Electrochemical Studies of Dopamine, Ascorbic Acid and Their Simultaneous Determination at a Poly (Rosaniline) Modified Carbon Paste Electrode: A Cyclic Voltammetric Study

A sensitive and selective electrochemical method for the determination ofdopamine was developed using a rosaniline polymer film modified carbon paste electrode.the rosaniline polymer film modified electrode showed excellent electrocatalytic activitytowards the oxidation of dopamine (da) in phosphate buffer solution (ph 7.0). theinterference studies show that the modified electrode exhibits excellent selectivity in thepresence of ascorbic acid (aa). a significant improvement in cyclic voltammetric responsesto da and aa (well-defined voltammetric peaks at potentials around 205, -43 mv for daand aa respectively) and a prominent enhancement of voltammetric sensitivity was observedat the rosaniline polymer film modified cpe. hence, this work provides a simple and easyapproach to selective detection of dopamine in the presence of ascorbic acid.