title: Preparative isolation of alkaloids from Dactylicapnos scandens using pH-zone-refining counter-current chromatography by changing the length of the separation column.
abstract: pH-Zone-refining counter-current chromatography was successfully applied for the preparative separation of alkaloids from Dactylicapnos scandens. The two-phase solvent system was composed of petroleum ether-ethyl acetate-methanol-water (3:7:1:9, v/v), where 20 mM of triethylamine (TEA) was added to the upper phase as a retainer and 5 mM of hydrochloric acid (HCl) to the aqueous phase as an eluter. In this experiment, the apparatus with an adjustable length of the separation column was used for the separation of alkaloids from D. scandens and the resolution of the compounds can be remarkably improved by increasing the length of the separation column. As a result, 70 mg protopin, 30 mg (+) corydine, 120 mg (+) isocorydine and 40 mg (+) glaucine were obtained from 1.0 g of the crude extracts and each with 99.2%, 96.5%, 99.3%, 99.5% purity as determined by HPLC. The chemical structures of these compounds were confirmed by positive ESI-MS and (1)H NMR.
authors: Institute of Chinese Material Medical, China Academy of Chinese Medical Sciences, Beijing, China.
authors: Xiao
authors: X
authors: Wang
authors: Hongjing
authors: H
authors: Dong
authors: Bin
authors: B
authors: Yang
authors: Dahui
authors: D
authors: Liu
authors: Wenjuan
authors: W
authors: Duan
authors: Luqi
authors: L
authors: Huang
mesh_terms: D001060:Aporphines / Q000737:chemistry / Q000302:isolation & purification*; D053119:Benzophenanthridines / Q000737:chemistry / Q000302:isolation & purification*; D001600:Berberine Alkaloids / Q000737:chemistry / Q000302:isolation & purification*; D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation / Q000379:methods; D003377:Countercurrent Distribution / Q000295:instrumentation* / Q000379:methods*; D031310:Fumarioideae / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry
chemical_list: D001060:Aporphines; D053119:Benzophenanthridines; D001600:Berberine Alkaloids; D010936:Plant Extracts; C009093:protopine