Photolysis (193 nm) of aliphatic dipeptides in aqueous solution.
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).
Nikogosyan
D N
DN
Max-Planck-Institut für Strahlenchemie, Mülheim an der Ruhr, Germany.
Görner
H
H
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
D004151:Dipeptides; D012996:Solutions; D014867:Water; D008715:Methionine; D014633:Valine