Potential of using shoot length as indicator of suitable steaming treatment time for maintaining T-AsA content of persimmon [Diospyros kaki] leaf tea
2007
Tsurunaga, Y.(Shimane-ken. Agricultural Technology Center, Hamada (Japan)) | Tanaka, D. | Matsumoto, T. | Suzuki, Y. | Itamura, H.
In this study, we investigated the use of shoot length as an indicator of suitable steaming time for maintaining the total ascorbic acid (T-AsA) content of persimmon leaf tea during manufacture and preservation. We used persimmon leaves harvested in June. We determined their shoot length, and examined the effects of shoot length on leaf thickness and T-AsA content. The suitable steaming time for maintaining a high T-AsA content differed between leaves of different shoot lengths. The steaming times of foliating leaves (F-leaves), short leaves (S-leaves, 25-44cm), medium leaves (M-leaves, 45-64cm), and long leaves (L-leaves, 65-85cm) were, respectively, 3, 5, 10, and 10 min. Results of the examination of different persimmon cultivars and individual picking times of the leaves imply that shoot length is a useful indicator of suitable steaming treatment time.
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