TITLE

A sensitive determination of dopamine in the presence of ascorbic acid using a nafion-coated clinoptilolite-modified carbon paste electrode

AUTHOR(S)
Alpat, Senol; Alpat, Sibel Kilinc; Telefoncu, Azmi
PUB. DATE
October 2005
SOURCE
Analytical & Bioanalytical Chemistry;Oct2005, Vol. 383 Issue 4, p695
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A selective dopamine determination using a nafion-coated clinoptilolite-modified carbon paste electrode in the presence of ascorbic acid was studied. Both cyclic voltammetry (CV) and differential pulse anodic stripping voltammetry (DPASV) were used for measurements of dopamine. To improve the selectivity of the clinoptilolite-modified carbon paste electrode in presence of a high concentration of ascorbic acid, the electrode surface was coated with nafion membrane. Experimental parameters affecting the determination of dopamine, including the clinoptilolite ratio, nafion membrane thickness, preconcentration time, preconcentration solution pH, stripping solution pH and interferences are discussed. The developed sensor has a wide linear range, a low detection limit, and good stability and reproducibility. The sensor offers a good alternative to existing analytical methods for dopamine, permits a relatively short analysis time, and is simple, selective and inexpensive.
ACCESSION #
18591470

 

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