The reduction of cytochrome c by free radicals in irradiated solutions

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Abstract
Aqueous solutions of cyto-chrome c (10-5 [image]) on irradiation with X-rays in the absence of O2 and in the presence of 0.1 [image] benzoate or succinate yielded reduced cytochrome c identical with the product of enzymic reduction. In the presence of methanol, ethanol or n-butanol, a product not identical with that resulting on enzymic reduction is also obtained. This same unusual product is formed in the presence of H2. Its spectrum is similar to that of porphyrin c. The results are interpreted in terms of the reactions of organic free radicals produced in these systems.