Study on the Antioxidant Activity of Grape Stems (<i>Vitis vinifera</i>). A Preliminary Assessment of Crude Extracts

作     者：Antonia Llobera 

作者机构：Department of Chemistry University of Illes Balears Palma de Mallorca Spain. 

出 版 物：《Food and Nutrition Sciences》 (食品与营养科学（英文）)

年 卷 期：2012年第3卷第4期

页      面：500-504页

学科分类：1008[医学-中药学(可授医学、理学学位)] 1006[医学-中西医结合] 100602[医学-中西医结合临床] 10[医学] 

主　　题：Grape Stem Antioxidant Activity Stem Extracts Polyphenols Radical Scavenging Activity DPPH 

摘      要：The antioxidant activity of 80% ethanol and 70% acetone extracts of stems from red and white grapes (Vitis vinifera) used in wine industry were evaluated to determine their feasibility as natural antioxidants. The results showed that all grape stem extracts were rich in total polyphenolic compounds and flavanols and had clear antioxidant activities. The free radical-scavenging capacity of the extracts was determined using the DPPH (2,2-diphenyl-1-picrylhydrazyl) method. The extracts obtained from red grape stem present EC50 values of 0.14 g dm/g DPPH (acetone extract) and 0.20 g dm/g DPPH (ethanol extract) while the extracts obtained from white grape stem present EC50 values of 0.26 g dm/g DPPH (acetone extract) and 0.37 g dm/g DPPH (ethanol extract). There are significant correlations between the total content of polyphenols and the antioxidant activity (R2 = 0.9352) and between the flavanols content and the antioxidant activity (R2 = 0.9404) of the grape stem extracts obtained.