Bacitracin EP Impurity Q는 Bacitracin J3로도 불리며, 이질적인 고리형 dodecapeptide 항생제 혼합물에서 유래하는 바시트라신 관련 펩타이드 불순물이다. 분자식 C67H103N17O16S, 분자량 1434.70 g/mol로서, 비균일한 생합성 조립과 이후의 분리 또는 분해 과정에서 발생하는 미세 이질성을 반영한다. 모화합물과의 높은 상동성과 복잡한 구조 때문에 정확한 동정 및 정량에는 일반적으로 LC-MS/MS, 고해상도 LC-ESI-MS, 그리고 직교적 펩타이드 매핑이 요구된다. 규제 관점에서는 유전독성 물질이 아니라 공정 유래 및 분해 연관 불순물로 간주된다.
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