Abstract
Cytochrome c′ from Chromatium vinosum (CVCP) was immobilized at a surface-modified gold electrode. Characterization of the CVCP electrode showed a quasi-reversible, diffusionless electrochemical redox behavior of the surface adsorbed protein with a formal potential of −128±5 mV vs. Ag/AgCl. The heterogeneous electron transfer rate constant of adsorbed CVCP was determined to be about 50 s −1. Different immobilization strategies were compared. The interaction of the immobilized CVCP with nitric oxide (NO) was investigated and applied for a primary amperometric detection of NO in solution.
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