L-ARGININE:HCL (<5% D) (4,4,5,5-D4) is a hydrochloride salt of the amino acid L-arginine bearing four deuterium atoms at the 4,4,5,5 positions of its guanidino-bearing side chain, classifying it as a stable isotopically labeled, proteinogenic amino acid derivative. The molecule contains a free α-amino group and a carboxyl group associated with chloride as the counterion, while the side chain terminates in a guanidinium functionality that is strongly basic and can form salt and hydrogen-bonding interactions in solution. As an isotopically labeled arginine analogue, it is used for isotopic tracing, quantitative LC-MS or NMR analysis of arginine-containing peptides and proteins, and for preparing chemically defined peptide or amino acid derivatives where the labeled guanidino side chain provides a distinguishable mass signature.
CAT No: L-Iso-0081
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