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Validation of a method for the analysis of nine quinolones in eggs by pressurized liquid extraction and liquid chromatography with fluorescence detection

Authors
Journal
Talanta
0039-9140
Publisher
Elsevier
Publication Date
Volume
85
Issue
1
Identifiers
DOI: 10.1016/j.talanta.2011.04.021
Keywords
  • Eggs
  • Quinolones
  • Pressurized Liquid Extraction
  • Liquid Chromatography
  • Kinetex Column
  • Fluorescence Detection
Disciplines
  • Medicine

Abstract

Abstract A multiresidue method for the analysis, in egg matrices, of residues of nine quinolones used in veterinary medicine, has been developed and validated according to the provisions of Council Decision 2002/657. Compounds were extracted by a pressurized liquid extraction (PLE) technique using a 1:1 mixture of acetonitrile and a phosphoric acid buffer (pH 3.0) at 70°C. The obtained extract was clear enough, so that no further clean-up was necessary. Analytes were determined by liquid chromatography (LC) with fluorescence detection (FL). Two chromatographic columns were compared: a high-purity silica Inertsil C8 column and a newly developed Kinetex C18 core–shell technology column. Validation was carried out at four concentration levels, using both chromatographic columns. Precision in terms of reproducibility standard deviation was between 7% and 23%, and good recoveries were obtained. Decision limit (CCα) and detection capability (CCβ) values obtained with the Inertsil and Kinetex columns were in the 0.2–19.8μgkg−1 and 0.4–33.5μgkg−1 concentration ranges, respectively. The proposed method allows residues of quinolones banned for use with laying hens to be detected and quantified in eggs. About twenty-four samples per day can be processed.

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