Abstract
AbstractThe present work describes the development of a highly selective and sensitive voltammetric sensor for dopamine (DA), ascorbic acid (AA) and uric acid (UA) using a basal plane pyrolytic graphite (BPPG) electrode modified with 1,4‐naphthoquinone (NQ) adsorbed on multiwalled carbon nanotubes (MWCNT). The modified electrode showed an excellent electrochemical activity towards the oxidations of DA, AA and UA. Three well‐defined voltammetric peaks, in a buffered solution at pH 7.5, were obtained by differential pulse voltammetry (DPV) at −0.050, 0.145 and 0.270 V vs. Ag/AgCl for AA, DA and UA, respectively. Linear calibration plots were obtained in the range of 10–70 nmol L−1 for DA, 40–280 µmol L−1 for AA and 2–14 µmol L−1 for UA, with detection limits of 3 nmol L−1, 1.9 µmol L−1 and 0.1 µmol L−1, respectively. The sensor was successfully applied in human urine samples and the results showed that the modified electrode has no interferences from urine sample.
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