Cytochrome half-wave potential

Figure 4. Concentration dependence of limiting current / (O), capacity decrease AC/Cq ( ), and difference between half-wave potential C/1/2 and normal potential Uq (x) for cytochrome c. [Courtesy F. Scheller, Bioelectrochem. Bioenerg. 4, 157 (1975).]...

Differential capacitance measurements by Niki et for cytochrome C3 from D. vulgaris, strain Miyazaki, were consistent with irreversible, diffusion-limited adsorption for 4-s drop times above a concentration of 10 fiM. The surface excess of cytochrome C3 was calculated to be 0.92 x 10 " mole/cm. Niki etal also investigated the a.c. polarographic behavior of cytochrome C3 at the reversible half-wave potential. The capacitive peak height was frequency independent while the resistive peak height decreased with increasing frequency to a value of zero above 2000 Hz. These results were fit to a Laitinen-Randles equivalent circuit yielding an n value of... 

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