Impureza associada ao padrão secundário de benzylpenicilina sódica é tipicamente a forma hidrolisada resultante da abertura do anel beta-lactâmico, gerando peniciloato e outros derivados oxidados; essas impurezas apresentam maior polaridade, deslocamento do pico UV e massas moleculares compatíveis com perda do anel lactâmico. Em controle analítico, exibem retenção reduzida em cromatografia reversa e sinais característicos em LC-MS/MS e espectrometria de massas de alta resolução, facilitando identificação e quantificação. Propriedades físicoquímicas incluem maior solubilidade em meio aquoso e sensibilidade a pH alcalino e temperatura, sendo essenciais para avaliação de estabilidade e pureza do padrão.
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