Bacitracin EP Impurity E (CAS 22601-63-4) is a defined bacitracin-associated peptide impurity with molecular formula C66H98N16O17S and molecular weight 1419.67 g/mol. It represents a structurally close higher-mass analog of the bacitracin cyclic peptide complex, consistent with product-related heterogeneity arising during fermentation, processing, or limited proteolytic transformation. Because of its polar, multifunctional peptide architecture, characterization typically relies on reversed-phase LC coupled to high-resolution MS or LC-MS/MS, often with orthogonal UV and, when needed, ion-exchange profiling. Its monograph significance lies in monitoring process-derived impurities and compositional drift within bacitracin materials.
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