TY  - JOUR
AU  - Karaman, Maja
AU  - Tesanovic, Kristina
AU  - Gorjanovic, Stanislava
AU  - Pastor, Ferenc
AU  - Simonovic, Mladen
AU  - Glumac, Miodrag
AU  - Pejin, Boris
PY  - 2021
UR  - http://www.ncbi.nlm.nih.gov/pubmed/31192702
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/4773
AB  - This study was focused on in vitro screening of the total antioxidant activity of the selected extracts of the mushroom Coprinus comatus and quinic acid, one of their antidiabetic ingredients, by an uncommon electrochemical assay. Indeed, direct current (DC) polarographic HydroxoPerhydroxo Mercury(II) Complex (HPMC) assay based on decrease of anodic limiting current originating from HPMC formation in alkaline solutions of hydrogen peroxide at potential of mercury dissolution, observed upon gradual addition of antioxidants, was applied herein for the estimation of the natural products' antioxidativity. Quinic acid was found to exhibit most promising antioxidant potential (4.0 ± 0.2%µL-1) being ≈ 2-fold more active than the screened C. comatus extract samples. Actually, such a finding puts some light on the antioxidativity of cyclic polyols, well understimated class of organic compounds, compared to aromatic (poly)phenolics. As a low cost, easy-to handle and accurate this polarographic assay may be thoroughly recommended for much broader use. [Formula: see text].
T2  - Natural Product Research
T1  - Polarography as a technique of choice for the evaluation of total antioxidant activity: The case study of selected Coprinus Comatus extracts and quinic acid, their antidiabetic ingredient
VL  - 35
IS  - 10
SP  - 1711
EP  - 1716
DO  - 10.1080/14786419.2019.1628753
ER  - 

@article{
author = "Karaman, Maja and Tesanovic, Kristina and Gorjanovic, Stanislava and Pastor, Ferenc and Simonovic, Mladen and Glumac, Miodrag and Pejin, Boris",
year = "2021",
abstract = "This study was focused on in vitro screening of the total antioxidant activity of the selected extracts of the mushroom Coprinus comatus and quinic acid, one of their antidiabetic ingredients, by an uncommon electrochemical assay. Indeed, direct current (DC) polarographic HydroxoPerhydroxo Mercury(II) Complex (HPMC) assay based on decrease of anodic limiting current originating from HPMC formation in alkaline solutions of hydrogen peroxide at potential of mercury dissolution, observed upon gradual addition of antioxidants, was applied herein for the estimation of the natural products' antioxidativity. Quinic acid was found to exhibit most promising antioxidant potential (4.0 ± 0.2%µL-1) being ≈ 2-fold more active than the screened C. comatus extract samples. Actually, such a finding puts some light on the antioxidativity of cyclic polyols, well understimated class of organic compounds, compared to aromatic (poly)phenolics. As a low cost, easy-to handle and accurate this polarographic assay may be thoroughly recommended for much broader use. [Formula: see text].",
journal = "Natural Product Research",
title = "Polarography as a technique of choice for the evaluation of total antioxidant activity: The case study of selected Coprinus Comatus extracts and quinic acid, their antidiabetic ingredient",
volume = "35",
number = "10",
pages = "1711-1716",
doi = "10.1080/14786419.2019.1628753"
}

Karaman, M., Tesanovic, K., Gorjanovic, S., Pastor, F., Simonovic, M., Glumac, M.,& Pejin, B.. (2021). Polarography as a technique of choice for the evaluation of total antioxidant activity: The case study of selected Coprinus Comatus extracts and quinic acid, their antidiabetic ingredient. in Natural Product Research, 35(10), 1711-1716.
https://doi.org/10.1080/14786419.2019.1628753

Karaman M, Tesanovic K, Gorjanovic S, Pastor F, Simonovic M, Glumac M, Pejin B. Polarography as a technique of choice for the evaluation of total antioxidant activity: The case study of selected Coprinus Comatus extracts and quinic acid, their antidiabetic ingredient. in Natural Product Research. 2021;35(10):1711-1716.
doi:10.1080/14786419.2019.1628753 .

Karaman, Maja, Tesanovic, Kristina, Gorjanovic, Stanislava, Pastor, Ferenc, Simonovic, Mladen, Glumac, Miodrag, Pejin, Boris, "Polarography as a technique of choice for the evaluation of total antioxidant activity: The case study of selected Coprinus Comatus extracts and quinic acid, their antidiabetic ingredient" in Natural Product Research, 35, no. 10 (2021):1711-1716,
https://doi.org/10.1080/14786419.2019.1628753 . .

