  - Miladinović, Marija R.
AU  - Stamenković, Olivera
AU  - Banković, Predrag
AU  - Milutinović Nikolić, Aleksandra
AU  - Jovanović, Dušan M.
AU  - Veljković, Vlada B.
PY  - 2016
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1949
AB  - The effect of the residence time (i.e. liquid flow rate through the reactor), methanol-to-oil molar ratio and reaction temperature on the fatty acid methyl esters (FAMEs) content at the output of a continuous packed bed tubular reactor was modeled by the response surface methodology (RSM) combined with the 3(3) full factorial design (FFD) with replication or the Box-Behnken design (BBD) with five center points. The methanolysis of sunflower oil was carried out at the residence time of 1.0, 1.5 and 2.0 h, the methanol-to-oil molar ratios of 6:1, 12:1 and 18:1 and the reaction temperature of 40, 50 and 60 degrees C under the atmospheric pressure. Based on the used experimental designs, the model equations containing only linear and two-factor interaction terms were developed for predicting the FAME content, which were validated through the use of the unseen data. Applying the analysis of variance (ANOVA), all three factors were shown to have a significant influence on the FAME content. Acceptable statistical predictability and accuracy resulted from both designs since the values of the coefficient of determination were close to unity while the values of the mean relative percentage deviation were relatively low ( LT +/- 10%). In addition, both designs predicted the maximum FAME content of above 99%, which agreed closely with the actual FAME content (98.8%). The same optimal reaction temperature (60 degrees C) and residence time (2.0 h) were determined by both designs while the BBD model suggested a slightly lower methanol-to oil molar ratio (12.2:1) than the 3(3) FFD model (12.8:1). Since the BBD realization involved three times smaller number of experimental runs, thus requiring lower costs, less labor and shorter time than the 33 FFD, it could be recommended for the optimization of biodiesel production processes.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - Energy Conversion and Management
T1  - Modeling and optimization of sunflower oil methanolysis over quicklime bits in a packed bed tubular reactor using the response surface methodology
VL  - 130
SP  - 25
EP  - 33
DO  - 10.1016/j.enconman.2016.10.020
ER  - 

@article{
author = "Miladinović, Marija R. and Stamenković, Olivera and Banković, Predrag and Milutinović Nikolić, Aleksandra and Jovanović, Dušan M. and Veljković, Vlada B.",
year = "2016",
abstract = "The effect of the residence time (i.e. liquid flow rate through the reactor), methanol-to-oil molar ratio and reaction temperature on the fatty acid methyl esters (FAMEs) content at the output of a continuous packed bed tubular reactor was modeled by the response surface methodology (RSM) combined with the 3(3) full factorial design (FFD) with replication or the Box-Behnken design (BBD) with five center points. The methanolysis of sunflower oil was carried out at the residence time of 1.0, 1.5 and 2.0 h, the methanol-to-oil molar ratios of 6:1, 12:1 and 18:1 and the reaction temperature of 40, 50 and 60 degrees C under the atmospheric pressure. Based on the used experimental designs, the model equations containing only linear and two-factor interaction terms were developed for predicting the FAME content, which were validated through the use of the unseen data. Applying the analysis of variance (ANOVA), all three factors were shown to have a significant influence on the FAME content. Acceptable statistical predictability and accuracy resulted from both designs since the values of the coefficient of determination were close to unity while the values of the mean relative percentage deviation were relatively low ( LT +/- 10%). In addition, both designs predicted the maximum FAME content of above 99%, which agreed closely with the actual FAME content (98.8%). The same optimal reaction temperature (60 degrees C) and residence time (2.0 h) were determined by both designs while the BBD model suggested a slightly lower methanol-to oil molar ratio (12.2:1) than the 3(3) FFD model (12.8:1). Since the BBD realization involved three times smaller number of experimental runs, thus requiring lower costs, less labor and shorter time than the 33 FFD, it could be recommended for the optimization of biodiesel production processes.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "Energy Conversion and Management",
title = "Modeling and optimization of sunflower oil methanolysis over quicklime bits in a packed bed tubular reactor using the response surface methodology",
volume = "130",
pages = "25-33",
doi = "10.1016/j.enconman.2016.10.020"
}

Miladinović, M. R., Stamenković, O., Banković, P., Milutinović Nikolić, A., Jovanović, D. M.,& Veljković, V. B.. (2016). Modeling and optimization of sunflower oil methanolysis over quicklime bits in a packed bed tubular reactor using the response surface methodology. in Energy Conversion and Management
Oxford : Pergamon-Elsevier Science Ltd., 130, 25-33.
https://doi.org/10.1016/j.enconman.2016.10.020

Miladinović MR, Stamenković O, Banković P, Milutinović Nikolić A, Jovanović DM, Veljković VB. Modeling and optimization of sunflower oil methanolysis over quicklime bits in a packed bed tubular reactor using the response surface methodology. in Energy Conversion and Management. 2016;130:25-33.
doi:10.1016/j.enconman.2016.10.020 .

Miladinović, Marija R., Stamenković, Olivera, Banković, Predrag, Milutinović Nikolić, Aleksandra, Jovanović, Dušan M., Veljković, Vlada B., "Modeling and optimization of sunflower oil methanolysis over quicklime bits in a packed bed tubular reactor using the response surface methodology" in Energy Conversion and Management, 130 (2016):25-33,
https://doi.org/10.1016/j.enconman.2016.10.020 . .

