Production of Deuterium-Labeled β-Alanyl- L -histidine by Isotope Exchange

The efficiency of isotope exchange was compared when gaseous deuterium (solvent-free, solid-phase exchange) and deuterium water were employed as a deuterium source. It was established that exchange with deuterium water is preferable for producing labeled β-alanyl-L-histidine. When using the solid-phase method, the main part of the label is in histidine. The distribution of deuterium during isotope exchange with D 2 O is more uniform. In addition, the use of deuterium water makes it possible to reduce the amount of unlabeled isotopomer to 0.4% and receive a preparation with a yield of 40% (20 mg) and an average content of 3.6 deuterium atoms per carnosine molecule. It can be assumed that the high yield and greater incorporation of deuterium are associated with the pretreatment of the reaction mixture with gaseous deuterium.