title: Antioxidant and antiradical activities of flavonoids.
abstract: The relationship between the structure of 42 flavonoids and their antioxidant and antiradical activities was elucidated by heat-induced oxidation in a beta-carotene and linoleic acid system and by the 1,1-diphenyl-2-picrylhydrazyl decoloration test. From seven structurally divergent groups of flavonoids, only flavonols with a free hydroxyl group at the C-3 position of the flavonoid skeleton showed high inhibitory activity to beta-carotene oxidation. Antiradical activity depended on the presence of a flavonol structure or free hydroxyl group at the C-4' position. The effect of the 4'-hydroxyl was strongly modified by other structural features, such as the presence of free hydroxyls at C-3 and/or C-3' and a C2-C3 double bond.
authors: Department of Biochemistry, Institute of Soil Science and Plant Cultivation, ul. Czartoryskich 8, 24-100 Pulawy, Poland. burda@iung.pulawy.pl
authors: S
authors: S
authors: Burda
authors: W
authors: W
authors: Oleszek
mesh_terms: D000975:Antioxidants; D005419:Flavonoids / Q000737:chemistry* / Q000378:metabolism*; D044948:Flavonols; D006031:Glycosylation; D008745:Methylation; D015394:Molecular Structure; D010084:Oxidation-Reduction; D013329:Structure-Activity Relationship
chemical_list: D000975:Antioxidants; D005419:Flavonoids; D044948:Flavonols