512692.fig.002a
(a)
512692.fig.002b
(b)
Figure 2: (a) Cyclic voltammograms of  M dopamine at BGPE (solid line) and at poly(XO)/GPE; First cycle (dashed line) and Second Cycle (dotted line) in 0.2 M PBS of pH 7 at sweep rate 50  mV s−1. (b) Cyclic voltammograms of  M dopamine for 20 multiple cycles in 0.2 M PBS at poly(XO)/GPE at sweep rate 50  mV s−1.