TY  - JOUR
AU  - Marinković, Dalibor
AU  - Stanković, Miroslav
AU  - Velickovic, Ana V
AU  - Avramović, Jelena M.
AU  - Miladinović, Marija R.
AU  - Stamenković, Olivera
AU  - Veljković, Vlada B.
AU  - Jovanović, Dušan M.
PY  - 2016
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1956
AB  - The present paper is an overview of the recent progress in the development of various CaO-based catalysts suitable for biodiesel production. The mechanism, kinetics and optimization of transesterification reaction over these catalysts are first considered. Then, the practical application of CaO-based catalysts is discussed with a special stress on leaching and reusability of these catalysts. Also, various continuous reactor systems currently in use for biodiesel production are appraised. In addition to it, purification of crude biodiesel and the ecological aspects of using CaO-based catalysts are considered. Finally, the potentials of CaO-based catalysts for heterogeneous catalysis for biodiesel production are emphasized to assess the future perspectives of their use. This review might help in selecting suitable CaO-based catalysts and the optimum reaction conditions for biodiesel production.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - Renewable & Sustainable Energy Reviews
T1  - Calcium oxide as a promising heterogeneous catalyst for biodiesel production: Current state and perspectives
VL  - 56
SP  - 1387
EP  - 1408
DO  - 10.1016/j.rser.2015.12.007
ER  - 

@article{
author = "Marinković, Dalibor and Stanković, Miroslav and Velickovic, Ana V and Avramović, Jelena M. and Miladinović, Marija R. and Stamenković, Olivera and Veljković, Vlada B. and Jovanović, Dušan M.",
year = "2016",
abstract = "The present paper is an overview of the recent progress in the development of various CaO-based catalysts suitable for biodiesel production. The mechanism, kinetics and optimization of transesterification reaction over these catalysts are first considered. Then, the practical application of CaO-based catalysts is discussed with a special stress on leaching and reusability of these catalysts. Also, various continuous reactor systems currently in use for biodiesel production are appraised. In addition to it, purification of crude biodiesel and the ecological aspects of using CaO-based catalysts are considered. Finally, the potentials of CaO-based catalysts for heterogeneous catalysis for biodiesel production are emphasized to assess the future perspectives of their use. This review might help in selecting suitable CaO-based catalysts and the optimum reaction conditions for biodiesel production.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "Renewable & Sustainable Energy Reviews",
title = "Calcium oxide as a promising heterogeneous catalyst for biodiesel production: Current state and perspectives",
volume = "56",
pages = "1387-1408",
doi = "10.1016/j.rser.2015.12.007"
}

Marinković, D., Stanković, M., Velickovic, A. V., Avramović, J. M., Miladinović, M. R., Stamenković, O., Veljković, V. B.,& Jovanović, D. M.. (2016). Calcium oxide as a promising heterogeneous catalyst for biodiesel production: Current state and perspectives. in Renewable & Sustainable Energy Reviews
Oxford : Pergamon-Elsevier Science Ltd., 56, 1387-1408.
https://doi.org/10.1016/j.rser.2015.12.007

Marinković D, Stanković M, Velickovic AV, Avramović JM, Miladinović MR, Stamenković O, Veljković VB, Jovanović DM. Calcium oxide as a promising heterogeneous catalyst for biodiesel production: Current state and perspectives. in Renewable & Sustainable Energy Reviews. 2016;56:1387-1408.
doi:10.1016/j.rser.2015.12.007 .

Marinković, Dalibor, Stanković, Miroslav, Velickovic, Ana V, Avramović, Jelena M., Miladinović, Marija R., Stamenković, Olivera, Veljković, Vlada B., Jovanović, Dušan M., "Calcium oxide as a promising heterogeneous catalyst for biodiesel production: Current state and perspectives" in Renewable & Sustainable Energy Reviews, 56 (2016):1387-1408,
https://doi.org/10.1016/j.rser.2015.12.007 . .

TY  - JOUR
AU  - Ilić, Slavica B.
AU  - Konstantinović, Sandra S.
AU  - Ćirić, Jovan
AU  - Savić, Dragiša
AU  - Gojgić-Cvijović, Gordana
AU  - Veljković, Vlada B.
PY  - 2016
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1994
AB  - The microorganisam Streptomyces hygroscopicus CH-7 produces antibiotics Hexaene, Nigericine and Elaiophyline. The yield of antibiotics can be increased by changing the fermentation conditions and the composition of the nutrient medium. Based on the previous research with this strain and the literature reviewed, the aim of this work was to study the possibility of using waste materials (whey with proteins in varying ammounts and crude glycerol from the biodiesel production) as a carbon and nitrogen source in order to increase the yeald of antibiotics produced by Streptomyces hygroscopicus CH-7. The maximum concentration of Hexaene (47,2 μg/ cm3) was achieved in the medium with whey containing 80% of protein and glycerol from sunflower oil, while the maximum concentration of Elaiophyline (24,3μg/cm3) was achived in the basal medium.
AB  - Mikroorganizam Streptomyces hygroscopicus CH-7 produkuje antibiotike Heksaen, Nigericin i Elaiofilin. Promenom uslova fermentacije i sastava hranljive podloge može se povećati produkcija antibiotika. Na osnovu dosadašnjih istraživanja sa ovim sojem i literaturnog pregleda, cilj ovog rada je bio da se ispita mogućnost primene otpadnih sirovina (surutke sa različitim procentom proteina i sirovog glicerola iz proizvodnje biodizela) kao izvora ugljenika i azota, kako bi se povećala produkcija antibiotika pomoću Streptomyces hygroscopicus CH-7. Maksimalna koncentracija Heksaena (47,2 μg/cm 3) postignuta je na podlozi sa surutkom (koja sadrži 80% proteina) i glicerolom iz suncokretovog ulja, dok je maksimalna koncentracija Elaiofilina (24,3μg/cm3) ostvarena na osnovnoj podlozi.
PB  - Tehnološki fakultet, Leskovac
T2  - Advanced Technologies
T1  - Crude glycerol and whey as carbon and nitrogen sources for the production of antibiotics
T1  - Sirovi glicerol i surutka kao izvori ugljenika i azota za produkciju antibiotika
VL  - 5
IS  - 1
SP  - 5
EP  - 9
DO  - 10.5937/savteh1601005I
ER  - 

