| Budget Amount *help |
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1991: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1990: ¥900,000 (Direct Cost: ¥900,000)
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| Research Abstract |
The leaves of Engelhardtia crysolepis Hance (Juglandaceae) have been used as a sweet tea called huang-qi in China. Present author reported on the isolation of neoastillbin (3-O-rhamnosyl-(2S, 3S)-taxifolin, 1) as a sweet principle of the leaves together with three non-sweet isomers of neoastilbin, astilbin, neoisoastillbin and isoastilbin. In further investigation of the sweet principle of the leaves, an additional new sweet dihydroflavonol glycoside [glucosyl-rhamnosyl-(2R, 3R)-taxifolin, 2] was isolated. This report deals with the structural elucidation of 2, and isomerization of astilbin and 2. Furthermore, the isolation and identification of the flavonoid compound of four other Engelhardtia species, which grows in Yunan, China, were reported.
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