EPR Study of Gamma Irradiated DL-Methionine Sulfone Single Crystals

Abstract

Electron paramagnetic resonance (EPR) study of gamma irradiated dl-2-amino-4-(Methylsulfonyl) butyric acid (dl-methionine sulfone, hereafter dl-ABA) single crystals and powder was performed at room temperature. It has been found that this compound indicates the existence of C.O2- and N.H2 radicals after γ-irradiation. While g and hyperfine splitting values for the N.H2 radical were observed, for the C.O2- radical, only the g factor was measured. The EPR spectra have shown that N.H2 radical has two groups each having two distinct sites and C.O2- radical has one site. The principal g and hyperfine values for all sites were analyzed. © 2015 Elsevier B.V.