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RP-HPLC profiles at 214 nm for (a) blank control, (b) colistin (U.S. Pharmacopeia) and the commercially available products of CMS: (c) X-GEN, (d) Paddock, (e) Atlantic and (f) Forest. The concentrations of colistin (b) and CMS (c–f) were 5 mg/mL.
