The oxidation-reduction potentials of cytochrome C

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Abstract
Coolidge (1932) studied the oxidation-reduction potentials of cytochrome C. His chief results may be summarized as follows. (1) The E o of cytochrome either in yeast cells or in artificial preparations is the same, viz., +0·260 volts. (2) In solutions of cytochrome C prepared by extraction of yeast with ammonia and by Keilin's method (1930), hæmatin iron accounts for only one-third of the total iron; the rest of the iron is in tire form of a loose iron-protein complex. (3) The low concentration of cytochrome in the living cell and the positive potentials which its solutions record make it unlikely that cytochrome can function as a respiratory catalyst. The results of Coolidge are open to serious criticism.

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