D-Alanyl-L-Glutamine (CAS 205252-36-4) es una impureza peptídica que puede aparecer por racemización parcial o incorporaciones erróneas durante la síntesis. Su presencia afecta el perfil de pureza y exige controles analíticos y de calidad específicos; se detecta y cuantifica habitualmente por HPLC en fase reversa complementado con espectrometría de masas y confirmación por RMN cuando procede. Exhibe buena solubilidad en agua | sensibilidad a condiciones ácidas y básicas y puede aumentar tras almacenamiento a temperaturas elevadas. Los límites de aceptación deben definirse por evaluación de riesgo y validación analítica para garantizar conformidad regulatoria. Procedimientos de síntesis optimizados y condiciones de conservación minimizan su formación.
Referencias
Yagasaki, Makoto, and Shin Hashimoto. “Synthesis and Application of Dipeptides; Current Status and Perspectives.â€Â Applied Microbiology and Biotechnology, vol. 81, no. 1, Nov. 2008, pp. 13–22,  https://doi.org/10.1007/s00253-008-1590-3.
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