Voltammetric Determination of Folic acid in presence of Dopamine and Ascorbic Acid at Poly (Alanine) Modified Carbon Paste Electrode

A procedure for the electropolymerization of alanine on the surface of bare carbon paste electrode (CPE) in presence 0.2 M acetate buffer (pH 5.0) solution as a supporting electrolyte using cyclic voltammetric technique was developed. The optimization of electropolymerized modified carbon paste electrode (MCPE) was achieved at 25 cycles. Further the poly (alanine) MCPE was used for the electrochemical detection for the folic acid (FA) at pH 5.0 and shows excellent electrocatalytic activity towards FA when compared to the bare CPE. The various parameters such as effect of scan rate, concentration of FA and the effect of pH were studied at MCPE. From the scan rate it was found that the electrode process was adsorption-controlled process. The limit of detection of FA was calculated at MCPE and the simultaneous determination FA, DA and AA shows three well defined oxidation peaks at poly (alanine) MCPE.