A new sensor for the simultaneous determination of paracetamol and mefenamic acid in a pharmaceutical preparation and biological samples using copper(II) doped zeolite modified carbon paste electrode |
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Authors: | Ali Babaei Balal Khalilzadeh Mohammad Afrasiabi |
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Affiliation: | (1) Electroanalytical Laboratory, Department of Chemistry, Faculty of Science, University of Arak, P.O. Box 38156-879, Arak, Iran |
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Abstract: | A new chemically modified electrode is constructed based on a copper(II) doped zeolite modified carbon paste electrode (Cu2+Y/ZMCPE). It is demonstrated that this novel sensor could be used for the simultaneous determination of the pharmaceutically
important compounds paracetamol (PAR) and mefenamic acid (MEF). The measurements were carried out using the differential pulse
voltammetry (DPV) method. The prepared modified electrode shows voltammetric responses of high sensitivity, selectivity and
stability for PAR and MEF under optimal conditions, which makes it a suitable sensor for simultaneous submicromolar detection
of PAR and MEF in solution. The oxidation peak current for PAR in Briton Robinson buffer (pH = 10) was measured at various
concentrations between 0.25 and 900 μM. (The detection limit was 0.1 μM and S/N was 3.) It proved linear (the correlation
coefficient was 0.9987). For the MEF a linear correlation between oxidation peak current and concentration of MEF over the
range 0.3–100 μM, with a correlation coefficient of 0.9991 and a detection limit of 0.04 μM, was obtained. The analytical
performance of this sensor has been evaluated for the detection of PAR and MEF in human serum, human urine and a pharmaceutical
preparation. |
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