Modifications of carbon paste electrodes (CPE) with polymelamine (PM) and gold nanoparticles (AuNPs) as dopamine (DA) sensors have been investigated. Electrodes were made by coating PM by electropolymerization from melamine solution on the surface of CPE, then AuNPs were made by electrochemically reducing HAuCl4 solution. AuNPs/PM/CPE electrodes were used as dopamine sensors by using cyclic voltammetry (CV) and pulse differential voltammetry (DPV) techniques. The results showed that the electrodes gave a linearity of 0.2–11 µM, a detection limit of 0.067 µM, and recovery value of 98.78 %± 0.34% in the analysis of urine samples spiked with dopamine. The electrodes gave perfect peak potential for separation from DA, uric acid (UA) and ascorbic acid (AA).
- Gold nanoparticles
- Modified electrode