title: Purification of six lignans from the stems of Schisandra chinensis by using high-speed counter-current chromatography combined with preparative high-performance liquid chromatography.
abstract: A method for the preparative purification of lignans from Schisandra chinensis was established using a combination of high-speed counter-current chromatography (HSCCC) and preparative high-performance liquid chromatography (HPLC). The crude extracts obtained from S. chinensis by using 70% ethanol were separated on a macroporous resin column and then eluted with a graded ethanol series. A two-phase solvent system consisting of n-hexane-ethyl acetate-methanol-water (1:1:1:1, v/v) was used for HSCCC, and a mobile phase of acetonitrile-water (50:50, v/v) was used for preparative HPLC. The results obtained using HSCCC were compared with those obtained using preparative HPLC, and their advantages were further integrated to improve the separation efficiency. Six known lignans were identified by electrospray ionisation mass spectrometry and (1)H nuclear magnetic resonance (NMR) and (13)C NMR analyses; the purities of all the compounds were more than 91%.
authors.affiliation: College of Food, Shenyang Agricultural University, Shenyang 110866, People's Republic of China; College of Chemistry, Chemical Engineering and Food Safety, Food Science Research Institute, Bohai University, Jinzhou 121013, People's Republic of China.
authors.forename: Lijie
authors.initials: L
authors.lastname: Zhu
authors.affiliation: College of Food, Shenyang Agricultural University, Shenyang 110866, People's Republic of China.
authors.forename: Bin
authors.initials: B
authors.lastname: Li
authors.affiliation: College of Food, Shenyang Agricultural University, Shenyang 110866, People's Republic of China; College of Chemistry, Chemical Engineering and Food Safety, Food Science Research Institute, Bohai University, Jinzhou 121013, People's Republic of China.
authors.forename: Xiuying
authors.initials: X
authors.lastname: Liu
authors.affiliation: Department of Horticulture, Eastern Liaoning University, Dandong 118003, People's Republic of China. Electronic address: hgh0123@163.com.
authors.forename: Guohui
authors.initials: G
authors.lastname: Huang
authors.affiliation: College of Food, Shenyang Agricultural University, Shenyang 110866, People's Republic of China. Electronic address: mengxjsy@126.com.
authors.forename: Xianjun
authors.initials: X
authors.lastname: Meng
mesh_terms: D002851:Chromatography, High Pressure Liquid; D003377:Countercurrent Distribution; D006586:Hexanes / Q000737:chemistry; D017705:Lignans / Q000032:analysis*; D009682:Magnetic Resonance Spectroscopy; D000432:Methanol / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D032141:Schisandra / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D006586:Hexanes; D017705:Lignans; D012997:Solvents; C026385:n-hexane; D000432:Methanol
keywords: High-speed counter-current chromatography; Lignans; Preparative HPLC; Schisandra chinensis