Diltiazem Impurity 8 (CAS 42399-48-4) es una impureza relacionada del principio activo que requiere identificación y cuantificación precisa durante el control de calidad. Presenta retos analíticos en metodologías HPLC y LC-MS por coelución y baja respuesta de ionización | por lo que se recomienda optimizar condiciones de gradiente y selectividad de fase estacionaria. La caracterización estructural y la determinación del límite de aceptación son críticas para establecer especificaciones de lote y cumplir normativas ICH Q3A/B. Estudios de estabilidad forzados y perfiles de degradación ayudan a definir su formación y límites de exposición. Se suministra para referencia analítica y validación de métodos.
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