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

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

Content Provider	Semantic Scholar
Author	Lavanya, Maderi Madhavi, Gajulapalle
Copyright Year	2015
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.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.e-journals.in/PDF/V4N2/541-551.pdf
Language	English
Access Restriction	Open
Subject Keyword	Amino Acids Ascorbic Acid Carbon Coefficient Cyclic GMP Delegated Path Validation Dopamine Large Oxalic Acid Oxalic Acids Oxalicum acidum, oxalic acid, sorrel acid, Homeopathic preparation Oximetry, Pulse PH (complexity) Paste substance Poly A Refresh rate Salicylic Acid 0.4 MG/MG Medicated Patch Salicylic Acid 20 MG/ML Medicated Liquid Soap Sodium monofluorophosphate 0.0076 MG/MG Toothpaste Thioctic Acid Uric Acid User agent enzyme activity oxidation
Content Type	Text
Resource Type	Article

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