Comparative kinetics of thiol oxidation in two distinct free-radical generating systems: SIN-1 versus AAPH

Shan Chu Ho, Shih Jiuan Chiu, Teh Min Hu

研究成果: 雜誌貢獻文章同行評審

3 引文 斯高帕斯(Scopus)

摘要

To study oxidative stress in biological systems, chemical compounds capable of producing free radicals have been widely used. Here, we compared two free-radical generators, 3-morpholinosydnonimine (SIN-1) and 2,2′-azo-bis(2-amidinopropane) hydrochloride (AAPH), by measuring the thiol oxidation kinetics of various thiols. We found that SIN-1 is >30 times potent in causing thiol oxidation than AAPH. Kinetic simulations revealed that in the SIN-1 system (0.1 mM), superoxide, nitrogen dioxide and carbonate radicals are the major reactive species which, in combination, induce ∼50% of thiol molecules to undergo one-electron oxidation, thereby forming the thiyl radical which propagates further thiol oxidation by direct coupling with thiolates. Similarly, the alkyl peroxyl radical derived from AAPH (3 mM) initiates comparable extent of one-electron oxidation and formation of the thiyl radical. In conclusion, our study provides experimental and theoretical evidence that SIN-1 is mainly an one-electron oxidizing agent that can be functionally mimicked by AAPH.

原文英語
頁(從 - 到)1190-1200
頁數11
期刊Free Radical Research
46
發行號10
DOIs
出版狀態已發佈 - 十月 2012

ASJC Scopus subject areas

  • Biochemistry

指紋 深入研究「Comparative kinetics of thiol oxidation in two distinct free-radical generating systems: SIN-1 versus AAPH」主題。共同形成了獨特的指紋。

引用此