title: Triterpenoid saponins from the roots of tea plant (Camellia sinensis var. assamica).
abstract: 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.
authors.affiliation: Institute for Chemical Research, Kyoto University, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Lu
authors.forename: T
authors.initials: T
authors.lastname: Umeda
authors.forename: A
authors.initials: A
authors.lastname: Yagi
authors.forename: K
authors.initials: K
authors.lastname: Sakata
authors.forename: T
authors.initials: T
authors.lastname: Chaudhuri
authors.forename: D K
authors.initials: DK
authors.lastname: Ganguly
authors.forename: S
authors.initials: S
authors.lastname: Sarma
mesh_terms: D009682:Magnetic Resonance Spectroscopy; D018517:Plant Roots / Q000737:chemistry; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*; D016339:Spectrometry, Mass, Fast Atom Bombardment; D013662:Tea / Q000737:chemistry*; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D012503:Saponins; D013662:Tea; D014315:Triterpenes