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Selective detection of dopamine using a functionalised polyaniline composite electrode

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Abstract

The behaviour of a poly (aniline boronic acid) (PABA) modified glassy carbon electrode (GCE) for the detection of dopamine (DA) in the presence of excess of ascorbic acid (AA) using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques is investigated. On bare GCE, both DA and AA are oxidized at ~0.16 V, whereas on PABA modified GCE they are oxidized at 0.2 and 0.054 V, respectively. Though PABA favours DA oxidation through ester formation with boronic acid motif, the AA oxidation is also promoted by polyaniline backbone through the involvement of AA in the redox of polyaniline. Since both DA and AA undergo oxidation at closely spaced potentials at a PABA electrode, Nafion®-incorporation into the PABA film was examined for selective determination of DA in the presence of AA. The selectivity was due to accumulation of DA on the electrode surface through ester formation with the boronic acid group and suppression of AA oxidative current through charge discrimination by Nafion.

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Authors and Affiliations

  1. Electrodics and Electrocatalysis Division, Central Electrochemical Research Institute, Karaikudi, 630 006, India

    J. Mathiyarasu, S. Senthilkumar, K. L. N. Phani & V. Yegnaraman

Authors
  1. J. Mathiyarasu
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  2. S. Senthilkumar
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  3. K. L. N. Phani
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  4. V. Yegnaraman
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Correspondence to J. Mathiyarasu.

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Mathiyarasu, J., Senthilkumar, S., Phani, K.L.N. et al. Selective detection of dopamine using a functionalised polyaniline composite electrode. J Appl Electrochem 35, 513–519 (2005). https://doi.org/10.1007/s10800-005-0914-6

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  • DOI: https://doi.org/10.1007/s10800-005-0914-6

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