O-fitalaldeído (CAS 643-79-8) como impureza apresenta características químicas e analíticas críticas para controle de qualidade. Este dialdeído aromático é altamente reativo e propenso à hidrólise | polimerização e formação de oligômeros | especialmente em presença de umidade | luz ou impurezas ácidas. Traços podem causar coloração | instabilidade e reações de reticulação em matrizes sensíveis | além de interferir em quantificações analíticas. Identificação e quantificação são realizadas por HPLC | GC-MS e RMN | com métodos validados para detectar níveis traço. Procedimentos de armazenamento sob atmosfera inerte e secagem rigorosa minimizam sua formação e garantem conformidade com especificações.
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