DL-METHIONINE (3,3,4,4-D4; METHYL-D3) is a deuterium- and methyl-labeled methionine amino acid presented as the DL (racemic) stereochemical mixture, featuring the typical amino acid backbone with a thioether-containing side chain. The molecule bears an α-amino group and a carboxyl group, and the side chain includes a thioether methyl group whose hydrogen atoms are replaced by deuterium (METHYL-D3) along with additional deuterium labeling at the 3,3,4,4 positions (3,3,4,4-D4), providing an isotopically enriched sulfur-containing functionality for mass-based detection. It is used as an isotopically labeled methionine substrate or reference in peptide and amino acid analysis, isotopic tracing, and method development where the labeled side chain supports quantitative LC-MS or related analytical workflows.
CAT No: L-Iso-0438
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