The experiments were performed in 0.1 M phosphate buffer, pH 6.5, and in (A) and (B) the solution contained 10 mg/ml of T. hirsuta laccase. (A) Cyclic voltammogramms recorded at different scan rates; start potential, 80 mV versus NHE. Inset, the dependence of anodic and cathodic peak current on the square root of the potential scan rate (V/s). (B) Cyclic voltammograms recorded at 10 mV/s in a broader potential window; start potential, 1030 mV versus NHE. Curve 1, control measurement in the absence of the laccase; curve 2, with laccase.