title: Determination of antioxidant activity of lichen Cetraria islandica (L) Ach.
abstract: The study was aimed at evaluating the antioxidant activity of aqueous extract of C. islandica. The antioxidant activity, reducing power, superoxide anion radical scavenging and free radical scavenging activities were studied. The antioxidant activity increased with the increasing amount of extracts (from 50 to 500 microg) added to linoleic acid emulsion. About 50, 100, 250, and 500 microg of aqueous extract of C. islandica showed higher antioxidant activity than 500 microg of alpha-tocopherol. The samples showed 96, 99, 100, and 100% inhibition on peroxidation of linoleic acid, respectively. On the other hand, the 500 microg of alpha-tocopherol showed 77% inhibition on peroxidation on linoleic acid emulsion. Like antioxidant activity, the reducing power, superoxide anion radical scavenging and free radical scavenging activities of C. islandica depends on concentration and increasing with increased amount of sample. The results obtained in the present study indicate that C. islandica is a potential source of natural antioxidant.
authors.affiliation: Department of Chemistry, Faculty of Science and Arts, Ataturk University, 25240 Erzurum, Turkey. igulcin@yahoo.com
authors.forename: Ilhami
authors.initials: I
authors.lastname: Gülçin
authors.forename: Münir
authors.initials: M
authors.lastname: Oktay
authors.forename: O Irfan
authors.initials: OI
authors.lastname: Küfrevioğlu
authors.forename: Ali
authors.initials: A
authors.lastname: Aslan
mesh_terms: D000975:Antioxidants / Q000302:isolation & purification / Q000494:pharmacology*; D004353:Drug Evaluation, Preclinical / Q000379:methods / Q000706:statistics & numerical data; D016166:Free Radical Scavengers / Q000494:pharmacology; D008011:Lichens / Q000302:isolation & purification; D015227:Lipid Peroxidation / Q000187:drug effects; D010936:Plant Extracts / Q000494:pharmacology
chemical_list: D000975:Antioxidants; D016166:Free Radical Scavengers; D010936:Plant Extracts