TY  - JOUR
AU  - Potkonjak, Nebojsa I.
AU  - Veselinović, Dragan S.
AU  - Novaković, Miroslav
AU  - Gorjanović, Stanislava Ž.
AU  - Pezo, Lato
AU  - Suznjevic, Desanka Z.
PY  - 2012
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1128
AB  - Antioxidant activity (AO) of commercial propolis extracts (PEs), available on Serbian market, was determined by direct current (DC) polarography. Polarographic anodic current of 5.0 mmol L-1 alkaline solution of H2O2 was recorded at potentials of mercury dissolution. Decrease of the current was plotted against the volume of gradually added PEs. The volume of PE causing 20% current decrease was determined from the linear part of the plot. Antioxidant activity was expressed in H2O2 equivalent (HPEq), representing the volume of PE that corresponds to 1.0 mmol L-1 H2O2 decrease. Resulting HPEq ranged between 1.71 +/- 0.11 and 8.00 +/- 0.18 mu L. Range of 1,1-dipheny1-2-picryl hydrazyl (DPPH) radical scavenging activity was from 0.093 +/- 0.004% to 0.346 +/- 0.006%. Total phenolic content (TCP) of PE with superior AO activity was 5.31 +/- 0.05%g GAE, while the extract with the lowest activity contained 1.45 +/- 0.02%g GAE. Antioxidant activity, determined by polarographic method, was correlated with DPPH scavenging activity (R-2 = 0.991) and TCP (R-2 = 0.985). Validity of obtained results was further confirmed using ANOVA and post hoc Tukey HSD test.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - Food and Chemical Toxicology
T1  - Antioxidant activity of propolis extracts from Serbia: A polarographic approach
VL  - 50
IS  - 10
SP  - 3614
EP  - 3618
DO  - 10.1016/j.fct.2012.07.029
ER  - 

@article{
author = "Potkonjak, Nebojsa I. and Veselinović, Dragan S. and Novaković, Miroslav and Gorjanović, Stanislava Ž. and Pezo, Lato and Suznjevic, Desanka Z.",
year = "2012",
abstract = "Antioxidant activity (AO) of commercial propolis extracts (PEs), available on Serbian market, was determined by direct current (DC) polarography. Polarographic anodic current of 5.0 mmol L-1 alkaline solution of H2O2 was recorded at potentials of mercury dissolution. Decrease of the current was plotted against the volume of gradually added PEs. The volume of PE causing 20% current decrease was determined from the linear part of the plot. Antioxidant activity was expressed in H2O2 equivalent (HPEq), representing the volume of PE that corresponds to 1.0 mmol L-1 H2O2 decrease. Resulting HPEq ranged between 1.71 +/- 0.11 and 8.00 +/- 0.18 mu L. Range of 1,1-dipheny1-2-picryl hydrazyl (DPPH) radical scavenging activity was from 0.093 +/- 0.004% to 0.346 +/- 0.006%. Total phenolic content (TCP) of PE with superior AO activity was 5.31 +/- 0.05%g GAE, while the extract with the lowest activity contained 1.45 +/- 0.02%g GAE. Antioxidant activity, determined by polarographic method, was correlated with DPPH scavenging activity (R-2 = 0.991) and TCP (R-2 = 0.985). Validity of obtained results was further confirmed using ANOVA and post hoc Tukey HSD test.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "Food and Chemical Toxicology",
title = "Antioxidant activity of propolis extracts from Serbia: A polarographic approach",
volume = "50",
number = "10",
pages = "3614-3618",
doi = "10.1016/j.fct.2012.07.029"
}

Potkonjak, N. I., Veselinović, D. S., Novaković, M., Gorjanović, S. Ž., Pezo, L.,& Suznjevic, D. Z.. (2012). Antioxidant activity of propolis extracts from Serbia: A polarographic approach. in Food and Chemical Toxicology
Oxford : Pergamon-Elsevier Science Ltd., 50(10), 3614-3618.
https://doi.org/10.1016/j.fct.2012.07.029

Potkonjak NI, Veselinović DS, Novaković M, Gorjanović SŽ, Pezo L, Suznjevic DZ. Antioxidant activity of propolis extracts from Serbia: A polarographic approach. in Food and Chemical Toxicology. 2012;50(10):3614-3618.
doi:10.1016/j.fct.2012.07.029 .

Potkonjak, Nebojsa I., Veselinović, Dragan S., Novaković, Miroslav, Gorjanović, Stanislava Ž., Pezo, Lato, Suznjevic, Desanka Z., "Antioxidant activity of propolis extracts from Serbia: A polarographic approach" in Food and Chemical Toxicology, 50, no. 10 (2012):3614-3618,
https://doi.org/10.1016/j.fct.2012.07.029 . .

