Free Radical Formation in Amino Acids Exposed to Thermal Hydrogen Atoms

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Abstract
The purpose of the Investigation was to compare radicals formed in amino acids (L form) by hydrogen atom exposure with that from gamma irradiation. Free radicals are formed in all the naturally occurring amino acids upon their exposure to thermal hydrogen atoms. For most amino acids the ESR [electron spin resonance] spectra of radicals formed by this method show the same basic structure as the spectra from samples exposed to gamma rays. One notable exception is leucine, for which hydrogen atom exposure produces only one of the radicals produced in this compound by gamma rays. Approximate dihedral angles which the methylene protons make with the carbon orbital in which the unpaired electron is located have been calculated. An anomalous effect of oxygen for radicals produced by hydrogen atom exposure Indicates that the absence ol an oxygen eflect for some gamma-irradiated compounds may be due to limited diffusion of molecular oxygen into the crystal lattice.

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