Fabrication of Poly(Aspartic Acid)-Nanogold Modified Electrode and Its Application for Simultaneous Determination of Dopamine, Ascorbic Acid, and Uric Acid — Oak Academic Publishing
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Fabrication of Poly(Aspartic Acid)-Nanogold Modified Electrode and Its Application for Simultaneous Determination of Dopamine, Ascorbic Acid, and Uric Acid
School of Chemistry and Chemical Engineering, Shandong University, Jinan, China
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School of Chemistry and Chemical Engineering, Shandong University, Jinan, China
1 School of Chemistry and Chemical Engineering, Shandong University, Jinan, China
2 School of Chemistry and Chemical Engineering, Shandong University, Jinan, China
A nanostructured polymer film incorporated gold nanoparticles modified electrode was fabricated. The fabrication process involved a previous electropolymerization of aspartic acid and followed by the eletrodeposition of gold nano-particles on the glassy carbon electrode. The resulting poly (aspartic acid)-nanogold modified electrode (PAA- nano-Au/GCE) was characterized by scanning electron microscopy (SEM) and electrochemical impedance spectros-copy (EIS). A higher catalytic activity was obtained to electrocatalytic oxidation of dopamine (DA), ascorbic acid (AA) and uric acid (UA) due to the enhanced peak current and well-defined peak separations compared with three, bare GCE, PAA/GCE and nano-Au/GCE. Simultaneous determination of DA, AA, and UA were studied by voltammetry. The linear range of 5.0 × 10 -7 - 1.0 × 10 -4 M for DA, 5.0 × 10 -6 - 2.0 × 10 -3 M for AA and 5.0 × 10 -6 - 1.0 × 10 -3 M for UA was obtained. The detection limit was calculated for DA, AA and UA as being 6.5 × 10 -8 M, 5.6 × 10 -7 M and 3.0 × 10 -7 M, respectively (S/N = 3). The practical application of the present modified electrode was demonstrated by the determination of DA, AA and UA in calf serum and fetal calf serum samples.
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