title: Antioxidant activity of Centaurium erythraea infusion evidenced by its superoxide radical scavenging and xanthine oxidase inhibitory activity.
abstract: Centaurium erythraea Rafin. (Gentianaceae) has long been used in traditional medicine. This plant contains considerable amounts of polyphenolic compounds, namely, xanthones and phenolic acids as the main constituents. Because phenolic groups exhibit activity as radical scavengers and/or metal chelators, this study evaluated the superoxide radical scavenging properties of a lyophilized infusion obtained from C. erythraea flowering tops. Superoxide radical scavenging activity was assayed using enzymatic (xanthine/xanthine oxidase) and nonenzymatic (NADH/phenazine methosulfate) superoxide generating systems. This study provided evidence that C. erythraea exhibits interesting antioxidant properties, expressed either by the capacity to scavenge superoxide radical or to noncompetitively inhibit xanthine oxidase. The main phenolic compounds present in this extract were several esters of hydroxycinnamic acids, namely, p-coumaric, ferulic, and sinapic acids.
authors.affiliation: CEQUP/Serviço de Farmacognosia and CEQUP/Serviço de Toxicologia, Faculdade de Farmácia, Universidade do Porto, R. Aníbal Cunha 164, 4050-047 Porto, Portugal.
authors.forename: P
authors.initials: P
authors.lastname: Valentão
authors.forename: E
authors.initials: E
authors.lastname: Fernandes
authors.forename: F
authors.initials: F
authors.lastname: Carvalho
authors.forename: P B
authors.initials: PB
authors.lastname: Andrade
authors.forename: R M
authors.initials: RM
authors.lastname: Seabra
authors.forename: M L
authors.initials: ML
authors.lastname: Bastos
mesh_terms: D000975:Antioxidants / Q000494:pharmacology*; D002851:Chromatography, High Pressure Liquid; D016166:Free Radical Scavengers; D020128:Inhibitory Concentration 50; D010946:Plants, Medicinal / Q000737:chemistry*; D014969:Xanthine Oxidase / Q000037:antagonists & inhibitors*
chemical_list: D000975:Antioxidants; D016166:Free Radical Scavengers; D014969:Xanthine Oxidase