Mato Drenjancevic - Profile on Academia.edu (original) (raw)
Papers by Mato Drenjancevic
Molecules, Jul 3, 2019
Vitis vinifera L. has been highlighted by its many positive effects on human health, including an... more Vitis vinifera L. has been highlighted by its many positive effects on human health, including antibacterial, anti-inflammatory and antioxidant activity due to its rich phytochemical content. Removing six basal leaves has great potential to influence the production of phytochemicals. The purpose of this study was to determine the impact of different terms of defoliation on the antioxidant and antibacterial activity of grape skin extracts of the Blaufränkisch and Merlot varieties. The total phenolic concentration, total and individual anthocyanin concentration, antioxidant activity and antibacterial activity on gram-positive and gram-negative human pathogens have been determined. The study was conducted on three treatments (control treatment without defoliation, defoliation immediately after bloom and defoliation before the start of the véraison phase). The results showed statistically significant enhancement of the total phenolic concentration as well as the antioxidant and antibacterial activity in both studied cultivars. Defoliation just after blooming was the preferable defoliation term in the Merlot variety for achieving the highest total anthocyanin concentration, antioxidant activity and significant increase of antibacterial activity against all four investigated bacteria. Defoliation before the start of the véraison phase was the preferable defoliation term for achieving the highest total anthocyanin concentration in the Blaufränkisch variety. In general, treatment of defoliation immediately after bloom was more beneficial compared with the defoliation before the start of the véraison phase.
Poljoprivreda (Osijek), Dec 20, 2013
Antioxidants, May 11, 2022
The vasodilatory activity and polyphenolic content of commercially available white wine is low co... more The vasodilatory activity and polyphenolic content of commercially available white wine is low compared to red wines. This study assessed the vasodilator potential of white wines produced by four different fermentation processes: (1) white wine produced by the standard procedure; (2) grapes left to macerate completely for 30 days; (3) grapes left to macerate up to half of unfermented sugar; and (4) wine produced by cooling the must. All tested wine samples were analyzed for their phenolic content, antioxidant capacity, and ethanol content. Vasodilation was examined in the norepinephrine pre-contracted isolated rat aortas of male Sprague-Dawley rats randomly exposed to cumulative concentrations (0.1‰ to 8‰ final dilutions in organ baths) of each of the tested wine samples with or without quercetin and/or gallic acid supplementation, in the absence/presence of NOS inhibitor L-NAME. Standard procedure and the procedure involving must cooling gives wine with lower phenolic content, antioxidant capacity, and lower vasodilator potential, respectively. L-NAME inhibited vasodilation to all wine samples. Quercetin with or without gallic acid supplementation restored vasodilation. Results show that vasodilation to white wine is NO-dependent and suggest the possibility of increasing the antioxidant capacity and vasodilatory potential of white wine using different production procedures, depending on quercetin content.
Molecules, Jan 21, 2022
The aim of this study was to determine the effects of defoliation performed in the Babica red gra... more The aim of this study was to determine the effects of defoliation performed in the Babica red grape variety on the volatile compounds in produced wine. Three treatments were performed during 2017 and 2018: the removal of six leaves before flowering (FL) and at the end of veraison (VER), as well as control (C). Volatile compounds were analyzed using a gas chromatograph coupled to a mass spectrophotometric detector. Results were statistically evaluated by analysis of variance (ANOVA at the p = 0.05 level) and principal component analysis (PCA). Defoliation treatments were affected by the concentration of several compounds, but only in one year. The VER2017 treatment significantly increased the concentration of three aliphatic esters up to 8 C atoms and octanoic acid ethyl ester. The FL2017 treatment increased the concentration of three aliphatic alcohols. The FL2018 treatment has significantly enhanced the concentration ethyl cinnamate but decreased the concentrations of eugenol and dihydro-2-methyl-3(2H)-thiophenone. Both defoliation treatments reduced the concentration of γ-decanolactone in 2017. Aldehydes, monoterpenoles, and monoterpenes remained unaffected by the defoliation treatments. Vintage was found to be the largest source of variability for most volatile compounds under investigation, which was confirmed by PCA. The effect of defoliation in the mild-Mediterranean climate was found to mostly depend on seasonal weather conditions.
