Article ID Journal Published Year Pages File Type
1256018 Chinese Chemical Letters 2009 4 Pages PDF
Abstract

A carbon paste electrode modified with electropolymerized films of isonicotinic acid was developed. The modified electrode shows excellent electrocatalytic activity toward the oxidation of both dopamine (DA) and epinephrine (EP). Separation of the reduction peak potentials for dopamine and epinephrine was about 357 mV in pH 5.3 phosphate buffer solution (PBS) and the character was used for the detection DA and EP simultaneously. The peak currents increase linearly with DA and EP concentration over the range of 8.0 × 10−5 to 7.0 × 10−4 mol/L and 5.0 × 10−6 to 1.0 × 10−4 mol/L with detection limits of 2 × 10−5 and 1 × 10−6 mol/L, respectively. The interference studies showed that the modified electrode exhibits excellent selectivity in the presence of large excess of ascorbic acid (AA).

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Physical Sciences and Engineering Chemistry Chemistry (General)
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