Abstract
1. (a) Ethyl hydrogen peroxide, fatty acid peroxides, hydrogen peroxide or p-dioxane peroxide caused the reduction of ferricytochrome c by NADH. Benzoyl peroxide was much less effective in causing this reduction. 2. (b) O 2 had no effect on the rates of oxidation of NADH or reduction of cytochrome c; but the presence of O 2 did change the mechanism of the reaction. This was demonstrated through the use of superoxide dismutase which inhibited the reduction of cytochrome c in the presence of O 2 but had no effect in the absence of O 2. 3. (c) Ethyl hydrogen peroxide was converted to acetaldehyde in the course of this reaction. Indeed, ethyl hydrogen peroxide was converted to acetaldehyde by reaction with ferricytochrome c, methemoglobin or hemin but not with ferrocytochrome c or with ferricyanide. 4. (d) A mechanism has been proposed which satisfactorily accounts for these observations.
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