TY  - JOUR
AU  - Vidović, Marija
AU  - Morina, Filis
AU  - Milic, Sonja
AU  - Albert, Andreas
AU  - Zechmann, Bernd
AU  - Tosti, Tomislav
AU  - Winkler, Jana Barbro
AU  - Veljović-Jovanović, Sonja
PY  - 2015
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1727
AB  - We studied the specific effects of high photosynthetically active radiation (PAR, 400-700 nm) and ecologically relevant UV-B radiation (0.90 W m(-2)) on antioxidative and phenolic metabolism by exploiting the green-white leaf variegation of Pelargonium zonale plants. This is a suitable model system for examining "source-sink" interactions within the same leaf. High PAR intensity (1350 mu mol m(-2) s(-1)) and UV-B radiation induced different responses in green and white leaf sectors. High PAR intensity had a greater influence on green tissue, triggering the accumulation of phenylpropanoids and flavonoids with strong antioxidative function. Induced phenolics, together with ascorbate, ascorbate peroxidase (APX, EC 1.11.1.11) and catalase (CAT, EC 1.11.1.6) provided efficient defense against potential oxidative pressure. UV-B-induced up-regulation of non-phenolic H2O2 scavengers in green leaf sectors was greater than high PAR-induced changes, indicating a UV-B role in antioxidative defense under light excess; on the contrary, minimal effects were observed in white tissue. However, UV-B radiation had greater influence on phenolics in white leaf sections compared to green ones, inducing accumulation of phenolic glycosides whose function was UV-B screening rather than antioxidative. By stimulation of starch and sucrose breakdown and carbon allocation in the form of soluble sugars from "source" (green) tissue to "sink" (white) tissue, UV-B radiation compensated the absence of photosynthetic activity and phenylpropanoid and flavonoid biosynthesis in white sectors. (C) 2015 Elsevier Masson SAS. All rights reserved.
PB  - Elsevier France-Editions Scientifiques Medicales Elsevier, Paris
T2  - Plant Physiology and Biochemistry
T1  - Carbon allocation from source to sink leaf tissue in relation to flavonoid biosynthesis in variegated Pelargonium zonale under UV-B radiation and high PAR intensity
VL  - 93
SP  - 44
EP  - 55
DO  - 10.1016/j.plaphy.2015.01.008
ER  - 

@article{
author = "Vidović, Marija and Morina, Filis and Milic, Sonja and Albert, Andreas and Zechmann, Bernd and Tosti, Tomislav and Winkler, Jana Barbro and Veljović-Jovanović, Sonja",
year = "2015",
abstract = "We studied the specific effects of high photosynthetically active radiation (PAR, 400-700 nm) and ecologically relevant UV-B radiation (0.90 W m(-2)) on antioxidative and phenolic metabolism by exploiting the green-white leaf variegation of Pelargonium zonale plants. This is a suitable model system for examining "source-sink" interactions within the same leaf. High PAR intensity (1350 mu mol m(-2) s(-1)) and UV-B radiation induced different responses in green and white leaf sectors. High PAR intensity had a greater influence on green tissue, triggering the accumulation of phenylpropanoids and flavonoids with strong antioxidative function. Induced phenolics, together with ascorbate, ascorbate peroxidase (APX, EC 1.11.1.11) and catalase (CAT, EC 1.11.1.6) provided efficient defense against potential oxidative pressure. UV-B-induced up-regulation of non-phenolic H2O2 scavengers in green leaf sectors was greater than high PAR-induced changes, indicating a UV-B role in antioxidative defense under light excess; on the contrary, minimal effects were observed in white tissue. However, UV-B radiation had greater influence on phenolics in white leaf sections compared to green ones, inducing accumulation of phenolic glycosides whose function was UV-B screening rather than antioxidative. By stimulation of starch and sucrose breakdown and carbon allocation in the form of soluble sugars from "source" (green) tissue to "sink" (white) tissue, UV-B radiation compensated the absence of photosynthetic activity and phenylpropanoid and flavonoid biosynthesis in white sectors. (C) 2015 Elsevier Masson SAS. All rights reserved.",
publisher = "Elsevier France-Editions Scientifiques Medicales Elsevier, Paris",
journal = "Plant Physiology and Biochemistry",
title = "Carbon allocation from source to sink leaf tissue in relation to flavonoid biosynthesis in variegated Pelargonium zonale under UV-B radiation and high PAR intensity",
volume = "93",
pages = "44-55",
doi = "10.1016/j.plaphy.2015.01.008"
}

Vidović, M., Morina, F., Milic, S., Albert, A., Zechmann, B., Tosti, T., Winkler, J. B.,& Veljović-Jovanović, S.. (2015). Carbon allocation from source to sink leaf tissue in relation to flavonoid biosynthesis in variegated Pelargonium zonale under UV-B radiation and high PAR intensity. in Plant Physiology and Biochemistry
Elsevier France-Editions Scientifiques Medicales Elsevier, Paris., 93, 44-55.
https://doi.org/10.1016/j.plaphy.2015.01.008

Vidović M, Morina F, Milic S, Albert A, Zechmann B, Tosti T, Winkler JB, Veljović-Jovanović S. Carbon allocation from source to sink leaf tissue in relation to flavonoid biosynthesis in variegated Pelargonium zonale under UV-B radiation and high PAR intensity. in Plant Physiology and Biochemistry. 2015;93:44-55.
doi:10.1016/j.plaphy.2015.01.008 .

