Abstract
A method for simultaneous determination of flumequine (FLM), oxolinic acid (OXO), sarafloxacin (SAR), danofloxacin (DAN), enrofloxacin (ENR), and ciprofloxacin (CIP) in tilapia (Orechromis niloticus) fillets, using liquid chromatography-tandem mass spectrometry (LC-ESI-MS-MS QToF) is presented. The quinolones were extracted from the food matrix with a solution of 10% trichloroacetic acid-methanol (80:20 v/v) with ultrasonic assistance. Clean-up of the extract solution was performed by using polymeric solid-phase extraction cartridges. The LC separation was carried out on an octadecyl hybrid silica column (C18, 150 mm × 3 mm, 5 μm). The column temperature was set at 30 °C, and gradient elution (0.2 mL min−1) was performed using water and acetonitrile, both containing 0.1% of acetic acid, as mobile phase components. The analytes were ionized using electrospray in the positive polarity mode. The following analytical results were obtained: linearity was about 0.99 for all the quinolones; intra and inter-assay precision (RSD%) were lower than 12.7 and 20%, respectively; and recoveries were from 89 to 112%. The quantitation limits were below the maximum residue limits established for the analytes. The method is suitable for the determination of quinolone residues in fish fillets and the QToF technique made it possible to obtain m/z ratios with less than 10 ppm of error for each analyte.
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Acknowledgements
The authors gratefully acknowledge financial support from CNPq and FAPESP, laboratory technician Marcela Sismotto and Dr Flavia P.S. Airoldi for assistance with analysis, and Professor C.H. Collins and Dr Matthew J. Grossman for language assistance.
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Paschoal, J.A.R., Reyes, F.G.R. & Rath, S. Quantitation and identity confirmation of residues of quinolones in tilapia fillets by LC-ESI-MS-MS QToF. Anal Bioanal Chem 394, 2213–2221 (2009). https://doi.org/10.1007/s00216-009-2900-z
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DOI: https://doi.org/10.1007/s00216-009-2900-z