Abstract
Cysteamine and reduced glutathione were shown to act synergistically as peroxidase-oxidase substrates as measured by oxygen consumption and Nitro Blue Tetrazolium reduction. Cysteine methyl ester could be substituted for cysteamine and N-acetylcysteine and penicillamine could be substituted for glutathione. The involvement of reduced oxygen species and the effects of pH and chloride were studied. A possible mechanism of peroxidase-oxidase oxidation of cysteamine and glutathione is proposed. These studies show that peroxidase oxidase reactions can occur with close to physiological concentrations of peroxidase and thiols.
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