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  • Chem Sci Trans., 2015, 4(2),  pp 541-551  

    DOI:10.7598/cst2015.1012

    Research Article

    Resolution of Dopamine in the Presence of Ascorbic Acid and Uric Acid by the Poly Oxalic Acid Modified Carbon Paste Electrode

  • P.JEEVAN JYOTI, K.GANGADHARA REDDY, V. PRABHAKER RAO, M. LAVANYA and G.MADHAVI*
  • Department of Chemistry, S.V.U. College of Sciences, Sri Venkateswara University, Tirupati-517502, Andhra Pradesh, India
  • Abstract

    A novel poly oxalic acid carbon paste electrode was fabricated by electro polymerization process and characterized in this study. This poly oxalic acid modified carbon paste electrode by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) exhibited an excellent electro catalytic activity towards the resolution of ascorbic acid (AA), dopamine (DA) and uric acid (UA) compared with bare carbon paste electrode. The effect of pH range from 5.5 to 8.0 was studied and the redox peak was pH dependent with a slope of 60 mV/pH and from the regression coefficient of the effect of scan rate shows that the process is adsorption controlled. The DPV study of 6.2 to 131 μM concentration range of DA shows 6 μM detection limit. The oxidation potentials of AA, DA and UA at the poly oxalic acid modified carbon paste electrode was shifted slightly negatively and the peak currents were much larger than the bare carbon paste electrode. DPV was used for the simultaneous determination of AA, DA and UA in their mixture, and the peak potential separations between AA and DA, DA and UA, AA and UA were197 mV, 169 mV and 367 mV respectively. The limit of detection for AA, DA and UA were 0.93 mM, 7.4 μM and13 μM respectively. This Oxalic acid modified carbon paste electrode showed many merits in stability, sensitivity, facility, economy and also applicable for real sample analysis

    Keywords

    Oxalic acid, Ascorbic acid, Uric acid, Dopamine, Cyclic Voltammetry, Differential pulse voltammetry

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