Impureza 4 | 5-dihydroxy-2-(1-hydroxy-2-(methylamino)ethyl)benzenesulfonic acid é um subproduto polar contendo grupo sulfonato e dihidroxibenzeno que influencia o perfil de pureza e a estabilidade do lote. Devido à elevada polaridade e capacidade de formar sais | exige métodos analíticos sensíveis como HPLC com detecção UV e espectrometria de massas para quantificação e caracterização estrutural | além de RMN para confirmação. A impureza apresenta solubilidade em meios aquosos e comportamento dependente de pH | podendo afetar rendimento e cromatografia preparativa. Recomenda-se monitoramento por limites especificados | estratégias de purificação direcionadas e estudos de forçamento para controle robusto do processo.
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