Abstract
In this work, an analytical method for simultaneous analysis of several quinolones (cinoxacin, oxolinic acid, nalidixic acid, and flumequine) and fluoroquinolones (norfloxacin, enrofloxacin, enoxacin, ciprofloxacin, and danofloxacin) in baby-food samples is described for the first time. The method is based on isolation of these analytes by ultrasound-assisted extraction procedure followed by a solid-phase extraction sample clean-up step and final determination of the analytes by HPLC using UV detection. For the extraction step, 2 g baby food was mixed with methanol in a centrifuge tube and one single extraction cycle of 15 min at room temperature was carried out. After centrifugation, supernatant was collected and two different solid-phase extraction procedures were developed and evaluated for sample clean-up. The first was based on use of strong anion-exchange cartridges whereas the second was based on use of a ciprofloxacin-imprinted polymer. Both sample clean-up procedures had their own advantages and drawbacks, and the analytical performance and applicability of each procedure was established and properly discussed. The anion-exchange resin-based method enabled simultaneous determination of quinolones and fluoroquinolones, reaching limits of detection ranging from 0.03 to 0.11 μg g−1. In contrast, the use of a ciprofloxacin-imprinted polymer did provide selectivity towards fluoroquinolones, leading to chromatograms free from co-extractives reaching limits of detection one order of magnitude lower than those obtained by the first approach.
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Authors wish to thank Spanish Ministry of Education and Science (AGL2005–00905) for financial support.
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Díaz-Alvarez, M., Turiel, E. & Martín-Esteban, A. Selective sample preparation for the analysis of (fluoro)quinolones in baby food: molecularly imprinted polymers versus anion-exchange resins. Anal Bioanal Chem 393, 899–905 (2009). https://doi.org/10.1007/s00216-008-2300-9
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DOI: https://doi.org/10.1007/s00216-008-2300-9