title: Photolysis (193 nm) of aliphatic dipeptides in aqueous solution.
abstract: The photodecomposition of four aliphatic dipeptides containing valine and methionine was studied in neutral solution upon excitation at 193nm. The quantum yields of ionization and decomposition in Ar-saturated aqueous solution are phi(e)- = 0.06-0.16 and phi(d) = 0.06-0.16, respectively. Phi(d) is enhanced (0.08-0.28) under N2O, where the hydrated electrons are converted into OH radicals. A comparison of the phi(d) values of dipeptides with those of monomeric amino acids indicates efficient decomposition of the peptide bond (bond scission).
authors.affiliation: Max-Planck-Institut für Strahlenchemie, Mülheim an der Ruhr, Germany.
authors.forename: D N
authors.initials: DN
authors.lastname: Nikogosyan
authors.forename: H
authors.initials: H
authors.lastname: Görner
mesh_terms: D004151:Dipeptides / Q000378:metabolism* / Q000528:radiation effects; D008715:Methionine / Q000378:metabolism / Q000528:radiation effects; D010782:Photolysis; D012996:Solutions; D014633:Valine / Q000378:metabolism / Q000528:radiation effects; D014867:Water / Q000737:chemistry
chemical_list: D004151:Dipeptides; D012996:Solutions; D014867:Water; D008715:Methionine; D014633:Valine