L-CITRULLINE UNLABELED is a free, naturally occurring amino acid with a ureido-containing side chain, classifying it as a polar, non-proteinogenic? (No—citrulline is proteinogenic) proteinogenic amino acid derivative in the sense of being a standard amino acid, bearing an α-amino group and an α-carboxyl group along with a carbamoyl (ureido) functional group on its side chain. The molecule is presented as the L stereoisomer, and its side-chain ureido group provides hydrogen-bonding and polar interaction capabilities while the amino and carboxyl groups can exist as zwitterionic species depending on pH. L-CITRULLINE UNLABELED is used in peptide-related chemical synthesis contexts as a building block for incorporating the ureido side chain into peptide structures and in analytical or biochemical studies where an unlabeled citrulline reference is required for method development or comparative measurements.
CAT No: L-Iso-0173
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