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Voltammetric Determination of L-Dopa on Poly(3,4-ethylenedioxythiophene)-Single-Walled Carbon Nanotube Composite Modified Microelectrodes
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. (oorganisk kemi)
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. (oorganisk kemi)
2010 (English)In: Electroanalysis, ISSN 1040-0397, E-ISSN 1521-4109, Vol. 22, no 4, 449-454 p.Article in journal (Refereed) Published
Abstract [en]

In the present communication, it is shown that platinum microelectrodes electrochemically coated with a composite of poly(3,4-)ethylenedioxythiophene and single-walled carbon nanotubes (PEDOT/SWNT) enable determinations of 3,4-dihydroxy-l-phenylalaines (L-dopa) in neutral phosphate buffer solutions containing an excess of ascorbic acid. The interpenetrated networked nanostructure of the composite was characterized by scanning electron microscope (SEM) and Raman spectroscopy. It is shown that the presence of the composite gives rise to an increase in the electroactive area of an order of magnitude in compared to the area for the bare microelectrodes. The composite film- coated microelectrode, which yielded reversible cyclic voltammograms for the ferro/ferricyanide redox couple for scan rates between 0.01 and 0.10 V s 1, also gave rise to two well-resolved oxidation peaks for l-dopa and ascorbic acid (AA). The latter effect, which was not seen in the absence of the composite, enabled differential pulse voltammetric determinations of l-dopa in the concentration range between 0.1 to 20 μM with a detection limit of 100 μM.

Place, publisher, year, edition, pages
Wiley InterScience , 2010. Vol. 22, no 4, 449-454 p.
Keyword [en]
L-Dopa, Ascorbic acid, Microelectrode, Single-walled carbon nanotube, PEDOT, Voltammetry, Nanocomposites, Nanotubes
National Category
Chemical Sciences
Research subject
Chemistry with specialization in Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-120274DOI: 10.1002/elan.200900340ISI: 000275039600013OAI: oai:DiVA.org:uu-120274DiVA: diva2:303024
Available from: 2010-03-10 Created: 2010-03-10 Last updated: 2010-12-22Bibliographically approved

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Nyholm, Leif

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