Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/77358
Title: Voltammetric Determination of Dopamine in a Mixture of Dopamine and Ascorbic Acid at a Deactivated Polythiophene Film Modified Electrode
Authors: Gao, Z. 
Yap, D.
Zhang, Y.
Keywords: Ascorbic acid
Chemically modified electrode
Dopamine
Polythiophene
Voltammetry
Issue Date: 1998
Source: Gao, Z.,Yap, D.,Zhang, Y. (1998). Voltammetric Determination of Dopamine in a Mixture of Dopamine and Ascorbic Acid at a Deactivated Polythiophene Film Modified Electrode. Analytical Sciences 14 (6) : 1059-1063. ScholarBank@NUS Repository.
Abstract: The voltammetric responses of dopamine (DA) and ascorbic acid (AA) at a deactivated polythiophene (PT) film modified electrode were investigated. It was found that DA displays nearly identical voltammetric response at both a bare and the modified electrode, while the voltammetric signal of AA is greatly suppressed at the modified electrode due to the repulsion between it and the deactivated film. Various experimental parameters affecting the voltammetric responses of DA and AA were studied. The modified electrode was demonstrated to be very useful in selectively determining DA in a mixture of DA and AA. At a 0.5 μm deactivated PT film modified electrode the calibration curve of DA was linear over the range of 0.8 μM - 1.0 mM in the presence of 1.0 mM AA. The detection limit was 0.4 μM.
Source Title: Analytical Sciences
URI: http://scholarbank.nus.edu.sg/handle/10635/77358
ISSN: 09106340
Appears in Collections:Staff Publications

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