A procedure is described for the qualitative identification of the four ionophores monensin, narasin, salinomycin and lasalocid in pre-mixes and feeds at levels from 3 to 100 mg kg–1. These ionophores are extracted with 90% methanol, separated by thin-layer chromatography and detected either by spraying with vanillin reagent or, for low levels, by bioautography.
P. J. Owles, Analyst, 1984, 109, 1331 DOI: 10.1039/AN9840901331
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