Title: Determination of Ionophore Coccidiostats in Feeding Stuffs by Liquid Chromatography-Tandem Mass Spectrometry - Part II. Application to Cross-Contamination Levels and Non-Targeted Feed
Authors: VINCENT UrsulaEZERSKIS ZigmasCHEDIN MostafaVON HOLST Christoph
Publication Year: 2011
JRC N°: JRC58534
ISSN: 0731-7085
URI: www.elsevier.com/locate/jpba
DOI: 10.1016/j.jpba.2010.09.038
Type: Articles in periodicals and books
Abstract: A fit to purpose multi-analyte method for the official control of six coccidiostats (monensin sodium, salinomycin sodium, narasin, lasalocid sodium, semduramicin sodium and maduramicin ammonium alpha) at cross-contamination concentration levels in poultry, cattle, pig and calf compound feed by liquid chromatography tandem mass spectrometry (LC-MS/MS) has been developed and in-house validated. The corresponding maximum levels have been recently introduced by European legislation. The method developed involved a simple extraction of the coccidiostats from the feed samples followed by centrifugation and filtration of the supernatants for all matrices. For calf feed an additional de-fattening step of the filtrated supernatants with n-hexane was necessary. The resulting supernatants were submitted to chromatographic analysis. The analytes were quantified by a modified approach of the standard additions technique applied to the extracts, hence allowing a workload comparable to matrix-matched standard calibration curves. A further simplification of this technique was reached by applying the same addition levels of the target analytes for different concentration ranging from 0.5× maximum level up to 2.5× maximum level (universal approach). The concentration independent intermediate precision expressed in terms of relative standard deviation varied between 3 and 12% (except for maduramicin ammonium alpha and semduramicin sodium up to 21%) and the recovery rates ranged from 80 to 111%, depending on the target analyte and matrix. The limits of detection (LOD) and limits of quantification (LOQ) were different for the various analyte/matrix/instrument combinations but all LOQs were in the 0.01¿0.65mgkg-1 range, hence well below the target concentrations of each analyte. Based on the obtained method performance characteristics the method is considered fit for the intended purpose.
JRC Directorate:Health, Consumers and Reference Materials

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