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Electroanalysis and simultaneous determination of dopamine and epinephrine at poly(isonicotinic acid)-modified carbon paste electrode in the presence of ascorbic acid
Authors:Yuan Zhen Zhou Li Juan Zhanga Shuang Li Chena She Ying Donga Xiao Hui Zhengb a School of Science  Xi'an University of Architecture    Technology  Xi'an   China b Research    Engineering Center of Modernization of Chinese Herbal Medicine  Northwest University  Xi'an   China
Affiliation:a School of Science, Xi'an University of Architecture and Technology, Xi'an 710055, China;b Research and Engineering Center of Modernization of Chinese Herbal Medicine, Northwest University, Xi'an 710069, China
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).
Keywords:Dopamine  Epinephrine  Isonicotinic acid  Ascorbie acid  Simultaneous determination
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