DL-LYSINE:2HCL (2-13C; EPSILON-15N) is a doubly protonated amino acid salt in which lysine bears isotopic labels at the C-2 position and at the epsilon nitrogen of the side chain, corresponding to a labeled, non-proteinogenic isotopologue of lysine used for tracing and analytical studies. The molecule contains a free alpha-amino group and carboxyl group as well as a terminal epsilon-amino group on the (unprotected) side chain, with the side-chain nitrogen labeled as 15N and the alpha carbon labeled as 13C, while the "DL" designation indicates a racemic mixture of stereoisomers. As a stable isotopically enriched lysine salt, it is used as a substrate or reference material in isotopic labeling workflows, including peptide and protein derivatization strategies, mass spectrometry method development, and quantitative studies that track lysine-containing fragments or incorporate labeled residues into larger biomolecular structures.
CAT No: L-Iso-0399
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