Mapping intensity and distribution of grapevine chlorosis
One of the main abiotic stresses is the lack of microelements which influences the growth and dev... more One of the main abiotic stresses is the lack of microelements which influences the growth and development of grapevine cultivated on high pH value carbonated soil. Chlorosis phenomenon often appears in the vine-growing Podunavlje sub-region on carbonated soil with loess being the main substrate. It often appears due to a lack of plant nourishing elements in the soil, or because of their inactivation. The aim of this research was to determine the intensity and the space distribution of different chlorosis types on the grapevine by mapping using chlorophyll meter and GPS as well as chlorosis degree (where the estimating scale of chlorosis ranged 0-5), and to visualise the data by GIS technology. High ratio of relative chlorosis was determined on the researched area. It was found out by the microelements deficit, mostly iron.
Mogućnosti kemijskog prorjeđivanja breskve i nektarine
![Research paper thumbnail of Effect of plant spacing and nitorgen fertilization on the yield of some chokeberry cultivars (Aronia melanocarpa [Michx] Elliot)](https://attachments.academia-assets.com/120416209/thumbnails/1.jpg)
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Dinamika nakupljanja antocijana i ukupnih fenola u bobicama sorti Probus i Kaberne sovinjon tokom sazrevanja u uslovima Fruške Gore
The anthocyanin and total phenols concentrations of Vitis vinifera cv Probus (Serbian wine grape ... more The anthocyanin and total phenols concentrations of Vitis vinifera cv Probus (Serbian wine grape variety) and Cabernet Sauvignon, during ripening in Fruska Gora region, were investigated. Phenolic concentration was evaluated by spectrophotometric analysis. Probus had higher anthocyanins concentration in the skin and total phenols per berry. Cabernet Sauvignon did not show big enlargement in anthocyanins content during this period. Contrastingly, anthocyanins content in Probus berry skin was increasing until harvest. Small berries of cv. Probus had colored pulp. There was a decrease in the Cabernet Sauvignon berry weight near the harvest. Optimum moment to harvest Probus was 50 days after veraison. Overall, these two varieties showed differences in anthocyanins accumulation during ripening.Cilj rada bio je da se ispita dinamika nakupljanja antocijana i ukupnih fenola u bobicama sorti probus i kaberne sovinjon tokom sazrevanja. Praćen je sadržaj ovih jedinjenja od šarka do berbe, u vr...
Antioxidants
The vasodilatory activity and polyphenolic content of commercially available white wine is low co... more The vasodilatory activity and polyphenolic content of commercially available white wine is low compared to red wines. This study assessed the vasodilator potential of white wines produced by four different fermentation processes: (1) white wine produced by the standard procedure; (2) grapes left to macerate completely for 30 days; (3) grapes left to macerate up to half of unfermented sugar; and (4) wine produced by cooling the must. All tested wine samples were analyzed for their phenolic content, antioxidant capacity, and ethanol content. Vasodilation was examined in the norepinephrine pre-contracted isolated rat aortas of male Sprague-Dawley rats randomly exposed to cumulative concentrations (0.1‰ to 8‰ final dilutions in organ baths) of each of the tested wine samples with or without quercetin and/or gallic acid supplementation, in the absence/presence of NOS inhibitor L-NAME. Standard procedure and the procedure involving must cooling gives wine with lower phenolic content, anti...
The anthocyaninand total phenols concentrations of Vitis vinifera cv Probus (Serbian wine grape v... more The anthocyaninand total phenols concentrations of Vitis vinifera cv Probus (Serbian wine grape variety) and Cabernet Sauvignon, during ripening in Fruska Gora region, were investigated. Phenolic concentration was evaluated by spectrophotometric analysis. Probus had higher anthocyanins concentration in the skin and total phenols per berry. Cabernet Sauvignon did not show big enlargement in anthocyanins content during this period. Contrastingly, anthocyanins content in Probus berry skin was increasing until harvest. Small berries of cv. Probus had colored pulp. There was a decrease in the Cabernet Sauvignon berry weight near the harvest. Optimum moment to harvest Probus was 50 days after veraison. Overall, these two varieties showed differences in anthocyanins accumulation during ripening.
