The anodic peak potentials shifted toward positive values when the scan rate was increased, according to the following linear expressions:
View the MathML sourceEpaGua(V)=1.047+0.056logν(V/s);r=0.9987
View the MathML sourceEpaAde(V)=1.348+0.069logν(V/s);r=0.9994
Linear correlations confirmed surface-controlled oxidation processes resulting from the adsorption of the investigated compounds on ACSE.
According to the fact that purine nucleobases are able to be absorbed onto a porous surface of ACSE, the effects of an accumulation time (tacc) and an accumulation potential (Eacc) on the stripping peaks of Gua and Ade were investigated. According to the experimental conditions, ACSE was immersed in a stirring PBS containing each compound. After a fixed time, the electrode was transferred to a pure PBS and a stripping voltammogram was recorded.