title: [Study on antioxidant activity of constituents from mulberry leaf].
abstract: OBJECTIVE
  To study the chemical constituents with antioxidant activity from mulberry leaf.
  
  
  METHODS
  Siliga gel column chromatography was used to isolate, and their structures were identified by spectras.
  
  
  METHODS
  Isolated constituents were tested in vitro for antioxidant activity against 1, 1-diphenyl -2-picrylhydrazyl (DPPH) and 2, 2' -azino-bis (3-ethylbenzthiazoline-6-sulfonic acid) (ABTS+) radicals.
  
  
  RESULTS
  Four known flavonoids were isolated from mulberry leaf and their structures were identified as kaempferol-3-O-beta-D-glucopyranoside (I), quercetin-3-O-beta-D-glucopyranoside (II), quercitrin (III), morin-3-O-beta-D-glucopyranoside (IV). All these compounds showed DPPH and ABTS+ radicals scavenging activity.
  
  
  CONCLUSIONS
  Compound IV has the strongest ABTS+ radicals scavenging effects.
authors.affiliation: College of Preclinical Medicine, Yanbian University, Yanji 133000, China.
authors.forename: Yu-Lan
authors.initials: YL
authors.lastname: Jiang
authors.forename: Hui-Shan
authors.initials: HS
authors.lastname: Piao
authors.forename: Gao
authors.initials: G
authors.lastname: Li
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D005609:Free Radicals / Q000378:metabolism; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D009005:Monosaccharides / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D031625:Morus / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D011794:Quercetin / Q000031:analogs & derivatives / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology
chemical_list: D000975:Antioxidants; D005419:Flavonoids; D005609:Free Radicals; D009005:Monosaccharides; C517440:quercetin-3'-O-beta-D-glucopyranoside; C012526:quercitrin; D011794:Quercetin