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    Cyclic and pulse voltammetric study of dopamine at the interface between two immiscible electrolyte solutions

    Access Status
    Fulltext not available
    Authors
    Beni, V.
    Ghita, M.
    Arrigan, Damien
    Date
    2005
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Beni, V. and Ghita, M. and Arrigan, D. 2005. Cyclic and pulse voltammetric study of dopamine at the interface between two immiscible electrolyte solutions. Biosensors and Bioelectronics. 20 (10): pp. 2097-2103.
    Source Title
    Biosensors and Bioelectronics
    DOI
    10.1016/j.bios.2004.08.004
    Additional URLs
    http://www.sciencedirect.com/science/article/pii/S0956566304003690
    ISSN
    0956-5663
    URI
    http://hdl.handle.net/20.500.11937/24132
    Collection
    • Curtin Research Publications
    Abstract

    The detection of dopamine by differential pulse voltammetry (DPV) and square wave voltammetry (SWV) at the interface between two immiscible electrolyte solutions (ITIES) has been studied. Voltammetry at the liquid/liquid (water/1,2-dichloroethane) interface provides a simple method for overcoming the major problem associated with dopamine detection by voltammetry at solid electrodes: the co-existence of ascorbate at higher concentrations. Selectivity for dopamine was achieved by the use of dibenzo-18-crown-6 as an ionophore for the facilitated transfer voltammetry of protonated dopamine across the ITIES. Under these conditions, ascorbate is not transferred and hence does not interfere in the ion transfer current for dopamine. By use of DPV and SWV, the lowest concentration detectable can be lowered from ca. 0.1mM (obtained with cyclic voltammetry) to 2 M. Evaluation of the effect of some other physiologically important species (acetylcholine, sodium, potassium and ammonium ions) on the dopamine transfer voltammetry has been studied, indicating the need for improved ionophore designs in order to achieve practically useful selectivity.

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