TY  - JOUR
AU  - Ćirković, Dušica
AU  - Matijašević, Saša
AU  - Ćirković, Bratislav
AU  - Laketić, Darko
AU  - Jovanović, Zoran
AU  - Kostić, Boban
AU  - Bešlić, Zoran
AU  - Sredojević, Milica
AU  - Tešić, Živoslav Lj.
AU  - Banjanac, Tijana
AU  - Gašić, Uroš M.
PY  - 2022
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5317
AB  - The variety Prokupac is the dominant variety in the vineyards of Southern Serbia, which
produces quality wines of characteristic and unique tastes. In the agroecological conditions of the
Prokuplje vine district, the influence of manual defoliation on the phenolic profile of the wine
produced from the variety Prokupac was examined. Four experimental treatments with different
timings of manual defoliation were applied: early defoliation—treatment I, early defoliation—
treatment II, late defoliation—treatment III and the control. The phenolic profile of the wine
was determined for the three treatments of defoliation and the control treatment. Additionally,
a multivariate analysis was applied on the obtained results, together with already published data
(grape seeds and skins phenolic profiles). Identification and quantification of the phenolic compounds was performed using ultra-high-performance liquid chromatography (UHPLC) with an ultraviolet multi-diode detector (DAD) and mass detector with three analyzers—triple quadrupole (QQQ). Based on the obtained results, it was determined that there are significant differences between the experimental treatments in the content of individual polyphenols, total polyphenols and the antioxidant capacity. Twenty (20) phenolic compounds were identified in the wine samples of the experimental treatments. Defoliation significantly affected the variations of the contents of
phenolic acids and flavonoids. In treatment III, the highest content of gallic acid was obtained,
while the treatments with early defoliation did not differ in relation to the control sample. Early
defoliation in treatments I and II had an effect on the phenolic composition of the wine by favoring
the accumulation of flavonol, while the content of hydroxycinnamic acid and total anthocyanins
(TAC) was higher in treatment III. The TAC increases with later defoliation. The wines obtained by
the defoliation treatments did not show higher antioxidant activity compared to the control sample. A principal component analysis resulted in clustering of the samples based on the phenolic components characteristic for each group of samples.
PB  - MDPI
T2  - Horticulturae
T1  - Influence of Different Defoliation Timings on Quality and Phenolic Composition of the Wines Produced from the Serbian Autochthonous Variety Prokupac (Vitis vinifera L.)
VL  - 8
SP  - 296
DO  - 10.3390/horticulturae8040296
ER  - 

@article{
author = "Ćirković, Dušica and Matijašević, Saša and Ćirković, Bratislav and Laketić, Darko and Jovanović, Zoran and Kostić, Boban and Bešlić, Zoran and Sredojević, Milica and Tešić, Živoslav Lj. and Banjanac, Tijana and Gašić, Uroš M.",
year = "2022",
abstract = "The variety Prokupac is the dominant variety in the vineyards of Southern Serbia, which
produces quality wines of characteristic and unique tastes. In the agroecological conditions of the
Prokuplje vine district, the influence of manual defoliation on the phenolic profile of the wine
produced from the variety Prokupac was examined. Four experimental treatments with different
timings of manual defoliation were applied: early defoliation—treatment I, early defoliation—
treatment II, late defoliation—treatment III and the control. The phenolic profile of the wine
was determined for the three treatments of defoliation and the control treatment. Additionally,
a multivariate analysis was applied on the obtained results, together with already published data
(grape seeds and skins phenolic profiles). Identification and quantification of the phenolic compounds was performed using ultra-high-performance liquid chromatography (UHPLC) with an ultraviolet multi-diode detector (DAD) and mass detector with three analyzers—triple quadrupole (QQQ). Based on the obtained results, it was determined that there are significant differences between the experimental treatments in the content of individual polyphenols, total polyphenols and the antioxidant capacity. Twenty (20) phenolic compounds were identified in the wine samples of the experimental treatments. Defoliation significantly affected the variations of the contents of
phenolic acids and flavonoids. In treatment III, the highest content of gallic acid was obtained,
while the treatments with early defoliation did not differ in relation to the control sample. Early
defoliation in treatments I and II had an effect on the phenolic composition of the wine by favoring
the accumulation of flavonol, while the content of hydroxycinnamic acid and total anthocyanins
(TAC) was higher in treatment III. The TAC increases with later defoliation. The wines obtained by
the defoliation treatments did not show higher antioxidant activity compared to the control sample. A principal component analysis resulted in clustering of the samples based on the phenolic components characteristic for each group of samples.",
publisher = "MDPI",
journal = "Horticulturae",
title = "Influence of Different Defoliation Timings on Quality and Phenolic Composition of the Wines Produced from the Serbian Autochthonous Variety Prokupac (Vitis vinifera L.)",
volume = "8",
pages = "296",
doi = "10.3390/horticulturae8040296"
}