TY  - JOUR
AU  - Dimitrić Marković, Jasmina M.
AU  - Marković, Zoran S.
AU  - Veselinović, Dragan S.
AU  - Krstić, Jugoslav
AU  - Predojević, Simović J.D.
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/566
AB  - Spectroscopic (UV/visible and IR) and theoretical studies were used to assess relevant interaction of fisetin, a tetrahydroxylated flavone molecule, and trivalent aluminium in a wide range of buffered aqueous solutions. The chelation sites, stoichiometry, stability and the dependence of the complexes structures on pH and aluminium/fisetin mole ratios were defined. Obtained results implicated successive formation of two complexes with aluminium(III)-fisetin stoichiometries of 1:1 and 2:1. Considering the fisetin molecular structure, results of vibrational analysis and theoretical calculations, it is possible to implicate 3-hydroxyl-4-carbonyl and 3′4′-dihydroxyl groups as those with the possible chelating power. The equilibrium geometries were optimized in vacuum at the B3LYP/6-31G(d) level of theory, which predict structural modifications between the ligand molecule in free state and in the complex structure. The theoretical model has been validated by both vibrational and electronic spectroscopies.
PB  - Elsevier Science Inc, New York
T2  - Journal of Inorganic Biochemistry
T1  - Study on fisetin-aluminium(III) interaction in aqueous buffered solutions by spectroscopy and molecular modeling
VL  - 103
IS  - 5
SP  - 723
EP  - 730
DO  - 10.1016/j.jinorgbio.2009.01.005
ER  - 

@article{
author = "Dimitrić Marković, Jasmina M. and Marković, Zoran S. and Veselinović, Dragan S. and Krstić, Jugoslav and Predojević, Simović J.D.",
year = "2009",
abstract = "Spectroscopic (UV/visible and IR) and theoretical studies were used to assess relevant interaction of fisetin, a tetrahydroxylated flavone molecule, and trivalent aluminium in a wide range of buffered aqueous solutions. The chelation sites, stoichiometry, stability and the dependence of the complexes structures on pH and aluminium/fisetin mole ratios were defined. Obtained results implicated successive formation of two complexes with aluminium(III)-fisetin stoichiometries of 1:1 and 2:1. Considering the fisetin molecular structure, results of vibrational analysis and theoretical calculations, it is possible to implicate 3-hydroxyl-4-carbonyl and 3′4′-dihydroxyl groups as those with the possible chelating power. The equilibrium geometries were optimized in vacuum at the B3LYP/6-31G(d) level of theory, which predict structural modifications between the ligand molecule in free state and in the complex structure. The theoretical model has been validated by both vibrational and electronic spectroscopies.",
publisher = "Elsevier Science Inc, New York",
journal = "Journal of Inorganic Biochemistry",
title = "Study on fisetin-aluminium(III) interaction in aqueous buffered solutions by spectroscopy and molecular modeling",
volume = "103",
number = "5",
pages = "723-730",
doi = "10.1016/j.jinorgbio.2009.01.005"
}

Dimitrić Marković, J. M., Marković, Z. S., Veselinović, D. S., Krstić, J.,& Predojević, S. J.D.. (2009). Study on fisetin-aluminium(III) interaction in aqueous buffered solutions by spectroscopy and molecular modeling. in Journal of Inorganic Biochemistry
Elsevier Science Inc, New York., 103(5), 723-730.
https://doi.org/10.1016/j.jinorgbio.2009.01.005

Dimitrić Marković JM, Marković ZS, Veselinović DS, Krstić J, Predojević SJ. Study on fisetin-aluminium(III) interaction in aqueous buffered solutions by spectroscopy and molecular modeling. in Journal of Inorganic Biochemistry. 2009;103(5):723-730.
doi:10.1016/j.jinorgbio.2009.01.005 .

Dimitrić Marković, Jasmina M., Marković, Zoran S., Veselinović, Dragan S., Krstić, Jugoslav, Predojević, Simović J.D., "Study on fisetin-aluminium(III) interaction in aqueous buffered solutions by spectroscopy and molecular modeling" in Journal of Inorganic Biochemistry, 103, no. 5 (2009):723-730,
https://doi.org/10.1016/j.jinorgbio.2009.01.005 . .

TY  - JOUR
AU  - Marković, Dragan A.
AU  - Veselinović, Dragan S.
AU  - Milenković, S.
PY  - 1976
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4385
AB  - It is already known [1--5] that Ti, W, V, Mo and some other metals form
coloured complexes with 1,4-benzenediol in concentrated sulphuric acid. We
have also found that hydroxybenzene has similar properties. Papers found in
the literature dealing with complex compounds of these metals with various
phenols are not numerous [6--9]. Most of them refer to spectrophotometric
investigations of the complex compounds mentioned and only one [7] deals
with polarographic investigation of the molybdenum complex with 1,4-benzenediol
in sulphuric acid of various concentrations.
PB  - Elsevier
T2  - Journal of Electroanalytical Chemistry
T1  - Molybdenum and hydroxybenzene complexes in concentrated sulphuric acid
VL  - 73
IS  - 1
SP  - 109
EP  - 113
DO  - 10.1016/S0022-0728(76)80095-2
ER  - 

