Reversible potentials (Eac0) of the surface confined Fe3+/2+ redox couple derived from the a.c. voltammograms (f = 219 Hz)a obtained from CNT electrodes modified with hemin, wt cyt b5, E48G/E49G cyt b5, P450c17, and their combinations.

a Average of the potentials of the central minimum in the 6th a.c. harmonic (envelope presentation, in Fig 3) from the forward and backward d.c. potential sweep directions.b Values are reproducible to ±0.001 V.c Hemin adsorbed on the electrode pre-modified with wt cyt b5.d either wt or E48G/E49G cyt b5 adsorbed on the electrode pre-modified with P450c17.Reversible potentials (Eac0) of the surface confined Fe3+/2+ redox couple derived from the a.c. voltammograms (f = 219 Hz)a obtained from CNT electrodes modified with hemin, wt cyt b5, E48G/E49G cyt b5, P450c17, and their combinations.