• Journal of the Korean Society of Food Science and Nutrition
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• v.36 no.12
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• pp.1491-1496
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• 2007

As an oriental medicinal plant, wild grape (WG, Vitis coignetiae) has been known to contain abundant nutrients compared to grape (Vitis vinifera L.) and as a source of stilbenes, a kind of polyphenol. This study was performed to investigate the antioxidative activity of WG extracts by measuring electron donating ability (EDA), nitrite scavenging ability (NSA), super oxide dismutase (SOD)-like activity and total polyphenol content (TPC). The extracts were obtained using microwave-assisted extraction (microwave power: 90 W, extraction time: 5 min, extractant: water, 50 and 100% ethanol). EDAs, SOD-like activities and TPCs were the highest at 50% ethanol extracts while conversely lowest at 100% ethanol extracts. EDAs of 50% and 100% ethanol extracts at 1.6 g/dL concentration, $97.70{\pm}0.55\;and\;98.05{\pm}0.36%$, were higher than those of 0.1 and 1% L-ascorbic acids, $101.44{\pm}0.98%\;and\;99.43{\pm}0.78%$, respectively. At the concentration of 1.6 g/dL, 50% ethanol extract showed lower NSA (pH 1.2) than water extract unlike EDA, TPC and SOD-like activity. Regarding TPCs of WG extracts, the activities were the highest at 50% ethanol extracts (1.6 g/dL: $38.76{\pm}0.23$ mM gallic acid equiv.) followed by water and 100% ethanol extracts. The results suggest the usefulness of developing functional foods using antioxidative active compounds of WG with high polyphenol contents.