One-electron oxidation of antioxidants: A kinetic-thermodynamic correlation

The values of the bimolecular rate constants for the reactions of 2,2′-azino-bis(3-ethylbenz-thiazoline-6-sulfonic acid) radical cation with epicatechin (((2.4 ± 0.2)) s −1 M −1 ), and epigallocatechingallate ((29 ± 5) s −1 M −1 ) were obtained by spectrophotometric measurements. We propose a correl...

Full description

Saved in:
Bibliographic Details
Published in:Redox report : communications in free radical research 2013-09, Vol.18 (5), p.205-209
Main Authors: Villata, Laura S., Berkovic, Andrea M., Gonzalez, Mónica C., Mártire, Daniel O.
Format: Article
Language:English
Subjects:
ABTS
Antioxidants
Benzothiazoles - chemistry
Catechin - chemistry
Electrons
Epicatechin
Epigallocatechingallate
Gallic Acid - analogs & derivatives
Gallic Acid - chemistry
Kinetic-thermodynamic correlation
Kinetics
Oxidation-Reduction
Sulfonic Acids - chemistry
Thermodynamics
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The values of the bimolecular rate constants for the reactions of 2,2′-azino-bis(3-ethylbenz-thiazoline-6-sulfonic acid) radical cation with epicatechin (((2.4 ± 0.2)) s −1 M −1 ), and epigallocatechingallate ((29 ± 5) s −1 M −1 ) were obtained by spectrophotometric measurements. We propose a correlation between the Gibbs energy ΔG o for the one-electron charge-transfer reactions from several antioxidants to radical species and the rate constants of the corresponding bimolecular reactions. This correlation can be used to predict rate constants of reactions of known ΔG o values.
ISSN:1351-0002
1743-2928
DOI:10.1179/1351000213Y.0000000063