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Annual variation of soluble tannin in the fruits and leaves of persimmon
Author(s): 
Pages: 61-66
Year: Issue:  6
Journal: Journal of Nanjing Forestry University(Natural Science Edition)

Keyword:  persimmon fruitspersimmon leavessoluble tanninannual variation;
Abstract: In order to reveal annual variation of soluble tannin contents in the fruits and leaves of persimmon, eleven va?rieties of samples were measured by Folin?Ciocalteu method including PCA, PCNA, PVNA and wild varieties. The re?sults showed that there were abundant soluble tannin in persimmon fruits and leaves, and the contents fluctuated in the range of 0-70.92 mg/g and 5.99-65.49 mg/g during the entire monitored period, respectively. The contents of soluble tannin in fruits were decreased with the growth, and there were significant negative correlations with fresh weight, verti?cal diameter and transverse diameter, which indicated that the tannin cells dilution by fruit enlargement account for the loss of astringency on the tree. The soluble tannin contents in 11 varieties of persimmon leaves showed small difference and the annual variety trends were almost identical. In addition, the results also suggested that the optimum harvesting time promoting effective utilization of soluble tannin in persimmon leaves was from middle July to early August.
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