TY  - JOUR
AU  - Gorjanović, Stanislava
AU  - Pastor, Ferenc
AU  - Vasic, Radica
AU  - Novaković, Miroslav M.
AU  - Simonovic, Mladen
AU  - Milic, Sonja
AU  - Sužnjević, Desanka
PY  - 2013
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1491
AB  - Antioxidant (AO) activity of extracts of hop cones (Serbian domestic varieties) and commercial hop products (Saaz, Spalter, Spalter select, and Magnum pellets) was determined by parallel application of recently developed direct current (DC) polarographic and widely used DPPH assay. Correlations between 2,2-diphenyl-1-picrylhydrazyl radical (DPPH) scavenging and total phenolics (TPC) determined by the Folin-Ciocalteu assay (FC) (0.99), and between H2O2 scavenging,: (HPS) and humulone content (H) determined by conductometric method (0.94), total resins (TR) (0.85), and hop storage index (HIS) (-0.90), were found statistically significant at p  lt  0.05 level while complete lack of HPS correlation with TPC and DPPH was observed. To obtain an insight into differences between results of AO assays applied, activity of individual compounds, prevalent hop phenolics, and bitter acids was determined. By far superior HPS activity of humulone was followed by catechin, quercetin, xanthohumol, lupulone, and rutin. In contrast, DPPH scavenging activity of phenolics (quercetin  gt  catechin  gt  rutin  gt  xantohumol) was found substantially higher than activity of bitter acids. According to ferric reducing antioxidant power (FRAP) and scavenging of 2,2-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS), higher AO activity was ascribed to phenolics, while almost neglecting humulone. Besides reliability, low cost, and an easy-to-handle procedure, an ability to recognize humulone as the major contributor of hop AO activity could allow DC polarographic assay to be applied in analysis of various hop-derived products.
PB  - Amer Chemical Soc, Washington
T2  - Journal of Agricultural and Food Chemistry
T1  - Electrochemical versus Spectrophotometric Assessment of Antioxidant Activity of Hop (Humulus lupulus L.) Products and Individual Compounds
VL  - 61
IS  - 38
SP  - 9089
EP  - 9096
DO  - 10.1021/jf401718z
ER  - 

@article{
author = "Gorjanović, Stanislava and Pastor, Ferenc and Vasic, Radica and Novaković, Miroslav M. and Simonovic, Mladen and Milic, Sonja and Sužnjević, Desanka",
year = "2013",
abstract = "Antioxidant (AO) activity of extracts of hop cones (Serbian domestic varieties) and commercial hop products (Saaz, Spalter, Spalter select, and Magnum pellets) was determined by parallel application of recently developed direct current (DC) polarographic and widely used DPPH assay. Correlations between 2,2-diphenyl-1-picrylhydrazyl radical (DPPH) scavenging and total phenolics (TPC) determined by the Folin-Ciocalteu assay (FC) (0.99), and between H2O2 scavenging,: (HPS) and humulone content (H) determined by conductometric method (0.94), total resins (TR) (0.85), and hop storage index (HIS) (-0.90), were found statistically significant at p  lt  0.05 level while complete lack of HPS correlation with TPC and DPPH was observed. To obtain an insight into differences between results of AO assays applied, activity of individual compounds, prevalent hop phenolics, and bitter acids was determined. By far superior HPS activity of humulone was followed by catechin, quercetin, xanthohumol, lupulone, and rutin. In contrast, DPPH scavenging activity of phenolics (quercetin  gt  catechin  gt  rutin  gt  xantohumol) was found substantially higher than activity of bitter acids. According to ferric reducing antioxidant power (FRAP) and scavenging of 2,2-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS), higher AO activity was ascribed to phenolics, while almost neglecting humulone. Besides reliability, low cost, and an easy-to-handle procedure, an ability to recognize humulone as the major contributor of hop AO activity could allow DC polarographic assay to be applied in analysis of various hop-derived products.",
publisher = "Amer Chemical Soc, Washington",
journal = "Journal of Agricultural and Food Chemistry",
title = "Electrochemical versus Spectrophotometric Assessment of Antioxidant Activity of Hop (Humulus lupulus L.) Products and Individual Compounds",
volume = "61",
number = "38",
pages = "9089-9096",
doi = "10.1021/jf401718z"
}

Gorjanović, S., Pastor, F., Vasic, R., Novaković, M. M., Simonovic, M., Milic, S.,& Sužnjević, D.. (2013). Electrochemical versus Spectrophotometric Assessment of Antioxidant Activity of Hop (Humulus lupulus L.) Products and Individual Compounds. in Journal of Agricultural and Food Chemistry
Amer Chemical Soc, Washington., 61(38), 9089-9096.
https://doi.org/10.1021/jf401718z

Gorjanović S, Pastor F, Vasic R, Novaković MM, Simonovic M, Milic S, Sužnjević D. Electrochemical versus Spectrophotometric Assessment of Antioxidant Activity of Hop (Humulus lupulus L.) Products and Individual Compounds. in Journal of Agricultural and Food Chemistry. 2013;61(38):9089-9096.
doi:10.1021/jf401718z .

Gorjanović, Stanislava, Pastor, Ferenc, Vasic, Radica, Novaković, Miroslav M., Simonovic, Mladen, Milic, Sonja, Sužnjević, Desanka, "Electrochemical versus Spectrophotometric Assessment of Antioxidant Activity of Hop (Humulus lupulus L.) Products and Individual Compounds" in Journal of Agricultural and Food Chemistry, 61, no. 38 (2013):9089-9096,
https://doi.org/10.1021/jf401718z . .