Prednisolone-21-valerate (CAS 39791-31-6) es una impureza lipofílica derivada de la esterificación del grupo 21 en prednisolona | relevante para control de calidad en procesos farmacéuticos. Su presencia puede originarse por reacciones secundarias durante la síntesis o por degradación en condiciones de almacenamiento. Requiere caracterización estructural mediante LC-MS/MS y RMN y cuantificación robusta por HPLC en fase acuosa-orgánica con estándar de referencia. El monitoreo siguiendo directrices regulatorias y estudios de degradación forzada permiten establecer límites de aceptación y estrategias de purificación para minimizar su impacto en estabilidad y perfil de impurezas. Datos analíticos reproducibles facilitan la evaluación del riesgo y la conformidad del lote.
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