@article{
author = "Ilić, Slavica B. and Konstantinović, Sandra S. and Ćirić, Jovan and Savić, Dragiša and Gojgić-Cvijović, Gordana and Veljković, Vlada B.",
year = "2016",
abstract = "The microorganisam Streptomyces hygroscopicus CH-7 produces antibiotics Hexaene, Nigericine and Elaiophyline. The yield of antibiotics can be increased by changing the fermentation conditions and the composition of the nutrient medium. Based on the previous research with this strain and the literature reviewed, the aim of this work was to study the possibility of using waste materials (whey with proteins in varying ammounts and crude glycerol from the biodiesel production) as a carbon and nitrogen source in order to increase the yeald of antibiotics produced by Streptomyces hygroscopicus CH-7. The maximum concentration of Hexaene (47,2 μg/ cm3) was achieved in the medium with whey containing 80% of protein and glycerol from sunflower oil, while the maximum concentration of Elaiophyline (24,3μg/cm3) was achived in the basal medium., Mikroorganizam Streptomyces hygroscopicus CH-7 produkuje antibiotike Heksaen, Nigericin i Elaiofilin. Promenom uslova fermentacije i sastava hranljive podloge može se povećati produkcija antibiotika. Na osnovu dosadašnjih istraživanja sa ovim sojem i literaturnog pregleda, cilj ovog rada je bio da se ispita mogućnost primene otpadnih sirovina (surutke sa različitim procentom proteina i sirovog glicerola iz proizvodnje biodizela) kao izvora ugljenika i azota, kako bi se povećala produkcija antibiotika pomoću Streptomyces hygroscopicus CH-7. Maksimalna koncentracija Heksaena (47,2 μg/cm 3) postignuta je na podlozi sa surutkom (koja sadrži 80% proteina) i glicerolom iz suncokretovog ulja, dok je maksimalna koncentracija Elaiofilina (24,3μg/cm3) ostvarena na osnovnoj podlozi.",
publisher = "Tehnološki fakultet, Leskovac",
journal = "Advanced Technologies",
title = "Crude glycerol and whey as carbon and nitrogen sources for the production of antibiotics, Sirovi glicerol i surutka kao izvori ugljenika i azota za produkciju antibiotika",
volume = "5",
number = "1",
pages = "5-9",
doi = "10.5937/savteh1601005I"
}

Ilić, S. B., Konstantinović, S. S., Ćirić, J., Savić, D., Gojgić-Cvijović, G.,& Veljković, V. B.. (2016). Crude glycerol and whey as carbon and nitrogen sources for the production of antibiotics. in Advanced Technologies
Tehnološki fakultet, Leskovac., 5(1), 5-9.
https://doi.org/10.5937/savteh1601005I

Ilić SB, Konstantinović SS, Ćirić J, Savić D, Gojgić-Cvijović G, Veljković VB. Crude glycerol and whey as carbon and nitrogen sources for the production of antibiotics. in Advanced Technologies. 2016;5(1):5-9.
doi:10.5937/savteh1601005I .

Ilić, Slavica B., Konstantinović, Sandra S., Ćirić, Jovan, Savić, Dragiša, Gojgić-Cvijović, Gordana, Veljković, Vlada B., "Crude glycerol and whey as carbon and nitrogen sources for the production of antibiotics" in Advanced Technologies, 5, no. 1 (2016):5-9,
https://doi.org/10.5937/savteh1601005I . .

TY  - JOUR
AU  - Ciric, Jovan T
AU  - Konstantinović, Sandra S.
AU  - Ilić, Slavica B.
AU  - Gojgić-Cvijović, Gordana
AU  - Savic, Dragisa S
AU  - Veljković, Vlada B.
PY  - 2016
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2020
AB  - The effect of isatin derivatives as a nitrogen source on antibiotic (hexaene H-85 and azalomycine B) production by Streptomyces hygroscopicus CH-7 was studied. Isatin-3-hydrazone, 5-chloroisatin-3-hydrazone, isatin-3-tosylhydrazone, 5-chloroisatin-3-tosylhydrazone, isatin-3-(4-hidroxy) benzoilhydrazone and 5-chloroisatin-3-(4'-hidroxy) benzoylhydrazone were synthesized in a crude glycerol, obtained during the biodiesel production from edible sunflower oil. The highest concentration of Hexaene H-85 is achieved with 5-chloroisatin-3-hydrazone (197 mu g/cm(3)) in medium, while isatin-3-hydrazone has the greatest impact on azalomycine B production (72 mu g/cm(3)).
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - The impact of isatin derivatives on antibiotic production by Streptomyces hygroscopicus CH-7
VL  - 70
IS  - 2
SP  - 123
EP  - 128
DO  - 10.2298/HEMIND141127019C
ER  - 

@article{
author = "Ciric, Jovan T and Konstantinović, Sandra S. and Ilić, Slavica B. and Gojgić-Cvijović, Gordana and Savic, Dragisa S and Veljković, Vlada B.",
year = "2016",
abstract = "The effect of isatin derivatives as a nitrogen source on antibiotic (hexaene H-85 and azalomycine B) production by Streptomyces hygroscopicus CH-7 was studied. Isatin-3-hydrazone, 5-chloroisatin-3-hydrazone, isatin-3-tosylhydrazone, 5-chloroisatin-3-tosylhydrazone, isatin-3-(4-hidroxy) benzoilhydrazone and 5-chloroisatin-3-(4'-hidroxy) benzoylhydrazone were synthesized in a crude glycerol, obtained during the biodiesel production from edible sunflower oil. The highest concentration of Hexaene H-85 is achieved with 5-chloroisatin-3-hydrazone (197 mu g/cm(3)) in medium, while isatin-3-hydrazone has the greatest impact on azalomycine B production (72 mu g/cm(3)).",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "The impact of isatin derivatives on antibiotic production by Streptomyces hygroscopicus CH-7",
volume = "70",
number = "2",
pages = "123-128",
doi = "10.2298/HEMIND141127019C"
}

Ciric, J. T., Konstantinović, S. S., Ilić, S. B., Gojgić-Cvijović, G., Savic, D. S.,& Veljković, V. B.. (2016). The impact of isatin derivatives on antibiotic production by Streptomyces hygroscopicus CH-7. in Hemijska industrija
Association of Chemical Engineers of Serbia., 70(2), 123-128.
https://doi.org/10.2298/HEMIND141127019C

Ciric JT, Konstantinović SS, Ilić SB, Gojgić-Cvijović G, Savic DS, Veljković VB. The impact of isatin derivatives on antibiotic production by Streptomyces hygroscopicus CH-7. in Hemijska industrija. 2016;70(2):123-128.
doi:10.2298/HEMIND141127019C .