Ćirković, D., Matijašević, S., Ćirković, B., Laketić, D., Jovanović, Z., Kostić, B., Bešlić, Z., Sredojević, M., Tešić, Ž. Lj., Banjanac, T.,& Gašić, U. M.. (2022). Influence of Different Defoliation Timings on Quality and Phenolic Composition of the Wines Produced from the Serbian Autochthonous Variety Prokupac (Vitis vinifera L.). in Horticulturae
MDPI., 8, 296.
https://doi.org/10.3390/horticulturae8040296

Ćirković D, Matijašević S, Ćirković B, Laketić D, Jovanović Z, Kostić B, Bešlić Z, Sredojević M, Tešić ŽL, Banjanac T, Gašić UM. Influence of Different Defoliation Timings on Quality and Phenolic Composition of the Wines Produced from the Serbian Autochthonous Variety Prokupac (Vitis vinifera L.). in Horticulturae. 2022;8:296.
doi:10.3390/horticulturae8040296 .

Ćirković, Dušica, Matijašević, Saša, Ćirković, Bratislav, Laketić, Darko, Jovanović, Zoran, Kostić, Boban, Bešlić, Zoran, Sredojević, Milica, Tešić, Živoslav Lj., Banjanac, Tijana, Gašić, Uroš M., "Influence of Different Defoliation Timings on Quality and Phenolic Composition of the Wines Produced from the Serbian Autochthonous Variety Prokupac (Vitis vinifera L.)" in Horticulturae, 8 (2022):296,
https://doi.org/10.3390/horticulturae8040296 . .

TY  - JOUR
AU  - Ćirković, Dušica
AU  - Matijašević, Saša
AU  - Deletić, Nebojša
AU  - Ćirković, Bratislav
AU  - Gašić, Uroš M.
AU  - Sredojević, Milica
AU  - Jovanović, Zoran
AU  - Đurić, Vladan
AU  - Tešić, Živoslav Lj.
PY  - 2019
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3800
AB  - The influence of leaf area and various variants of manual defoliation on the phenolic profile of the Prokupac variety grape berry were investigated in the agroecological conditions of southern Serbia. The following four trial variants of manual defoliation were assessed: Early defoliation—variant I (flowering stage, 50% open flowers); early defoliation—variant II (grape size 3–5 mm); late defoliation—variant III (onset of grape ripening, veraison); and control (no defoliation). The first six leaves of each primary shoot were removed from all defoliated vines. The greatest assimilation area of primary and lateral shoots during the study was observed in the control, i.e., the trial variant with no defoliation. Defoliation significantly decreased the grape yield of the all three defoliated variants in regard to the control. The phenolic profile of the three variants and control was established by analyzing the grape seeds and skin. Based on the collected results for the Prokupac variety, significant differences between the trial variants were established regarding the content of phenols and total polyphenols, as well as radical scavenging activity. Defoliation variants showed a significant effect on the total phenols content of grape skin. In all defoliation variants, as well as in the control, high amounts of ellagic acid were measured. Resveratrol was identified only in grape skin samples of the control variant. The removal of leaves increased the concentration of phenolic compounds in variants where early defoliation was applied. The highest total anthocyanins content was found in 2015 in variant I, where leaves were removed during the full flowering stage.
PB  - MDPI
T2  - Agronomy
T1  - The Effect of Early and Late Defoliation on Phenolic Composition and Antioxidant Properties of Prokupac Variety Grape Berries (Vitis vinifera L.)
VL  - 9
IS  - 12
SP  - 822
DO  - 10.3390/agronomy9120822
ER  - 

