Norfloxacin Impurity 16 (Trifluoroacetate) é uma impureza derivada da formação do sal trifluoroacetato durante etapas de síntese e purificação de norfloxacino. Caracteriza-se por presença do contraíon trifluoroacetato | perfil cromatográfico distinto em HPLC e sinal característico em LC-MS e 19F NMR | complicando a quantificação do princípio ativo. Sua remoção exige estratégias de controle como troca iônica | lavagem com soluções tamponadas | evaporação azeotrópica de TFA e otimização do pH de trabalho. A estabilidade e a interação com excipientes podem afetar o perfil de degradação do lote | por isso sua determinação e limites analíticos devem seguir diretrizes ICH para garantir conformidade e qualidade do produto final.
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