Simultaneous Determination of Six Quinolone Antibiotics in Poultry and Porcine Samples by Capillary Electrophoresis

A capillary electrophoresis (CE) method for the simultaneous determination of residues of six quinolones (enrofloxacin, ciprofloxacin, ofloxacin, lomefloxacin, norfloxacin, cinoxacin) in chicken, hen, and swine tissue samples were developed and validated. The sample preparation consisted of a solid phase extraction on C-18 cartridges prior to the analysis by CE with UV detection. The method was validated in terms of selectivity, linearity, precision, accuracy, recovery, and stability. The calibration curves were linear to at least 10–1 000 ng/g for all quinolones with r > 0.999. The values of decision limits (CCα) and detection capabilities (CCβ) for the analysed substances were between 3.2-16.9 and 3.5-20.3 ng/g, respectively. The CE method was robust and specific, allowing reliable quantification of quinolone residues in animal tissues and should also be useful for clinical and biomedical investigations.