3-Cyclo (Asn)-Calcitonin es una impureza peptídica identificada por ciclización del residuo asparagina durante síntesis o almacenamiento. Presenta un patrón cromatográfico distinto en HPLC y un espectro de masas consistente con pérdida de masa y formación de enlace cíclico intracadena. Su presencia puede afectar perfil de pureza, estabilidad y propiedades farmacocinéticas y potencial inmunogenicidad en lotes de calcitonina. Se recomienda monitorizar mediante HPLC acoplada a MS, análisis de péptidos por fragmentación y ensayos de cuantificación específicos. El control y reducción de esta impureza requiere optimización de condiciones de síntesis, tiempo de reacción y parámetros de purificación para asegurar conformidad analítica.
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