Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 208, Issue -, Pages 78-83Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molliq.2015.04.023
Keywords
1-Methyl-3-butylimidazolium chloride; NiO nanoparticles; Levodopa analysis; Modified electrode
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This paper describes the development of 1-methyl-3-butylimidazolium chloride ionic liquid-NiO nanoparticle modified carbon paste electrode (MBICl/NiO/NPs/CPE) for the voltammetric determination of levodopa (L-DOPA) in real samples. We describe the synthesis and characterization of NiO/NPs with different methods such as transmission electron microscopy (TEM); energy-dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). The electrochemical oxidation of L-DOPA occurred in a pH-dependent 2e(-) and 2H(+) process, and the electrode reaction followed a diffusion-controlled pathway. The oxidation peak potential of LDOPA on the MBICl/NiO/NPs/CPE appeared at 450 my, which was about 90 mV decrease of the overpotential compared to that obtained on the traditional carbon paste electrode (CPE) and the oxidation peak current was increased for about 3.0 times. The electrochemical parameter such as charge transfer coefficient (alpha = 0.73) was calculated. The linear response range and detection limit were found to be 0.7-900 mu mol L-1 and 0.4 mu mol L-1, respectively using the differential pulse voltammetry method (DPV). The results showed that the proposed sensor is highly selective, sensitive with a fast response for L-DOPA analysis. (C) 2015 Elsevier B.V. All rights reserved.
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