Journal
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
Volume 67, Issue 7, Pages 1201-1212Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jccs.201900330
Keywords
carbon paste electrode; dopamine; electrocatalytic oxidation; morphine; oxadiazole derivative
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In this paper, we report the fabrication of an amplified sensor to determine dopamine in the presence of morphine based on nano-MgO, multiwall carbon nanotubes, and an oxadiazole derivative. The electrochemical behavior and electrocatalyic activity of the sensor toward the oxidation of dopamine were investigated. Cyclic voltammetry was used to study the redox features of the sensor, and the results have shown that dopamine overpotential oxidation at the surface of the sensor was reduced to nearly 460 mV. The diffusion coefficient was estimated by chronoamperometry. Three segmented linear dynamic ranges over the range 0.05-5175.0 and detection limit of 0.021 mu M for the quantification of dopamine were obtained using differential pulse voltammetry (DPV). The modified nanocomposite carbon paste electrode, which showed excellent sensitivity, selectivity, repeatability, and reproducibility, was satisfactorily employed to determine dopamine and morphine in actual samples.
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