Simultaneous Determination of Dopamine, Uric Acid and Ascorbic Acid with CTAB Modified Carbon Paste Electrode

A cation surfactant Cetyltrimethyl ammonium Bromide (CTAB) modified carbon paste electrode was fabricated and applied to simultaneous determination of ascorbic acid, dopamine and uric acid. The modified electrode resolved the overlapped voltammetric responses of ascorbic acid, dopamine and uric acid in to three well defined voltammetric peaks by cyclic voltammetry (CV). The results showed that the electrocatalytic activity of CTAB modified carbon paste electrode (CTABMCPE) was more excellent when compared to bare CPE. The scan rate and concentration effect were linear with anodic peak current of dopamine. The modified electrode showed good selectivity, stability and antifouling properties