title: Separation of epigallocatechin and flavonoids from Hypericum perforatum L. by high-speed counter-current chromatography and preparative high-performance liquid chromatography.
abstract: High-speed counter-current chromatography (HSCCC) and preparative high-performance liquid chromatography (prep-HPLC) were successively used for the separation of epigallocatechin and flavonoids from Hypericum perforatum L. The two-phase solvent system composed of ethyl acetate-methanol-water (10:1:10, v/v) was used for HSCCC. About 900mg of the crude extract was separated by HSCCC, yielding 7.8mg of quercitrin at a purity of over 97%, 12.6mg of quercetin at a purity of over 93%, and 38.9mg of a mixture of hyperoside, isoquercitrin and miquelianin constituting over 97% of the fraction. A mixture of epigallocatechin and avicularin pooled from three HSCCC runs, a total amount of 54.3mg, was further separated by prep-HPLC yielding 23.4mg of epigallocatechin and 15.3mg of avicularin each at a purity of over 97%.
authors.affiliation: Beijing University of Chemical Technology, Chaoyang District, China. weiyun@mail.buct.edu.cn
authors.forename: Yun
authors.initials: Y
authors.lastname: Wei
authors.forename: Qianqian
authors.initials: Q
authors.lastname: Xie
authors.forename: Wanting
authors.initials: W
authors.lastname: Dong
authors.forename: Yoichiro
authors.initials: Y
authors.lastname: Ito
mesh_terms: D002392:Catechin / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003377:Countercurrent Distribution / Q000379:methods*; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D020902:Hypericum / Q000737:chemistry*; D019906:Nuclear Magnetic Resonance, Biomolecular; D010936:Plant Extracts / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry
chemical_list: D005419:Flavonoids; D010936:Plant Extracts; D012997:Solvents; D002392:Catechin; C057580:gallocatechol