L-CYSTINE (13C6; 15N2) is an isotopically labeled, sulfur-containing amino acid derivative corresponding to the oxidized dimer of cysteine, featuring a disulfide-linked structure that classifies it as a cystine form rather than a free monomeric amino acid. The molecule contains two amino groups and two carboxyl groups associated with the cystine framework, with the side-chain functionality present as a disulfide (-S-S-) bridge and with 13C6 and 15N2 isotopic substitution distributed across the carbon and nitrogen positions indicated by the product name. In biochemical and analytical workflows, this labeled cystine is used as an isotopic tracer or reference material for studies of sulfur-containing amino acid handling, disulfide exchange-related labeling strategies, and mass spectrometry-based quantification of cystine or cysteine redox states in peptide and protein research contexts.
CAT No: L-Iso-0204
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