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Issue 9, 2012
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ZnO and ZnO/polyglycine modified carbon paste electrode for electrochemical investigation of dopamine

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Abstract

Present work describes the characterization of commercially available ZnO and its electrochemical investigation of dopamine in the presence of ascorbic acid. ZnO was characterized by powder XRD, UV-visible absorption, fluorescence, infrared spectroscopy and scanning electron microscopy. The carbon paste electrode was modified with ZnO and ZnO/polyglycine for further electrochemical investigation of dopamine. The modified electrode shows good electrocatalytic activity towards the detection of dopamine with a reduction in overpotential. The ZnO/polyglycine modified carbon paste electrode (CPE/ZnO/Pgl) shows excellent electrochemical enhancement of peak currents for both dopamine (DA) and ascorbic acid (AA) and for simultaneous detection of DA in the presence of high concentrations of AA with 0.214 V oxidation peak potential differences between them at pH 7.4. From the scan rate variation and concentration, the oxidation of DA and AA was found to be adsorption-controlled. The use of CPE/ZnO/Pgl is demonstrated for the detection of DA in blood serum and injection samples.

Graphical abstract: ZnO and ZnO/polyglycine modified carbon paste electrode for electrochemical investigation of dopamine

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Article information


Submitted
27 Feb 2012
Accepted
24 May 2012
First published
30 May 2012

Anal. Methods, 2012,4, 2778-2783
Article type
Paper

ZnO and ZnO/polyglycine modified carbon paste electrode for electrochemical investigation of dopamine

S. Reddy, B. E. Kumara Swamy, H. N. Vasan and H. Jayadevappa, Anal. Methods, 2012, 4, 2778
DOI: 10.1039/C2AY25203A

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