Poly (phenosafranine)/SAOS Modified Sensor for the Determination of Dopamine and Uric Acid

The phenosafranine (PS+) and sodium alpha olefin sulphonate (SAOS) used as the modifiers for the modification of bare carbon paste electrode (BCPE). Electropolymerization and immobilization technique has been employed for the modification of carbon paste electrode to get poly (phenosafranine)/SAOS/MCPE. The electrocatalytic behaviour of the modified electrode was investigated by voltammetric techniques. The modified electrode exhibits excellent electrocatalytic activity towards the determination of dopamine (DA) and uric acid (UA) in presence of 0.2 M phosphate buffer solution (PBS) at pH 7.4 with the scan rate of 50 mVs-1. The various parameters like effects of scan rate, concentration and pH variation was studied and the overall electrode process was found to be adsorption-controlled at poly (phenosafranine)/SAOS/MCPE. Both dopamine and uric acid exhibit good detection limits at modified electrode (4.43 μM and 4.18 μM respectively). Hence, the proposed sensor shows good sensitivity towards the determination of DA and UA individually and simultaneously.