L-METHIONINE (13C5; 15N) is an isotopically labeled, naturally occurring proteinogenic amino acid in which the methionine side chain and backbone carbon and nitrogen atoms are enriched with 13C and 15N. The molecule contains a free amino group and a free carboxyl group, and its thioether-containing side chain (-CH2-CH2-S-CH3) bears the sulfur functionality characteristic of methionine, with stereochemistry corresponding to the L-amino acid form indicated by the name. As an isotopologue suitable for isotopic tracing and mass spectrometry-based analytical method development, it is used as a labeled substrate or standard in studies that monitor incorporation, turnover, or quantitative detection of methionine-containing species in biochemical and chemical analysis workflows.
CAT No: L-Iso-0432
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