title: Photolysis of N-methyl and N-acetyl substituted amino acids.
abstract: Experiments on the production of free radicals in aqueous solutions of N-methyl and N-acetyl substituted amino acids by UV light are reported. The ESR spectra observed at 77 K show that the bond of the CH3- group of these substances is ruptured to a great deal compared with other bond ruptures producing paramagnetic centres. But in N-methyl substituted amino acids the methyl radical is less predominant than in N-acetyl substituted ones. At temperatures higher than 200 K the ESR spectra of all substances studied in our experiments are similar. It is supposed that a radical is formed with an unpaired spin near an oxygen atom.
mesh_terms: D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals; D010782:Photolysis; D014633:Valine / Q000031:analogs & derivatives*
chemical_list: D005609:Free Radicals; D014633:Valine