Poly(Succinic acid) Modified Carbon Paste Electrode for the Resolution of Dopamine in the presence of Ascorbic acid and Uric acid

A voltammetric electro chemical sensor was developed for the resolution study of dopamine and ascorbic acid by the electrochemically deposited succinic acid polymer on a carbon paste electrode at 50 mVs−1/Ag–AgCl. This modified electrode exhibited an excellent electrochemical catalytic activity towards the resolution of ascorbic acid (AA), dopamine (DA) and uric acid (UA) compared with bare carbon paste electrode. The effect of pH range from 5.5 to 8.0 was studied and the redox peak was pH dependent with a slope of 60 mV/pH and from the regression coefficient of the effect scan rate was shows the process is diffusion controlled. The DPV study of 57 to 438 μM concentration range of DA shows 34 μM detection limit. The oxidation potentials of AA, DA and UA at the poly succinic acid modified carbon paste electrode were shifted slightly negatively and the peak currents were much larger than the bare carbon paste electrode. The limit of detection for AA, DA and UA were 0.7 mM, 1.0 μM and 79 μM respectively. This succinic acid modified carbon paste electrode showed many merits in constancy, sensitivity, capability, economy and also applicable for real sample analysis.