Ongera Gilbert

Poly (Naphthol Green B) film based sensor for resolution of dopamine in the presence of uric acid: A voltammetric study

A polymer film of Naphthol Green B was prepared on the surface of a graphite pencil electrode using cyclic voltammetry. This poly(Naphthol Green B) coated electrode exhibits an excellent electroanalytical activity towards the determination of dopamine and uric acid. The voltammogram obtained for dopamine at the modified electrode was reversible. The effect of concentration and also pH were investigated. The peak current and peak potential were recorded in a 0.2 M phosphate buffer solution of pH 7.0. The modified electrode shows the ability to detect the dopamine and uric acid separately. The interference study was done using differential pulse voltammetry. The modified electrode was also used for the detection of dopamine in injections.

Voltammetric Detection of Dopamine in Presence of Ascorbic Acid and Uric Acid at Poly (Xylenol Orange) Film-Coated Graphite Pencil Electrode

Poly (xylenol orange) film-coated graphite pencil electrode was fabricated for the detection of dopamine in the presence of ascorbic acid and uric acid in phosphate buffer solution of pH 7. The redox peaks obtained at modified electrode shows a good enhancement. The scan rate effect was found to be a diffusion-controlled electrode process. The electrochemical oxidation of dopamine was depended on pH, and the limit of detection was found to be 9.1 10−8 M. The simultaneous study gave and excellent result with great potential difference between dopamine and other bioactive organic molecules by using both cyclic voltammetric and differential pulse voltammetric techniques. The present modified graphite electrode was applied to the detection of dopamine in the injection samples, and the recovery obtained was satisfactory.