A impureza H da Farmacopeia Europeia do ácido valpróico, identificada como valeronitrila (CAS 110-59-8), é um nitrilo alifático de baixa massa molecular associado ao perfil de impurezas de origem sintética e degradativa de substâncias relacionadas ao valproato. Com fórmula molecular C5H9N e massa molar de 83,1 g/mol, trata-se de uma impureza volátil e estruturalmente simples, derivada de precursores, em vez de um produto de degradação complexo oriundo do farmacóforo. Sua presença é geralmente avaliada no contexto de arraste de processo, formação por reações secundárias ou vias de transformação hidrolítica e oxidativa. Devido à volatilidade e à baixa polaridade, GC-MS em headspace, GC-FID e LC-MS/MS confirmatória são frequentemente necessários para identificação e quantificação em nível de traço.
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