DL-CYSTEINE (1-13C) is a stable-isotope-labeled amino acid in which the cysteine side chain contains a 13C label at the specified position, with the molecule retaining the standard amino acid backbone featuring an amino group and a carboxyl group. The thiol-bearing side chain provides a reactive sulfhydryl functionality that can participate in disulfide formation or thiol-electrophile chemistry, while the "DL" designation indicates a racemic mixture of stereoisomers at the amino acid stereocenter. As an isotopically labeled cysteine analogue, it is used in isotopic tracing, mass spectrometry-based amino acid and peptide analysis, and labeling workflows that require incorporation of the 13C-containing carbon into cysteine-derived intermediates or peptide fragments.
CAT No: L-Iso-0174
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