Abstract
The reduction of cytochrome c by thioglycolic acid was found to be extremely sensitive to metal catalysis. The rate of the uncatalyzed reaction was negligible and independent of pH, indicating that thioglycolic acid cannot reduce cytochrome c directly. Both copper and iron act as catalysts with copper being superior to iron. The metal-catalyzed reaction appears to be independent of pH and the presence of oxygen but is sensitive to the presence of chelating agents. The reduction of cytochrome c by thioglycolic acid is also catalyzed by impurities present in oxidized glutathione. The rate of this reaction is sensitive to changes in pH and oxygen concentration but insensitive to changes in ionic strength. Chelating agents have no effect on the rate of this reaction. The data, therefore, suggest that the reduction of cytochrome c by thioglycolic acid can proceed via distinct mechanisms which are dependent on the nature of the catalyst.
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