Abstract

The catalytic activity of cobalt(II) porphyrinate in the oxidative degradation of β-carotene and lycopene by hydrogen peroxide is studied using spectroscopic methods. The kinetic parameters of the redox process are obtained, and its tentative mechanism is proposed. The catalytic activity is shown to depend on the composition of the coordination site and the presence of additional redox activators. Before oxidative degradation of tetraterpenes takes place, hydrogen peroxide gets coordinated to metal cation of the complex and is subsequently activated. The activation gives rise to a highly reactive intermediate that contains a radical on the methoxy moiety and can initiate free-radical oxidation.

中文翻译：

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八甲氧基取代的四苯基卟啉钴（II）在过氧化氢四萜氧化中的催化活性

摘要

利用分光光度法研究了卟啉钴（II）在过氧化氢对β-胡萝卜素和番茄红素的氧化降解中的催化活性。获得了氧化还原过程的动力学参数，并提出了其机理。已显示催化活性取决于配位点的组成和其他氧化还原活化剂的存在。在四萜类化合物发生氧化降解之前，过氧化氢与配合物的金属阳离子配位，随后被活化。活化产生高反应性的中间体，该中间体在甲氧基部分上含有一个基团，并且可以引发自由基氧化。