L-CYSTEINE (3-13C) contains the proteinogenic amino acid cysteine framework with a thiol-bearing side chain and a free amino group and carboxyl group, where three carbon atoms in the molecule are isotopically labeled with 13C. The molecule retains the stereochemical form indicated by the "L-" designation and presents the characteristic β-thiol functionality that can exist in thiol/disulfide-related redox states, while remaining an unprotected amino acid for direct incorporation into derivative syntheses. Labeled L-cysteine is used in isotopic tracing, quantitative mass spectrometry or NMR analysis, and preparation of labeled peptide or protein fragments where the 13C enrichment enables tracking of cysteine-derived carbon skeletons.
CAT No: L-Iso-0187
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