A propionil-D-alanina, CAS 1309000-24-5, é o aminoácido D N-acilado resultante da condensação do ácido propiônico com D-alanina. Com fórmula C6H11NO3 e massa molecular de 145.16 g/mol, trata-se de uma impureza amídica quiral de baixa massa, que pode surgir por transferência de acila, acoplamento incompleto ou contaminação estereoquímica durante a síntese de peptídeos ou aminoácidos. Não é uma nitrosamina, mas enquadra-se como impureza sintética relacionada ao processo. A elucidação normalmente exige LC-MS/MS, HPLC quiral e RMN, com fragmentação por MS apoiando a ligação amida e a configuração D.
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