Phenylephrine Impurity 9, também descrita como aduto citrato de fenilefrina, é um produto de associação estequiométrica e não uma classe discreta de degradação. Com fórmula molecular C15H19NO8 e massa molecular de 341.31 g/mol, reflete a formação de sal ou complexo entre fenilefrina e citrato sob condições ácidas de processo ou armazenamento. Sua presença pode indicar interação de formulação, comportamento de cristalização ou arraste de meios contendo citrato. A caracterização normalmente requer LC-MS/MS ortogonal e LC-MS de alta resolução, com confirmação por RMN quando isolada. No perfil de impurezas, o comportamento cromatográfico deve ser diferenciado de espécies relacionadas à fenilefrina e de artefatos de contraíon.
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