However, a drop in current was observed in Figs. 4 and 5 when compared to the other earlier figures, e.g. Figs. 2 and 3,a 3% (w/v) turnip peroxidase disc with 2 mM H2O2 concentra-tion produced an average current of ca. 5.26 A at a potential of −0.10 V. Whereas in Figs. 4 and 5,