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Triterpenoid saponins from the roots of tea plant (Camellia sinensis var. assamica)

2000; Elsevier BV; Volume: 53; Issue: 8 Linguagem: Inglês

10.1016/s0031-9422(99)00559-2

1873-3700

Yi Lu, Tatsuya Umeda, Akihito Yagi, Kanzo Sakata, T. Chaudhuri, Dilip Ganguly, Scion Sarma,

Traditional Chinese Medicine Analysis

Three olean-12-ene type triterpenoid saponins, named TR-saponins A, B and C, were isolated as methyl esters from tea roots (Camellia sinesis var. assamica) after treatment with diazomethane. Their structures were established as the methyl esters of 3-O-alpha-L-arabinopyranosyl (1-->3)-beta-D-glucuronopyranosyl-21, 22-di-O-angeloyl-R1-barrigenol-23-oic acid, 3-O-alpha-L-arabinopyranosyl (1-->3)-beta-D-glucuronopyranosyl-21-O-angeloyl-22-O-2-me thylbutanoyl-R1- barrigenol-23-oic acid and 3-O-alpha-L-arabinopyranosyl (1-->3)-beta-D-glucuronopyranosyl-16 alpha-O-acetyl-21-O-angeloyl-22-O-2-methylbutanoyl-R1-bar rigenol-23-oic acid, by extensive 1D and 2D-NMR as well as FABMS and HR-MS analyses.