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A modified electrode was fabricated by electrochemically deposition of Pt nanoparticles on the multiwall carbon nanotube covered glassy carbon electrode (Pt nanoparticles decorated MWCNT/GCE). A higher catalytic activity was obtained to electrocatalytic oxidation of ascorbic acid, dopamine, and uric acid due to the enhanced peak current and well-defined peak separations compared with both, bare and MWCNT/GCE. The electrode surfaces were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and electrochemical impedance spectroscopy (EIS). Individual and simultaneous determination of AA, DA, and UA were studied by differential pulse voltammetry. The detection limits were individually calculated for ascorbic acid, dopamine, and uric acid as being 1.9 Â 10 À5 M, 2.78 Â 10 À8 M, and 3.2 Â 10 À8 M, respectively. In simultaneous determination, LODs were calculated for AA, DA, and UA, as of 2 Â 10 À5 M, 4.83 Â 10 À8 M, and 3.5 Â 10 À7 M, respectively.

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