期刊
TALANTA
卷 63, 期 2, 页码 443-449出版社
ELSEVIER
DOI: 10.1016/j.talanta.2003.11.024
关键词
carbon nanotubes; carbon paste; homocysteine; electrochemistry; thiols
The use of a carbon-nanotube paste (CNTP) electrode provides an effective means for the determination of homocysteine. A decrease of ca. 120 mV in the overpotential for the oxidation of homocysteine compared to a traditional carbon paste electrode, is reported along with greatly enhanced signal-to-noise characteristics. The analytical parameters have been assessed with a linear range from 5 to 200 muM and a detection limit of 4.6 muM. Furthermore, the generic nature of this increased reactivity of the CNTP surface towards thiol moieties has been demonstrated with cysteine, glutathione and n-acetylcysteine, providing a greatly enhanced electrochemical response compared to the carbon paste electrode. (C) 2003 Elsevier B.V. All rights reserved.
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