TY  - JOUR
AU  - Gorjanović, Stanislava
AU  - Komes, Drazenka
AU  - Lalicic-Petronijevic, Jovanka
AU  - Pastor, Ferenc
AU  - Belscak-Cvitanovic, Ana
AU  - Veljović, Mile S.
AU  - Pezo, Lato
AU  - Suznjevic, Desanka Z.
PY  - 2017
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2484
AB  - Antioxidant (AO) capacity of instant, espresso, filter and Turkish/Greek coffee brews, coffee substitutes (roasted chicory root, barley, pea, chickpea, carob and dried fig) and individual compounds (phenolic acids, flavonoids, methylxanthines, N-methyl pyridinium and HMW melanoidins) was assessed using DC polarographic assay based on decrease of anodic current originating from hydroxo-perhydroxo mercury complex formed in alkaline solutions of H2O2 at potential of mercury dissolution, as well as three spectrophotometric assays (DPPH, ABTS and FRAP). A large difference between applied assays ability to recognize various types of individual AOs was noticed. Only according to DC polarographic assay significant AO activity was ascribed to methylxanthines and N-methyl pyridinum. The total content of phenolics (TPC) present in complex samples was determined by FC assay. The highest TPC was ascribed to instant coffees and coffee substitutes while the lowest to decaffeinated filter coffee. Complex samples were grouped based on principal components analysis, phenolics AO coefficient, calculated as the ratio between AO capacity and TPC, and relative AO capacity index (RACI), calculated by assigning equal weight to all applied assays including FC. The highest values of RACI were ascribed to instant coffee brews, followed by substitutes while the lowest to the decaffeinated espresso coffee.
PB  - Springer India, New Delhi
T2  - Journal of Food Science and Technology, Mysore
T1  - Antioxidant efficiency of polyphenols from coffee and coffee substitutes-electrochemical versus spectrophotometric approach
VL  - 54
IS  - 8
SP  - 2324
EP  - 2331
DO  - 10.1007/s13197-017-2672-y
ER  - 

@article{
author = "Gorjanović, Stanislava and Komes, Drazenka and Lalicic-Petronijevic, Jovanka and Pastor, Ferenc and Belscak-Cvitanovic, Ana and Veljović, Mile S. and Pezo, Lato and Suznjevic, Desanka Z.",
year = "2017",
abstract = "Antioxidant (AO) capacity of instant, espresso, filter and Turkish/Greek coffee brews, coffee substitutes (roasted chicory root, barley, pea, chickpea, carob and dried fig) and individual compounds (phenolic acids, flavonoids, methylxanthines, N-methyl pyridinium and HMW melanoidins) was assessed using DC polarographic assay based on decrease of anodic current originating from hydroxo-perhydroxo mercury complex formed in alkaline solutions of H2O2 at potential of mercury dissolution, as well as three spectrophotometric assays (DPPH, ABTS and FRAP). A large difference between applied assays ability to recognize various types of individual AOs was noticed. Only according to DC polarographic assay significant AO activity was ascribed to methylxanthines and N-methyl pyridinum. The total content of phenolics (TPC) present in complex samples was determined by FC assay. The highest TPC was ascribed to instant coffees and coffee substitutes while the lowest to decaffeinated filter coffee. Complex samples were grouped based on principal components analysis, phenolics AO coefficient, calculated as the ratio between AO capacity and TPC, and relative AO capacity index (RACI), calculated by assigning equal weight to all applied assays including FC. The highest values of RACI were ascribed to instant coffee brews, followed by substitutes while the lowest to the decaffeinated espresso coffee.",
publisher = "Springer India, New Delhi",
journal = "Journal of Food Science and Technology, Mysore",
title = "Antioxidant efficiency of polyphenols from coffee and coffee substitutes-electrochemical versus spectrophotometric approach",
volume = "54",
number = "8",
pages = "2324-2331",
doi = "10.1007/s13197-017-2672-y"
}

Gorjanović, S., Komes, D., Lalicic-Petronijevic, J., Pastor, F., Belscak-Cvitanovic, A., Veljović, M. S., Pezo, L.,& Suznjevic, D. Z.. (2017). Antioxidant efficiency of polyphenols from coffee and coffee substitutes-electrochemical versus spectrophotometric approach. in Journal of Food Science and Technology, Mysore
Springer India, New Delhi., 54(8), 2324-2331.
https://doi.org/10.1007/s13197-017-2672-y

Gorjanović S, Komes D, Lalicic-Petronijevic J, Pastor F, Belscak-Cvitanovic A, Veljović MS, Pezo L, Suznjevic DZ. Antioxidant efficiency of polyphenols from coffee and coffee substitutes-electrochemical versus spectrophotometric approach. in Journal of Food Science and Technology, Mysore. 2017;54(8):2324-2331.
doi:10.1007/s13197-017-2672-y .

