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Issue 0, 1976
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Electron spin resonance study of the reactions of hydrogen atoms in aqueous sulphuric acid glasses. Part 2.—Reaction with amino acids

Abstract

Reactions of hydrogen atoms with amino acids in vitreous 6 mol dm–3 sulphuric acid have been investigated. Glycine and alanine yield the species NH+3ĊR—in which the ammonium group adopts random fixed orientations. Radicals of the form CH3ĊRCR′R″— are observed from norleucine, norvaline, leucine, valine, isoleucine, isovaline and 2-amino-n-butyric acid. Glutamic acid, glutamine, aspartic acid, asparagine and 4-amino-n-butyric acid yield HO2CĊHCHR— radicals, while the species —CH2ĊHCH2— is identifiable in the spectra derived from lysine, ornithine, proline and 4-amino-n-butyric acid. Arginine and citrulline yield both—NHĊHCH2— and —CH2ĊHCH2— radicals. The spectra derived from serine and threoinine are ascribed to RĊ(OH)— radicals. Interpretation of spectra of the radicals formed from 2-aminoisobutyric acid, β-alanine, histidine, homoserine and hydroxyproline is also undertaken.

In several cases, evidence drawn from computer simulation of spectra indicates that the trapped radicals adopt a range of conformations; notable examples are the cases of norleucine, leucine, isoleucine and threonine. When a radical can adopt a range of conformations, apparently anomalous spectra arise due to the angular dependence of β-atom hyperfine interactions.

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Article type: Paper
DOI: 10.1039/F29767202001
J. Chem. Soc., Faraday Trans. 2, 1976,72, 2001-2013

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    Electron spin resonance study of the reactions of hydrogen atoms in aqueous sulphuric acid glasses. Part 2.—Reaction with amino acids

    H. R. Falle, F. S. Dainton and G. A. Salmon, J. Chem. Soc., Faraday Trans. 2, 1976, 72, 2001
    DOI: 10.1039/F29767202001

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