维生素E电化学氧化机理的光谱电化学表征

THE SPECTROELECTROCHEMICAL CHARACTERIZATION OF ELECTROCHEMICAL OXIDATION MECHANISM OF VITAMIN E

摘要: 用循环伏安法,研究了维生素E在热解石墨电极的电化学氧化反应机理。分析了反应历程。实验结果表明,维生素E在热解石墨和铂电极的电极过程为受扩散控制的准可逆ECE电极过程。用网状石墨和状铂电极的紫外吸收光谱电化学的实验结果为上述机理提供了依据。

Abstract: The electrochemical oxidation mechanism of vitamin E(Ⅴ_E) on pyrolytic graphite electrode (PGE) was studied by cyclic voltammetry. The results of experiment showed that the oxidative mechanism of Ⅴ_E was a quasi-reversible ECE process controlled by diffusion on PGE and the same on platinum electrode (PtE). The results of absorption spectroelectrochemistry experiment verified the oxidative mechanism of Ⅴ_E. It is clear that the oxidation of Ⅴ_E is a quasi-reversible 2e process to a divalent cation and followed by hydrolysis reaction to the quinone or semi-quinone compounds in acidic solution.