The nutraceutical properties and antioxidant capacity analysis of Summer Black skins from the main four producing areas in Yunnan

The skins of Summer Black from the main four producing grapes areas in Yunnan was used as the material,its nutraceutical properties and antioxidant activity were analyzed. The antioxidant activity of grape skin extracts were evaluated by DPPH,ABTS⁺ radical scavenging capacity and reducing power(FRAP). The basic ingredients and composition of the same species were variable,due to the impact of the environmental differences. Main lipids in the skin were unsaturated fatty acids,the main monosaccharide contents of descending order were glucose>arabinose,galacturonic acid,galactose. Proanthocyanidins and polyphenol content in grape skins were significant differences,rutin and catechin were main components of phenolics in grape skins. The peel polyphenols had high antioxidant activity with IC50 values were 13.34~14.86 μg/m L for DPPH,9.15~10.64 μg/m L for ABTS+and 32.63~34.24 μg/m L for FRAP.