Bacitracin EP Impurity O, 즉 Bacitracin J1은 bacitracin A/B/C 복합체와 관련된 상위 동족체의 고리형 dodecapeptide 불순물로, 일반적으로 Bacillus licheniformis 유래 생성물의 발효 기원 미세이질성 및 생합성 후 가공에서 기원한다. 분자식은 C65H101N17O16S, 분자량은 1408.7 g/mol이며, bacitracin 계열의 특징인 thiazoline 함유 펩타이드 골격을 유지한다. 구조 규명과 극미량 정량에는 인접한 등질량 유사체와 서열 변이체가 존재하므로 통상적인 UV 방법보다 고분해능 LC-MS, LC-MS/MS 및 peptide mapping이 요구된다. 이는 nitrosamine이 아니며 ICH M7 범주의 DNA 반응성 불순물도 아니다.
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