Sikora, Vladimir

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orcid::0000-0002-3990-4010
  • Sikora, Vladimir (2)
  • Sikora, Vladimir Š. (1)

Author's Bibliography

Chemical Composition, Antioxidant Potential, and Nutritional Evaluation of Cultivated Sorghum Grains: A Combined Experimental, Theoretical, and Multivariate Analysis

Jaćimović, Simona; Kiprovski, Biljana; Ristivojević, Petar; Dimić, Dušan; Nakarada, Đura; Dojčinović, Biljana; Sikora, Vladimir; Teslić, Nemanja; Pantelić, Nebojša

(MDPI, 2023)

TY  - JOUR
AU  - Jaćimović, Simona
AU  - Kiprovski, Biljana
AU  - Ristivojević, Petar
AU  - Dimić, Dušan
AU  - Nakarada, Đura
AU  - Dojčinović, Biljana
AU  - Sikora, Vladimir
AU  - Teslić, Nemanja
AU  - Pantelić, Nebojša
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7194
AB  - Sorghum grain (Sorghum bicolor L. Moench) is a gluten-free cereal with excellent nutritional value and is a good source of antioxidants, including polyphenols, as well as minerals with proven health benefits. Herein, the phenolic composition, elemental profile, and antioxidant activity of sixteen food-grade sorghum grains (S1–S16) grown under agroecological conditions in Serbia were determined. Nine phenolic compounds characteristic of sorghum grains, such as luteolinidin, 5-methoxyluteolinidin, luteolidin derivative, luteolidin glucoside, apigeninidin, 7-methoxyapigeninidin, apigeninidin glucoside, and cyanidin derivative, were quantified. The antioxidant potential of the analyzed sorghum grains was evaluated by UV/Vis (DPPH, ABTS, and FRAP) and Electron Paramagnetic Resonance spectroscopy (hydroxyl and ascorbyl radical scavenging assays). The content of macro- and microelements was determined by Inductively Coupled Plasma Optical Emission spectroscopy. Theoretical daily intakes of selected major and trace elements were assessed and compared with the Recommended Daily Allowance or Adequate Intake. Sample S8 had the highest amount of phenolic compounds, while S4, S6, and S8 exhibited the strongest antioxidative potential. The sorghum studied could completely satisfy the daily needs of macro- (K, Mg, and P) and microelements (Se, Zn, Fe). Pattern recognition techniques confirmed the discrimination of samples based on phenolic profile and elemental analysis and recognized the main markers responsible for differences between the investigated samples. The reaction between hydroxyl radicals and luteolinidin/apigeninidin was investigated by Density Functional Theory and thermodynamically preferred mechanism was determined.
PB  - MDPI
T2  - Antioxidants
T2  - Antioxidants
T1  - Chemical Composition, Antioxidant Potential, and Nutritional Evaluation of Cultivated Sorghum Grains: A Combined Experimental, Theoretical, and Multivariate Analysis
VL  - 12
IS  - 8
SP  - 1485
DO  - 10.3390/antiox12081485
ER  - 
@article{
author = "Jaćimović, Simona and Kiprovski, Biljana and Ristivojević, Petar and Dimić, Dušan and Nakarada, Đura and Dojčinović, Biljana and Sikora, Vladimir and Teslić, Nemanja and Pantelić, Nebojša",
year = "2023",
