Phenylephrine 4 | 6-DMTQ Impurity (Peak-1) (HCl salt) | CAS 57196-61-9 | é uma impureza identificada como pico 1 em perfis cromatográficos de phenylephrine. Na forma salina HCl apresenta maior solubilidade aquosa e comportamento ácido que influencia retenção em HPLC e detecção por LC-MS. É tipicamente caracterizada por espectroscopia 1H NMR | HRMS e análise de impurezas por UPLC com limites de especificação estabelecidos para garantir conformidade farmacopêutica. A presença desta impureza aponta para etapas de síntese com reação secundária ou desproteção incompleta. Controle por otimização de reação | purificação direcional e monitoramento in-process minimiza seu impacto na qualidade e estabilidade do princípio ativo.
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