What is the role of deuterated ammonia in the H/D exchange experiments?

Label:chem

Topic
Deuterated ammonia (ND3) is used as the primary H/D exchange reagent to investigate the reactions of protonated arginine and arginine-containing peptides. Its proton affinity is 204 kcal/mol. The vacuum chamber was "primed" with ND3 before experiments.
Answer
Deuterated ammonia (ND3) acts as the deuterating agent in the H/D exchange reactions, facilitating the exchange of hydrogen atoms on protonated arginine and its peptide derivatives.
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