Pulse Radiolysis Study of Imidazole and Histidine in Water

Authors: P. S. Rao, M. Simic, E. Hayon The reaction rate constants of e-/sub aq/ and OH radicals with imidazole (ImH), N-methylimidazole (MeIm), histidine, and N-methylhistidine were determined. The k(e-/sub aq/ + S) values were strongly dependent on the state of protonation of the ”pyridine” nitrogen in these molecules, with rates of approximately 5 x 109 M-1 sec-1 at pH…