title: Isolation and identification of four flavonoid constituents from the seeds of Oroxylum indicum by high-speed counter-current chromatography.
abstract: Four flavonoids, chrysin, baicalein, baicalein-7-O-glucoside, baicalein-7-O-diglucoside (Oroxylin B) and one unknown flavonoid have been isolated and purified for the first time in the seeds of Oroxylum indicum by high-speed counter-current chromatography with a two-phase solvent system composed of chloroform-methanol-water (8:10:5, v/v). Then, 50 mg baicalein-7-O-glucoside, 10.5 mg baicalein-7-O-diglucoside, 4.5 mg chrysin-7-O-diglucoside, 25 mg baicalein and 45 mg chrysin could be obtained after injecting 20 mg/ml sample extract ten times and their purities were 96, 90, 85, 95 and 98%, respectively. All these constituents were identified by high-performance liquid chromatography-mass spectrometry and nuclear magnetic resonance.
authors.affiliation: Mass Spectrometry Research Unit, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, UK. 183366@swansea.ac.uk
authors.forename: Li-Juan
authors.initials: LJ
authors.lastname: Chen
authors.forename: David E
authors.initials: DE
authors.lastname: Games
authors.forename: Jonathan
authors.initials: J
authors.lastname: Jones
mesh_terms: D029402:Bignoniaceae / Q000737:chemistry*; D003377:Countercurrent Distribution / Q000379:methods*; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D012639:Seeds / Q000737:chemistry*
chemical_list: D005419:Flavonoids