abstract = "Sorghum grain (Sorghum bicolor L. Moench) is a gluten-free cereal with excellent nutritional value and is a good source of antioxidants, including polyphenols, as well as minerals with proven health benefits. Herein, the phenolic composition, elemental profile, and antioxidant activity of sixteen food-grade sorghum grains (S1–S16) grown under agroecological conditions in Serbia were determined. Nine phenolic compounds characteristic of sorghum grains, such as luteolinidin, 5-methoxyluteolinidin, luteolidin derivative, luteolidin glucoside, apigeninidin, 7-methoxyapigeninidin, apigeninidin glucoside, and cyanidin derivative, were quantified. The antioxidant potential of the analyzed sorghum grains was evaluated by UV/Vis (DPPH, ABTS, and FRAP) and Electron Paramagnetic Resonance spectroscopy (hydroxyl and ascorbyl radical scavenging assays). The content of macro- and microelements was determined by Inductively Coupled Plasma Optical Emission spectroscopy. Theoretical daily intakes of selected major and trace elements were assessed and compared with the Recommended Daily Allowance or Adequate Intake. Sample S8 had the highest amount of phenolic compounds, while S4, S6, and S8 exhibited the strongest antioxidative potential. The sorghum studied could completely satisfy the daily needs of macro- (K, Mg, and P) and microelements (Se, Zn, Fe). Pattern recognition techniques confirmed the discrimination of samples based on phenolic profile and elemental analysis and recognized the main markers responsible for differences between the investigated samples. The reaction between hydroxyl radicals and luteolinidin/apigeninidin was investigated by Density Functional Theory and thermodynamically preferred mechanism was determined.",
publisher = "MDPI",
journal = "Antioxidants, Antioxidants",
title = "Chemical Composition, Antioxidant Potential, and Nutritional Evaluation of Cultivated Sorghum Grains: A Combined Experimental, Theoretical, and Multivariate Analysis",
volume = "12",
number = "8",
pages = "1485",
doi = "10.3390/antiox12081485"
}
Jaćimović, S., Kiprovski, B., Ristivojević, P., Dimić, D., Nakarada, Đ., Dojčinović, B., Sikora, V., Teslić, N.,& Pantelić, N.. (2023). Chemical Composition, Antioxidant Potential, and Nutritional Evaluation of Cultivated Sorghum Grains: A Combined Experimental, Theoretical, and Multivariate Analysis. in Antioxidants
MDPI., 12(8), 1485.
https://doi.org/10.3390/antiox12081485
Jaćimović S, Kiprovski B, Ristivojević P, Dimić D, Nakarada Đ, Dojčinović B, Sikora V, Teslić N, Pantelić N. Chemical Composition, Antioxidant Potential, and Nutritional Evaluation of Cultivated Sorghum Grains: A Combined Experimental, Theoretical, and Multivariate Analysis. in Antioxidants. 2023;12(8):1485.
doi:10.3390/antiox12081485 .
Jaćimović, Simona, Kiprovski, Biljana, Ristivojević, Petar, Dimić, Dušan, Nakarada, Đura, Dojčinović, Biljana, Sikora, Vladimir, Teslić, Nemanja, Pantelić, Nebojša, "Chemical Composition, Antioxidant Potential, and Nutritional Evaluation of Cultivated Sorghum Grains: A Combined Experimental, Theoretical, and Multivariate Analysis" in Antioxidants, 12, no. 8 (2023):1485,
https://doi.org/10.3390/antiox12081485 . .
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Weather conditions influence on hyssop essential oil quality

