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Updated: Aug 15, 2026

Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
Published on: November 21, 2013
Photolysis (193 nm) of aliphatic dipeptides in aqueous solution
1Max-Planck-Institut für Strahlenchemie, Mülheim an der Ruhr, Germany.
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).
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