Ciric, Jovan T, Konstantinović, Sandra S., Ilić, Slavica B., Gojgić-Cvijović, Gordana, Savic, Dragisa S, Veljković, Vlada B., "The impact of isatin derivatives on antibiotic production by Streptomyces hygroscopicus CH-7" in Hemijska industrija, 70, no. 2 (2016):123-128,
https://doi.org/10.2298/HEMIND141127019C . .

TY  - JOUR
AU  - Marinković, Dalibor
AU  - Stanković, Miroslav
AU  - Veličković, Ana
AU  - Avramović, Jelena M.
AU  - Cakić, Milorad D.
AU  - Veljković, Vlada B.
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1774
AB  - Transesterification of sunflower oil was carried out over CaO loaded onto γ-Al2O3 as heterogeneous base catalysts. The solid base catalysts were syn­thesized by the modified wet impregnation of calcium acetate monohydrate onto neutral γ-Al2O3, calcined at different temperatures in an inert atmosphere and characterized by FESEM, XRPD and FTIR techniques. The catalyst con­taining 5.5 wt. % CaO supported on γ-Al2O3 calcined at 700°C exhibited the highest FAME yield at mild reaction conditions (60°C, atmospheric pressure, methanol-to-oil molar ratio of 9:1 and 0.51% of active species-CaO by weight of oil). The best CaO/γ-Al2O3 catalyst showed a similar or lower catalytic activity than some other CaO-based catalysts at a smaller amount of the catalyst (at least two times less than in other studies).
AB  - Transesterifikacija jestivog suncokretovog ulja izvršena je korišćenjem CaO nanešenog na γ-Al2O3 kao heterogenog baznog katalizatora. Katalizator je si-ntetisan korišćenjem modifikovane metode mokre impregnacije gde je kalcijum acetat monohidrat kao precursor nanešen na neutralnu γ-Al2O3. Karakterizacija katalizatora je urađena korišćenjem sledećih metoda: FESEM, XRPD i FTIR. Na katalitičku aktivnost, a samim tim i prinos metil estara masnih kiselina, utiču morfologija i sastav katalizatora pripremljenog kalcinacijom na različitim temperatu­rama. U reakciji transesterifikacije suncokretovog ulja pri umerenim reakcionim uslovima (60°C, molski odnos metanola:ulja 9:1 i količina CaO 0,51% u odnosu na masu ulja) katalitički najaktivniji je katalizator sa 5,5 mas. % CaO nanešenih na nosač i kalcinisan na 700°C. U poređenju sa literaturnim rezultatima drugih katalizatora baziranih na CaO, primenjenim u sličnim reakcionim uslovima CaO/ γ-Al2O3 je pokazao sličnu ili nižu katalitičku aktivnost. Razlog tome je zato što je u ovom radu korišćena najmanje dva puta manja količina katalizatora po eksperimentu u odnosu na istraživanja sa kojima je vršeno poređenje.
PB  - Tehnološki fakultet, Leskovac
T2  - Advanced Technologies
T1  - The synthesis of CaO loaded onto Al2O3 from calcium acetate and its application in transesterification of the sunflower oil
T1  - Sinteza CaO nanešenog na Al2O3 od prekursora kalcujum acetata i njegova primena u transesterifikaciji suncokretovog ulja
VL  - 4
IS  - 1
SP  - 26
EP  - 32
DO  - 10.5937/savteh1501026M
ER  - 

@article{
author = "Marinković, Dalibor and Stanković, Miroslav and Veličković, Ana and Avramović, Jelena M. and Cakić, Milorad D. and Veljković, Vlada B.",
year = "2015",
abstract = "Transesterification of sunflower oil was carried out over CaO loaded onto γ-Al2O3 as heterogeneous base catalysts. The solid base catalysts were syn­thesized by the modified wet impregnation of calcium acetate monohydrate onto neutral γ-Al2O3, calcined at different temperatures in an inert atmosphere and characterized by FESEM, XRPD and FTIR techniques. The catalyst con­taining 5.5 wt. % CaO supported on γ-Al2O3 calcined at 700°C exhibited the highest FAME yield at mild reaction conditions (60°C, atmospheric pressure, methanol-to-oil molar ratio of 9:1 and 0.51% of active species-CaO by weight of oil). The best CaO/γ-Al2O3 catalyst showed a similar or lower catalytic activity than some other CaO-based catalysts at a smaller amount of the catalyst (at least two times less than in other studies)., Transesterifikacija jestivog suncokretovog ulja izvršena je korišćenjem CaO nanešenog na γ-Al2O3 kao heterogenog baznog katalizatora. Katalizator je si-ntetisan korišćenjem modifikovane metode mokre impregnacije gde je kalcijum acetat monohidrat kao precursor nanešen na neutralnu γ-Al2O3. Karakterizacija katalizatora je urađena korišćenjem sledećih metoda: FESEM, XRPD i FTIR. Na katalitičku aktivnost, a samim tim i prinos metil estara masnih kiselina, utiču morfologija i sastav katalizatora pripremljenog kalcinacijom na različitim temperatu­rama. U reakciji transesterifikacije suncokretovog ulja pri umerenim reakcionim uslovima (60°C, molski odnos metanola:ulja 9:1 i količina CaO 0,51% u odnosu na masu ulja) katalitički najaktivniji je katalizator sa 5,5 mas. % CaO nanešenih na nosač i kalcinisan na 700°C. U poređenju sa literaturnim rezultatima drugih katalizatora baziranih na CaO, primenjenim u sličnim reakcionim uslovima CaO/ γ-Al2O3 je pokazao sličnu ili nižu katalitičku aktivnost. Razlog tome je zato što je u ovom radu korišćena najmanje dva puta manja količina katalizatora po eksperimentu u odnosu na istraživanja sa kojima je vršeno poređenje.",
publisher = "Tehnološki fakultet, Leskovac",
journal = "Advanced Technologies",
title = "The synthesis of CaO loaded onto Al2O3 from calcium acetate and its application in transesterification of the sunflower oil, Sinteza CaO nanešenog na Al2O3 od prekursora kalcujum acetata i njegova primena u transesterifikaciji suncokretovog ulja",
volume = "4",
number = "1",
pages = "26-32",
doi = "10.5937/savteh1501026M"
}