Poznavanje vina u segmentu mladih potrošača
Effects of cluster thinning and pruning methods on total phenols, total anthocyanins and antioxidant activity of vine grape
Energetska vrijednost i godišnji prirast drvne mase nekih kultivara vinove loze (Vitis vinifera L.) na različitim podlogama
![Research paper thumbnail of Effect of plant spacing and nitorgen fertilization on the yield of some chokeberry cultivars (Aronia melanocarpa [Michx] Elliot)](https://attachments.academia-assets.com/120416167/thumbnails/1.jpg)
](Aronija (Aronia melanocarpa [Michx]Elliot) je vocna vrsta koja nema dugu tradiciju uzgoja u Repub... more Aronija (Aronia melanocarpa [Michx]Elliot) je vocna vrsta koja nema dugu tradiciju uzgoja u Republici Hrvatskoj. Do sada se uzgajala gotovo iskljucivo na okucnicama, a tek u posljednje vrijeme podignuti su veci suvremeni nasadi ali na temelju iskustava proizvođaca iz drugih zemalja, razlicitih agroekoloskih uvjeta. Cilj istraživanja je bio ustanoviti razlike u prinosu između pojedinih sorata aronije (Viking, Nero i Galicijanka) te divljoj aroniji s obzirom na primjenu razlicitih razmaka sadnje (1 i 1, 5 m) i gnojidbu dusikom (0, 45 i 70 kg/ha) u proizvodnim uvjetima istocne Hrvatske u 2013. godini. Pokus je postavljen u proljece 2011. godine. Sve tri sorte aronije signifikantno su se razlikovale u prosjecnom prinosu po biljci u odnosu na divlju aroniju (0, 43 kg/biljci). Najvisi prosjecni prinos po biljci ostvaren je kod sorte Nero (1, 72 kg/biljci). Kod oba razmaka sadnje divlja aronija statisticki se znacajno razlikovala od ostalih sorata. Kod svih sorata postignut je znacajno vis...
OENO One, 2020
Aim: Leaf removal around clusters and cluster thinning are techniques usually applied in cool-cli... more Aim: Leaf removal around clusters and cluster thinning are techniques usually applied in cool-climate vineyards in order to achieve optimal grape maturity. However, the impact of the timing of these two operations differs across varieties. Thus, the aim of the present work was to investigate the effects of cluster thinning and leaf removal timing (performed at three specific time points) on grape quality and monomeric anthocyanins in the wines of Cabernet-Sauvignon and Probus (Kadarka × Cabernet-Sauvignon, Vitis vinifera L.)Methods and results: The experiment was conducted in Sremski Karlovci (Northern Serbia) in 2014, 2015, and 2016. Leaf removal was applied on six basal nodes of each shoot at three time points, 7 days after flowering, 30 days after flowering, and at veraison, i.e., at the onset of berry ripening. After cluster thinning, which was performed 7 days after flowering, one cluster per shoot was retained. On the treated vines, leaf removal treatment and cluster thinning ...
Acta Agriculturae Scandinavica, Section B — Soil & Plant Science, 2017
The aim of this study was to determine the impact of two different treatments of early defoliatio... more The aim of this study was to determine the impact of two different treatments of early defoliation performed before blooming on: grape yield, chemical parameters, polyphenols content, and antioxidant activity of grape and red wine cv. Cabernet Sauvignon from the vineyard located in Ilok, the eastern continental region of Croatia. Two different treatments of leaf removal (LR) were performed: removal of 3 leafs (T1) and 6 leafs (T2) before blooming, together with control (no leaf removal) (T3) during two years (2013 and 2014). Crop yield and average cluster weights per vine were determined. Density, pH and titratable acidity were measured in must, while the total phenols, total anthocyanins and antioxidant activity were measured in the extract of grape skin and produced wine. The analysis of individual anthocyanins in wine was performed by HPLC method. T2 treatment significantly lowered the crop yield and the average cluster weights, and increased total phenols, total anthocyanins, antioxidant activity and most abundant individual anthocyanins in wine. Defoliation did not affect the other chemical parameters in must, grape skin extract and wine. Vintage year is statistically the most significant source of variability for density of must, antioxidant activity in grape skin extract, as well as pH and titratable acidity in wine. This study has showed that the early leaf removal treatment in eastern continental part of Croatia could be used for the production of smaller quantity of high quality Cabernet Sauvignon red wine abundant with anthocyanins.
