Bacitracin EP Impurity G, 즉 Bacitracin H2는 CAS 144572-54-3에 해당하는 bacitracin 폴리펩타이드 복합체의 정의된 펩타이드 관련 불순물로, 단순한 공정 오염물이라기보다 산화 또는 가수분해 변형체로 해석된다. 분자식 C65H96N16O17S, 분자량 1405.6 g/mol이며, bacitracin 계열에 특징적인 고리형 리포펩타이드 골격과 황 함유 잔기 배열을 유지한다. 동정과 정량에는 고분해능 LC-MS, LC-MS/MS 및 직교적 펩타이드 매핑이 통상 요구되며, 유사 동족체와의 크로마토그래피적 동시 용출이 흔하다. 규제적 관점에서는 유전독성보다 구조 규명과 불순물 프로파일링이 중심이다.
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