Marinković, D., Stanković, M., Veličković, A., Avramović, J. M., Cakić, M. D.,& Veljković, V. B.. (2015). The synthesis of CaO loaded onto Al2O3 from calcium acetate and its application in transesterification of the sunflower oil. in Advanced Technologies
Tehnološki fakultet, Leskovac., 4(1), 26-32.
https://doi.org/10.5937/savteh1501026M

Marinković D, Stanković M, Veličković A, Avramović JM, Cakić MD, Veljković VB. The synthesis of CaO loaded onto Al2O3 from calcium acetate and its application in transesterification of the sunflower oil. in Advanced Technologies. 2015;4(1):26-32.
doi:10.5937/savteh1501026M .

Marinković, Dalibor, Stanković, Miroslav, Veličković, Ana, Avramović, Jelena M., Cakić, Milorad D., Veljković, Vlada B., "The synthesis of CaO loaded onto Al2O3 from calcium acetate and its application in transesterification of the sunflower oil" in Advanced Technologies, 4, no. 1 (2015):26-32,
https://doi.org/10.5937/savteh1501026M . .

TY  - JOUR
AU  - Ilić, Slavica B.
AU  - Konstantinović, Sandra S.
AU  - Gojgić-Cvijović, Gordana
AU  - Savić, Dragiša S.
AU  - Veljković, Vlada B.
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1656
AB  - A media consisting of isatin-Schiff bases and its inclusion complexes with beta-cyclodextrine was developed to maximize the production of antibiotics Hexaene H-85 and azalomycine B by Streptomyces hygroscopicus CH-7. The media With (-cyclodextrine inclusion complex of isatin-3-thiosemicarbazone resulted in the maximum antibiotics concentration of 493 ìg/cm3 for Hexaene H-85 and 191 ìg/cm3 for azalomycine B. The production of hexaene H-85 and azalomycine is higher when (-cyclodextrine complex is added as a nitrogen source, comparing to pure isatin-Schiff base. The maximum concentration of hexaene H-85 in medium with inclusion complex of isatin-Schiff base is 1.4-2.3 times higher than the basal medium. The maximum production of azalomycine is 2.1-3.4 times higher in media with inclusion complex of Schiff base. During the fermentation process, the nutrient media with (-cyclodextrine inclusion complexes with isatin-Schiff bases affect the strain morphology, since it is in the form of compact pellets, which are formed from short and long, branched filaments.
AB  - Streptomyces hygroscopicus je soj poznat po produkciji različitih vrsta antibiotika i komercijalno važnih sekundarnih metabolita. Formiranje metabolita je rezultat mikrobioloških procesa u toku fermentacije i zavisi od nivoa biomase mikroorganizma, morfološkog profila kulture, kao i od ekoloških uslova. U cilju povećanja prinosa antibiotika, osnovna hranljiva podloga je redefinisana izmenom izvora azota, tako što su umesto sojinog brašna (10 g/dm3) dodati kompleksi Šifovih baza sa (-ciklodekstrinom (10 g/dm3). Dodatak kompleksa Šifovih baza sa bciklodekstrinom rezultirao je znatno povećanje koncentracije oba antibiotika. Maksimalna koncentracija heksaena H-85 je ostvarena na podlozi sa kompleksom izatin-3-tiosemikarbazona sa (-ciklodekstrinom i iznosila je 493 ìg/cm3, dok je za azalomicin B iznosila 191 ìg/cm3. Povećanje maksimalnih koncentracija antibiotika na podlogama sa kompleksima Schiff-ovih baza je iznosilo 1,4-2,3 puta za heksaen H-85, odnosno 2,1-3,4 puta za azalomicin B, u odnosu na osnovnu podlogu. U toku procesa fermentacije na hranljivim podlogama sa kompleksima Šifovih baza sa (-ciklodekstrinom, soj raste u obliku kompaktnih peleta, koji se formiraju od kratkih i dugih, razgranatih filamenata.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - The influence of Schiff base inclusion complexes with beta-cyclodextrine on antibiotic production by Streptomyces hygroscopicus CH-7
T1  - Uticaj kompleksa Šifovih baza sa beta-ciklodekstrinom na produkciju antibiotika pomoću Streptomyces hygroscopicus CH-7
VL  - 69
IS  - 1
SP  - 9
EP  - 15
DO  - 10.2298/HEMIND131113012I
ER  - 

