Naslov
Screening of 21 Vitis vinifera L. leaf and grape skin extracts for antioxidant capacity and phenolic content

Autori
Generalić, Ivana ; Skroza, Danijela ; Bosančić, Marija ; Martinović, Sanja ; Skračić, Živko ; Katalinić, Višnja

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

Izvornik
5 th Central European Congress on Food 19th-22nd May 2010, Bratislava, Slovak Republic, Book of Abstract / - Bratislava : Food Research Institute, 2010, 73-73

ISBN
978-80-89088-90-4

Skup
5 th Central European Congress on Food

Mjesto i datum
Bratislava, Slovačka, 19.05.2010. - 22.05.2010

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Vitis vinifera; grape skin; grape leaf; phenolics; antioxidants

Sažetak
Polyphenols are of secondary plant metabolites, naturally present in fruit, vegetables and herbs. In last two decades the number of publications on the potential health benefits of these compounds has increased enormously. The aim of this study is to determine and compare polyphenolic profile and related antioxidative properties of Vitis vinifera leaf and grape berry skin extracts. The research includes 21 grape varieties (White: Bogdanuša, Debit, Grk, Kuč, Malvasija, Maraština, Medna, Prč, Pošip, Trebbiano toscano, Vugava and Žlahtina ; Red: Babica, Babić, Cabernet sauvignon, Dobričić, Glavinuša, Ninčuša, Plavac mali, Plavina and Vranac). Plant material was collected at the stage of the grape technological maturity. Phenolic profile of plant extracts (total phenols, flavonoids, non-flavonoids, catechins and flavanols) were determined using spectrophotometric methods. Antioxidant capacity of plant extracts was estimated by Ferric Reducing/Antioxidant Power (FRAP) assay. The research of polyphenolic profile of berry skin and grape leaves extracts has shown difference in the mass amounts of total phenols among selected grape cultivars, as expected. The high antioxidant capacity of tested extracts has been observed and related to the presence of a mixture of polyphenolic compounds with good antioxidant properties. Significant linear correlation between total phenol content, or main phenolic subgroups, and FRAP was confirmed. To make practical comparison of relative antioxidant potential of phenolics extracted from berry skins and grape leaves, the phenol antioxidant coefficient (PAC) was calculated for each extract. PAC values ranged from 4.54-13.05 for grape skin extracts, and from 8.42-12.13 for grape leaves extracts. It can be concluded that grape skin extracts, as well as leaves extracts, can be a good source of phenolics with good antioxidant properties.

Izvorni jezik
Engleski

Znanstvena područja
Prehrambena tehnologija

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