Effect of Picking Time on Contents of Functional Component in Leaf of Japanese Persimmon ‘Saijo’

Abstract

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 (3,700 mg/100 gDW and 16,100 mg astragalin eq./100 gDW, respectively). The concentrations of isoquecitrin and astragalin in persimmon leaf were at their highest levels in May (480 and 520 mg/100 gDW, respectively). The latter two components demonstrated dramatic decreases in June during the time of rapid shoot growth.