Polyphenols, anthocyanins and antiradical activity of chokeberries
Electronic Journal of Environmental, Agricultural and Food Chemistry
In this study, differences in the bioactive polyphenolic substances between chokeberries (cultiva... more In this study, differences in the bioactive polyphenolic substances between chokeberries (cultivars “Nero”, “Viking”, “Galicianka” ; wild chokeberry) (Aronia melanocarpa) were examined. The results showed that there were some differences between investigated fruits according to the amount of polyphenols, anthocyanins, and the antiradical activity. Somewhat higher total polyphenol and total anthocyanin content were found in wild chokeberries and in cultivar “Nero”. Wild chokeberries and cultivar “Nero” showed stronger antiradical activity determined by the DPPH method. The phenolic compound distribution was similar in all chokeberries as well as their kinetic behavior in the free radical capturing.
Phenolic acids, flavonols, anthocyanins and antiradical activity of “Nero”, “Viking”, “Galicianka” and wild chokeberries
Scientia Horticulturae, 2012
ABSTRACT Chokeberries are a subject of numerous studies due to a high phenolic compound content, ... more ABSTRACT Chokeberries are a subject of numerous studies due to a high phenolic compound content, antioxidant properties and potential positive influence on the health. In this work, phenolic compounds and the antiradical activity of three chokeberry cultivars (“Nero”, “Viking”, “Galicianka”) and wild chokeberries were compared during two consecutive year. The phenolic compound profile determined by high performance liquid chromatography (HPLC) was the same in all chokeberries. But some differences were found in the content of phenolic compounds. The total phenol and total anthocyanin content was higher in cultivars “Viking” and “Nero”. Cultivar “Galicianka” had the lowest phenolic compound content. The flavonol content was similar in all chokeberries. Phenolic acid content was high in wild chokeberries and in cultivar “Viking”. The antiradical activity was the strongest in wild chokeberries and in cultivar “Viking”. Wild chokeberries differed from other investigated chokeberries by somewhat higher amount of phenolic acids which might affect their antiradical activity.
Molecules, Jul 3, 2019
Vitis vinifera L. has been highlighted by its many positive effects on human health, including an... more Vitis vinifera L. has been highlighted by its many positive effects on human health, including antibacterial, anti-inflammatory and antioxidant activity due to its rich phytochemical content. Removing six basal leaves has great potential to influence the production of phytochemicals. The purpose of this study was to determine the impact of different terms of defoliation on the antioxidant and antibacterial activity of grape skin extracts of the Blaufränkisch and Merlot varieties. The total phenolic concentration, total and individual anthocyanin concentration, antioxidant activity and antibacterial activity on gram-positive and gram-negative human pathogens have been determined. The study was conducted on three treatments (control treatment without defoliation, defoliation immediately after bloom and defoliation before the start of the véraison phase). The results showed statistically significant enhancement of the total phenolic concentration as well as the antioxidant and antibacterial activity in both studied cultivars. Defoliation just after blooming was the preferable defoliation term in the Merlot variety for achieving the highest total anthocyanin concentration, antioxidant activity and significant increase of antibacterial activity against all four investigated bacteria. Defoliation before the start of the véraison phase was the preferable defoliation term for achieving the highest total anthocyanin concentration in the Blaufränkisch variety. In general, treatment of defoliation immediately after bloom was more beneficial compared with the defoliation before the start of the véraison phase.
