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Abstract
AbstractThe Raman spectra of L‐histidine, L‐histidine‐ 13C (labelled at C2 of the imidazole ring) and related compounds, namely, imidazole, 4‐methylimidazole, N‐acetyl‐L‐histidine methylamide, were observed in H2O and D2O solutions at various pH and pD values. A strong Raman band at around 1410 cm−1 was found for these compounds in acidic D2O solutions, and it was assigned to a mode characteristic of the N‐deuterated imidazolium ring (Im+) in which the N1C2N3 symmetric stretching and ND bending vibrations are mixed. It is concluded that this band would be useful as a probe for studying the ionization states of histidine residues in proteins.
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