Abstract
A liquid chromatographic tandem mass spectrometric (LC–MS–MS) method for the determination of five chemical coccidiostats (decoquinate, diclazuril, halofuginone, nicarbazin, and robenidine) and five ionophore coccidiostats (maduramicin, monensin, narasin, salinomycin, and semduramicin) in yoghurt, kefir, and sour cream is presented. Lasalocid, the sixth ionophore listed in 124/2009/EC was not included because of its extremely dissimilar behavior during sample preparation. Main steps of the method include extraction with acetonitrile, centrifugation, clean-up on Oasis HLB solid phase extraction cartridge, evaporation under nitrogen stream, and LC–MS–MS determination. Selectivity, linearity, sensitivity, accuracy, repeatability, within-laboratory reproducibility, limit of determination, and limit of quantitation were determined during the validation procedure. The method proved to be applicable for both qualitative and quantitative determination of the ten above-mentioned target compounds. In our in-house fermentation experiments, milk fortified with coccidiostats was fermented to get yoghurt, kefir, and sour cream. Our results show that the coccidiostat content did not change significantly during fermentation for any of the target compounds.
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Acknowledgments
This work was supported by Wessling International Research and Educational Center. We also wish to express our special thank for Kromat Ltd. for providing the LC–MS–MS instrument. We gratefully acknowledge Janssen for kindly donating diclazuril-bis and Merck Ltd. for providing the chemicals.
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Nász, S., Károlyné, E.M., Rikker, T. et al. Determination of Coccidiostats in Milk Products by LC–MS and Its Application to a Fermentation Experiment. Chromatographia 75, 645–653 (2012). https://doi.org/10.1007/s10337-012-2236-2
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DOI: https://doi.org/10.1007/s10337-012-2236-2