3-Cyclo (Asn)-Calcitonin é uma impureza peptídica resultante da ciclização do resíduo Asn na posição 3, gerando um anel succinimida que altera propriedades fisicoquímicas e o perfil cromatográfico. Caracteriza-se por mudança na massa molecular observável por espectrometria de massa de alta resolução e por deslocamento na retenção por HPLC. Sua ocorrência está associada a condições de síntese, purificação e armazenamento que favorecem desaminação e ciclização. Monitoramento por LC-MS/MS, otimização das condições de síntese e controle de pH e temperatura são críticos para quantificação e minimização desta impureza no perfil de qualidade do peptídeo.
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