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Type: Artigo de periódico
Title: Ionic dissociation of glycine, alanine, valine and proline as induced by VUV (21.21 eV) photons
Author: Lago, AF
Coutinho, LH
Marinho, RRT
de Brito, AN
de Souza, GGB
Abstract: Ionic fragmentation of the sublimated alpha-amino acids glycine, L-alanine, L-proline and L-valine has been studied using a time-off-light mass spectrometer coupled to a He I lamp (hv = 21.21 eV). Partial ion yields (branching ratios) and kinetic energy releases for the fragments have been determined. The spectra basically resemble available mass spectra obtained through electron impact (70 eV) demonstrating that the ionic dissociation of these compounds, induced by energetic electrons, is also dominated by processes involving low-energy valence-shell orbitals. A previously unreported fragment has been observed at m/z = 32 (O-2(+)) in the spectra of valine 2 and proline. (C) 2004 Elsevier B.V. All rights reserved.
Subject: TOFMS
amino acids
vapour phase
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.chemphys.2004.06.052
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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