Method for isolating polyether antibiotics
 A method is provided for recovering a polyether antibiotic, such as lonomycin, monensin or ionomycin from a fermentation broth, wherein the polyether is first extracted with a water-immiscible solvent, such as ethyl acetate, and the resulting extracts concentrated, dissolved in aqueous methanol and then extracted into hexane, benzene or mixtures thereof. The polyether is thereby recovered in crystalline form directly from the latter extract. 
E. R. Squibb & Sons, Inc.
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Gail L. Wen-Chih William E.
Astle Liu Brown