Selective extraction and determination of fluoroquinolones in bovine milk samples with montmorillonite magnetic molecularly imprinted polymers and capillary electrophoresis

Abstract

A sensitive and selective method for separating fluoroquinolones (FQs) from bovine milk samples was successfully developed using montmorillonite magnetic molecularly imprinted polymers (MMMIPs) as adsorbents. MMMIPs were prepared using montmorillonite as carrier, fleroxacin (FLE) as template molecule, and Fe₃O₄ magnetite as magnetic component. MMMIPs possessed high adsorption capacity of 46.3 mg g⁻¹ for FLE. A rapid and convenient magnetic solid-phase extraction procedure coupled with capillary electrophoresis was established with MMMIPs as adsorbents for simultaneous and selective extraction of four FQs in bovine milk samples. Limits of detection ranged between 12.9 and 18.8 μg L⁻¹, and the RSDs were between 1.8 % and 8.6 %. The proposed method was successfully applied to spike bovine milk samples with recoveries of 92.7 %–108.6 %.

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