title: [Timosaponins E1 and E2].
abstract: By means of silica gel chromatography and HPLC, two compounds were isolated from Anemarrhena asphodeloides Bge.. On the basis of chemical and spectral (MS, 1H, 13CNMR, IR) analyses, their structures were elucidated as (25S)-26-O-beta-D-glucopyranosyl-22-hydroxy-5 beta-furost-3 beta, 15 alpha, 26-triol-3-O-beta-D-glucopyranosyl (1-->2)-beta-D-galactopyranoside (1), and (25S)-26-O-beta-D-glucopyranosyl-22-methoxy-5 beta-furost-3 beta, 15 alpha, 26-triol-3-O-beta-D-glucopyranosyl (1-->2)-beta-D-galactopyranoside (2). They are named as timosaponin E1 (1) and timosaponin E2 (2) respectively. The structure of anemarrhenasaponin-I (A) is briefly discussed. Timosaponins are the main active constituents of Anemarrhena asphodeloides, most of them were shown to can inhibit platelet aggregation.
authors.affiliation: Department of Phytochemistry, Shenyang Pharmaceutical Univercity, Shenyang 110015.
authors.forename: Z
authors.initials: Z
authors.lastname: Meng
authors.forename: S
authors.initials: S
authors.lastname: Xu
authors.forename: L
authors.initials: L
authors.lastname: Meng
mesh_terms: D031403:Anemarrhena / Q000737:chemistry*; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification; D015394:Molecular Structure; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*; D013256:Steroids / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D004365:Drugs, Chinese Herbal; D012503:Saponins; D013256:Steroids; C411448:timosaponin E1; C411449:timosaponin E2