title: [Flavonoids from root of Machilus wangchiana].
abstract: Twelve flavonoids were isolated from an ethanol extract of Machilus wangchiana by a combination of various chromatographic techniques including column chromatography over silica gel and Sephadex LH-20 and reversed-phase flash chromatography and HPLC. Their structures were identified by spectroscopic data analysis (IR, MS, and NMR) as (+)-catechin (1), (-)-epicatechin (2), 3'-O-methyl-(+)-catechin (3), 3'-O-methyl-(-)-epicatechin (4), 3, 5, 7, 2', 5'-pentahydroxy flavan (5), (-)-naringenin (6), (-)-eriodictyol (7), (-)-liquiritigenin (8), (2R,3R)-(+)-dihydrokaempferol (9), (2R,3S)-(-)-dihydro- kaempferol (10), (2R, 3R)-(+)-taxifolin (11), and quercetin (12). Compounds 1-10 are isolated from the genus Machilus for the first time.
authors.forename: Wei
authors.initials: W
authors.lastname: Cheng
authors.forename: Wen-Dong
authors.initials: WD
authors.lastname: Xu
authors.forename: Xiao-Na
authors.initials: XN
authors.lastname: Fan
authors.forename: Jian-Gong
authors.initials: JG
authors.lastname: Shi
mesh_terms: D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D005419:Flavonoids / Q000737:chemistry*; D019770:Lauraceae / Q000737:chemistry*; D013058:Mass Spectrometry; D015394:Molecular Structure; D018517:Plant Roots / Q000737:chemistry*
chemical_list: D004365:Drugs, Chinese Herbal; D005419:Flavonoids