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Electron spin resonance studies of free radicals in solution III: pH dependence of thiyl free radical of cysteine

✍ Scribed by Jean C. Kertesz; Michael B. Wolf; Walter Wolf; Li-Ya A. Chen

Publisher
John Wiley and Sons
Year
1974
Tongue
English
Weight
465 KB
Volume
63
Category
Article
ISSN
0022-3549

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✦ Synopsis

An electron spin resonance flow technique was utilized to follow the concentration of thiyl free radicals (RS-) generated upon the oxidation of cysteine with ceric ion over the 0.25-7.5 pH range. The thiyl free radical concentration was seen to decrease with increasing pH in a manner dependent on the extent of ionization of cysteine. The formation of thiyl free radicals was favored by the proportion of thiol present in the positively charged form. The diminution of RS. spin concentration a t physiological pH was correlated with the increasing prevalence of singly and doubly negative thiolate ions. At acidic pH's below 1.5, thiyl free radical formation was depressed by solutions of high ionic strength. The utility of this technique in studying the potential role of thiyl free radicals in radioprotective processes is indicated.

Keyphrases Free radicals in solution-pH dependence of thiyl free radical formation from oxidation of cysteine, electron spin resonance Cysteine oxidation-pH dependence of thiyl free radical formation Electron spin resonance-monitoring, pH dependence of thiyl free radical formation from oxidation of cysteine Recent studies in this laboratory identified and characterized thiyl (RS -) and related free radicals 5877( 1955).

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