title: Isolation and purification of flavonoid glycosides from Trollius ledebouri using high-speed counter-current chromatography by stepwise increasing the flow-rate of the mobile phase.
abstract: Three flavonoid glycosides including orientin, vitexin, quercetin-3-O-neohesperidoside and one unknown compound were isolated and purified by high-speed counter-current chromatography (HSCCC) and semi-preparative HPLC from Trollius ledebouri Reichb., a traditional Chinese medicine. Preparative HSCCC with a two-phase solvent system composed of ethyl acetate-n-butanol-water (2:1:3, v/v/v) was successfully performed by increasing the flow-rate of the mobile phase from 1.5 to 2.5 ml/min after 190 min. Consequently, 95.8 mg orientin, 11.6 mg vitexin, 9.3 mg unknown compound with purities of over 97% and one partially purified peak fraction (contained quercetin-3-O-neohesperidoside at 85.1% purity) were obtained from 500 mg of the crude extract. Then the partially purified fraction was further purified by reversed-phase semi-preparative high-performance liquid chromatography. The structure identification of all pure fractions was carried out by UV, MS, 1H NMR and 13C NMR.
authors.affiliation: Shanghai Key Laboratory for Pharmaceutical Metabolite Research, School of Pharmacy, Second Military Medical University, No. 325 Guohe Road, Shanghai 200433, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Zhou
authors.forename: Jinyong
authors.initials: J
authors.lastname: Peng
authors.forename: Guorong
authors.initials: G
authors.lastname: Fan
authors.forename: Yutian
authors.initials: Y
authors.lastname: Wu
mesh_terms: D003377:Countercurrent Distribution / Q000379:methods*; D005419:Flavonoids / Q000302:isolation & purification*; D006027:Glycosides / Q000302:isolation & purification*; D029626:Ranunculaceae / Q000737:chemistry*
chemical_list: D005419:Flavonoids; D006027:Glycosides