Gorjanović, Stanislava, Komes, Drazenka, Lalicic-Petronijevic, Jovanka, Pastor, Ferenc, Belscak-Cvitanovic, Ana, Veljović, Mile S., Pezo, Lato, Suznjevic, Desanka Z., "Antioxidant efficiency of polyphenols from coffee and coffee substitutes-electrochemical versus spectrophotometric approach" in Journal of Food Science and Technology, Mysore, 54, no. 8 (2017):2324-2331,
https://doi.org/10.1007/s13197-017-2672-y . .

TY  - JOUR
AU  - Suznjevic, Desanka Z.
AU  - Pastor, Ferenc
AU  - Gorjanović, Stanislava
PY  - 2017
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/2554
AB  - Anodic stripping voltammetry (ASV) with rotating glassy carbon electrode (RGCE) and microfiber carbon electrode (mu FCE), both filmed with mercury, were used to determine copper content in wine. Influence of phenolics on in situ mercury film formation was studied. Wine and quercetin were added gradually into solution of Hg(II) in acetic acid-sodium acetate buffer (pH = 4.60). Reduction of Hg(II) was observed in both cases. In situ filmed electrode was found unsuitable. Results obtained using ex situ filmed RGCE and mu FCE were found in good agreement with ASV using hanging mercury drop electrode. Thus, ASV with ex situ mercury filmed electrodes can be recommended for accurate quantification of copper in complex samples containing phenolics, without any special pretreatments.
PB  - Croatian Chemical Soc, Zagreb
T2  - Croatica Chemica Acta
T1  - Determination of Copper in Wine by Anodic Stripping Voltammetry with Rotating Glassy Carbon and Microfiber Carbon Electrode
VL  - 90
IS  - 2
SP  - 353
EP  - 357
DO  - 10.5562/cca3178
ER  - 

@article{
author = "Suznjevic, Desanka Z. and Pastor, Ferenc and Gorjanović, Stanislava",
year = "2017",
abstract = "Anodic stripping voltammetry (ASV) with rotating glassy carbon electrode (RGCE) and microfiber carbon electrode (mu FCE), both filmed with mercury, were used to determine copper content in wine. Influence of phenolics on in situ mercury film formation was studied. Wine and quercetin were added gradually into solution of Hg(II) in acetic acid-sodium acetate buffer (pH = 4.60). Reduction of Hg(II) was observed in both cases. In situ filmed electrode was found unsuitable. Results obtained using ex situ filmed RGCE and mu FCE were found in good agreement with ASV using hanging mercury drop electrode. Thus, ASV with ex situ mercury filmed electrodes can be recommended for accurate quantification of copper in complex samples containing phenolics, without any special pretreatments.",
publisher = "Croatian Chemical Soc, Zagreb",
journal = "Croatica Chemica Acta",
title = "Determination of Copper in Wine by Anodic Stripping Voltammetry with Rotating Glassy Carbon and Microfiber Carbon Electrode",
volume = "90",
number = "2",
pages = "353-357",
doi = "10.5562/cca3178"
}

Suznjevic, D. Z., Pastor, F.,& Gorjanović, S.. (2017). Determination of Copper in Wine by Anodic Stripping Voltammetry with Rotating Glassy Carbon and Microfiber Carbon Electrode. in Croatica Chemica Acta
Croatian Chemical Soc, Zagreb., 90(2), 353-357.
https://doi.org/10.5562/cca3178

Suznjevic DZ, Pastor F, Gorjanović S. Determination of Copper in Wine by Anodic Stripping Voltammetry with Rotating Glassy Carbon and Microfiber Carbon Electrode. in Croatica Chemica Acta. 2017;90(2):353-357.
doi:10.5562/cca3178 .

Suznjevic, Desanka Z., Pastor, Ferenc, Gorjanović, Stanislava, "Determination of Copper in Wine by Anodic Stripping Voltammetry with Rotating Glassy Carbon and Microfiber Carbon Electrode" in Croatica Chemica Acta, 90, no. 2 (2017):353-357,
https://doi.org/10.5562/cca3178 . .

