DL-LYSINE:2HCL (4,4,5,5-D4,) is a deuterium-labeled, free amino acid belonging to the lysine class, featuring a straight-chain aliphatic side chain terminating in a primary ε-amino group and a backbone bearing an amino group and a carboxyl group. The molecule is supplied as a dihydrochloride salt, and its isotopic composition includes deuterium substitution at the 4 and 5 positions of the lysine side chain (4,4,5,5-D4), which can be used to distinguish it in mass-based analyses while retaining the overall functional-group pattern of lysine. As an isotopically labeled internal standard or tracer precursor, this labeled lysine salt is employed in isotopic tracing, quantitative LC-MS method development, and peptide or amide synthesis where incorporation of a deuterium-tagged lysine residue is required for structure-activity studies or analytical differentiation.
CAT No: L-Iso-0402
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