Kinetics of bimolecular decay of α‐tocopheroxyl free radicals studied by ESR

FEBS Letters

Rousseau-Richard, C.¹  Martin, R.¹  Richard, C.¹ 

[1] Laboratoire de Chimie Radicalaire, UA 328 du CNRS, Universite´de Nancy I, BP 239, 54506 Vœuvre Cedex, France

关键词: α-Tocopheroxyl;    Bimolecular decay;    Kinetics;    Solvent effect;    ESR;   

DOI  :  10.1016/0014-5793(88)80448-4

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

The kinetics of bimolecular decay of α-tocopheroxyl free radicals (T^.) was studied by ESR mainly in ethanol and heptanol solvents. A second-order kinetic law was observed during the whole course of reaction (-d[T^.]d t = 2 k[T^.]²) and the following rate constants were determined with good accuracy in the temperature range 281–321 K: ethanol: log(2 k) = 8.2 ± 0.5 — (6.6±0.7 kcal/mol)/(2.3 RT) M⁻¹·s⁻¹; heptanol: log(2 k)=6.1±0.4-(4.3±0.6 kcal/mol)/(2.3 RT) M⁻¹.s⁻¹. The global rate constant clearly increases with solvent polarity.

【 授权许可】

Unknown