Cyclic Voltammetric Investigations of Dopamine at Alizarin Modified Carbon Paste Electrode

Electrochemical response of dopamine at alizarin modified carbon paste electrode has been studied by cyclic voltammetric technique in 0.1M acetate buffer solution at pH 7.0. The modified electrode exhibited strong promoting effect and stability towards the detection of dopamine. From the studies of scan rate effect the overall electrode process was found to be both adsorption and diffusion controlled. The concentration effect reveals that the detection limit of dopamine was 2.37 x 10-7 M and pH effect suggested that equal number of protons and electrons were involved in the electrochemical oxidation of dopamine. Alizarin modified carbon paste electrode showed excellent electrocatalytic effect towards the detection of dopamine.