L-CYSTEINE (13C3; 15N) is a stable-isotope-labeled, sulfur-containing proteinogenic amino acid in the cysteine class, featuring a thiol-bearing side chain (-CH2-SH) and the standard amino acid backbone with an amino group and a carboxyl group. The molecule is present as the L stereoisomer as indicated by the name, and the side-chain thiol and the α-amino and α-carboxyl functionalities can participate in acid-base behavior and thiol-related derivatization while the (13C3; 15N) labeling provides isotopic enrichment at the carbon and nitrogen positions for mass spectrometric detection. In biochemical and analytical workflows, this labeled amino acid is used as an isotopic tracer or internal standard for studies that require tracking or quantifying cysteine-containing species, including peptide and protein sample analysis, amino acid profiling, and method development for LC-MS-based assays.
CAT No: L-Iso-0180
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