La L-glutamina dietilamida, CAS 745738-16-3, es una impureza amídica derivada del esqueleto de glutamina en la que el nitrógeno terminal de la carboxamida está N,N-dietilado. Con fórmula molecular C9H19N3O2 y masa molecular de 201,27 g/mol, constituye un análogo polar y básico cuya presencia puede indicar control incompleto de la amidación, reacciones laterales de alquilaminación o transformaciones inducidas por el proceso. Como derivado no clásico de glutamina y no como nitrosamina, su evaluación regulatoria exige elucidación estructural y valoración toxicológica conforme a los principios de control de impurezas. La determinación traza suele requerir LC-MS/MS, LC-MS de alta resolución y, cuando procede derivatización, GC-MS.
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