Abstract
Electrochemical oxidation of dopamine at murexide modified carbon paste electrode was studied by cyclic voltammetric technique in 0.2M phosphate buffer solution at pH 7.4. The modified electrode exhibited strong promoting effect and stability toward the detection of dopamine. From the studies of scan rate effect the overall electrode process was found to be diffusion controlled. The concentration effect reveals that the detection limit and quantification limit of dopamine were 1.496×10−7M and 4.988×10−7M respectively. The effect of pH suggested that an equal number of protons and electrons were involved in the electrochemical oxidation of dopamine. The presence of Triton X-100 on the murexide modified carbon paste electrode showed excellent electrocatalytic effect toward the detection of dopamine.
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