title: Characterization of antioxidant activity of extracts from Flos Lonicerae.
abstract: Antioxidants are emerging as prophylactic and therapeutic agents for various diseases. However, little is known about the antioxidant property of the extract from Flos Lonicerae, a medically useful traditional Chinese medicine herb. Here the antioxidant capacity of water, methanolic and 70% ethanolic extracts prepared from Flos Lonicerae to scavenge DPPH radical and reduce Fe(3+) to Fe(2+) is evaluated. Chlorogenic acid, a major component of Flos Lonicerae, is identified and further purified from 70% ethanolic extract with HPLC and its antioxidant capacity is also characterized. The content of total phenolic compounds and chlorogenic acid in Flos Lonicerae is determined. The present results demonstrate that all Flos Lonicerae extracts examined here exhibit antioxidant activity and chlorogenic acid is a major contributor to this activity, which implicates that the Flos Lonicerae extract may serve as potential source of natural antioxidants for treatment of some diseases.
authors.affiliation: College of Food Science and Biotechnology, Tianjin University of Science and Technology, 1038 Dagu Nanlu, Hexi District, Tianjin, China.
authors.forename: Wu
authors.initials: W
authors.lastname: Lan
authors.forename: Zhang
authors.initials: Z
authors.lastname: Zhaojun
authors.forename: Zhang
authors.initials: Z
authors.lastname: Zesheng
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000302:isolation & purification; D001713:Biphenyl Compounds / Q000737:chemistry; D002726:Chlorogenic Acid / Q000737:chemistry / Q000302:isolation & purification; D002851:Chromatography, High Pressure Liquid; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification; D005290:Ferric Compounds / Q000737:chemistry; D005296:Ferrous Compounds / Q000737:chemistry; D035264:Flowers / Q000737:chemistry*; D016166:Free Radical Scavengers / Q000737:chemistry / Q000302:isolation & purification; D006834:Hydrazines / Q000737:chemistry; D031239:Lonicera / Q000737:chemistry*; D010084:Oxidation-Reduction; D010636:Phenols / Q000737:chemistry / Q000302:isolation & purification; D010851:Picrates
chemical_list: D000975:Antioxidants; D001713:Biphenyl Compounds; D004365:Drugs, Chinese Herbal; D005290:Ferric Compounds; D005296:Ferrous Compounds; D016166:Free Radical Scavengers; D006834:Hydrazines; D010636:Phenols; D010851:Picrates; D002726:Chlorogenic Acid; C004931:1,1-diphenyl-2-picrylhydrazyl