影像科学与光化学 ›› 1992, Vol. 10 ›› Issue (4): 347-353.DOI: 10.7517/j.issn.1674-0475.1992.04.347

• 研究论文 • 上一篇    下一篇

竹红菌甲素敏化氧化还原型谷胱甘肽中的类型Ⅰ和类型Ⅱ反应

王能辉, 安静仪, 鲁崇贤, 蒋丽金   

  1. 中国科学院感光化学研究所, 北京 100101
  • 收稿日期:1991-10-14 修回日期:1992-03-25 出版日期:1992-11-20 发布日期:1992-11-20
  • 通讯作者: 蒋丽金
  • 基金资助:
    国家自然科学基金

TYPE Ⅰ AND Ⅱ SENSITIZED PHOTOOXIDATION OF GluSH BY HYPOCRELLIN A

WANG NENG-HUI, AN JING-YI, LU CHONG-XIAN, JIANG LI-JIN   

  1. Institute of Photographic Chemistry, Academa Simca, Beijing 100101, P. R. China
  • Received:1991-10-14 Revised:1992-03-25 Online:1992-11-20 Published:1992-11-20

摘要: 本文研究了竹红菌甲素和还原型谷胱甘肽(GluSH)间的光诱导氧化还原作用。甲素是3,10-二羟基-4,10-苝醌衍生物。在GluSH作为电子给体时,甲素经受可见光诱导的单电子还原,生成年醌自由基或二氢甲素,取决于pH值,同时GluSH被氧化。甲素的单电子还原量子效率随pH值增加而增加。在充氧溶液中甲素敏化氧化GluSH的反应通过类型Ⅰ和Ⅱ的混合机制进行。用ESR检测到了通过Fenton反应产生的羟基自由基。在脂质体包裹的甲素溶液中用动力学测定方法证明了甲素敏化GluSH的氧化是通过类型Ⅱ机制进行的。

关键词: 竹红菌甲素, 还原型谷胱甘肽, 光诱导电子转移, 光氧化, 活性氧

Abstract: The photoinduced redox reaction between hypocrellin A and reduced glutathione (GluSH) was investigated.Hypocrellin A, a derivative of 3, 10-dihydroxy-4, 9-perylenequinone, undergoes light-induced one-electron reduction in the presence of GluSH as electron donor.Depending on the PH of the medium the product can be semiquinone radical or dihydrohypoc-rellin A.The quantum yield of one-electron reduction of hypocrellin A increased with increasing pH.The hypocrellin A sensitized oxidation of GluSH proceeds through the mixed mechanism of Foote Type Ⅰ and Type Ⅱ in aerated solution, and the hydroxy radical generated through Fenton reaction was also detected by ESR.Hypocrellin A sensitized oxidation of GluSH in aerated lipsome solution follows the Foote Type Ⅱ mechanism, which was verified by dynamic measurements.

Key words: hypocrellin A, reduced glutuhione, photoinduced electron transfer, pho-tooxidation, semiquinone radical, active oxygen