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Effects of defoliation on antioxidative and antibacterial activity of grape skin extracts of Merlot and Blaufränkisch (Vitis vinifera L.)


Pavić, Valentina; Kopić, Marina; Drenjančević, Mato
Effects of defoliation on antioxidative and antibacterial activity of grape skin extracts of Merlot and Blaufränkisch (Vitis vinifera L.) // Book of abstracts 17th Ružička days "Today Science-Tomorrow Industry / Tomas, Srećko ; Ačkar, Đurđica (ur.).
Osijek, 2018. str. 103-103 (poster, međunarodna recenzija, sažetak, ostalo)


Naslov
Effects of defoliation on antioxidative and antibacterial activity of grape skin extracts of Merlot and Blaufränkisch (Vitis vinifera L.)

Autori
Pavić, Valentina ; Kopić, Marina ; Drenjančević, Mato

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
Book of abstracts 17th Ružička days "Today Science-Tomorrow Industry / Tomas, Srećko ; Ačkar, Đurđica - Osijek, 2018, 103-103

ISBN
978-953-7005-57-3

Skup
International conference 17th Ružička days "Today Science-Tomorrow Industry"

Mjesto i datum
Vukovar, Hrvatska,, 19-21.09.2018

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Defoliation ; Blaufränkisch ; Merlot ; antioxidative and antibacterial activity ; phenols

Sažetak
Defoliation is a standard vineyard method with aim to achieve better ripening of grapes, breathability, better protection from various diseases like grey mold and better development of shoots. Process of defoliation can be implemented in different terms. The purpose of this study was to determine the effect of different terms of defoliation on antioxidative and antibacterial activity of grape skin ethanol extracts of Blaufränkisch and Merlot (Vitis vinifera L.). Total concentration of phenolic compounds, antioxidative activity and antibacterial activity on Gram-positive and Gram-negative human pathogens have been determined. The study was conducted on three treatments (control treatment – no defoliation, defoliation immediately after pre-bloom and defoliation before the start of veraison phase) and three repetitions. The results showed statistically significant enhancement of total phenolic compounds as well as antioxidative activity at both studied cultivars. Treatment of defoliation immediately after pre-bloom in the Blaufränkisch variety was more successful, resulted in higher concentrations of total phenols in grape skin extract compared to the defoliation treatment before the start of veraison phase. Treatment of defoliation immediately after pre-bloom in the Merlot variety was more successful than the treatment of defoliation before the start of veraison phase, resulted in significantly higher antioxidant activity of grape skin extracts. Antibacterial activity was increased only in extracts of Blaufränkisch.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Poljoprivreda (agronomija)



POVEZANOST RADA


Ustanove
Fakultet agrobiotehničkih znanosti Osijek,
Sveučilište u Osijeku - Odjel za biologiju