Dienogest-D5 é uma impureza isotópica associada ao dienogest | caracterizada pela substituição de cinco átomos de hidrogênio por deutério | resultando em aumento de massa aproximado de 5 u. Originada em etapas de síntese ou por trocas isotópicas | apresenta comportamento analítico distinto sendo prontamente detectada por LC-MS através do deslocamento de massa e por espectroscopia de RMN pela atenuação de sinais de protões nas posições deuteradas. A presença pode afetar quantificações por HPLC se não separada adequadamente | por isso exige métodos validados de controle de qualidade | especificações de limite e monitoramento de estabilidade ao longo do armazenamento.
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