Electron paramagnetic resonance of rγ-irradiated glycyl-L-glutamine monohydrate, iminodiacetic acid and methyliminodiacetic acid

Abstract

The electron paramagnetic resonances of γ-irradiated powders of glycyl-L-glutamine monohydrate, iminodiacetic acid and methyliminodiacetic acid were investigated at room temperature. The observed species in glycyl-L-glutamine monohydrate powders were attributed to the CH 2Ċ NHCOOH radical; and those in iminodiacetic acid and methyliminodiacetic acid powders to the HNĊHCH 2 (COOH) 2 and H 3 CNĊHCH 2 (COOH) 2 radicals respectively. The spectra were computer simulated and the g values of the radicals and the hyperfine structure constants of the unpaired electron with nearby protons and 14 N nucleus were determined. The results were found to be in good agreement with the existing literature data.

Gama Işınları ile Işınlanmış Amino Asit Türevlerinin EPR ve Simulasyon Metodu ile İncelenmesi

“…The g value measured from the spectrum of DL-asparagine monohydrate is g= 2.0024. It can be expressed that the g value of the radical discussed here in agreement with the literature data [28][29][30][31]. The simulated spectra in Figure 3c…”

L-Prolin ve L-Serin’de Oluşan Serbest Radikallerin EPR Çalışması

“…The g factor measured in the spectrum is g = 2.0029. The coupling constants and g values seem to agree with the literature values [13][14][15][16][17][18]. The hyperfine splitting constants are determined by the simulation method.…”

Identification of free radicals induced by gamma irradiation in amino acid derivatives

“…The experimental and simulated EPR spectrum is found to agree well with each other. The above given values of the hyperfine coupling constant agree well with some other literature values of amine radicals [28][29][30][31][32]. Single crystal of the gamma irradiated Nα-acetyl L-glutamic acid has been investigated at room temperature and the radiation damage centre of this sample has attributed to the HOOCCH 2 CH 2Ċ (NHCOCH 3 )COOH radical [33].…”