title: Antioxidant properties of Glossogyne tenuifolia.
abstract: Glossogyne tenuifolia (Labill) Cass. (Compositae) is a special medicinal plant in the Pescadores Islands. Ethanolic, cold and hot water extracts were prepared from the dried herb and their antioxidant properties and components were studied. Ascorbic acid, alpha-tocopherol, butylated hydroxyanisole, citric and ethylenediaminetetraacetic acids were used in assays for comparison. With regard to EC(50) values in antioxidant activity, ethanolic and hot water extracts (0.08 and 0.09 mg/ml) were much more effective than the cold water extract (0.76 mg/ml). At 1.0 mg/ml, reducing capacities were 1.57, 0.31 and 1.04 for ethanolic, cold water and hot water extracts, respectively. Scavenging abilities on 1,1-diphenyl-2-picrylhydrazyl radicals were in descending order: ethanolic > cold water > hot water extracts. At 20 mg/ml, the hot water extract chelated all hydroxyl ions (100%) whereas the scavenging ability of the cold water extract was 68.86%. Chelating abilities on ferrous ions were in descending order: cold water > hot water > ethanolic extracts. Phenols were found to be the major antioxidant components. All EC(50) values were below 20 mg/ml, and some even below 0.1 mg/ml, indicating that all three extracts from G. tenuifolia were rich in antioxidant properties.
authors.affiliation: Department of Food Science, Nutrition and Nutraceutical Biotechnology, Shih Chien University, Taipei 104, Taiwan, ROC.
authors.forename: Joan-Hwa
authors.initials: JH
authors.lastname: Yang
authors.forename: Shu-Yao
authors.initials: SY
authors.lastname: Tsai
authors.forename: Ching-Mei
authors.initials: CM
authors.lastname: Han
authors.forename: Chun-Chien
authors.initials: CC
authors.lastname: Shih
authors.forename: Jeng-Leun
authors.initials: JL
authors.lastname: Mau
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D001205:Ascorbic Acid / Q000032:analysis; D019659:Asteraceae / Q000737:chemistry*; D001713:Biphenyl Compounds / Q000037:antagonists & inhibitors / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004305:Dose-Response Relationship, Drug; D005296:Ferrous Compounds / Q000037:antagonists & inhibitors / Q000737:chemistry; D016166:Free Radical Scavengers / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D006834:Hydrazines / Q000037:antagonists & inhibitors / Q000737:chemistry; D017665:Hydroxyl Radical / Q000037:antagonists & inhibitors / Q000737:chemistry; D007502:Iron Chelating Agents / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D010084:Oxidation-Reduction / Q000187:drug effects; D010851:Picrates; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D024505:Tocopherols / Q000032:analysis; D019207:beta Carotene / Q000032:analysis
chemical_list: D000975:Antioxidants; D001713:Biphenyl Compounds; D005296:Ferrous Compounds; D016166:Free Radical Scavengers; D006834:Hydrazines; D007502:Iron Chelating Agents; D010851:Picrates; D010936:Plant Extracts; D019207:beta Carotene; D017665:Hydroxyl Radical; C020748:ferrous sulfate; C004931:1,1-diphenyl-2-picrylhydrazyl; D001205:Ascorbic Acid; D024505:Tocopherols