Poljoprivreda (Osijek), Dec 20, 2013
Antioxidants, May 11, 2022
The vasodilatory activity and polyphenolic content of commercially available white wine is low co... more The vasodilatory activity and polyphenolic content of commercially available white wine is low compared to red wines. This study assessed the vasodilator potential of white wines produced by four different fermentation processes: (1) white wine produced by the standard procedure; (2) grapes left to macerate completely for 30 days; (3) grapes left to macerate up to half of unfermented sugar; and (4) wine produced by cooling the must. All tested wine samples were analyzed for their phenolic content, antioxidant capacity, and ethanol content. Vasodilation was examined in the norepinephrine pre-contracted isolated rat aortas of male Sprague-Dawley rats randomly exposed to cumulative concentrations (0.1‰ to 8‰ final dilutions in organ baths) of each of the tested wine samples with or without quercetin and/or gallic acid supplementation, in the absence/presence of NOS inhibitor L-NAME. Standard procedure and the procedure involving must cooling gives wine with lower phenolic content, antioxidant capacity, and lower vasodilator potential, respectively. L-NAME inhibited vasodilation to all wine samples. Quercetin with or without gallic acid supplementation restored vasodilation. Results show that vasodilation to white wine is NO-dependent and suggest the possibility of increasing the antioxidant capacity and vasodilatory potential of white wine using different production procedures, depending on quercetin content.
Molecules, Jan 21, 2022
The aim of this study was to determine the effects of defoliation performed in the Babica red gra... more The aim of this study was to determine the effects of defoliation performed in the Babica red grape variety on the volatile compounds in produced wine. Three treatments were performed during 2017 and 2018: the removal of six leaves before flowering (FL) and at the end of veraison (VER), as well as control (C). Volatile compounds were analyzed using a gas chromatograph coupled to a mass spectrophotometric detector. Results were statistically evaluated by analysis of variance (ANOVA at the p = 0.05 level) and principal component analysis (PCA). Defoliation treatments were affected by the concentration of several compounds, but only in one year. The VER2017 treatment significantly increased the concentration of three aliphatic esters up to 8 C atoms and octanoic acid ethyl ester. The FL2017 treatment increased the concentration of three aliphatic alcohols. The FL2018 treatment has significantly enhanced the concentration ethyl cinnamate but decreased the concentrations of eugenol and dihydro-2-methyl-3(2H)-thiophenone. Both defoliation treatments reduced the concentration of γ-decanolactone in 2017. Aldehydes, monoterpenoles, and monoterpenes remained unaffected by the defoliation treatments. Vintage was found to be the largest source of variability for most volatile compounds under investigation, which was confirmed by PCA. The effect of defoliation in the mild-Mediterranean climate was found to mostly depend on seasonal weather conditions.
Mapping intensity and distribution of grapevine chlorosis
One of the main abiotic stresses is the lack of microelements which influences the growth and dev... more One of the main abiotic stresses is the lack of microelements which influences the growth and development of grapevine cultivated on high pH value carbonated soil. Chlorosis phenomenon often appears in the vine-growing Podunavlje sub-region on carbonated soil with loess being the main substrate. It often appears due to a lack of plant nourishing elements in the soil, or because of their inactivation. The aim of this research was to determine the intensity and the space distribution of different chlorosis types on the grapevine by mapping using chlorophyll meter and GPS as well as chlorosis degree (where the estimating scale of chlorosis ranged 0-5), and to visualise the data by GIS technology. High ratio of relative chlorosis was determined on the researched area. It was found out by the microelements deficit, mostly iron.
Mogućnosti kemijskog prorjeđivanja breskve i nektarine
Dinamika nakupljanja antocijana i ukupnih fenola u bobicama sorti Probus i Kaberne sovinjon tokom sazrevanja u uslovima Fruške Gore
The anthocyanin and total phenols concentrations of Vitis vinifera cv Probus (Serbian wine grape ... more The anthocyanin and total phenols concentrations of Vitis vinifera cv Probus (Serbian wine grape variety) and Cabernet Sauvignon, during ripening in Fruska Gora region, were investigated. Phenolic concentration was evaluated by spectrophotometric analysis. Probus had higher anthocyanins concentration in the skin and total phenols per berry. Cabernet Sauvignon did not show big enlargement in anthocyanins content during this period. Contrastingly, anthocyanins content in Probus berry skin was increasing until harvest. Small berries of cv. Probus had colored pulp. There was a decrease in the Cabernet Sauvignon berry weight near the harvest. Optimum moment to harvest Probus was 50 days after veraison. Overall, these two varieties showed differences in anthocyanins accumulation during ripening.Cilj rada bio je da se ispita dinamika nakupljanja antocijana i ukupnih fenola u bobicama sorti probus i kaberne sovinjon tokom sazrevanja. Praćen je sadržaj ovih jedinjenja od šarka do berbe, u vr...
