title: Preparative isolation and purification of isoflavan and pterocarpan glycosides from Astragalus membranaceus Bge. var. mongholicus (Bge.) Hsiao by high-speed counter-current chromatography.
abstract: (3R)-(-)-7,2'-Dihydroxy-3',4'-dimethyl isoflavan-7-O-beta-D-glucopyranoside and (6aR, 11aR) 9,10-di-methoxypterocarpan-3-O-beta-D-glucopyranoside were separated from the ethyl acetate extract of the root of Astragalus membranaceus Bge. var. mongholicus (Bge.) Hsiao by high-speed counter-current chromatography (HSCCC). A two-phase system composed of ethyl acetate-ethanol-acetic acid-water (4:1:0.25:5, v/v) was selected by analytical HSCCC. Preparative HSCCC yielded, from 100 mg of the partially purified extract, 50 mg of isoflavan glycoside and 10 mg of pterocarpan glycoside each at over 95% purity by high-performance liquid chromatography (HPLC) analysis. Their structures were identified by MS, 1H NMR and 13C NMR.
authors.affiliation: Department of Biology, Graduate School of Chinese Academy of Science, P.O. Box 3908, Beijing 100039, China.
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Ma
authors.forename: Pengfei
authors.initials: P
authors.lastname: Tu
authors.forename: Yingjie
authors.initials: Y
authors.lastname: Chen
authors.forename: Tianyou
authors.initials: T
authors.lastname: Zhang
authors.forename: Yun
authors.initials: Y
authors.lastname: Wei
authors.forename: Yoichiro
authors.initials: Y
authors.lastname: Ito
mesh_terms: D027883:Astragalus Plant / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D003377:Countercurrent Distribution / Q000379:methods*; D006027:Glycosides / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry
chemical_list: D006027:Glycosides