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Contact SupplierColistin sulfate, white or near-white powder, odorless, bitter and hygroscopic, soluble in water, slightly soluble in methanol, ethanol, almost insoluble in acetone, ether, etc., free base slightly soluble in water. Stable in the range of PH3-7.5. Colistin sulfate is produced by polymyxa, and has strong antibacterial activity against Gram-negative bacteria, and is used for treating intestinal diseases caused by Gram-negative bacteria. It is better combined with the sulfadiazine effect.