D-Trp(23)-Teriparatida es una impureza peptídica variante de secuencia de teriparatida, en la que el residuo terminal de L-triptófano se sustituye por el enantiómero D, generando un análogo estereoisomérico y no un producto de truncación. Estas impurezas epiméricas pueden originarse por racemización durante la síntesis en fase sólida, en etapas de desprotección o bajo condiciones de almacenamiento estresante. Dado que no se especifican la fórmula molecular ni el peso molecular, la asignación estructural depende de caracterización ortogonal. La determinación sensible suele requerir LC-MS/MS con separación quiral o de alta resolución, apoyada por mapeo peptídico y, cuando es necesario, movilidad iónica o RMN para confirmar la inversión configuracional.
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