Journal
BIOELECTROCHEMISTRY
Volume 89, Issue -, Pages 42-49Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2012.08.008
Keywords
Ofloxacin; Gatifloxacin; L-Cysteine; Simultaneous determination; Differential pulse voltammetry
Funding
- National Natural Science Foundation of China [20975066, 21271127, 61171033]
- Nano-Foundation of Science and Techniques Commission of Shanghai Municipality [11nm0501300]
- Leading Academic Discipline Project of Shanghai Municipal Education Commission [J50102]
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A novel cysteic acid modified carbon paste electrode (cysteic acid/CPE) based on electrochemical oxidation of L-cysteine was developed to simultaneously determine ofloxacin and gatifloxacin in the presence of sodium dodecyl benzene sulfonate (SDBS). Fourier transform infrared spectra (FTIR) indicated that L-cysteine was oxidated to cysteic acid. Electrochemical impedance spectroscopy (EIS) and cyclic voltammograms (CV) indicated that cysteic acid was successfully modified on electrode. The large peak separation (116 mV) between ofloxacin and gatifloxacin was obtained on cysteic acid/CPE while only one oxidation peak was found on bare electrode. And the peak currents increased 5 times compared to bare electrode. Moreover, the current could be further enhanced in the presence of an anionic surfactant, sodium dodecyl benzene sulfonate. The differential pulse voltammograms (DPV) exhibited that the oxidation peak currents were linearly proportional to their concentrations in the range of 0.06-10 mu M for ofloxacin and 0.02-200 mu M for gatifloxacin, and the detection limits of ofloxacin and gatifloxacin were 0.02 mu M and 0.01 mu M (S/N=3), respectively. This proposed method was successfully applied to determine ofloxacin and gatifloxacin in pharmaceutical formulations and human serum samples. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.
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