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

Abstract

Powders of N-acetyl-L-leucine and N-methyl-L-glutamic acid were gamma irradiated and the free radicals formed were investigated at room temperature by electron paramagnetic resonance technique. The free radicals formed in compounds were attributed to the (CH 3 ) 2Ċ CH 2 CH(NHCOCH 3 )COOH and HOOCCH 2 CH 2Ċ (NHCH 3 )COOH radicals respectively. Both radicals are very stable and we could observe them for five months without almost intensity diminution at room temperature. The g values of the radicals and the hyperfine structure constants of the free electron with nearby protons and 14 N nucleus were determined. The results were found to be in good agreement with the existing literature data.

Tuning the grade of graphene: Gamma ray irradiation of free-standing graphene oxide films in gaseous phase

“…Recently, radiation chemistry by gamma ray irradiation, a simple and efficient strategy to uniformly induce chemical reactions in solutions via production of reactive radicals [27,28] has been used to reduce GO suspended either in aqueous solution or organic solvents [29][30][31][32][33][34][35]. Radicals, such as ethoxy or hydronium [36,37] generated across the solvent act as reducing agents against oxygen functional groups present on the GO surface. However, a limitation of any solution based reduction processes resides in subsequent aggregation and partial restacking of functionalized or reduced GO into macro-clusters due to strong hydrophobic interactions between sp2 carbons across the graphene planes, making any further reprocessing or chemical modifications in solution challenging and largely inefficient [38].…”

EPR and FT-IR spectroscopic studies of l-lysine monohydrochloride and l-glutamic acid hydrochloride powders

“…Lysine and glutamic acid are biologically important organic compounds [1,2]. Lysine is an amino acid present in relatively large amounts in the nuclear histone [3].…”