Fig. 4From: Nonenzymatic coated screen-printed electrode for electrochemical determination of acetylcholineChronoamperograms obtained at MCSNP/SPE in 0.1 M PBS (pH 7.0) for different concentration of ACh. The numbers 1–4 correspond to 0.1, 0.8, 1.7 and 3.0 mM of ACh. Insets: Plots of I vs. t−1/2 obtained from chronoamperograms 1–4 (a), and plot of the slope of the straight lines against ACh concentration (b)Back to article page