title: [Study on chemical constituents of flavonoids in fresh herb of Houttuynia cordata].
abstract: OBJECTIVE
  To study the flavonoid constituents in fresh herb of Houttuynia cordata.
  
  
  METHODS
  Various column packing materials including Diaion HP - 20, Sephadex LH - 20, ODS and silica gel were employed for the isolation and purification of compounds from H. cordata. The structures of the compounds were identified by physiochemical properties and spectral analysis.
  
  
  RESULTS
  Five compounds were isolated, and their structures were identified as quercetin-3-O-beta-D-galactoside-7-O-beta-D-glucoside (1), kaempferol-3-O-alpha-L-rhamnopyranosyl-(1 --> 6)-beta-D-glucopyranoside (2), quercitrin (3), hyperin (4), quercetin 3-O-alpha-L-rhamnopyranosyl-7-O-beta-D-glucopyranoside (5).
  
  
  CONCLUSIONS
  Compounds 1, 2 and 5 were separated from H. cordata for the first time.
authors.affiliation: School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China.
authors.forename: Jiang
authors.initials: J
authors.lastname: Meng
authors.forename: Xiao-Ping
authors.initials: XP
authors.lastname: Dong
authors.forename: Zhi-Hong
authors.initials: ZH
authors.lastname: Jiang
authors.forename: Sze-Yin Kelvin
authors.initials: SY
authors.lastname: Leung
authors.forename: Zhong-Zhen
authors.initials: ZZ
authors.lastname: Zhao
mesh_terms: D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification; D052859:Houttuynia / Q000737:chemistry*; D010946:Plants, Medicinal / Q000737:chemistry*; D011794:Quercetin / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification
chemical_list: D005419:Flavonoids; D006027:Glycosides; C078277:quercetin-3-O-galactoside-7-O-glucoside; D011794:Quercetin