Electrochemical detection of dopamine using a bare indium-tin oxide electrode and scan rate control

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We report sensitive and selective electrochemical detection of dopamine (DA), a neurotransmitter that plays an important role in organisms. The detection of DA is often prevented by the presence of interfering molecules. Therefore, developing a selective and sensitive technology for detection of DA is necessary. The proposed method simply achieves selective and sensitive detection of DA by scan rate control on bare indium-tin oxide (ITO) electrodes. In the case of a low scan rate (50 mV s(-1)), the anodic peaks of DA and ascorbic acid (AA) appeared at similar potentials (ca. 0.1 V) and both of them showed high anodic peaks. On the other hand, with a high scan rate (5 V s(-1)), the anodic peak of AA almost disappeared, but the DA peak was still high because of the adsorption of DA to the electrode. The detection limit of this method is 1 nM of DA in the presence of 0.1 mM of AA and 100 nM of DA in human blood serum.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2013-11
Language
English
Article Type
Article
Keywords

GLASSY-CARBON ELECTRODE; ASCORBIC-ACID; URIC-ACID; SELECTIVE DETECTION; SURFACE; NEUROTRANSMITTERS; NANOTUBES; COMPOSITE; COATINGS; SENSOR

Citation

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, v.708, pp.7 - 12

ISSN
1572-6657
DOI
10.1016/jjelechem.2013.09.001
URI
http://hdl.handle.net/10203/188612
Appears in Collection
CH-Journal Papers(저널논문)
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