title: Chain-breaking activity of resveratrol and piceatannol in a linoleate micellar model.
abstract: This study investigated the in vitro protective effects of three derivatives of resveratrol, i.e., piceatannol (trans-3,5,3',4'-tetrahydroxystilbene), PDM2 (1,3-dichloro-5-[(1E)-2-(4-chlorophenyl)ethenyl]-benzene) and PDM11 ((E)-5-[2-(4-chlorophenyl)ethenyl]-1,3-dimethoxyphenyl-ethene), compared with resveratrol as reference compound, against oxidation of linoleate micelles (10(-2)M) initiated by radiolysis-generated hydroxyl radicals. Lipid peroxidation was monitored by conjugated dienes (differential absorbance at 234nm), and by hydroperoxides (reverse phase HPLC with chemiluminescence detection). The higher the concentration of resveratrol or piceatannol (from 10(-5)M to 10(-4)M), the stronger the antioxidant ability. Piceatannol, with the presence of an additional hydroxyl group, showed a better antioxidant effect than resveratrol for a given concentration (competition with the fatty acid to scavenge lipid peroxyl radicals LOO), whereas PDM2 and PDM11, without any hydroxyl group, did not exhibit any significant protective effect. A lower limit for the LOO rate constant has been estimated for piceatannol (>/=1.4x10(5)M(-1)s(-1)) and for resveratrol (>/=0.3x10(5)M(-1)s(-1)).
authors.affiliation: EA 3617, Département de Biochimie, Faculté des Sciences Pharmaceutiques et Biologiques, Université Paris Descartes, 75006 Paris, France.
authors.forename: Yara
authors.initials: Y
authors.lastname: Rhayem
authors.forename: Patrice
authors.initials: P
authors.lastname: Thérond
authors.forename: Laurent
authors.initials: L
authors.lastname: Camont
authors.forename: Martine
authors.initials: M
authors.lastname: Couturier
authors.forename: Jean-Louis
authors.initials: JL
authors.lastname: Beaudeux
authors.forename: Alain
authors.initials: A
authors.lastname: Legrand
authors.forename: Daniel
authors.initials: D
authors.lastname: Jore
authors.forename: Monique
authors.initials: M
authors.lastname: Gardés-Albert
authors.forename: Dominique
authors.initials: D
authors.lastname: Bonnefont-Rousselot
mesh_terms: D002627:Chemistry, Physical / Q000379:methods; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004307:Dose-Response Relationship, Radiation; D016166:Free Radical Scavengers / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D017665:Hydroxyl Radical; D019787:Linoleic Acid / Q000737:chemistry*; D015227:Lipid Peroxidation; D008823:Micelles; D008956:Models, Chemical; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D000077185:Resveratrol; D013267:Stilbenes / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D016166:Free Radical Scavengers; D008823:Micelles; D013267:Stilbenes; D017665:Hydroxyl Radical; C041525:3,3',4,5'-tetrahydroxystilbene; D019787:Linoleic Acid; D000077185:Resveratrol; D010100:Oxygen