Voltammetric Analysis of Naproxen in Graphite Electrodes and Its Determination in Pharmaceutical Samples

The present work discuses new findings in the electrochemistry of naproxen over graphite electrodes. This new approach, allows the proposal of a simple and competitive low-cost method to carry out naproxen’s voltammetric quantification. Naproxen’s indirect quantification through an adsorption anodic wave was performed at a graphite bar electrode using differential pulse voltammetry. An anodic current maximum was recorded at a potential of −0.3 V referred to a saturated Ag/AgCl reference electrode. The calibration plot having a correlation coefficient of 0.990, sensibility of 4.19±0.62 µA cm3 µg−1, with detection and quantification limits of 0.68 and 3.3 µg cm−3, respectively.