ArticleJournal of veterinary research2025
A novel method for the determination of isoxazoline derivatives in plasma by ultra-high performance liquid chromatography-tandem mass spectrometry: validation and applicability to screening tests.
Article in Journal of veterinary research, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Introduction: Isoxazoline derivatives such as fluralaner, sarolaner, lotilaner, and afoxolaner are a new class of insecticide and acaricide compounds. These compounds are characterised by rapid action and high efficacy over a period of up to several weeks. A method for identifying all four isoxazoline derivatives in animal and human plasma has not been proposed to date. Therefore, the aim of this study was to develop and validate a novel analytical method for the determination of fluralaner, sarolaner, lotilaner, and afoxolaner in laying hen plasma and to revalidate the proposed method in human, canine and feline plasma. Material and Methods: The plasma concentrations of isoxazoline derivatives were determined by ultra-high performance liquid chromatography-tandem mass spectrometry. Analytical samples were prepared by precipitating proteins with a mixture of 96% acetonitrile and 4% ammonium hydroxide (v/v). Chromatographic separation was achieved on a chromatographic column (1.8 μm 2.1 × 100 mm) using 0.1% formic acid in water and 0.1% formic acid in acetonitrile with gradient elution. Results: The results indicate that the described method is replicable, linear (r Conclusion: The proposed method is simple, effective, inexpensive and rapid because it requires only a single-step sample preparation protocol.
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