El Oligómero 2 de ampicilina es una impureza oligomérica resultante de la degradación de la ampicilina por apertura del anillo beta-lactámico y reacciones de condensación bajo condiciones de humedad | calor o pH extremo. Técnicamente se caracteriza como producto de polimerización parcial detectable por HPLC y LC-MS | con perfil cromatográfico y espectrometría específicos que requieren métodos analíticos validados conforme a ICH Q2. Su presencia puede afectar la estabilidad y la potencia del principio activo y por ello se monitorea mediante límites de especificación | estudios de estabilidad acelerada y controles de proceso como optimización de secado | control de pH y materias primas. El perfil de impurezas guía decisiones de aceptación y mitigación.
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