@article{
author = "Ilić, Slavica B. and Konstantinović, Sandra S. and Gojgić-Cvijović, Gordana and Savić, Dragiša S. and Veljković, Vlada B.",
year = "2015",
abstract = "A media consisting of isatin-Schiff bases and its inclusion complexes with beta-cyclodextrine was developed to maximize the production of antibiotics Hexaene H-85 and azalomycine B by Streptomyces hygroscopicus CH-7. The media With (-cyclodextrine inclusion complex of isatin-3-thiosemicarbazone resulted in the maximum antibiotics concentration of 493 ìg/cm3 for Hexaene H-85 and 191 ìg/cm3 for azalomycine B. The production of hexaene H-85 and azalomycine is higher when (-cyclodextrine complex is added as a nitrogen source, comparing to pure isatin-Schiff base. The maximum concentration of hexaene H-85 in medium with inclusion complex of isatin-Schiff base is 1.4-2.3 times higher than the basal medium. The maximum production of azalomycine is 2.1-3.4 times higher in media with inclusion complex of Schiff base. During the fermentation process, the nutrient media with (-cyclodextrine inclusion complexes with isatin-Schiff bases affect the strain morphology, since it is in the form of compact pellets, which are formed from short and long, branched filaments., Streptomyces hygroscopicus je soj poznat po produkciji različitih vrsta antibiotika i komercijalno važnih sekundarnih metabolita. Formiranje metabolita je rezultat mikrobioloških procesa u toku fermentacije i zavisi od nivoa biomase mikroorganizma, morfološkog profila kulture, kao i od ekoloških uslova. U cilju povećanja prinosa antibiotika, osnovna hranljiva podloga je redefinisana izmenom izvora azota, tako što su umesto sojinog brašna (10 g/dm3) dodati kompleksi Šifovih baza sa (-ciklodekstrinom (10 g/dm3). Dodatak kompleksa Šifovih baza sa bciklodekstrinom rezultirao je znatno povećanje koncentracije oba antibiotika. Maksimalna koncentracija heksaena H-85 je ostvarena na podlozi sa kompleksom izatin-3-tiosemikarbazona sa (-ciklodekstrinom i iznosila je 493 ìg/cm3, dok je za azalomicin B iznosila 191 ìg/cm3. Povećanje maksimalnih koncentracija antibiotika na podlogama sa kompleksima Schiff-ovih baza je iznosilo 1,4-2,3 puta za heksaen H-85, odnosno 2,1-3,4 puta za azalomicin B, u odnosu na osnovnu podlogu. U toku procesa fermentacije na hranljivim podlogama sa kompleksima Šifovih baza sa (-ciklodekstrinom, soj raste u obliku kompaktnih peleta, koji se formiraju od kratkih i dugih, razgranatih filamenata.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "The influence of Schiff base inclusion complexes with beta-cyclodextrine on antibiotic production by Streptomyces hygroscopicus CH-7, Uticaj kompleksa Šifovih baza sa beta-ciklodekstrinom na produkciju antibiotika pomoću Streptomyces hygroscopicus CH-7",
volume = "69",
number = "1",
pages = "9-15",
doi = "10.2298/HEMIND131113012I"
}

Ilić, S. B., Konstantinović, S. S., Gojgić-Cvijović, G., Savić, D. S.,& Veljković, V. B.. (2015). The influence of Schiff base inclusion complexes with beta-cyclodextrine on antibiotic production by Streptomyces hygroscopicus CH-7. in Hemijska industrija
Association of Chemical Engineers of Serbia., 69(1), 9-15.
https://doi.org/10.2298/HEMIND131113012I

Ilić SB, Konstantinović SS, Gojgić-Cvijović G, Savić DS, Veljković VB. The influence of Schiff base inclusion complexes with beta-cyclodextrine on antibiotic production by Streptomyces hygroscopicus CH-7. in Hemijska industrija. 2015;69(1):9-15.
doi:10.2298/HEMIND131113012I .

Ilić, Slavica B., Konstantinović, Sandra S., Gojgić-Cvijović, Gordana, Savić, Dragiša S., Veljković, Vlada B., "The influence of Schiff base inclusion complexes with beta-cyclodextrine on antibiotic production by Streptomyces hygroscopicus CH-7" in Hemijska industrija, 69, no. 1 (2015):9-15,
https://doi.org/10.2298/HEMIND131113012I . .

TY  - JOUR
AU  - Miladinović, Marija R
AU  - Krstić, Jugoslav
AU  - Tasic, Marija B
AU  - Stamenković, Olivera
AU  - Veljković, Vlada B.
PY  - 2014
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1438
AB  - The quicklime-catalyzed sunflower oil methanolysis was studied at mild reaction conditions. Quicklime (calcined at 550 degrees C for 4h) in amounts of 1.0, 2.5, 5.0 and 10.0% (based on the oil weight) and different molar ratios of methanol-to-oil (6:1, 12:1 and 18:1) were employed to investigate their influence on the methyl esters content and the kinetics of the methanolysis reaction. The optimal methanol-to-oil molar ratio and quicklime amount for achieving the highest fatty acid methyl esters content were established to be 12:1 and 5% (based on the oil weight), respectively. The sigmoidal kinetics of quicklime-catalyzed methanolysis reaction was described by a model which included the changing mechanism of the reaction and the triacylglycerols mass transfer limitation. The kinetic parameters were determined and correlated with the process variables. A good agreement between the kinetic model and the experimental data for all applied reaction conditions was observed.
PB  - Inst Chemical Engineers, Rugby
T2  - Chemical Engineering Research & Design
T1  - A kinetic study of quicklime-catalyzed sunflower oil methanolysis
VL  - 92
IS  - 9
SP  - 1740
EP  - 1752
DO  - 10.1016/j.cherd.2013.11.023
ER  - 

@article{
author = "Miladinović, Marija R and Krstić, Jugoslav and Tasic, Marija B and Stamenković, Olivera and Veljković, Vlada B.",
year = "2014",
abstract = "The quicklime-catalyzed sunflower oil methanolysis was studied at mild reaction conditions. Quicklime (calcined at 550 degrees C for 4h) in amounts of 1.0, 2.5, 5.0 and 10.0% (based on the oil weight) and different molar ratios of methanol-to-oil (6:1, 12:1 and 18:1) were employed to investigate their influence on the methyl esters content and the kinetics of the methanolysis reaction. The optimal methanol-to-oil molar ratio and quicklime amount for achieving the highest fatty acid methyl esters content were established to be 12:1 and 5% (based on the oil weight), respectively. The sigmoidal kinetics of quicklime-catalyzed methanolysis reaction was described by a model which included the changing mechanism of the reaction and the triacylglycerols mass transfer limitation. The kinetic parameters were determined and correlated with the process variables. A good agreement between the kinetic model and the experimental data for all applied reaction conditions was observed.",
publisher = "Inst Chemical Engineers, Rugby",
journal = "Chemical Engineering Research & Design",
title = "A kinetic study of quicklime-catalyzed sunflower oil methanolysis",
volume = "92",
number = "9",
pages = "1740-1752",
doi = "10.1016/j.cherd.2013.11.023"
}

Miladinović, M. R., Krstić, J., Tasic, M. B., Stamenković, O.,& Veljković, V. B.. (2014). A kinetic study of quicklime-catalyzed sunflower oil methanolysis. in Chemical Engineering Research & Design
Inst Chemical Engineers, Rugby., 92(9), 1740-1752.
https://doi.org/10.1016/j.cherd.2013.11.023

Miladinović MR, Krstić J, Tasic MB, Stamenković O, Veljković VB. A kinetic study of quicklime-catalyzed sunflower oil methanolysis. in Chemical Engineering Research & Design. 2014;92(9):1740-1752.
doi:10.1016/j.cherd.2013.11.023 .

