title: Completed preparative separation of alkaloids from Cephaltaxus fortunine by step-pH-gradient high-speed counter-current chromatography.
abstract: Cephalotaxine-type alkaloids are the anti-cancer components in twigs, leaves, roots and seeds of Cephalotaxus fortunine. It is very important to use the limited resource by finding an efficient purification technology of the alkaloids. Separation of cephalotaxine-type alkaloids in Cephalotaxus fortunine by step-pH-gradient high-speed counter-current chromatography (step-pH-gradient HSCCC) was studied in this paper. The step-pH-gradient HSCCC was performed on a HSCCC instrument equipped with a 400-mL column, using the upper phase of ethyl acetate-n-hexane-water, with added 0.01% trifluoroacetic acid (TFA) as stationary phase, and the lower phase of ethyl acetate-n-hexane-water, with added 2% NH(4)OH, 0.2% NH(4)OH and 0.05% TFA as mobile phase. For each separation, 800mg of extract of cephalotaxine-type alkaloids was separated to yield 9.3mg of drupacine, 15.9mg of wilsonine, 130.4mg of cephalotaxine, 64.8mg of epi-wilsonine, 12.8mg of fortunine and 35.6mg of acetylcephalotaxine with purities 81.2%, 85.7%, 95.3%, 97.5%, 89.1% and 96.2%, respectively. The recovery of each alkaloid was more than 90%. The structures of the six alkaloids were identified by electrospray ionization mass spectrum (ESI-MS) and (1)H and (13)C NMR.
authors.affiliation: Research Center of Natural Products, Hunan Agricultural University, Changsha, China.
authors.forename: Zhonghua
authors.initials: Z
authors.lastname: Liu
authors.forename: Qizhen
authors.initials: Q
authors.lastname: Du
authors.forename: Kuiwu
authors.initials: K
authors.lastname: Wang
authors.forename: Lili
authors.initials: L
authors.lastname: Xiu
authors.forename: Guanglei
authors.initials: G
authors.lastname: Song
mesh_terms: D032483:Cephalotaxus / Q000737:chemistry*; D003377:Countercurrent Distribution / Q000295:instrumentation / Q000379:methods*; D006248:Harringtonines / Q000032:analysis / Q000302:isolation & purification*; D010936:Plant Extracts / Q000032:analysis / Q000302:isolation & purification
chemical_list: D006248:Harringtonines; D010936:Plant Extracts