L-CYSTINE (13C6; D6; 15N2) is an isotopically labeled, disulfide-linked dimer of the cysteine amino acid class, in which two cysteine residues are connected through a cystine disulfide bond. The molecule contains two amino functional groups and two carboxyl functional groups and bears a side-chain disulfide (-S-S-) that links the two halves, with the isotopic labels (13C6, D6, 15N2) distributed across the carbon, hydrogen, and nitrogen atoms as indicated by the product name. As a labeled amino acid derivative for chemical biology and analytical method development, it is used for isotopic tracing and mass spectrometric or NMR-based studies of disulfide-containing peptides, protein oxidation states, and related redox-dependent structural analyses.
CAT No: L-Iso-0203
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