@article{
author = "Ćirković, Dušica and Matijašević, Saša and Deletić, Nebojša and Ćirković, Bratislav and Gašić, Uroš M. and Sredojević, Milica and Jovanović, Zoran and Đurić, Vladan and Tešić, Živoslav Lj.",
year = "2019",
abstract = "The influence of leaf area and various variants of manual defoliation on the phenolic profile of the Prokupac variety grape berry were investigated in the agroecological conditions of southern Serbia. The following four trial variants of manual defoliation were assessed: Early defoliation—variant I (flowering stage, 50% open flowers); early defoliation—variant II (grape size 3–5 mm); late defoliation—variant III (onset of grape ripening, veraison); and control (no defoliation). The first six leaves of each primary shoot were removed from all defoliated vines. The greatest assimilation area of primary and lateral shoots during the study was observed in the control, i.e., the trial variant with no defoliation. Defoliation significantly decreased the grape yield of the all three defoliated variants in regard to the control. The phenolic profile of the three variants and control was established by analyzing the grape seeds and skin. Based on the collected results for the Prokupac variety, significant differences between the trial variants were established regarding the content of phenols and total polyphenols, as well as radical scavenging activity. Defoliation variants showed a significant effect on the total phenols content of grape skin. In all defoliation variants, as well as in the control, high amounts of ellagic acid were measured. Resveratrol was identified only in grape skin samples of the control variant. The removal of leaves increased the concentration of phenolic compounds in variants where early defoliation was applied. The highest total anthocyanins content was found in 2015 in variant I, where leaves were removed during the full flowering stage.",
publisher = "MDPI",
journal = "Agronomy",
title = "The Effect of Early and Late Defoliation on Phenolic Composition and Antioxidant Properties of Prokupac Variety Grape Berries (Vitis vinifera L.)",
volume = "9",
number = "12",
pages = "822",
doi = "10.3390/agronomy9120822"
}

Ćirković, D., Matijašević, S., Deletić, N., Ćirković, B., Gašić, U. M., Sredojević, M., Jovanović, Z., Đurić, V.,& Tešić, Ž. Lj.. (2019). The Effect of Early and Late Defoliation on Phenolic Composition and Antioxidant Properties of Prokupac Variety Grape Berries (Vitis vinifera L.). in Agronomy
MDPI., 9(12), 822.
https://doi.org/10.3390/agronomy9120822

Ćirković D, Matijašević S, Deletić N, Ćirković B, Gašić UM, Sredojević M, Jovanović Z, Đurić V, Tešić ŽL. The Effect of Early and Late Defoliation on Phenolic Composition and Antioxidant Properties of Prokupac Variety Grape Berries (Vitis vinifera L.). in Agronomy. 2019;9(12):822.
doi:10.3390/agronomy9120822 .

Ćirković, Dušica, Matijašević, Saša, Deletić, Nebojša, Ćirković, Bratislav, Gašić, Uroš M., Sredojević, Milica, Jovanović, Zoran, Đurić, Vladan, Tešić, Živoslav Lj., "The Effect of Early and Late Defoliation on Phenolic Composition and Antioxidant Properties of Prokupac Variety Grape Berries (Vitis vinifera L.)" in Agronomy, 9, no. 12 (2019):822,
https://doi.org/10.3390/agronomy9120822 . .