title: Aspartic acid as a trap for gamma-radiation energy in the amorphous Al5(OH)15(Asp)3.3H2O.
abstract: Paramagnetic molecular centers produced by gamma irradiation at 77 K and at room temperature in the novel compound Al5(OH)15(Asp)3.3H2O were studied by ESR spectroscopy. The g value of 2.0034 and the lack of such lines in pure aluminum hydroxide suggested that all the paramagnetic centers observed are related to the aspartic acid molecule. However, none of the paramagnetic centers gave an ESR spectrum characteristic for gamma-irradiated pure aspartic acid powder. The influence of the oxygen on the formation of the paramagnetic centers was noticed. The extreme stability of the paramagnetic molecular centers formed in Al5(OH)15(Asp)3.3H2O suggests that aspartic acid complexed in aluminum hydroxide is a good trap for gamma-radiation energy.
authors.affiliation: Ruder Bosović Institute, University of Zagreb, Croatia.
authors.forename: T A
authors.initials: TA
authors.lastname: Himdan
authors.forename: V
authors.initials: V
authors.lastname: Nöthig-Laslo
authors.forename: H
authors.initials: H
authors.lastname: Bilinski
mesh_terms: D000536:Aluminum Hydroxide / Q000528:radiation effects*; D001224:Aspartic Acid / Q000528:radiation effects*; D004578:Electron Spin Resonance Spectroscopy; D005720:Gamma Rays; D013696:Temperature
chemical_list: C077852:pentaaluminum pentadecahydroxide aspartyl-aspartyl-aspartic acid; D001224:Aspartic Acid; D000536:Aluminum Hydroxide