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Simultaneous determination of chloramphenicol and florfenicol in liquid milk, milk powder and bovine muscle by LC–MS/MS

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A validated method based on European and Brazilian legislation is reported. It is applicable to the simultaneous determination of chloramphenicol (CAP) and florfenicol (FF) by LC-MS/MS in liquid milk, milk powder and bovine muscle. The chromatographic analysis is completed in 6 min and the extraction procedure is very simple, involving only one step liquid-extraction with ethyl acetate. Where it proved necessary to include clean-up, an efficient and rapid step using C18-dispersive solid was added. Initially, a complete validation was performed with liquid milk matrix; later the scope was extended to the other matrices through extending the inter-day precision (within laboratory reproducibility) RSD values. An internal standard (d5-CAP) was employed for quantitative purposes. The method was shown to have good accuracy and precision for determining CAP residues at the level of 0.3–0.6 µg kg−1 and FF residues at the level of 5–15 µg kg−1.
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Keywords: LC-MS/MS; MSPD; chloramphenicol; florfenicol; residues; validation; veterinary drugs

Document Type: Research Article

Affiliations: Laboratory of Residues and Contaminants–LANAGRO-GO,Ministry of Agriculture, Livestock and Food Supply, Goiânia,Goiás, Brazil CEP 74674-025

Publication date: April 1, 2012

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