Abstract
The tripeptide Bz-Phe-Val-Arg-pNA adsorbs reversibly to platinum electrodes. We show how it is possible to determine the coverage of the tripeptide by measuring the electrode capacitance at a single frequency. The frequency dispersion of the electrode admittance fits a mathematical model with only two adjustable parameters. The model is based on a dispersion of time constants for the electrical events taking place at the electrode. Tunnelling is suggested to be a possible cause of such a dispersion.
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