PULSE RADIOLYSIS STUDY OF THE INTERACTION OF α-TOCOPHEROL AND TRICHLOROMETHYL PEROXYL RADICAL CCl3O2·

ZHAO Yaping; QIAN Suping; YU Wenli; YAO Side; WANG Wenfeng; Wang Dapu

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PULSE RADIOLYSIS STUDY OF THE INTERACTION OF α-TOCOPHEROL AND TRICHLOROMETHYL PEROXYL RADICAL CCl₃O₂^·

更新时间：2023-05-04

- PULSE RADIOLYSIS STUDY OF THE INTERACTION OF α-TOCOPHEROL AND TRICHLOROMETHYL PEROXYL RADICAL CCl₃O₂^·
- Journal of Radiation Research and Radiation Processing Vol. 20, Issue 4, Pages: 231-234(2002)
- 作者机构：
  
  1.上海交通大学化学化工学院　上海　200240
  2.中国科学院上海原子核研究所辐射化学开放实验室　上海　201800
- 作者简介：
- 基金信息：
  
  国家自然科学基金(99QA14034)
- DOI：
  CLC：
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ZHAO Yaping, QIAN Suping, YU Wenli, et al. PULSE RADIOLYSIS STUDY OF THE INTERACTION OF α-TOCOPHEROL AND TRICHLOROMETHYL PEROXYL RADICAL CCl₃O₂^·. [J]. Journal of Radiation Research and Radiation Processing 20(4):231-234(2002)
DOI：

ZHAO Yaping, QIAN Suping, YU Wenli, et al. PULSE RADIOLYSIS STUDY OF THE INTERACTION OF α-TOCOPHEROL AND TRICHLOROMETHYL PEROXYL RADICAL CCl₃O₂^·. [J]. Journal of Radiation Research and Radiation Processing 20(4):231-234(2002) DOI：

摘要

采用脉冲辐解技术研究了α-生育酚清除三氯过氧自由基 (CCl,3,O,2,·)的反应机理和动力学。空气饱和的异丙醇与水的混合溶液 (含10,-2, M四氯化碳 ,CCl,4,) ,经脉冲辐解产生CCl,3,O,2,·。在上述体系中加入α-生育酚 ,记录到α-生育酚自由基在340nm和430nm 2个特征瞬态吸收峰。结果表明 ,α-生育酚与CCl,3,O,2,·通过氢转移进行反应 ,生成了α-生育酚自由基,其氢转移反应速率常数为 2.65×10,8,M,-1,s,-1,。

Abstract

The antioxidant activity of natural α-tocopherol (α-TH) is investigated towards trichloromethylperoxyl free radical (CCl,3,O,2,·,) by means of a pulse radiolysis technique. CCl,3,O,2,·, was generated from a pulsed solution containing 2-propanol (2M) and CCl,4,(10,-2,M) in the presence of air. The observed spectrum showed two transient absorption peaks at 340nm and 430nm, which were assigned to α-TH radical. The rate constant was calculated to be 2.65×10,4, M,-1,s,-1, which suggested a quick interaction between α-TH and CCl,3,O,2,·,. The reaction between α-TH and CCl,3,O,2,·, may go on via hydrogen transfer mechanism.

关键词

α-生育酚三氯过氧自由基脉冲辐解速率常数

Keywords

α-tocopherolTrichloromethyl peroxyl radicalPulse radiolysisRate constant

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