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(a) Cyclic voltammograms for different concentrations of tryptophan in the Fc/PVP/GCE in PBS (pH 7), V = 100 mV s−1. (b) Cathodic differential pulse voltammograms for different concentrations of tryptophan at the Fc/PVP/GCE in PBS (pH 7), V = 100 mV s−1.
