Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/34730
標題: Voltammetric peak separation of dopamine from uric acid in the presence of ascorbic acid at greater than ambient solution temperatures
作者: Zen, J.M.
曾志明
Hsu, C.T.
Hsu, Y.L.
Sue, J.W.
Conte, E.D.
關鍵字: hot-wire electrochemistry
clay-modified electrodes
cyclic voltammetry
reduction
期刊/報告no:: Analytical Chemistry, Volume 76, Issue 14, Page(s) 4251-4255.
摘要: Peak overlap in voltammetry poses challenges for the quantitative analysis of electroactive species. Dopamine and uric acid are typically challenging to determine voltammetrically because of their very similar oxidation peak potentials. We report preliminary results of the use of a screen-printed carbon electrode for the determination of dopamine and uric acid in an electrolyte solution maintained above ambient temperatures. Higher temperatures resulted in dramatic shifting of the dopamine oxidation peak toward lower potentials, while the uric acid peak was essentially stationary. Ascorbic acid, an interference in voltammetric uric acid determinations, is effectively suppressed at higher temperatures. This resulted in a greater peak separation of dopamine from uric acid at higher temperatures, which is desirable for better peak integration. In addition, greater current responses for both species were recorded at higher temperatures. The cause for such an increase in peak current is unraveled using ac impedance measurements. Presented are preliminary results for determining dopamine and uric acid at temperatures higher than ambient. Much improved voltammetric peak separation and sensitivity is obtained at these higher temperatures compared to ambient.
URI: http://hdl.handle.net/11455/34730
ISSN: 0003-2700
文章連結: http://dx.doi.org/10.1021/ac0495135
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