How does the H/D exchange behavior of glycine differ from arginine?

Label:chem

Topic
Studies showed that the carboxylic acid group of glycine [M+H]+ ions undergoes H/D exchange three to 10 times faster than the N-terminal amino group when reacted with CH3OD. Protonation of glycine oligomers (Glyn) typically occurs at the N-terminus.
Answer
For glycine, the carboxylic acid group demonstrates a significantly faster H/D exchange rate than the N-terminal amino group when exposed to CH3OD. Protonation in glycine oligomers generally occurs at the N-terminus.
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