title: Isolation of isomangiferin from honeybush (Cyclopia subternata) using high-speed counter-current chromatography and high-performance liquid chromatography.
abstract: Isomangiferin was isolated from Cyclopia subternata using a multi-step process including extraction, liquid-liquid partitioning, high-speed counter-current chromatography (HSCCC) and semi-preparative reversed-phase high-performance liquid chromatography (HPLC). Enrichment of phenolic compounds in a methanol extract of C. subternata leaves was conducted using liquid-liquid partitioning with ethyl acetate-methanol-water (1:1:2, v/v). The enriched fraction was further fractionated using HSCCC with a ternary solvent system consisting of tert-butyl methyl ether-n-butanol-acetonitrile-water (3:1:1:5, v/v). Isomangiferin was isolated by semi-preparative reversed-phase HPLC from a fraction containing mostly mangiferin and isomangiferin. The chemical structure of isomangiferin was confirmed by LC-high-resolution electrospray ionization MS, as well as one- and two-dimensional NMR spectroscopy.
authors.affiliation: ARC Infruitec-Nietvoorbij, Stellenbosch, South Africa. dbeerd@arc.agric.za
authors.forename: Dalene
authors.initials: D
authors.lastname: de Beer
authors.forename: Gerold
authors.initials: G
authors.lastname: Jerz
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Joubert
authors.forename: Victor
authors.initials: V
authors.lastname: Wray
authors.forename: Peter
authors.initials: P
authors.lastname: Winterhalter
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003377:Countercurrent Distribution / Q000379:methods*; D053998:Cyclopia Plant / Q000737:chemistry*; D000432:Methanol / Q000737:chemistry; D019906:Nuclear Magnetic Resonance, Biomolecular; D010936:Plant Extracts / Q000737:chemistry*; D044004:Xanthones / Q000302:isolation & purification*
chemical_list: D010936:Plant Extracts; D044004:Xanthones; C013592:mangiferin; C061492:isomangiferin; D000432:Methanol