458245.fig.004
Figure 4: Current versus the square root of scan rate plots of Mg-MCM-41/PVA/Lac/Au electrode in pH 4.8 acetate buffer solution with 0.05 mM catechol. Inset: CVs of the PVA/Lac/Au electrode in pH 4.8 acetate buffer solution with 0.05 mM catechol at different scan rates from inner to outer: 10, 30, 50, 70, and 90 mV*s−1.