Abstract
Monolayers of 2-mercapto-5-methylbenzimidazole (MMB) were prepared on a polycrystalline gold electrode via a self-assembly process to produce a self-assembled monolayer. The resulting electrode was investigated by cyclic voltammetry and electrochemical impedance spectroscopy, and applied to the determination of chloramphenicol (CAP) in a pharmaceutical formulation using flow injection analysis along with amperometric detection. The amperometric cell was operated at −0.75 V (vs Ag/AgCl) at a flow rate of 3 mL min−1. The method was applied to the determination of CAP in ophthalmic solutions, and its performance was compared to a previously validated HPLC method. The response to CAP is linear in the range from 0.050 to 1.000 µmol L−1 (r = 0.9990), and the limit of detection is 44 µmol L−1.
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The authors gratefully acknowledge the financial support from FAPESP and thank Professor C.H. Collins for language assistance.
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Codognoto, L., Winter, E., Doretto, K.M. et al. Electroanalytical performance of self-assembled monolayer gold electrode for chloramphenicol determination. Microchim Acta 169, 345–351 (2010). https://doi.org/10.1007/s00604-010-0339-8
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DOI: https://doi.org/10.1007/s00604-010-0339-8