title: Antioxidant properties of Urtica pilulifera root, seed, flower, and leaf extract.
abstract: This study was conducted to evaluate the antioxidative properties of hydroalcoholic (80%) extracts from different parts of Urtica pilulifera L. (Family Urticaceae), including leaf (UPL), flower (UPF), seed (UPS), and root (UPR). Antioxidative activity of the extracts was measured using the ferric thiocyanate method, thiobarbituric acid method, reductive potential, metal chelating, free radical, superoxide anion radical, and hydrogen peroxide scavenging activity. In addition, the results were compared with antioxidants such as tert-butylated hydroxyanisole (BHA), tert-butylated hydroxytoluene (BHT), and α-tocopherol. Total antioxidant activities of UPS, UPF, UPL, UPR, BHA, BHT, and α-tocopherol were 88.79%, 85.13%, 86.72%, 78.46%, 81.31%, 76.12%, and 46.28%, respectively. Like the antioxidant activity, the reducing power and the superoxide anion radical and free radical scavenging activities of UPL, UPF, UPS, and UPR are concentration dependent. A correlation between higher antioxidant activity and the amount of total phenolics was found in the extracts.
authors.affiliation: Department of Chemistry, Faculty of Arts and Sciences, Ondokuz Mayis University, Samsun, Turkey. ozentevfik@hotmail.com
authors.forename: Tevfik
authors.initials: T
authors.lastname: Ozen
authors.forename: Zeynep
authors.initials: Z
authors.lastname: Cöllü
authors.forename: Halil
authors.initials: H
authors.lastname: Korkmaz
mesh_terms: D000975:Antioxidants / Q000032:analysis / Q000494:pharmacology*; D001713:Biphenyl Compounds; D002614:Chelating Agents; D035264:Flowers / Q000737:chemistry*; D016166:Free Radical Scavengers; D006861:Hydrogen Peroxide; D007501:Iron; D010084:Oxidation-Reduction; D010851:Picrates; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology; D018515:Plant Leaves / Q000737:chemistry*; D018517:Plant Roots / Q000737:chemistry*; D012639:Seeds / Q000737:chemistry*; D013481:Superoxides; D017392:Thiobarbituric Acid Reactive Substances; D013861:Thiocyanates; D027003:Urticaceae / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D001713:Biphenyl Compounds; D002614:Chelating Agents; D016166:Free Radical Scavengers; D010851:Picrates; D010936:Plant Extracts; D017392:Thiobarbituric Acid Reactive Substances; D013861:Thiocyanates; D013481:Superoxides; C103724:ferric thiocyanate; D006861:Hydrogen Peroxide; C004931:1,1-diphenyl-2-picrylhydrazyl; D007501:Iron