The d.c. and a.c. cyclic voltammetries of horse heart ferricytochrome c have been investigated and it is shown that in the presence of 4,4′-bipyridyl, the electrochemistry corresponds to a quasi-reversible one-electron process, from which an E° value of +0·25 V vs. normal hydrogen electrode can be derived.
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Eddowes et al. (1977) studied this question.