Figure 2: Differential pulse voltammetric graph of H2O2 on the MWCN-chitosanperoxidase modified SPEs using 20 mM TMB as an electron-transfer mediator. The curves from (a) to (f) were obtained respectively from 10, 50, 100, 150, 200, 250 μM H2O2 in the acetate buffer (0.1 M, pH 5.0). The parameters set up for differential pulse voltammetry were set as follows: scanning range, 0.2-0.8 V; pulse amplitude, 50 mV; pulse duration, 20 s; pulse period, 200 s; scanning speed, 50 mV s-1.