[Simultaneous determination of monepantel and its metabolite residues in cow and sheep milk by solid phase extraction-high performance liquid chromatography-tandem mass spectrometry].

A method for the rapid and simultaneous determination of monepantel and its metabolite residues in cow and sheep milk has been developed using high performance liquid chromatography-tandem mass spectrometry. The samples were extracted with acetonitrile to precipitate the proteins and passed through a neutral alumina solid phase extraction (SPE) cartridge. The extracts were separated on an Inertsil C8-3 column (150 mm×4.