Antioxidants
The vasodilatory activity and polyphenolic content of commercially available white wine is low co... more The vasodilatory activity and polyphenolic content of commercially available white wine is low compared to red wines. This study assessed the vasodilator potential of white wines produced by four different fermentation processes: (1) white wine produced by the standard procedure; (2) grapes left to macerate completely for 30 days; (3) grapes left to macerate up to half of unfermented sugar; and (4) wine produced by cooling the must. All tested wine samples were analyzed for their phenolic content, antioxidant capacity, and ethanol content. Vasodilation was examined in the norepinephrine pre-contracted isolated rat aortas of male Sprague-Dawley rats randomly exposed to cumulative concentrations (0.1‰ to 8‰ final dilutions in organ baths) of each of the tested wine samples with or without quercetin and/or gallic acid supplementation, in the absence/presence of NOS inhibitor L-NAME. Standard procedure and the procedure involving must cooling gives wine with lower phenolic content, anti...
The anthocyaninand total phenols concentrations of Vitis vinifera cv Probus (Serbian wine grape v... more The anthocyaninand total phenols concentrations of Vitis vinifera cv Probus (Serbian wine grape variety) and Cabernet Sauvignon, during ripening in Fruska Gora region, were investigated. Phenolic concentration was evaluated by spectrophotometric analysis. Probus had higher anthocyanins concentration in the skin and total phenols per berry. Cabernet Sauvignon did not show big enlargement in anthocyanins content during this period. Contrastingly, anthocyanins content in Probus berry skin was increasing until harvest. Small berries of cv. Probus had colored pulp. There was a decrease in the Cabernet Sauvignon berry weight near the harvest. Optimum moment to harvest Probus was 50 days after veraison. Overall, these two varieties showed differences in anthocyanins accumulation during ripening.
Poznavanje vina u segmentu mladih potrošača
Effects of cluster thinning and pruning methods on total phenols, total anthocyanins and antioxidant activity of vine grape
Energetska vrijednost i godišnji prirast drvne mase nekih kultivara vinove loze (Vitis vinifera L.) na različitim podlogama
Aronija (Aronia melanocarpa [Michx]Elliot) je vocna vrsta koja nema dugu tradiciju uzgoja u Repub... more Aronija (Aronia melanocarpa [Michx]Elliot) je vocna vrsta koja nema dugu tradiciju uzgoja u Republici Hrvatskoj. Do sada se uzgajala gotovo iskljucivo na okucnicama, a tek u posljednje vrijeme podignuti su veci suvremeni nasadi ali na temelju iskustava proizvođaca iz drugih zemalja, razlicitih agroekoloskih uvjeta. Cilj istraživanja je bio ustanoviti razlike u prinosu između pojedinih sorata aronije (Viking, Nero i Galicijanka) te divljoj aroniji s obzirom na primjenu razlicitih razmaka sadnje (1 i 1, 5 m) i gnojidbu dusikom (0, 45 i 70 kg/ha) u proizvodnim uvjetima istocne Hrvatske u 2013. godini. Pokus je postavljen u proljece 2011. godine. Sve tri sorte aronije signifikantno su se razlikovale u prosjecnom prinosu po biljci u odnosu na divlju aroniju (0, 43 kg/biljci). Najvisi prosjecni prinos po biljci ostvaren je kod sorte Nero (1, 72 kg/biljci). Kod oba razmaka sadnje divlja aronija statisticki se znacajno razlikovala od ostalih sorata. Kod svih sorata postignut je znacajno vis...
