Phloroglucinol EP Impurity O (CAS 137-19-9) | também conhecido como 4 | 6-diclororesorcinol | é uma impureza halogenada tipicamente formada como subproduto em etapas de cloração ou degradação do processo sintético. Apresenta maior lipofilicidade e padrão isotópico de cloro que facilita identificação por espectrometria de massas | enquanto sua polaridade afeta tempo de retenção em HPLC e GC. Para controle analítico recomenda-se HPLC-UV/LC-MS para quantificação e RMN para confirmação estrutural. A presença desta impureza implica estabelecimento de limites de especificação | avaliação de estabilidade do princípio ativo e implementação de medidas de mitigação durante síntese | purificação e armazenamento.
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