title: Electrooxidation of morin hydrate at a Pt electrode studied by cyclic voltammetry.
abstract: The process and the kinetics of the electrochemical oxidation of morin in an anhydrous electrolyte have been investigated using cyclic and differential pulse voltammetry. The oxidation mechanism proceeds in sequential steps related to the hydroxyl groups in the three aromatic rings. The oxidation of the 2',4'dihydroxy moiety at the B ring of morin occurs first, at very low positive potentials, and is a one-electron, one-proton irreversible reaction. The rate constant, electron transfer coefficient and diffusion coefficients involved in the electrochemical oxidation of morin were determined. The influence of the deprotonation of the ring B hydroxyl moiety is related to the electron/proton donating capacity of morin and to its radical scavenging antioxidant activity.
authors.affiliation: Technical University of Lodz, Institute of Polymer and Dye Technology, Faculty of Chemistry, ul Stefanowskiego 12/16, 90-924 Lodz, Poland. Electronic address: anna.masek@p.lodz.pl.
authors.forename: Anna
authors.initials: A
authors.lastname: Masek
authors.forename: Ewa
authors.initials: E
authors.lastname: Chrzescijanska
authors.forename: Marian
authors.initials: M
authors.lastname: Zaborski
mesh_terms: D000975:Antioxidants / Q000737:chemistry*; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods*; D004566:Electrodes; D005419:Flavonoids / Q000737:chemistry*; D007700:Kinetics; D015394:Molecular Structure; D010084:Oxidation-Reduction; D047309:Flavones
chemical_list: D000975:Antioxidants; D005419:Flavonoids; C008548:morin; D047309:Flavones
keywords: Antioxidants; Cyclic voltammetry; Electrochemical oxidation; Morin