収穫時期の違いがカキ'西条'の葉における機能性成分含量に及ぼす影響(普及・教育・利用)  [in Japanese] Effect of Picking Time on Contents of Functional Component in Leaf of Japanese Persimmon 'Saijo'(Human Issues & Methodology in Horticulture)  [in Japanese]

14年生カキ'西条'を用い,成育中の柿葉におけるアスコルビン酸,イソケルシトリン,アストラガリン,ポリフェノール量含量の推移を検討した.その結果,アスコルビン酸とポリフェノールは6月から7月の含量がもっとも高く,それぞれ3700mg/100gDW, 16100mg/100gDW (アストラガリン相当量)であった.また,イソケルシトリン,アストラガリン含量は5月葉が最も高く,それぞれ480,520mg/100gDWで,その後新梢長の急激な伸長の伴い6月には激減することが明らかとなった.

Concentrations of functional components in the growing persimmon leaf were determined using 14-year-old Japanese persimmon 'Saijo' tree. The concentrations of functional components were extracted using hot water to estimate the utility of persimmon leaf tea. The results were as follows. The concentrations of T-AsA and polyphenol in persimmon leaf were at their highest levels from June to July (3,700mg/100gDW and 16,100mg astragalin eq./100gDW, respectively). The concentrations of isoquecitrin and astragalin in persimmon leaf were at their highest levels in May (480 and 520mg/100gDW, respectively). The latter two components demonstrated dramatic decreases in June during the time of rapid shoot growth.