OENO One, 2020
Aim: Leaf removal around clusters and cluster thinning are techniques usually applied in cool-cli... more Aim: Leaf removal around clusters and cluster thinning are techniques usually applied in cool-climate vineyards in order to achieve optimal grape maturity. However, the impact of the timing of these two operations differs across varieties. Thus, the aim of the present work was to investigate the effects of cluster thinning and leaf removal timing (performed at three specific time points) on grape quality and monomeric anthocyanins in the wines of Cabernet-Sauvignon and Probus (Kadarka × Cabernet-Sauvignon, Vitis vinifera L.)Methods and results: The experiment was conducted in Sremski Karlovci (Northern Serbia) in 2014, 2015, and 2016. Leaf removal was applied on six basal nodes of each shoot at three time points, 7 days after flowering, 30 days after flowering, and at veraison, i.e., at the onset of berry ripening. After cluster thinning, which was performed 7 days after flowering, one cluster per shoot was retained. On the treated vines, leaf removal treatment and cluster thinning ...
Acta Agriculturae Scandinavica, Section B — Soil & Plant Science, 2017
The aim of this study was to determine the impact of two different treatments of early defoliatio... more The aim of this study was to determine the impact of two different treatments of early defoliation performed before blooming on: grape yield, chemical parameters, polyphenols content, and antioxidant activity of grape and red wine cv. Cabernet Sauvignon from the vineyard located in Ilok, the eastern continental region of Croatia. Two different treatments of leaf removal (LR) were performed: removal of 3 leafs (T1) and 6 leafs (T2) before blooming, together with control (no leaf removal) (T3) during two years (2013 and 2014). Crop yield and average cluster weights per vine were determined. Density, pH and titratable acidity were measured in must, while the total phenols, total anthocyanins and antioxidant activity were measured in the extract of grape skin and produced wine. The analysis of individual anthocyanins in wine was performed by HPLC method. T2 treatment significantly lowered the crop yield and the average cluster weights, and increased total phenols, total anthocyanins, antioxidant activity and most abundant individual anthocyanins in wine. Defoliation did not affect the other chemical parameters in must, grape skin extract and wine. Vintage year is statistically the most significant source of variability for density of must, antioxidant activity in grape skin extract, as well as pH and titratable acidity in wine. This study has showed that the early leaf removal treatment in eastern continental part of Croatia could be used for the production of smaller quantity of high quality Cabernet Sauvignon red wine abundant with anthocyanins.
Polyphenols, anthocyanins and antiradical activity of chokeberries
Electronic Journal of Environmental, Agricultural and Food Chemistry
In this study, differences in the bioactive polyphenolic substances between chokeberries (cultiva... more In this study, differences in the bioactive polyphenolic substances between chokeberries (cultivars “Nero”, “Viking”, “Galicianka” ; wild chokeberry) (Aronia melanocarpa) were examined. The results showed that there were some differences between investigated fruits according to the amount of polyphenols, anthocyanins, and the antiradical activity. Somewhat higher total polyphenol and total anthocyanin content were found in wild chokeberries and in cultivar “Nero”. Wild chokeberries and cultivar “Nero” showed stronger antiradical activity determined by the DPPH method. The phenolic compound distribution was similar in all chokeberries as well as their kinetic behavior in the free radical capturing.
Phenolic acids, flavonols, anthocyanins and antiradical activity of “Nero”, “Viking”, “Galicianka” and wild chokeberries
Scientia Horticulturae, 2012
ABSTRACT Chokeberries are a subject of numerous studies due to a high phenolic compound content, ... more ABSTRACT Chokeberries are a subject of numerous studies due to a high phenolic compound content, antioxidant properties and potential positive influence on the health. In this work, phenolic compounds and the antiradical activity of three chokeberry cultivars (“Nero”, “Viking”, “Galicianka”) and wild chokeberries were compared during two consecutive year. The phenolic compound profile determined by high performance liquid chromatography (HPLC) was the same in all chokeberries. But some differences were found in the content of phenolic compounds. The total phenol and total anthocyanin content was higher in cultivars “Viking” and “Nero”. Cultivar “Galicianka” had the lowest phenolic compound content. The flavonol content was similar in all chokeberries. Phenolic acid content was high in wild chokeberries and in cultivar “Viking”. The antiradical activity was the strongest in wild chokeberries and in cultivar “Viking”. Wild chokeberries differed from other investigated chokeberries by somewhat higher amount of phenolic acids which might affect their antiradical activity.