Electron paramagnetic resonance characterization of gamma irradiation damage centers in powder ofL-(+)-tartaric acid,N-acetyl-L-alanine and 1-methyl-L-histidine

The effect of gamma radiation of amino acid derivatives in the solid state: an EPR study

“…The g value of the species is g = 2.0028 ± 0.0005. The hyperfine constants and g value of the radical discussed here seem to agree well with the literature values of their analogous (27) and amine radicals. (30,31) Glycine is the simplest amino acid, and research shows it to be physiologically active and important to cell metabolism.…”

“…The hyperfine constants and g value of the radical discussed here seem to agree well with the literature values of alanine and its Downloaded by [Colorado College] at 18:05 02 February 2015 derivatives. (25)(26)(27)(28)(29) When the sample was cooled to 130 K, the spectrum of N-methyl-dl-alanine remained unchanged.…”

EPR study of γ-irradiated tetra-N-butylammonium iodide

“…The average values for a C α H 2 , a C β H 2 and g-value are 15.5G, 15.5G and 2.0023, respectively. The EPR parameters obtained from our study are in good agreement with values in the literature for similar radicals (2,(4)(5)(6)(7)(8)(9)(10)(11)(12) and are given in Table 2.…”

“…Therefore, we concluded that there is one radical. According to the chemical structure of the substance and the available data in literature (2,(4)(5)(6)(7)(8)(9)(10)(11)(12), these intensity ratios were attributed to + 60 Co-γ The spectra of intensity ratios indicate that the unpaired electron spin interacts with six hydrogen protons of the tetra-N-butylammonium iodide sample. Therefore, the spectra are attributed to the (C α H 2 C β H 2 C γ H 2 CH 3 ) radical.…”

Stability toward High Energy Radiation of Non-Proteinogenic Amino Acids: Implications for the Origins of Life

“…The radiolysis of amino acids was studied in the past for various reasons ranging from food sterilization [ 48 , 49 ] to radiation dose determination [ 50 ], taking advantage of the fact that amino acids are able to form stable radicals [ 51 , 52 , 53 , 54 , 55 ]. About amino acids radiolysis, there are available also the very important and classical works of Bonner and colleagues [ 21 , 56 , 57 , 58 , 59 , 60 ], which were specifically designed to test the Wester-Ulbricht hypothesis that parity violation in the β-decay may have originated the enantiomeric excess in the biochemical world, and the work of Kminek and Bada [ 61 ].…”