Ionic liquid-based microwave-assisted liquid-liquid microextraction and high performance liquid chromatography determination of sulfonamides from animal oils

Abstract

The authors performed ionic liquid-based microwave-assisted liquid-liquid microextraction(IL-based MALLME) coupled with high performance liquid chromatographic separation for the determination of 6 sulfonamides (SAs) from animal oils. The target analytes were extracted from animal oil samples with sodium hydroxide solution containing 1-butyl-3-methylimidazolium tetrafluoroborateand as the extraction solvent under microwave irradiation. The experimental parameters of the IL-based MALLME, including types of ILs, volume of IL, amount of ion-pairing agent(NH₄PF₆), pH value of sample solution, and extraction temperature and time were evaluated. The limits of detection and quantification obtained were in a range of 0.4–0.5 μg/kg and a range of 1.2–1.8 μg/kg, respectively. The accuracy of the method was evaluated by analyzing five spiked animal oil samples at two fortified levels(5 and 50 μg/kg), and the recoveries of SAs varied from 81.4% to 114.5% with relative standard deviations ranging from 0.8% to 9.0%.

Keywords

Ionic liquid-based microwave-assisted liquid-liquid microextraction(IL-based MALLME) / High performance liquid chromatography(HPLC) / Sulfonamide / Animal oil

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