TY  - JOUR
AU  - Suznjevic, Desanka Z.
AU  - Pastor, Ferenc
AU  - Gorjanović, Stanislava
PY  - 2015
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1708
AB  - Direct current polarographic (DCP) antioxidant assay based on the decrease of anodic limiting current of HydroxoPerhydroxoMercury(II) Complex [Hg(O2H)(OH)] (HPMC) upon addition of antioxidants (AOs) was verified. Here, influence of several common AOs on DCP cathodic currents of both HPMC and Hg2+ was followed. Amperometric titrations of HPMC and Hg2+ with AOs and potentiometric titrations of Hg2+ were performed. The changes of DCP i-E curves and limiting currents decrease during amperometric titrations, as well as end points of amperometric and potentiometric titrations for each AO used as titrant proved the occurrence of Hg2+ reduction, either from complex (HPMC) or salt (HgCl2) solution. Constant H2O2 reduction current during amperometric titration of HPMC further confirmed the participation of Hg2+ as the oxidant species in reaction with AOs. The possibility of determining AO activity of flavonoids, phenolic acids, ascorbic acid and Trolox based on the decrease of Hg2+ reduction current was demonstrated. Strict correlation (R-2 = 0.96) between a new AO assay named MRAP (Mercury Reduction Antioxidant Power) and HPMC assay was found. Total AO capacity of real samples was measured by the proposed fast, simple and inexpensive MRAP assay as well. (C) 2015 Elsevier Ltd. All rights reserved.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Electrochimica Acta
T1  - DC polarographic examination of Hg2+ reduction applicability to antioxidant activity determination
VL  - 168
SP  - 240
EP  - 245
DO  - 10.1016/j.electacta.2015.04.008
ER  - 

@article{
author = "Suznjevic, Desanka Z. and Pastor, Ferenc and Gorjanović, Stanislava",
year = "2015",
abstract = "Direct current polarographic (DCP) antioxidant assay based on the decrease of anodic limiting current of HydroxoPerhydroxoMercury(II) Complex [Hg(O2H)(OH)] (HPMC) upon addition of antioxidants (AOs) was verified. Here, influence of several common AOs on DCP cathodic currents of both HPMC and Hg2+ was followed. Amperometric titrations of HPMC and Hg2+ with AOs and potentiometric titrations of Hg2+ were performed. The changes of DCP i-E curves and limiting currents decrease during amperometric titrations, as well as end points of amperometric and potentiometric titrations for each AO used as titrant proved the occurrence of Hg2+ reduction, either from complex (HPMC) or salt (HgCl2) solution. Constant H2O2 reduction current during amperometric titration of HPMC further confirmed the participation of Hg2+ as the oxidant species in reaction with AOs. The possibility of determining AO activity of flavonoids, phenolic acids, ascorbic acid and Trolox based on the decrease of Hg2+ reduction current was demonstrated. Strict correlation (R-2 = 0.96) between a new AO assay named MRAP (Mercury Reduction Antioxidant Power) and HPMC assay was found. Total AO capacity of real samples was measured by the proposed fast, simple and inexpensive MRAP assay as well. (C) 2015 Elsevier Ltd. All rights reserved.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Electrochimica Acta",
title = "DC polarographic examination of Hg2+ reduction applicability to antioxidant activity determination",
volume = "168",
pages = "240-245",
doi = "10.1016/j.electacta.2015.04.008"
}

Suznjevic, D. Z., Pastor, F.,& Gorjanović, S.. (2015). DC polarographic examination of Hg2+ reduction applicability to antioxidant activity determination. in Electrochimica Acta
Pergamon-Elsevier Science Ltd, Oxford., 168, 240-245.
https://doi.org/10.1016/j.electacta.2015.04.008

Suznjevic DZ, Pastor F, Gorjanović S. DC polarographic examination of Hg2+ reduction applicability to antioxidant activity determination. in Electrochimica Acta. 2015;168:240-245.
doi:10.1016/j.electacta.2015.04.008 .

Suznjevic, Desanka Z., Pastor, Ferenc, Gorjanović, Stanislava, "DC polarographic examination of Hg2+ reduction applicability to antioxidant activity determination" in Electrochimica Acta, 168 (2015):240-245,
https://doi.org/10.1016/j.electacta.2015.04.008 . .

