Spiramicina EP Impurity A (Neospiramycin I | CAS 70253-62-2) é uma impureza relacionada estruturalmente à spiramicina | identificada na Farmacopeia Europeia e de importância para controle de qualidade. Apresenta modificações na macroestrutura lactona que afetam polaridade | solubilidade e absorção UV | gerando deslocamento no tempo de retenção em HPLC e padrões de fragmentação característicos por espectrometria de massa. Métodos analíticos validados como HPLC-UV | LC-MS e RMN são aplicados para quantificação e confirmação estrutural. A monitorização desta impureza durante síntese | purificação e testes de estabilidade é fundamental para avaliar pureza | vias de degradação e conformidade com especificações regulamentares.
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