EPR studies of the free radicals generated in gamma irradiated amino acid derivatives
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Tarih
2017
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Bv
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Gamma irradiated powder forms of N-acetyl-DL-aspartic acid, N-carbamoyl-DL-aspartic acid and N-methyl-L-serine were investigated by electron paramagnetic resonance spectroscopy (EPR) at room temperature. In these compounds, the paramagnetic centers formed after irradiation were attributed to the HOOCCH2(C)over dotHCOOH, COOH(C)over dotHCHNH and HOCH2(C)over dotHCOOH radicals, respectively. The g values and the hyperfine coupling constants for the radical species are with values of g = 2.0038 +/- 0.0005, a(alpha) = 2.15 mT, a(beta)((1)) = 3.84 mT and a(beta)((2)) = 2.15 for the first radical, g = 2.0039 +/- 0.0005, a(alpha) = 1.7 mT, a(beta)((1)) = 0.62 mT, a(beta)((2)) = 0.54 mT, a(gamma) = 0.53 mT for the second radical and g = 2.0039 +/- 0.0005, a(beta)((1)) = 2.40 mT, a(beta)((2)) = 1.83 mT and a(alpha) = 1.83 mT for the third radical. The free radicals formed in three compounds were found to be stable for three months at room temperature. It was concluded that, spin density was concentrated predominantly in the 2p(pi) orbital of the carbon atom. (C) 2017 Elsevier B.V. All rights reserved.
Açıklama
Anahtar Kelimeler
Epr, Free Radicals, Amino Acid Derivatives, Gamma Irradiation
Kaynak
Journal of Molecular Structure
WoS Q Değeri
Q3
Scopus Q Değeri
Q1
Cilt
1145
