Varenicline N-óxido (CAS 2306217-12-7) é uma impureza de oxidação relevante no controlo de qualidade de varenicline | formada pela oxidação do nitrogénio terciário resultando em alterações estruturais que podem afetar potência e perfil toxicológico. Caracteriza-se por maior polaridade e massa molecular aumentada | sendo identificada por LC-MS e quantificada por HPLC com detectores UV ou MS | além de confirmação por RMN. A sua presença indica exposição a agentes oxidantes ou condições de armazenamento inadequadas; estratégias de controlo incluem uso de antioxidantes | atmosfera inerte | optimização de pH e validação de processos de síntese e purificação para cumprir limites analíticos e requisitos regulatórios.
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