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Issue 3, 2001
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Electrochemical determination of dopamine using a poly(2-picolinicacid) modified glassy carbon electrode

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Abstract

A poly(2-picolinic acid) chemically modified electrode (CME) for the determination of dopamine (DA) by cyclic voltammetry is described. Compared with a bare glassy carbon electrode, the CME exhibits a 200 mV shift of the oxidation potential of DA in the cathodic direction and a marked enhancement of the current response. In pH 7.0 buffer solution, a linear calibration graph is obtained over the range from 2.5 ×10−7 to 1.0 × 10−5 mol dm−3 with a correlation coefficient of 0.998. The detection limit is 3.0 × 10−8 mol dm−3. The modified electrode eliminated efficiently the interference from ascorbic acid (AA) when present in a 150-fold concentration ratio. It also showed excellent stability and reproducibility.

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Publication details

The article was received on 13 Oct 2000, accepted on 11 Jan 2001 and first published on 20 Feb 2001


Article type: Paper
DOI: 10.1039/B008283J
Citation: Analyst, 2001,126, 358-360
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    Electrochemical determination of dopamine using a poly(2-picolinic acid) modified glassy carbon electrode

    H. Zhao, Y. Zhang and Z. Yuan, Analyst, 2001, 126, 358
    DOI: 10.1039/B008283J

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