Abstract
A highly selective method was developed for the simultaneous determination of eight penicillins in catfish using automated on-line solid-phase extraction coupled to liquid chromatography–tandem mass spectrometry (XLC–MS/MS). The type of cartridge, equilibration sample volume, volume of solvent to carry the sample into the cartridge, and elution times were studied in order to optimize the XLC operating conditions. MS/MS conditions were also adjusted for better peak resolution. The present method was validated in agreement with the criteria of Commission Decision 2002/657/EC, showing a linear range from 2 to 350 μg kg−1 and regression coefficient higher than 0.995 for the studied penicillins. Decision limits, calculated in the case of substances with no permitted limit, were lower than 0.6 μg kg−1, and detection capability values were lower than 2.0 μg kg−1. Samples spiked at 2.0, 10.0, and 50.0 μg kg−1 showed high recovery (72–92%) and precision values lower than 20% except for amoxicillin. The present method was also applied for the analysis of penicillins in 30 catfish samples bought in local markets.
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Acknowledgments
The authors thank the Consejería de Educación y Ciencia of the JCCM and the European Social Fund for funding this work with the Exp. 09/09-C; the Ministerio de Educación y Ciencia and FEDER (CE) for the AGL2007-64092/ALI project. Thanks to Kathy Walsh for proofreading the English manuscript.
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Luana Maggi and Jorge Hurtado de Mendoza have contributed equally to this study.
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Maggi, L., Hurtado de Mendoza, J., Zalacain, A. et al. On-line Solid-Phase Extraction Coupled to Liquid Chromatography–Ion Trap Tandem Mass Spectrometry for Determination of Penicillins in Catfish. Food Anal. Methods 5, 1047–1053 (2012). https://doi.org/10.1007/s12161-011-9342-x
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DOI: https://doi.org/10.1007/s12161-011-9342-x