Triterpenoid saponins from the roots of tea plant (Camellia sinensis var. assamica)
2000
Lu, Y. | Umeda, Takuya | Yagi, A. | Sakata, K. | Chaudhuri, T. | Ganguly, D.K.
Three olean-12-ene type triterpenoid saponins, named TR-saponins A, B and C, were isolated as methyl esters from tea roots (Camellia sinensis var. assamica) after treatment with diazomethane. Their structures were established as the methyl esters of 3-O-alpha-L-arabinopyranosyl (1 leads to 3)-beta-D-glucuronopyranosyl-21, 22-di-O-angeloyl-R1-barrigenol-23-oic acid, 3-O-alpha-L-arabinopyranosyl (1 leads to 3)-beta-D-glucuronopyranosyl-21-O-angeloyl -22-O-2-methylbutanoyl-R1-barrigenol-23-oic acid and 3-O-alpha-L-arabinopyranosyl (1 leads to 3)-beta-D-glucuronopyranosyl-16alpha-O-acetyl -21-O-angeloyl-22-O-2-methylbutanoyl-R1-barrigenol -23-oic acid,2 by extensive 1D and 2D-NMR as well as FABMS and HR-MS analyses.
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