Voltammetric Determination of l-Dopa on Poly(3,4-ethylenedioxythiophene)-Single-Walled Carbon Nanotube Composite Modified Microelectrodes
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
View Archive Info| Field | Value | |
| Title |
Voltammetric Determination of l-Dopa on Poly(3,4-ethylenedioxythiophene)-Single-Walled Carbon Nanotube
Composite Modified Microelectrodes
|
|
| Creator |
Mathiyarasu, J.
Nyholm, L. |
|
| Subject |
Electrodics and Electrocatalysis
|
|
| Description |
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 filmcoated
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 mM with a detection limit of
100 nM.
|
|
| Publisher |
WILEY-VCH Verlag GmbH & Co.
|
|
| Date |
2010
|
|
| Type |
Article
PeerReviewed |
|
| Format |
application/pdf
|
|
| Identifier |
http://cecri.csircentral.net/222/1/2010-035.pdf
Mathiyarasu, J. and Nyholm, L. (2010) Voltammetric Determination of l-Dopa on Poly(3,4-ethylenedioxythiophene)-Single-Walled Carbon Nanotube Composite Modified Microelectrodes. Electroanalysis, 22 (4). 449 -454. ISSN 1040-0397 |
|
| Relation |
http://cecri.csircentral.net/222/
|
|