L-CYSTINE (15N2) is an isotopically labeled, naturally occurring disulfide-linked amino acid derivative in which two cysteine residues are joined through a disulfide bond, forming the cystine scaffold. The molecule contains two amino groups and two carboxyl groups associated with the cystine framework, while the side chains present a disulfide (-S-S-) functionality; the "15N2" designation indicates that two nitrogen atoms are enriched with 15N, without changing the overall connectivity. In research and analytical workflows, the labeled cystine form is used as a stable-isotope tracer or reference for studying nitrogen-containing species in peptide and protein contexts, supporting mass spectrometry-based quantification, isotopic labeling experiments, and the preparation of more complex cystine-containing amino acid and peptide derivatives.
CAT No: L-Iso-0206
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