title: Aminium cation radical of glycylglycine and its deprotonation to aminyl radical in aqueous solution.
abstract: The photochemical reaction between glycylglycine and triplet 4-carboxybenzophenone has been investigated using time-resolved chemically induced dynamic nuclear polarization (CIDNP). It is shown that the mechanism of the peptide reaction with triplet excited carboxybenzophenone is electron transfer from the amino group of the peptide, leading to the formation of an aminium cation radical that deprotonates to a neutral aminyl radical. Simulation of the CIDNP kinetics leads to an estimation of the paramagnetic relaxation time for the alpha-protons at the N-terminus at 20 to 40 mus with the best-fit value of 25 mus.
authors.affiliation: International Tomography Center of SB RAS, Institutskaya 3a, Novosibirsk, Russia.
authors.forename: Olga B
authors.initials: OB
authors.lastname: Morozova
authors.forename: Alexandra V
authors.initials: AV
authors.lastname: Yurkovskaya
mesh_terms: D000588:Amines / Q000737:chemistry*; D002412:Cations / Q000737:chemistry; D005609:Free Radicals / Q000737:chemistry; D006033:Glycylglycine / Q000737:chemistry*; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D012996:Solutions
chemical_list: D000588:Amines; D002412:Cations; D005609:Free Radicals; D012996:Solutions; D006033:Glycylglycine