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Issue 26, 2013

On the radical scavenging activity of isoflavones: thermodynamics of O–H bond cleavage

Author affiliations

Abstract

We have performed Density Functional Theory B3LYP/6-311++G** calculations of reaction enthalpies of antioxidant action mechanisms for nine isoflavones. O–H bond dissociation enthalpies, ionization potentials, proton dissociation enthalpies, proton affinities and electron transfer enthalpies related to Hydrogen Atom Transfer (HAT), Single Electron Transfer-Proton Transfer (SET-PT) and Sequential Proton-Loss Electron-Transfer (SPLET) mechanisms were investigated in gas- and solution-phases. Studies on the radical scavenging ability of isoflavones, contrary to various flavonoids, are still scarce. Thus, understanding of its thermodynamics can be considered beneficial. The selection of isoflavones (daidzein, formononetin, genistein, biochanin A, prunetin, 6-hydroxydaidzein, glycitein, orobol and santal) enables us to evaluate the effects of various structural features, such as the presence of methoxy (4′-OMe, 6-OMe, 7-OMe) and hydroxy (3′-OH, 5-OH, 6-OH) groups, on studied reaction enthalpies. The obtained results show that HAT can be attributed predominantly to the B ring, while SPLET takes place preferentially in the A ring, as was also indicated in experimental works.

Graphical abstract: On the radical scavenging activity of isoflavones: thermodynamics of O–H bond cleavage

Supplementary files

Article information


Submitted
09 Jan 2013
Accepted
29 Apr 2013
First published
30 Apr 2013

Phys. Chem. Chem. Phys., 2013,15, 10895-10903
Article type
Paper

On the radical scavenging activity of isoflavones: thermodynamics of O–H bond cleavage

J. Lengyel, J. Rimarčík, A. Vagánek and E. Klein, Phys. Chem. Chem. Phys., 2013, 15, 10895 DOI: 10.1039/C3CP00095H

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