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標題: An ultrasensitive voltammetric method for dopamine and catechol detection using clay-modified electrodes
作者: Zen, J.M.
Chen, P.J.
關鍵字: nontronite;dopamine;catechol;clay-modified electrode;square-wave voltammetry;ascorbic-acid;electrochemical detection;carbon electrodes;glassy-carbon;brain
Project: Electroanalysis
期刊/報告no:: Electroanalysis, Volume 10, Issue 1, Page(s) 12-15.
Electrochemically preanodized nontronite clay-modified electrodes were found to be very sensitive in the detection of dopamine and catechol by square-wave voltammetry. When preanodized in a neutral medium at +1.8 V (vs. Ag/AgCl) for 60 s, the clay-modified electrodes exhibit a marked enhancement of the current response for dopamine and catechol. The sensitivity of dopamine can be further improved at the preanodized clay-modified electrode with the addition of triethylamine. After 20 s preconcentration in phosphate buffer (DI-l 7.4) solution, linear calibration plots are obtained over 0-0.7 mu M and 0.7-15 mu M ranges with a detection limit (3 sigma) of 0.10 nM for catechol, As to dopamine, in the presence of 30 mu M triethylamine, linear calibration plots are obtained over 0-1 mu M and 1-10 mu M ranges and the detection limit is 0.056 nM.
ISSN: 1040-0397
Appears in Collections:化學系所

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