TY  - JOUR
AU  - Gorjanović, Stanislava
AU  - Alvarez-Suarez, Jose Miguel
AU  - Novaković, Miroslav M.
AU  - Pastor, Ferenc
AU  - Pezo, Lato
AU  - Battino, Maurizio
AU  - Suznjevic, Desanka Z.
PY  - 2013
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1629
AB  - Hydrogen peroxide scavenging (HPS) activity of honey of different floral sources and its constituents such as predominant honey flavonoids, phenolic acids, amino and organic acids, and carbohydrates have been assessed by direct current (DC) polarographic assay. The assay was based on decrease of anodic current of hydrogen peroxide complex, formed in alkaline solution, at the potential of mercury dissolution. High correlations between honey HPS activity, its total phenolic content (FC-GAE), antioxidant activity measured by four standard methods (DPPH, TEAC, FRAP and ORAC), and also the relative antioxidant capacity index, were obtained. Statistical evaluation by ANOVA and F-test further confirmed the assay validity. The results for individual compounds showed that HPS activity of honey reflects an integrated action of a wide range of constituents, both phenolics and non-phenolics. The polarographic assay applied is a fast, reliable and low cost alternative to spectrophotometric antioxidant assays commonly applied in analysis of honey and can serve as an indicator of honey quality.
PB  - Academic Press Inc Elsevier Science, San Diego
T2  - Journal of Food Composition and Analysis
T1  - Comparative analysis of antioxidant activity of honey of different floral sources using recently developed polarographic and various spectrophotometric assays
VL  - 30
IS  - 1
SP  - 13
EP  - 18
DO  - 10.1016/j.jfca.2012.12.004
ER  - 

@article{
author = "Gorjanović, Stanislava and Alvarez-Suarez, Jose Miguel and Novaković, Miroslav M. and Pastor, Ferenc and Pezo, Lato and Battino, Maurizio and Suznjevic, Desanka Z.",
year = "2013",
abstract = "Hydrogen peroxide scavenging (HPS) activity of honey of different floral sources and its constituents such as predominant honey flavonoids, phenolic acids, amino and organic acids, and carbohydrates have been assessed by direct current (DC) polarographic assay. The assay was based on decrease of anodic current of hydrogen peroxide complex, formed in alkaline solution, at the potential of mercury dissolution. High correlations between honey HPS activity, its total phenolic content (FC-GAE), antioxidant activity measured by four standard methods (DPPH, TEAC, FRAP and ORAC), and also the relative antioxidant capacity index, were obtained. Statistical evaluation by ANOVA and F-test further confirmed the assay validity. The results for individual compounds showed that HPS activity of honey reflects an integrated action of a wide range of constituents, both phenolics and non-phenolics. The polarographic assay applied is a fast, reliable and low cost alternative to spectrophotometric antioxidant assays commonly applied in analysis of honey and can serve as an indicator of honey quality.",
publisher = "Academic Press Inc Elsevier Science, San Diego",
journal = "Journal of Food Composition and Analysis",
title = "Comparative analysis of antioxidant activity of honey of different floral sources using recently developed polarographic and various spectrophotometric assays",
volume = "30",
number = "1",
pages = "13-18",
doi = "10.1016/j.jfca.2012.12.004"
}

Gorjanović, S., Alvarez-Suarez, J. M., Novaković, M. M., Pastor, F., Pezo, L., Battino, M.,& Suznjevic, D. Z.. (2013). Comparative analysis of antioxidant activity of honey of different floral sources using recently developed polarographic and various spectrophotometric assays. in Journal of Food Composition and Analysis
Academic Press Inc Elsevier Science, San Diego., 30(1), 13-18.
https://doi.org/10.1016/j.jfca.2012.12.004

Gorjanović S, Alvarez-Suarez JM, Novaković MM, Pastor F, Pezo L, Battino M, Suznjevic DZ. Comparative analysis of antioxidant activity of honey of different floral sources using recently developed polarographic and various spectrophotometric assays. in Journal of Food Composition and Analysis. 2013;30(1):13-18.
doi:10.1016/j.jfca.2012.12.004 .

Gorjanović, Stanislava, Alvarez-Suarez, Jose Miguel, Novaković, Miroslav M., Pastor, Ferenc, Pezo, Lato, Battino, Maurizio, Suznjevic, Desanka Z., "Comparative analysis of antioxidant activity of honey of different floral sources using recently developed polarographic and various spectrophotometric assays" in Journal of Food Composition and Analysis, 30, no. 1 (2013):13-18,
https://doi.org/10.1016/j.jfca.2012.12.004 . .