L-CYSTEINE (1-13C; 15N) contains the amino acid cysteine framework with a thiol-bearing side chain, featuring both an amino group and a carboxyl group suitable for peptide-related chemistry. The molecule is isotopically labeled with 13C at the specified carbon position and 15N at the nitrogen, while retaining the L-stereochemical designation indicated by the product name and presenting the side-chain sulfhydryl functionality that can form thioether or disulfide-containing derivatives under appropriate conditions. As an isotopically labeled amino acid, it is used in isotopic tracing, mass spectrometry-based analytical method development, and the preparation of labeled peptide or protein fragments for studies that require discrimination of cysteine-derived atoms during synthesis or detection.
CAT No: L-Iso-0177
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