Norepinephrine Impurity 21 | conocida como Noradrenochrome (CAS 490-89-1) | es una impureza de degradación relevante en formulaciones de norepinefrina. Químicamente derivada por oxidación de la catecolamina | presenta mayor poliaridad y tendencia a formar productos coloreados que afectan perfiles de pureza. Su detección requiere métodos analíticos sensibles | por ejemplo cromatografía líquida de alta resolución acoplada a espectrometría de masas y detección UV | con límites de cuantificación validados según ICH Q3A. El control de proceso incluye condiciones redox estrictas | agentes antioxidantes y monitoreo del tiempo de almacenamiento para minimizar su aparición y garantizar cumplimiento de especificaciones de calidad.
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