La propionil-D-alanina, CAS 1309000-24-5, es el aminoácido D N-acilado derivado de la condensación del ácido propiónico con D-alanina. Con fórmula C6H11NO3 y peso molecular de 145.16 g/mol, constituye una impureza amídica quiral de baja masa que puede formarse por transferencia de acilo, acoplamiento incompleto o contaminación estereoquímica durante la síntesis de péptidos o aminoácidos. No es una nitrosamina, pero pertenece al grupo de impurezas sintéticas relacionadas con el proceso. Su caracterización suele requerir LC-MS/MS, HPLC quiral y RMN, con fragmentación por MS que respalda el enlace amida y la configuración D.
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