title: Antioxidant activity of flavonoids from Sideritis raeseri.
abstract: Nine 7-o-allosyl glucosides of 5,8-dihydroxy substituted flavones were isolated from a fraction of the methanol extract of the aerial parts of Sideritis raeseri Boiss et Heldr. subsp. raeseri. The structures were identified by spectroscopic methods. The antioxidant activity of this fraction, evaluated by the Co(II) EDTA-induced luminol chemiluminescence and by the DPPH scavenging activity, was found to be moderate. The activity can be related with the presence of 5- and 8-o-disubstituted flavones.
authors.affiliation: Laboratory of Pharmacognosy, Department of Pharmacy, School of Health Sciences, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
authors.forename: C N
authors.initials: CN
authors.lastname: Gabrieli
authors.forename: P G
authors.initials: PG
authors.lastname: Kefalas
authors.forename: E L
authors.initials: EL
authors.lastname: Kokkalou
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000302:isolation & purification; D002853:Chromatography, Liquid; D005419:Flavonoids / Q000737:chemistry* / Q000302:isolation & purification; D016166:Free Radical Scavengers / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D035261:Plant Components, Aerial; D010936:Plant Extracts / Q000737:chemistry; D031365:Sideritis; D013329:Structure-Activity Relationship
chemical_list: D000975:Antioxidants; D005419:Flavonoids; D016166:Free Radical Scavengers; D010936:Plant Extracts