Abstract
We report on an electrode for the amperometric determination of lorazepam. A glassy carbon electrode was coated with a molecular imprint made by electropolymerization of ortho-phenylenediamine and filled with multiwalled carbon nanotubes and gold nanoparticles, which enhances the transmission of electrons. The sensor was studied with respect to its response to hexacyanoferrate (III) as a probe and by electrochemical impedance spectroscopy, cyclic voltammetry and square wave voltammetry. The linear response range to Lorazepam is from 0.5 nM to 1.0 nM and from 1.0 nM to 10.0 nM, with a detection limit of 0.2 nM (at an S/N of 3). The electrode was successfully applied to determine Lorazepam in spiked human serum.
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We wish to express our gratitude to the research Affairs Division and Research Council of Isfahan University of Technology (IUT) and Center of Excellency in Sensor and Green Chemistry for financial support of this work.
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Rezaei, B., Rahmanian, O. & Ensafi, A.A. Sensing Lorazepam with a glassy carbon electrode coated with an electropolymerized-imprinted polymer modified with multiwalled carbon nanotubes and gold nanoparticles. Microchim Acta 180, 33–39 (2013). https://doi.org/10.1007/s00604-012-0897-z
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DOI: https://doi.org/10.1007/s00604-012-0897-z