Electrocatalytic oxidation and determination of dopamine in the presence of ascorbic acid and uric acid at a poly (4-(2-pyridyl-azo)-resorcinol) modified glassy carbon electrode

A sensitive and selective electrochemical method for the determination of dopamine (DA) was developed using a 4(2-Pyridylazo)-Resorcinol (PAR) polymer film modified glassy carbon electrode (GCE). The PAR polymer film modified electrode shows excellent electrocatalytic activity toward the oxidation of DA in a phosphate buffer solution (PBS) (pH 4.0). The linear range of 5.0 x 10(-6) -3.0 x 10(-5) M and detection limit of 2.0 x 10(-7) M were observed. Simultaneous detection of AA, DA and UA has also been demonstrated on the modified electrode. This work provides a simple and easy approach to selective detection of DA in the presence of AA and UA.