Abstract
Poly(hippuric acid) modified glassy carbon electrode was used for the detection of dopamine in the presence of ascorbic acid in a pH 7.4 PBS medium by cyclic voltammetry and square-wave voltammetry. The major difficulty of the overlapped oxidation potential of ascorbic acid could be overcome through the distinct attractive ability of poly(hippuric acid) film to cationic dopamine. The results showed that the DA anodic peak current and the concentration of DA had a linear relationship in the range of 2.0×10−7−1.0×10−4 mol dm−3. The detection limit (S/N=3) obtained by square-wave voltammetry was 1.0×10−8 mol dm−3.
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