title: [Chemical constituents from Polygonum capitatum and their antioxidation activities in vitro].
abstract: OBJECTIVE
  To study the chemical constituents from Polygonum capitatum and their antioxidation activties in vitro.
  
  
  METHODS
  Compounds were isolated and purified by silica, polyamide and Sephadex LH-20 column chromatography. Their structures were identified by physicochemical properties and spectral analyses. The isolated compounds were screened with three antioxidation models in vitro.
  
  
  RESULTS
  Ten compounds were isolated and identified as galic acid (1), protocatechuic acid (2), progallin A (3), nimbecetin (4), quercetin (5), quercitroside (6), tetracosylferulate (7), quercetin-3-O-beta-D-glucoside (8), beta-deucosterol and beta-sitosterol (10). Compounds 1-6 from this plant showed antioxidation activities.
  
  
  CONCLUSIONS
  Compound 3 and 7 are isolated from this genus for the first time, compound 2, 4 and 9 are isolated from this plant for the first time, the pharmacological activities of the pure compounds from this plant are also reported firstly.
authors.affiliation: Department of Complex Prescription of TCM, China Pharmceutical University, Nanjing 210038, China.
authors.forename: Zhi-Jun
authors.initials: ZJ
authors.lastname: Liu
authors.forename: Jin
authors.initials: J
authors.lastname: Qi
authors.forename: Dan-Ni
authors.initials: DN
authors.lastname: Zhu
authors.forename: Bo-Yang
authors.initials: BY
authors.lastname: Yu
mesh_terms: D047309:Flavones / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D016166:Free Radical Scavengers / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D005609:Free Radicals / Q000378:metabolism; D005707:Gallic Acid / Q000737:chemistry / Q000302:isolation & purification; D062385:Hydroxybenzoates / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D010636:Phenols / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D010946:Plants, Medicinal / Q000737:chemistry*; D028502:Polygonum / Q000737:chemistry*; D011794:Quercetin / Q000737:chemistry / Q000302:isolation & purification
chemical_list: D047309:Flavones; D016166:Free Radical Scavengers; D005609:Free Radicals; D062385:Hydroxybenzoates; D010636:Phenols; C009091:protocatechuic acid; D005707:Gallic Acid; D011794:Quercetin