title: An ESR study of the radicals in X-irradiated L-alpha-amino-n-butyric acid HCl containing 1.5% L-cysteine HCl.
abstract: After X-irradiation at room temperature, the radicals in L-alpha-amino-n-butyric acid HCl are CH3CH2CHCOOH. The beta- and alpha-hyperfine constants are typical of those found in amino acid radicals. On annealing at temperatures near 100 degrees C this carbon-centered radical in samples containing 1.5% cysteine converts to a perthiyl radical, RCH2S(1)S(2). The g-values for the perithiyl radical are 2.0024, 2.0257, and 2.0557. When the field is in the minimum g-value direction, the hyperfine splittings are 50 G for 33S(2) and 32 G for 33S(1).
authors.affiliation: Department of Physics, Wake Forest University, Winston-Salem, North Carolina 27109.
authors.forename: H
authors.initials: H
authors.lastname: Shields
authors.forename: Y
authors.initials: Y
authors.lastname: Haven
authors.forename: P J
authors.initials: PJ
authors.lastname: Hamrick
authors.forename: Y
authors.initials: Y
authors.lastname: Ma
mesh_terms: D000613:Aminobutyrates / Q000528:radiation effects*; D003545:Cysteine / Q000528:radiation effects*; D004578:Electron Spin Resonance Spectroscopy; D011854:Radiochemistry
chemical_list: D000613:Aminobutyrates; C012223:alpha-aminobutyric acid; D003545:Cysteine