柿葉のビタミンＣとポリフェノール成分との関係

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タイトル別名
  • The Relationship betwen Vitamin C and Polyphenol Content in Persimmon Leaves.
  • カキハ ノ ビタミン C ト ポリフェノール セイブン ト ノ カンケイ

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A series of studies was done to determine the effective ingredients, i. e. vitamin C and polyphenol, present in persimmon leaves. Specimen persimmon leaves obtained in June, July, September and October were examined. Three different drying methods were employed: simple drying, drying after steaming, and vacuum-freeze-drying. Our findings were as follows: 1) The largest quantity of vitamin C was found in the raw leaves obtained in July. The value recorded was 485mg/100g. 2) The vitamin C content of leaves obtained in September was substantially lower. It was observed that the quantity of vitamin C in the harvested leaves decreased as winter approached. 3) Young leaves appearing in October were found to contain much more vitamin C than older leaves which had been growing since the previous spring; the amount of hydroascorbic acid in these young leaves was 63% of total vitamin C. 4) The polyphenol content gradually increased as winter approached. 5) A smaller quantity of vitamin C was found in persimmon tea, compared with that found in the leaves examined, regardless of the drying method employed. 6) There was a positive direct correlation between the quantity of vitamin C and that of polyphenol in extracts of persimmon tea.

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