Fig. 9
A SDLSVs of AA at the PVP-GR/GCE in the presence of 20 μM DA and 50 μM UA. a AA concentrations (from a to f): 100, 200, 400, 600, 80, 1000 μM; b AA concentrations (from g to n): 4, 6, 8, 10, 20, 40, 60, 80 μM. c Plots of peak height vs. AA concentration in the range of 4–1000 μM. B SDLSVs of DA at the PVP-GR/GCE in the presence of 1.0 mM AA and 50 μM UA. a DA concentrations (from a to o): 0.2, 0.4, 0.6, 0.8, 1.0, 2.0, 4.0, 6.0, 8.0, 10, 20, 40, 60, 80 and 100 μM; b DA concentrations (from p to u): 0.02, 0.04, 0.06, 0.08, 0.1, 0.2 μM; c Plots of peak height vs. DA concentration in the range of 0.2–100 μM and d in the range of 0.02–0.2 μM. C SDLSVs of UA at the PVP-GR/GCE in the presence of 1.0 mM AA and 20 μM DA. a UA concentrations (from a to k): 1.0, 2.0, 4.0, 6.0, 8.0, 10, 20, 40, 60, 80, and 100 μM; b UA concentrations (from l to s): 0.04, 0.06, 0.08, 0.1, 0.2, 0.4, 0.6, 0.8 μM; c Plots of peak height vs. UA concentration in the range of 1.0–100 μM and d in the range of 0.04–1.0 μM. 0.1 M PBS (pH 6.0) for the supporting electrolyte, 0.0 V for the accumulation potential, 60 s for the accumulation time, 0.1 V s−1 for the scan rate. Error bars represent SD, n = 3