Miladinović, Marija R, Krstić, Jugoslav, Tasic, Marija B, Stamenković, Olivera, Veljković, Vlada B., "A kinetic study of quicklime-catalyzed sunflower oil methanolysis" in Chemical Engineering Research & Design, 92, no. 9 (2014):1740-1752,
https://doi.org/10.1016/j.cherd.2013.11.023 . .

TY  - GEN
AU  - Popović, Zoran
AU  - Marinković, Dalibor
AU  - Nešić, Gordana
AU  - Veljković, Vlada B.
AU  - Stamenković, Olivera
PY  - 2014
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3753
AB  - Tехничко решење дефинише континуални поступак добијања FAME на бази уља
сунцокрета применом комерцијалног негашеног креча као катализатора у реактору са
непокретним слојем катализатора и раздвајање метилестарске и метанолно-глицеролне фазе
у гравитационом сепаратору.
PB  - Univerzitet u Beogradu, Naučna ustanova, Institut za hemiju, tehnologiju i metalurgiju
T1  - Prethodna studija opravdanosti sa generalnim projektom procesa i postrojenja - Poluindustrijsko postrojenje za sintezu biodizela iz suncokretovog ulja i metanola u koloni sa pakovanim slojem negašenog kreča kao katalizatorom
UR  - https://hdl.handle.net/21.15107/rcub_cer_3753
ER  - 

@misc{
author = "Popović, Zoran and Marinković, Dalibor and Nešić, Gordana and Veljković, Vlada B. and Stamenković, Olivera",
year = "2014",
abstract = "Tехничко решење дефинише континуални поступак добијања FAME на бази уља
сунцокрета применом комерцијалног негашеног креча као катализатора у реактору са
непокретним слојем катализатора и раздвајање метилестарске и метанолно-глицеролне фазе
у гравитационом сепаратору.",
publisher = "Univerzitet u Beogradu, Naučna ustanova, Institut za hemiju, tehnologiju i metalurgiju",
title = "Prethodna studija opravdanosti sa generalnim projektom procesa i postrojenja - Poluindustrijsko postrojenje za sintezu biodizela iz suncokretovog ulja i metanola u koloni sa pakovanim slojem negašenog kreča kao katalizatorom",
url = "https://hdl.handle.net/21.15107/rcub_cer_3753"
}

Popović, Z., Marinković, D., Nešić, G., Veljković, V. B.,& Stamenković, O.. (2014). Prethodna studija opravdanosti sa generalnim projektom procesa i postrojenja - Poluindustrijsko postrojenje za sintezu biodizela iz suncokretovog ulja i metanola u koloni sa pakovanim slojem negašenog kreča kao katalizatorom. 
Univerzitet u Beogradu, Naučna ustanova, Institut za hemiju, tehnologiju i metalurgiju..
https://hdl.handle.net/21.15107/rcub_cer_3753

Popović Z, Marinković D, Nešić G, Veljković VB, Stamenković O. Prethodna studija opravdanosti sa generalnim projektom procesa i postrojenja - Poluindustrijsko postrojenje za sintezu biodizela iz suncokretovog ulja i metanola u koloni sa pakovanim slojem negašenog kreča kao katalizatorom. 2014;.
https://hdl.handle.net/21.15107/rcub_cer_3753 .

Popović, Zoran, Marinković, Dalibor, Nešić, Gordana, Veljković, Vlada B., Stamenković, Olivera, "Prethodna studija opravdanosti sa generalnim projektom procesa i postrojenja - Poluindustrijsko postrojenje za sintezu biodizela iz suncokretovog ulja i metanola u koloni sa pakovanim slojem negašenog kreča kao katalizatorom" (2014),
https://hdl.handle.net/21.15107/rcub_cer_3753 .

TY  - JOUR
AU  - Ilić, Slavica B.
AU  - Konstantinović, Sandra S.
AU  - Gojgić-Cvijović, Gordana
AU  - Savic, Dragisa S.
AU  - Veljković, Vlada B.
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1314
AB  - The impact of different carbon sources on the antibiotic production by Streptomyces hygroscopicus CH-7 was studied with the main goal to increase the yield of antibiotics hexaene H-85 and elaiophylin. Glucose, as a basic carbon source in the nutrition medium, was replaced with glycerol, xylose, sorbose, melibiose, inulin, and mannitol (15 g/dm(3)). Insuring the maximum yields of hexaene and elaiophylin of 192 and 88 mu g/cm(3), respectively, glycerol was shown to be the best carbon source among the investigated ones.
PB  - Springer Birkhauser, New York
T2  - Medicinal Chemistry Research
T1  - The impact of glycerol and some carbohydrates on antibiotic production by Streptomyces hygroscopicus CH-7
VL  - 22
IS  - 2
SP  - 934
EP  - 937
DO  - 10.1007/s00044-012-0088-9
ER  - 

@article{
author = "Ilić, Slavica B. and Konstantinović, Sandra S. and Gojgić-Cvijović, Gordana and Savic, Dragisa S. and Veljković, Vlada B.",
year = "2013",
abstract = "The impact of different carbon sources on the antibiotic production by Streptomyces hygroscopicus CH-7 was studied with the main goal to increase the yield of antibiotics hexaene H-85 and elaiophylin. Glucose, as a basic carbon source in the nutrition medium, was replaced with glycerol, xylose, sorbose, melibiose, inulin, and mannitol (15 g/dm(3)). Insuring the maximum yields of hexaene and elaiophylin of 192 and 88 mu g/cm(3), respectively, glycerol was shown to be the best carbon source among the investigated ones.",
publisher = "Springer Birkhauser, New York",
journal = "Medicinal Chemistry Research",
title = "The impact of glycerol and some carbohydrates on antibiotic production by Streptomyces hygroscopicus CH-7",
volume = "22",
number = "2",
pages = "934-937",
doi = "10.1007/s00044-012-0088-9"
}

Ilić, S. B., Konstantinović, S. S., Gojgić-Cvijović, G., Savic, D. S.,& Veljković, V. B.. (2013). The impact of glycerol and some carbohydrates on antibiotic production by Streptomyces hygroscopicus CH-7. in Medicinal Chemistry Research
Springer Birkhauser, New York., 22(2), 934-937.
https://doi.org/10.1007/s00044-012-0088-9

Ilić SB, Konstantinović SS, Gojgić-Cvijović G, Savic DS, Veljković VB. The impact of glycerol and some carbohydrates on antibiotic production by Streptomyces hygroscopicus CH-7. in Medicinal Chemistry Research. 2013;22(2):934-937.
doi:10.1007/s00044-012-0088-9 .