Aćimović, Milica; Pezo, Lato; Zeremski, Tijana; Lončar, Biljana; Marjanović Jeromela, Ana; Stanković Jeremić, Jovana; Cvetković, Mirjana; Sikora, Vladimir; Ignjatov, Maja

(MDPI, 2021)

TY  - JOUR
AU  - Aćimović, Milica
AU  - Pezo, Lato
AU  - Zeremski, Tijana
AU  - Lončar, Biljana
AU  - Marjanović  Jeromela, Ana
AU  - Stanković Jeremić, Jovana
AU  - Cvetković, Mirjana
AU  - Sikora, Vladimir
AU  - Ignjatov, Maja
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4829
AB  - This paper is a study of the chemical composition of Hyssopus officinalis ssp. Officinalis grown during three years (2017-2019) at the Institute of Field and Vegetable Crops Novi Sad (Vojvodina Province, Serbia). Furthermore, comparisons with ISO standards during the years were also investigated, as well as a prediction model of retention indices of compounds from the essential oils. An essential oil obtained by hydrodistillation and analysed by GC-FID and GC-MS was isopinocamphone chemotype. The gathered information about the volatile compounds from H. officinalis was used to classify the samples using the unrooted cluster tree. The correlation analysis was applied to investigate the similarity of different samples, according to GC-MS data. The quantitative structure- retention relationship (QSRR) was also employed to predict the retention indices of the identified compounds. A total of 74 experimentally obtained retention indices were used to build a prediction model. The coefficient of determination for the training cycle was 0.910, indicating that this model could be used for the prediction of retention indices for H. officinalis essential oil compounds.
PB  - MDPI
T2  - Processes
T1  - Weather conditions influence on hyssop essential oil quality
VL  - 9
IS  - 7
SP  - 1152
DO  - 10.3390/pr9071152
ER  - 
@article{
author = "Aćimović, Milica and Pezo, Lato and Zeremski, Tijana and Lončar, Biljana and Marjanović  Jeromela, Ana and Stanković Jeremić, Jovana and Cvetković, Mirjana and Sikora, Vladimir and Ignjatov, Maja",
year = "2021",
abstract = "This paper is a study of the chemical composition of Hyssopus officinalis ssp. Officinalis grown during three years (2017-2019) at the Institute of Field and Vegetable Crops Novi Sad (Vojvodina Province, Serbia). Furthermore, comparisons with ISO standards during the years were also investigated, as well as a prediction model of retention indices of compounds from the essential oils. An essential oil obtained by hydrodistillation and analysed by GC-FID and GC-MS was isopinocamphone chemotype. The gathered information about the volatile compounds from H. officinalis was used to classify the samples using the unrooted cluster tree. The correlation analysis was applied to investigate the similarity of different samples, according to GC-MS data. The quantitative structure- retention relationship (QSRR) was also employed to predict the retention indices of the identified compounds. A total of 74 experimentally obtained retention indices were used to build a prediction model. The coefficient of determination for the training cycle was 0.910, indicating that this model could be used for the prediction of retention indices for H. officinalis essential oil compounds.",
publisher = "MDPI",
journal = "Processes",
title = "Weather conditions influence on hyssop essential oil quality",
volume = "9",
number = "7",
pages = "1152",
doi = "10.3390/pr9071152"
}
Aćimović, M., Pezo, L., Zeremski, T., Lončar, B., Marjanović  Jeromela, A., Stanković Jeremić, J., Cvetković, M., Sikora, V.,& Ignjatov, M.. (2021). Weather conditions influence on hyssop essential oil quality. in Processes
MDPI., 9(7), 1152.
https://doi.org/10.3390/pr9071152
Aćimović M, Pezo L, Zeremski T, Lončar B, Marjanović  Jeromela A, Stanković Jeremić J, Cvetković M, Sikora V, Ignjatov M. Weather conditions influence on hyssop essential oil quality. in Processes. 2021;9(7):1152.
doi:10.3390/pr9071152 .
Aćimović, Milica, Pezo, Lato, Zeremski, Tijana, Lončar, Biljana, Marjanović  Jeromela, Ana, Stanković Jeremić, Jovana, Cvetković, Mirjana, Sikora, Vladimir, Ignjatov, Maja, "Weather conditions influence on hyssop essential oil quality" in Processes, 9, no. 7 (2021):1152,
https://doi.org/10.3390/pr9071152 . .
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Chemical characterization of marrubium vulgare volatiles from Serbia

Aćimović, Milica G.; Ivanović, Stefan; Simić, Katarina; Pezo, Lato; Zeremski, Tijana; Ovuka, Jelena S.; Sikora, Vladimir Š.

(MDPI, 2021)

