title: [Studies on the antioxidant activities of leaves from Senecio argunensis].
abstract: OBJECTIVE
  To study antioxidant activities of different extracts of Senecio argunensis.
  
  
  METHODS
  The antioxidant activities of S. argunensis extracts with acetoacetate, n-Butanol and water were detected by DPPH * free radical-scavenging method and beta-carotene/linoleic acid system.
  
  
  RESULTS
  The acetoacetate, n-Butanol and water extracts from S. argunensis eliminated DPPH * in dose-dependent manner, their EC50 values were 0.0198, 0.0219 and 0.092 mg/ml, respectively. The strength order of the antioxidant activities of the three parts in beta-carotene/linoleic acid system was acetoacetate, n-Butanol and water extracts.
  
  
  CONCLUSIONS
  The extracts of the three parts of S. argunensis all have antioxidant activities. Among these extracts, extracts with acetoacetate have the highest antioxidant activity.
authors.affiliation: Key Laboratory of Ministry of Education for Medicinal Plant Resource and Natural Pharmaceutical Chemistry, Xi'an 710062, China. zyjuan2005@stu.snnu.edu.cn
authors.forename: Yan-Juan
authors.initials: YJ
authors.lastname: Zhou
authors.forename: Cui-Qin
authors.initials: CQ
authors.lastname: Li
authors.forename: Zhe-Zhi
authors.initials: ZZ
authors.lastname: Wang
mesh_terms: D000090:Acetoacetates; D000975:Antioxidants / Q000494:pharmacology*; D019659:Asteraceae / Q000737:chemistry*; D001713:Biphenyl Compounds / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D016166:Free Radical Scavengers; D019787:Linoleic Acid; D010851:Picrates / Q000378:metabolism*; D010936:Plant Extracts / Q000302:isolation & purification / Q000494:pharmacology*; D018515:Plant Leaves / Q000737:chemistry; D012997:Solvents; D019207:beta Carotene
chemical_list: D000090:Acetoacetates; D000975:Antioxidants; D001713:Biphenyl Compounds; D016166:Free Radical Scavengers; D010851:Picrates; D010936:Plant Extracts; D012997:Solvents; D019207:beta Carotene; C016635:acetoacetic acid; D019787:Linoleic Acid; C004931:1,1-diphenyl-2-picrylhydrazyl