Ilić, Slavica B., Konstantinović, Sandra S., Gojgić-Cvijović, Gordana, Savic, Dragisa S., Veljković, Vlada B., "The impact of glycerol and some carbohydrates on antibiotic production by Streptomyces hygroscopicus CH-7" in Medicinal Chemistry Research, 22, no. 2 (2013):934-937,
https://doi.org/10.1007/s00044-012-0088-9 . .

TY  - BOOK
AU  - Ilić, Slavica
AU  - Konstantinović, Sandra
AU  - Gojgić-Cvijović, Gordana
AU  - Veljković, Vlada
AU  - Savić, Dragiša
PY  - 2012
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5001
PB  - Leskovac : Tehnološki fakultet
T1  - Biosinteza antibiotika pomoću streptomiceta iz različitih izvora ugljenika i azota
UR  - https://hdl.handle.net/21.15107/rcub_cer_5001
ER  - 

@book{
author = "Ilić, Slavica and Konstantinović, Sandra and Gojgić-Cvijović, Gordana and Veljković, Vlada and Savić, Dragiša",
year = "2012",
publisher = "Leskovac : Tehnološki fakultet",
title = "Biosinteza antibiotika pomoću streptomiceta iz različitih izvora ugljenika i azota",
url = "https://hdl.handle.net/21.15107/rcub_cer_5001"
}

Ilić, S., Konstantinović, S., Gojgić-Cvijović, G., Veljković, V.,& Savić, D.. (2012). Biosinteza antibiotika pomoću streptomiceta iz različitih izvora ugljenika i azota. 
Leskovac : Tehnološki fakultet..
https://hdl.handle.net/21.15107/rcub_cer_5001

Ilić S, Konstantinović S, Gojgić-Cvijović G, Veljković V, Savić D. Biosinteza antibiotika pomoću streptomiceta iz različitih izvora ugljenika i azota. 2012;.
https://hdl.handle.net/21.15107/rcub_cer_5001 .

Ilić, Slavica, Konstantinović, Sandra, Gojgić-Cvijović, Gordana, Veljković, Vlada, Savić, Dragiša, "Biosinteza antibiotika pomoću streptomiceta iz različitih izvora ugljenika i azota" (2012),
https://hdl.handle.net/21.15107/rcub_cer_5001 .

TY  - JOUR
AU  - Ilić, Slavica B.
AU  - Konstantinović, Sandra S.
AU  - Savić, D.S.
AU  - Veljković, Vlada B.
AU  - Gojgić-Cvijović, Gordana
PY  - 2010
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/754
AB  - A media consisting of isatin-Schiff bases (isatin-3-thiosemicarbazone, isatin-3-semicarbazone, and isatin-3-phenylhydrazone) was developed to maximize the production of antibiotics Hexaene H-85 and Azalomycine B by Streptomyces hygroscopicus. The media isatin-3-thiosemicarbazone resulted in the maximum antibiotics concentration of 372 μg cm-3 for Hexaene H-85 and 118 μg cm-3 for Azalomycine B. The impact of modified media on soil morphology also was investigated.
T2  - Medicinal Chemistry Research
T1  - The impact of Schiff bases on antibiotic production by Streptomyces hygroscopicus
VL  - 19
IS  - 7
SP  - 690
EP  - 697
DO  - 10.1007/s00044-009-9223-7
ER  - 

@article{
author = "Ilić, Slavica B. and Konstantinović, Sandra S. and Savić, D.S. and Veljković, Vlada B. and Gojgić-Cvijović, Gordana",
year = "2010",
abstract = "A media consisting of isatin-Schiff bases (isatin-3-thiosemicarbazone, isatin-3-semicarbazone, and isatin-3-phenylhydrazone) was developed to maximize the production of antibiotics Hexaene H-85 and Azalomycine B by Streptomyces hygroscopicus. The media isatin-3-thiosemicarbazone resulted in the maximum antibiotics concentration of 372 μg cm-3 for Hexaene H-85 and 118 μg cm-3 for Azalomycine B. The impact of modified media on soil morphology also was investigated.",
journal = "Medicinal Chemistry Research",
title = "The impact of Schiff bases on antibiotic production by Streptomyces hygroscopicus",
volume = "19",
number = "7",
pages = "690-697",
doi = "10.1007/s00044-009-9223-7"
}

Ilić, S. B., Konstantinović, S. S., Savić, D.S., Veljković, V. B.,& Gojgić-Cvijović, G.. (2010). The impact of Schiff bases on antibiotic production by Streptomyces hygroscopicus. in Medicinal Chemistry Research, 19(7), 690-697.
https://doi.org/10.1007/s00044-009-9223-7

Ilić SB, Konstantinović SS, Savić D, Veljković VB, Gojgić-Cvijović G. The impact of Schiff bases on antibiotic production by Streptomyces hygroscopicus. in Medicinal Chemistry Research. 2010;19(7):690-697.
doi:10.1007/s00044-009-9223-7 .

Ilić, Slavica B., Konstantinović, Sandra S., Savić, D.S., Veljković, Vlada B., Gojgić-Cvijović, Gordana, "The impact of Schiff bases on antibiotic production by Streptomyces hygroscopicus" in Medicinal Chemistry Research, 19, no. 7 (2010):690-697,
https://doi.org/10.1007/s00044-009-9223-7 . .