@article{
author = "Marković, Dragan A. and Veselinović, Dragan S. and Milenković, S.",
year = "1976",
abstract = "It is already known [1--5] that Ti, W, V, Mo and some other metals form
coloured complexes with 1,4-benzenediol in concentrated sulphuric acid. We
have also found that hydroxybenzene has similar properties. Papers found in
the literature dealing with complex compounds of these metals with various
phenols are not numerous [6--9]. Most of them refer to spectrophotometric
investigations of the complex compounds mentioned and only one [7] deals
with polarographic investigation of the molybdenum complex with 1,4-benzenediol
in sulphuric acid of various concentrations.",
publisher = "Elsevier",
journal = "Journal of Electroanalytical Chemistry",
title = "Molybdenum and hydroxybenzene complexes in concentrated sulphuric acid",
volume = "73",
number = "1",
pages = "109-113",
doi = "10.1016/S0022-0728(76)80095-2"
}

Marković, D. A., Veselinović, D. S.,& Milenković, S.. (1976). Molybdenum and hydroxybenzene complexes in concentrated sulphuric acid. in Journal of Electroanalytical Chemistry
Elsevier., 73(1), 109-113.
https://doi.org/10.1016/S0022-0728(76)80095-2

Marković DA, Veselinović DS, Milenković S. Molybdenum and hydroxybenzene complexes in concentrated sulphuric acid. in Journal of Electroanalytical Chemistry. 1976;73(1):109-113.
doi:10.1016/S0022-0728(76)80095-2 .

Marković, Dragan A., Veselinović, Dragan S., Milenković, S., "Molybdenum and hydroxybenzene complexes in concentrated sulphuric acid" in Journal of Electroanalytical Chemistry, 73, no. 1 (1976):109-113,
https://doi.org/10.1016/S0022-0728(76)80095-2 . .

TY  - JOUR
AU  - Veselinović, Dragan S.
AU  - Marković, Dragan A.
AU  - Mirjanić, Miroslav D.
PY  - 1974
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4719
AB  - Many authors have dealt with the formation of the complexes of 1,4-benzenediol and some metals in concentrated sulphuric acid. However, no data can be found in the literature either on the reaction of 1,4-benzenediol with concentrated sulphuric acid or on the possible effect of such a reaction on the composition of the complex compound formed. In order to be able to discuss
this problem in more detail we decided to investigate the behaviour of the following systems: concentrated sulphuric acid 1,4-benzenediol and concentrated sulphuric acld-hydroxybenzene. Investigations were carried out by measuring conductivity and viscosity of 1,4-benzenediol and hydroxybenzene solutions in concentrated sulphuric acid.
PB  - Elsevier
T2  - Journal of Electroanalytical Chemistry and Interfacial Electrochemistry
T1  - Electric conductivity and viscosity of 1,4-benzenediol and hydroxybenzene solutions in concentrated sulphuric acid
VL  - 53
IS  - 3
SP  - 468
EP  - 473
DO  - 10.1016/S0022-0728(74)80086-0
ER  - 

@article{
author = "Veselinović, Dragan S. and Marković, Dragan A. and Mirjanić, Miroslav D.",
year = "1974",
abstract = "Many authors have dealt with the formation of the complexes of 1,4-benzenediol and some metals in concentrated sulphuric acid. However, no data can be found in the literature either on the reaction of 1,4-benzenediol with concentrated sulphuric acid or on the possible effect of such a reaction on the composition of the complex compound formed. In order to be able to discuss
this problem in more detail we decided to investigate the behaviour of the following systems: concentrated sulphuric acid 1,4-benzenediol and concentrated sulphuric acld-hydroxybenzene. Investigations were carried out by measuring conductivity and viscosity of 1,4-benzenediol and hydroxybenzene solutions in concentrated sulphuric acid.",
publisher = "Elsevier",
journal = "Journal of Electroanalytical Chemistry and Interfacial Electrochemistry",
title = "Electric conductivity and viscosity of 1,4-benzenediol and hydroxybenzene solutions in concentrated sulphuric acid",
volume = "53",
number = "3",
pages = "468-473",
doi = "10.1016/S0022-0728(74)80086-0"
}

Veselinović, D. S., Marković, D. A.,& Mirjanić, M. D.. (1974). Electric conductivity and viscosity of 1,4-benzenediol and hydroxybenzene solutions in concentrated sulphuric acid. in Journal of Electroanalytical Chemistry and Interfacial Electrochemistry
Elsevier., 53(3), 468-473.
https://doi.org/10.1016/S0022-0728(74)80086-0

Veselinović DS, Marković DA, Mirjanić MD. Electric conductivity and viscosity of 1,4-benzenediol and hydroxybenzene solutions in concentrated sulphuric acid. in Journal of Electroanalytical Chemistry and Interfacial Electrochemistry. 1974;53(3):468-473.
doi:10.1016/S0022-0728(74)80086-0 .

Veselinović, Dragan S., Marković, Dragan A., Mirjanić, Miroslav D., "Electric conductivity and viscosity of 1,4-benzenediol and hydroxybenzene solutions in concentrated sulphuric acid" in Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 53, no. 3 (1974):468-473,
https://doi.org/10.1016/S0022-0728(74)80086-0 . .