The Antioxidant Activity of Quercetin in Water Solution

Overview

Journal Biomimetics (Basel)

Date 2019 May 21

PMID 31105172

Citations 22

Authors

Riccardo Amorati

Andrea Baschieri

Adam Cowden

Luca Valgimigli

Affiliations

Soon will be listed here.

Abstract

Despite its importance, little is known about the absolute performance and the mechanism for quercetin's antioxidant activity in water solution. We have investigated this aspect by combining differential oxygen-uptake kinetic measurements and B3LYP/6311+g (d,p) calculations. At pH = 2.1 (30 °C), quercetin had modest activity ( = 4.0 × 10 M s), superimposable to catechol. On raising the pH to 7.4, reactivity was boosted 40-fold, trapping two peroxyl radicals in the chromen-4-one core and two in the catechol with of 1.6 × 10 and 7.0 × 10 M s. Reaction occurs from the equilibrating mono-anions in positions 4' and 7 and involves firstly the OH in position 3, having bond dissociation enthalpies of 75.0 and 78.7 kcal/mol, respectively, for the two anions. Reaction proceeds by a combination of proton-coupled electron-transfer mechanisms: electron⁻proton transfer (EPT) and sequential proton loss electron transfer (SPLET). Our results help rationalize quercetin's reactivity with peroxyl radicals and its importance under biomimetic settings, to act as a nutritional antioxidant.

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