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A correction was published on 8 January 2009, see Sensors 2009, 9(1), 376.

Sensors 2008, 8(11), 6924-6935; doi:10.3390/s8116924
Article

Determination of Dopamine in the Presence of Ascorbic Acid by Nafion and Single-Walled Carbon Nanotube Film Modified on Carbon Fiber Microelectrode

 and *
Received: 2 June 2008; in revised form: 23 October 2008 / Accepted: 30 October 2008 / Published: 4 November 2008
(This article belongs to the Section Physical Sensors)
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Abstract: Carbon fiber microelectrode (CFME) modified by Nafion and single-walled carbon nanotubes (SWNTs) was studied by voltammetric methods in phosphate buffer saline (PBS) solution at pH 7.4. The Nafion-SWNTs/CFME modified microelectrode exhibited strongly enhanced voltammetric sensitivity and selectivity towards dopamine (DA) determination in the presence of ascorbic acid (AA). Nafion-SWNTs film accelerated the electron transfer reaction of DA, but Nafion film as a negatively charged polymer restrained the electrochemical response of AA. Voltammetric techniques separated the anodic peaks of DA and AA, and the interference from AA was effectively excluded from DA determination. Linear calibration plots were obtained in the DA concentration range of 10 nM - 10 μM and the detection limit of the anodic current was determined to be 5 nM at a signal-to-noise ratio of 3. The study results demonstrate that DA can be determined without any interference from AA at the modified microelectrode, thereby increasing the sensitivity, selectivity, and reproducibility and stability.
Keywords: Single-walled carbon nanotubes; Nafion; Carbon fiber microelectrode; Dopamine; Ascorbic acid; Electrocatalytic oxidation Single-walled carbon nanotubes; Nafion; Carbon fiber microelectrode; Dopamine; Ascorbic acid; Electrocatalytic oxidation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Jeong, H.; Jeon, S. Determination of Dopamine in the Presence of Ascorbic Acid by Nafion and Single-Walled Carbon Nanotube Film Modified on Carbon Fiber Microelectrode. Sensors 2008, 8, 6924-6935.

AMA Style

Jeong H, Jeon S. Determination of Dopamine in the Presence of Ascorbic Acid by Nafion and Single-Walled Carbon Nanotube Film Modified on Carbon Fiber Microelectrode. Sensors. 2008; 8(11):6924-6935.

Chicago/Turabian Style

Jeong, Haesang; Jeon, Seungwon. 2008. "Determination of Dopamine in the Presence of Ascorbic Acid by Nafion and Single-Walled Carbon Nanotube Film Modified on Carbon Fiber Microelectrode." Sensors 8, no. 11: 6924-6935.



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