Diclofenac Impurity 23 (CAS 131023-44-4) | identificado también como ácido 8-cloro-9H-carbazol-1-acético | es una impureza estructural derivada del anillo carbazol que requiere vigilancia en el perfil de calidad de diclofenaco; se caracteriza por su núcleo aromático halogenado y grupo acético que afectan polaridad y absorción UV. Su presencia puede originarse durante síntesis o degradación y se detecta y cuantifica mediante HPLC-UV y LC-MS | confirmándose con RMN y espectrometría de alta resolución. El control de esta impureza en niveles de trazas es esencial para estudios de estabilidad | validación analítica y cumplimiento regulatorio en ingredientes farmacéuticos activos.
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