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An efficient method was developed for simultaneous determination of 13 quinolonesnamely, enoaxacin (ENO), marbofloxacin (MAR), ciprofloxacin (CIP), norfloxacin (NOR), ofloxacin (OFL), pefloxacin methanesulfonate (PEF), danofloxacin (DAN), enrofloxacin (ENR), lomefloxacin (LOM), difloxacin (DIF), sarafloxacin (SAR), oxolinic acid (OXO), and flumequine (FLU)in eggs by column liquid chromatography/electrospray ionization-tandem mass spectrometry. Samples were extracted with a phosphoric acidphosphate buffer followed by purification with a solid-phase extraction cartridge. Recoveries for the 13 quinolones were 6793 with intraday and interday coefficients of variation ranging from 4 to 9 and 2 to 18, respectively. The limit of determination was 0.05 g/kg for OXO and FLU; 0.1 g/kg for MAR, OFL, CIP, LOM, DAN, SAR, DIF, NOR, and ENR; and 0.2 g/kg for ENO and PEF. The method was also applied to study the depletion of PEF in eggs. The concentration of PEF increased and reached a maximum value on the third day, and then decreased rapidly until it could not be detected on day 32; its metabolite NOR was detectable on the second day, and then reached a maximum on the sixth day, after which it could not be detected until day 15.

journal of aoac international

Simultaneous Determination of 13 Quinolones in Eggs Using Column High-Performance Liquid Chromatography/Electrospray Ionization-Tandem Mass Spectrometry and Depletion of Pefloxacin Methanesulfonate in Eggs