L-CYSTINE (3,3-13C2) is an isotopically labeled disulfide-linked amino acid derivative in which two cysteine residues are connected through a disulfide bond, forming the cystine scaffold with two 13C atoms incorporated at the 3-position of each cysteine unit. The molecule contains an amino group and two carboxyl groups (as appropriate for the cystine structure) while bearing a redox-active disulfide functional group that can participate in thiol-disulfide exchange chemistry under suitable conditions, and the isotopic labeling enables mass-based discrimination from unlabeled cystine. It is used in isotopic tracing, quantitative LC-MS or GC-MS analysis, and peptide or protein labeling workflows where the disulfide-containing cystine motif and the 13C label are required for tracking, method development, or structural studies.
CAT No: L-Iso-0208
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