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An analytical method has been developed for the simultaneous determination of the following endectocide drugs in milk: ivermectin, abamectin, doramectin, moxidectin, eprinomectin, emamectin and nemadectin. Samples were extracted with acetonitrile, purified with solid-phase extraction on a reversed phase C(8), derivatised with N-methylimidazole, trifluoroacetic anhydride and acetic acid to a stable fluorescent derivative, and were further analysed by gradient high performance liquid chromatography (HPLC) on an endcapped reversed phase Supelcosil LC-8-DB. The derivatisation step was mathematically optimised and the method was validated according to the requirements of Commission Decision 2002/657/EC, using fortified raw bovine milk. Mean recovery was between 78 and 98%. The repeatability (CV(r)) and within-laboratory reproducibility (CV(W)) ranged from 4.6 to 13.4% and from 6.6 to 14.5%, respectively. Decision limits (CCalpha) for analytes with MRL values, namely eprinomectin and moxidectin, were determined to be 24.8 and 50.6 microg kg(-1), respectively. CCalpha values for unauthorised endectocides ranged from 0.1 to 0.2 microg kg(-1). Due to high acceptability regarding the required criteria and applicability to ovine and caprine milk, giving similar results, this multi-analyte method has been successfully implemented in pharmacokinetic research studies as well as statutory residue monitoring in Slovenia.
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| http://dx.doi.org/10.1016/j.aca.2010.01.040 | DOI Listing |
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