Polymyxin B2 Sulfate and its Impurities

Polymyxin B2 Sulfate, are antibiotics. Polymyxins B and E (also known as colistin) are used in the treatment of Gram-negative bacterial infections. Reference standards of Polymyxin B2 Sulfate API, and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.