Radiation chemistry of an aqueous solution of glycine: compounds of interest to chemical evolution studies |
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Authors: | Z D Draganić V Niketić S I Vujošević |
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Institution: | (1) Centro de Estudios Nucleares, Universidad Nacional Autónoma de Mexico, Circuito Exterior, CU, A. Postal 70-543, 04510 Mexico, DF, Mexico;(2) Department of Chemistry, Faculty of Science, University of Beograd, POB 550, YU 11001 Beograd, Yugoslavia;(3) Present address: Boris Kidri Institute of Nuclear Sciences, POB 522, YU 11001 Beograd, Yugoslavia |
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Abstract: | Summary We have examined the radiolysis of an O2-free aqueous solution of glycine at absorbed doses of60Co gamma-radiation of up to 20 Mrad. At least 20 compounds are formed during radiolysis, among them several amino acids, an oligoamine, and the nitrogen-free polymers (Mw28,000 daltons). When dicyandiamide is present in the solution of glycine, various nitrogen-containing products, including some polymers (Mw12,000 daltons), are synthesized along with radiolytic products of glycine; polyglycines are not formed. We have determined the radiation-chemical yields of radiolytic-product formation and of decomposition of glycine, and have considered possible free-radical reactions leading to the radiation-induced changes observed. |
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Keywords: | Glycine Amino acids Aqueous solutions Radiolysis Dicyandiamide Chemical evolution Ionizing radiation |
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