可食性のブドウ若芽の数種ビタミン類とポリフェノール含量及びその利用

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The contents of vitamins, polyphenol, and antioxidant activities by ABTS method in young buds of 9 cultivars of grapes(Vitis spp. ; Beniizu, Aki Queen, Oriental Star, Honney Venus, Shine Muscat, Kyoho, Takao, Muscat Bailey A, Fujiminori)found in the nipped bud, were investigated. Vitamin B1 content of young buds of 9 kinds grapes averaged 0.08mg/100g fresh weight, withMuscat Bailey A(0.04mg/100g)containing about half as much as the others. The average B2 content was 0.02mg/100g and did not differ between 9 cultivars. The average contents of niacin, vitamin B6 and total vitamin C were 1.5mg/100g, 0.06mg/100g and 111mg/100g, respectively. Polyphenol content expressed as garic acid and the antioxidant activities averaged 770mg/100gand 26mmolTorox-eq/100g, respectively, and the polyphenol content and antioxidant activity ofOriental Star were about twice as much as the others. Resveratrol content averaged 6.8μg/g with Takao and Kyoho containing double the concentration of the others. The antioxidant activities were correlated with the polyphenol contents. After deep-frying, polyphenol and vitamin Ccontents decreased about 40%, and as the taste was good without any bitterness, the usefulness of the nipped bud was shown.
2012-03-10