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Quantitative HPLC determination and preliminary assessment of dissolved, suspended, and settled oxolinic acid from turbot farm

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Quantification of outputs of antibacterial agents from fish farms is necessary to assess their environmental impact. In effluents, antibacterial agents are dissolved or associated with mineral or organic materials, the heaviest of which quickly settle at the exit of the fish farm. Oxolinic acid (OA) is one of the quinolones the most frequently used in turbot farms. For the first time, procedures are described for determination of dissolved, suspended, and settled forms of OA by reversed-phase high-performance liquid chromatography. Chromatography was performed on a 5 µm C18 cartridge, with a mixture of acetonitrile and aqueous orthophosphoric acid solution as mobile phase, and fluorescence detection. OA was easily and completely isolated by solid–liquid extraction. The method is selective, accurate, and precise; limits of quantitation were 0.005 µg mL-1, 0.025 µg per filter, and 0.025 µg g-1, respectively for dissolved, suspended, and settled forms of OA. These methods enabled initial assessment of the amounts of dissolved, suspended, and settled forms of OA (72, 23, and 2%, respectively) of the antibacterial agent administered.
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Bibliogr. 12 poz., rys., tab.
  • Ecole Nationale Vétérinaire de Nantes, Unité Mixte de Recherche INRA-ENVN 1035, Chimiothérapie Aquacole et Environnement, Atlanpôle – La Chantrerie, B.P. 40706 44307 – Nantes cedex 03, France
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