Dissociation energies of O-H bonds in natural antioxidants

被引：29

作者：

Denisova, T. G. ^{[1
]}

Denisov, E. T. ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka 142432, Moscow Region, Russia

来源：

RUSSIAN CHEMICAL BULLETIN | 2008年 / 57卷 / 09期

关键词：

antioxidant; gallate; reaction rate constant; model of intersecting parabolas; O-H bond; peroxy radical; tocopherol; ubiquinol; flavanone; flavone; bond dissociation energy;

D O I：

10.1007/s11172-008-0251-0

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The dissociation energies of O-H bonds in natural antioxidants were estimated from the kinetic data (rate constants of reactions of the antioxidants with the peroxy radicals). The calculations were performed using the method of intersecting parabolas. alpha-Tocopherol was used as a reference phenol with D (O-H) = 330 kJ mol(-1). The following groups of antioxidants were chosen for the estimation: tocopherols, their sulfur- and selenium-containing analogs, flavones, flavanones, and gallates. The discrepancy in the D (O-H) values for the same phenol by measurements of k(RO2 (center dot) + ArOH) of different authors does not exceed 2 kJ mol(-1). The D (O-H) values were calculated for 64 phenols.

引用

页码：1858 / 1866

页数：9

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