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

Reddy, Sathish and Swamy, Kumara BE and Vasan, HN and Jayadevappa, H (2012) ZnO and ZnO/polyglycine modified carbon paste electrode for electrochemical investigation of dopamine. In: Analytical Methods, 4 (9). pp. 2778-2783.

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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. This journal is © The Royal Society of Chemistry 2012.

Item Type:	Journal Article
Publication:	Analytical Methods
Publisher:	Royal Society of Chemistry
Additional Information:	Copyright for this article belongs to the Royal Society of Chemistry
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	18 Sep 2012 04:50
Last Modified:	18 Sep 2012 04:50
URI:	http://eprints.iisc.ac.in/id/eprint/45039

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