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Determination of fluoroquinolone residues in poultry muscle in Portugal

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Abstract

A total of 98 poultry samples, including chicken and turkey muscle, were analysed, using a sensitive and reliable analytical method based on liquid chromatography (LC) with spectrofluorimetric detection, for simultaneous determination of four fluoroquinolone (FQ) antibiotics, namely enrofloxacin (ENRO), ciprofloxacin (CIPRO), norfloxacin (NOR), and sarafloxacin (SARA). The method involved extraction with 0.15 mol L−1 HCl and clean-up by solid-phase extraction using Oasis HLB cartridges. Chromatographic separation was carried out on a C18 TSK gel column, in isocratic mode, with 0.025 mol L−1 H3PO4 solution, adjusted to pH 3.0 with tetrabutylammonium hydroxide-methanol (78:22) as mobile phase. Good linearity over the investigated concentration range was observed, with mean values of correlation coefficients higher than 0.9989 for all the analytes studied. The limits of quantification (LOQ), expressed as the lowest fortification level with acceptable precision were 15 μg kg−1 for ENRO, CIPRO, and NOR, and 30 μg kg−1 for SARA; these values are in compliance with requirements for monitoring of maximum residues levels (MRLs). Overall recoveries from spiked samples ranged from 80% to 92% with relative standard deviations (RSD) lower than 6.1%. Of the chicken and turkey samples analysed, 44.2% and 37.8%, respectively, were contaminated. The levels found in the analysed poultry samples, collected from markets of Oporto and Coimbra, located in the north and central zones of Portugal, respectively, were lower than 114.2 and 87.6 μg kg−1 in chicken and turkey muscle samples, respectively. One positive chicken sample was contaminated with ENRO at levels higher than the MRL.

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Acknowledgments

The authors gratefully thank FCT/POCI (FEDER) for financial support of this study.

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Authors and Affiliations

  1. Group of Health Surveillance, CEF, Faculty of Pharmacy, University of Coimbra, Health Sciences Campus, Azinhaga de Santa Comba, 3000-548, Coimbra, Portugal

    A. Pena, L. J. G. Silva, A. Pereira & C. M. Lino

  2. Faculty of Pharmacy, University of Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal

    L. Meisel

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  1. A. Pena
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  2. L. J. G. Silva
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  3. A. Pereira
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  4. L. Meisel
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  5. C. M. Lino
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Correspondence to A. Pena.

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Pena, A., Silva, L.J.G., Pereira, A. et al. Determination of fluoroquinolone residues in poultry muscle in Portugal. Anal Bioanal Chem 397, 2615–2621 (2010). https://doi.org/10.1007/s00216-010-3819-0

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  • DOI: https://doi.org/10.1007/s00216-010-3819-0

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