Tri-beta-Alanine HCl, CAS 78089-27-7, is the hydrochloride salt of a polybasic amino acid derivative with formula C9H17N3O4·HCl and molecular weight 231.25 + 36.46 g/mol. Structurally, it represents a trifunctional amino acid analogue rather than a volatile or chromophoric impurity, and it may arise from synthetic coupling steps or incomplete deprotection in peptide or amino acid manufacturing. Its multiple ionizable centers produce strong polarity, poor chromatographic retention, and pronounced pH-dependent speciation. Quantification typically relies on LC-MS/MS with hydrophilic interaction chromatography or ion-pair LC, while orthogonal confirmation may require high-resolution MS and derivatized HPLC-UV.
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