TY  - JOUR
AU  - Aćimović, Milica G.
AU  - Ivanović, Stefan
AU  - Simić, Katarina
AU  - Pezo, Lato
AU  - Zeremski, Tijana
AU  - Ovuka, Jelena S.
AU  - Sikora, Vladimir Š.
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4601
AB  - Marrubium vulgare is a cosmopolitan medicinal plant from the Lamiaceae family, which produces structurally highly diverse groups of secondary metabolites. A total of 160 compounds were determined in the volatiles from Serbia during two investigated years (2019 and 2020). The main components were E-caryophyllene, followed by germacrene D, α-humulene and α-copaene. All these compounds are from sesquiterpene hydrocarbons class which was dominant in both investigated years. This variation in volatiles composition could be a consequence of weather conditions, as in the case of other aromatic plants. According to the unrooted cluster tree with 37 samples of Marrubium sp. volatiles from literature and average values from this study, it could be said that there are several chemotypes: E-caryophyllene, β-bisabolene, α-pinene, β-farnesene, E-caryophyllene + caryophyllene oxide chemotype, and diverse (unclassified) chemotypes. However, occurring polymorphism could be consequence of adaptation to grow in different environment, especially ecological conditions such as humidity, temperature and altitude, as well as hybridization strongly affected the chemotypes. In addition, this paper aimed to obtain validated models for prediction of retention indices (RIs) of compounds isolated from M. vulgare volatiles. A total of 160 experimentally obtained RIs of volatile compounds was used to build the prediction models. The coefficients of determination were 0.956 and 0.964, demonstrating that these models could be used for predicting RIs, due to low prediction error and high r2 .
PB  - MDPI
T2  - Plants
T1  - Chemical characterization of marrubium vulgare volatiles from Serbia
VL  - 10
IS  - 3
SP  - 600
DO  - 10.3390/plants10030600
ER  - 
@article{
author = "Aćimović, Milica G. and Ivanović, Stefan and Simić, Katarina and Pezo, Lato and Zeremski, Tijana and Ovuka, Jelena S. and Sikora, Vladimir Š.",
year = "2021",
abstract = "Marrubium vulgare is a cosmopolitan medicinal plant from the Lamiaceae family, which produces structurally highly diverse groups of secondary metabolites. A total of 160 compounds were determined in the volatiles from Serbia during two investigated years (2019 and 2020). The main components were E-caryophyllene, followed by germacrene D, α-humulene and α-copaene. All these compounds are from sesquiterpene hydrocarbons class which was dominant in both investigated years. This variation in volatiles composition could be a consequence of weather conditions, as in the case of other aromatic plants. According to the unrooted cluster tree with 37 samples of Marrubium sp. volatiles from literature and average values from this study, it could be said that there are several chemotypes: E-caryophyllene, β-bisabolene, α-pinene, β-farnesene, E-caryophyllene + caryophyllene oxide chemotype, and diverse (unclassified) chemotypes. However, occurring polymorphism could be consequence of adaptation to grow in different environment, especially ecological conditions such as humidity, temperature and altitude, as well as hybridization strongly affected the chemotypes. In addition, this paper aimed to obtain validated models for prediction of retention indices (RIs) of compounds isolated from M. vulgare volatiles. A total of 160 experimentally obtained RIs of volatile compounds was used to build the prediction models. The coefficients of determination were 0.956 and 0.964, demonstrating that these models could be used for predicting RIs, due to low prediction error and high r2 .",
publisher = "MDPI",
journal = "Plants",
title = "Chemical characterization of marrubium vulgare volatiles from Serbia",
volume = "10",
number = "3",
pages = "600",
doi = "10.3390/plants10030600"
}
Aćimović, M. G., Ivanović, S., Simić, K., Pezo, L., Zeremski, T., Ovuka, J. S.,& Sikora, V. Š.. (2021). Chemical characterization of marrubium vulgare volatiles from Serbia. in Plants
MDPI., 10(3), 600.
https://doi.org/10.3390/plants10030600
Aćimović MG, Ivanović S, Simić K, Pezo L, Zeremski T, Ovuka JS, Sikora VŠ. Chemical characterization of marrubium vulgare volatiles from Serbia. in Plants. 2021;10(3):600.
doi:10.3390/plants10030600 .
Aćimović, Milica G., Ivanović, Stefan, Simić, Katarina, Pezo, Lato, Zeremski, Tijana, Ovuka, Jelena S., Sikora, Vladimir Š., "Chemical characterization of marrubium vulgare volatiles from Serbia" in Plants, 10, no. 3 (2021):600,
https://doi.org/10.3390/plants10030600 . .
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