Vidović, Marija, Morina, Filis, Milic, Sonja, Albert, Andreas, Zechmann, Bernd, Tosti, Tomislav, Winkler, Jana Barbro, Veljović-Jovanović, Sonja, "Carbon allocation from source to sink leaf tissue in relation to flavonoid biosynthesis in variegated Pelargonium zonale under UV-B radiation and high PAR intensity" in Plant Physiology and Biochemistry, 93 (2015):44-55,
https://doi.org/10.1016/j.plaphy.2015.01.008 . .

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 . .

TY  - JOUR
AU  - Milic, Sonja Z.
AU  - Potkonjak, Nebojsa I.
AU  - Gorjanović, Stanislava
AU  - Veljović-Jovanović, Sonja
AU  - Pastor, Ferenc
AU  - Sužnjević, Desanka
PY  - 2011
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1232
AB  - The behavior of chlorogenic acid (CGA) and its interaction with Hg(II), Pb(II), Cu(II), Cd(II) and Zn(II) has been studied using direct current (DC) and differential-pulse polarography (DPP). Adsorptive and kinetic/catalytic anodic waves of CGA have been detected at -0.02 and -0.18 V vs. SCE, respectively; Hg(I)-CGA surface disproportionation has been assumed. Reduction of Hg(II)-ions, added in the buffered solution of CGA (pH 7.5), occurs rather than complexation, while the complex forming ability of CGA towards Pb(II) and Cu(II) has been observed. Stoichiometry 1?:?1 for Pb(II)-CGA, and 1?:?1 and 1?:?2 for Cu(II)-CGA has been established applying Jobs method of continuous variation on DPP data. UV-vis spectrophotometric measurements additionally confirmed the existence and stoichiometry of Cu(II) complexes.
PB  - Wiley-Blackwell, Malden
T2  - Electroanalysis
T1  - A Polarographic Study of Chlorogenic Acid and Its Interaction with Some Heavy Metal Ions
VL  - 23
IS  - 12
SP  - 2935
EP  - 2940
DO  - 10.1002/elan.201100476
ER  - 

@article{
author = "Milic, Sonja Z. and Potkonjak, Nebojsa I. and Gorjanović, Stanislava and Veljović-Jovanović, Sonja and Pastor, Ferenc and Sužnjević, Desanka",
year = "2011",
abstract = "The behavior of chlorogenic acid (CGA) and its interaction with Hg(II), Pb(II), Cu(II), Cd(II) and Zn(II) has been studied using direct current (DC) and differential-pulse polarography (DPP). Adsorptive and kinetic/catalytic anodic waves of CGA have been detected at -0.02 and -0.18 V vs. SCE, respectively; Hg(I)-CGA surface disproportionation has been assumed. Reduction of Hg(II)-ions, added in the buffered solution of CGA (pH 7.5), occurs rather than complexation, while the complex forming ability of CGA towards Pb(II) and Cu(II) has been observed. Stoichiometry 1?:?1 for Pb(II)-CGA, and 1?:?1 and 1?:?2 for Cu(II)-CGA has been established applying Jobs method of continuous variation on DPP data. UV-vis spectrophotometric measurements additionally confirmed the existence and stoichiometry of Cu(II) complexes.",
publisher = "Wiley-Blackwell, Malden",
journal = "Electroanalysis",
title = "A Polarographic Study of Chlorogenic Acid and Its Interaction with Some Heavy Metal Ions",
volume = "23",
number = "12",
pages = "2935-2940",
doi = "10.1002/elan.201100476"
}

Milic, S. Z., Potkonjak, N. I., Gorjanović, S., Veljović-Jovanović, S., Pastor, F.,& Sužnjević, D.. (2011). A Polarographic Study of Chlorogenic Acid and Its Interaction with Some Heavy Metal Ions. in Electroanalysis
Wiley-Blackwell, Malden., 23(12), 2935-2940.
https://doi.org/10.1002/elan.201100476

Milic SZ, Potkonjak NI, Gorjanović S, Veljović-Jovanović S, Pastor F, Sužnjević D. A Polarographic Study of Chlorogenic Acid and Its Interaction with Some Heavy Metal Ions. in Electroanalysis. 2011;23(12):2935-2940.
doi:10.1002/elan.201100476 .

Milic, Sonja Z., Potkonjak, Nebojsa I., Gorjanović, Stanislava, Veljović-Jovanović, Sonja, Pastor, Ferenc, Sužnjević, Desanka, "A Polarographic Study of Chlorogenic Acid and Its Interaction with Some Heavy Metal Ions" in Electroanalysis, 23, no. 12 (2011):2935-2940,
https://doi.org/10.1002/elan.201100476 . .