An electron spin resonance study of free radical reactions in gamma-irradiated n-acetyl-l-valine

Hill D.J.T., Ho S.-Y., O'Donnell J.H. and Pomery P.J. (1985) An electron spin resonance study of free radical reactions in gamma-irradiated n-acetyl-l-valine. Radiation Physics and Chemistry, 26 2: 179-189. doi:10.1016/0146-5724(85)90183-9


Author Hill D.J.T.
Ho S.-Y.
O'Donnell J.H.
Pomery P.J.
Title An electron spin resonance study of free radical reactions in gamma-irradiated n-acetyl-l-valine
Journal name Radiation Physics and Chemistry
ISSN 0146-5724
Publication date 1985
Sub-type Article (original research)
DOI 10.1016/0146-5724(85)90183-9
Volume 26
Issue 2
Start page 179
End page 189
Total pages 11
Subject 3108 Radiation
Abstract The radicals formed on γ radiolysis of N-acetyl-L-valine in the polycrystalline state at 77 K, at ambient temperature (303 K), and on subsequent warming over the range 77-440 K are reported. Radical anions CH3C(O-)NHCH(CH(CH3)2)COOH and neutral radicals CH3CONHCH(CH(CH3)2), believed to be decomposition products of radical cations, were observed at 77 K. On warming the radical anions decay to nonparamagnetic species while the neutral radicals abstract hydrogen from parent molecules to produce the radicals CH3CONHC(CH(CH3)2)COOH and CH3CONHCH(C(CH3)2)COOH. The α-carbon radicals are the predominant radical species at room temperature. Further warming causes these radicals to decay over the temperature range 350- 440 K. A mechanism for the radiation degradation is suggested, based upon the identification of the radical intermediates and the measurement of their concentrations, and the observation, that the major volatile product is carbon dioxide.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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