D-His(14)-Teriparatida é uma impureza variante de sequência do fragmento 1-34 do hormônio paratireoideo humano, definida pela substituição do resíduo nativo de L-histidina na posição 14 pelo enantiômero D. Essa inversão estereoquímica pode surgir durante a síntese peptídica por racemização ou epimerização sob condições de ativação e desproteção. Como impureza peptídica, e não como produto de degradação de baixa massa molecular, sua caracterização usualmente requer LC-MS de massa intacta, LC-MS/MS e mapeamento peptídico ortogonal, com separação cromatográfica quiral ou de alta resolução para atribuição inequívoca. Como fórmula molecular e massa molecular não foram informadas, a identidade depende da interpretação espectral resolvida por sequência e do comportamento de retenção.
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