ISSN:
0951-4198
Schlagwort(e):
Chemistry
;
Analytical Chemistry and Spectroscopy
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Physik
Notizen:
The positive-ion mass spectra of a number of didehydro amino acids (DDAA) obtained by electron ionization (EI) and chemical ionization (CI) using different regent gases as well as the collision-induced dissociation (CID) of mass-selected odd-electron ions and/or protonated molecules have been performed on a multiple quadrupole instrument. The positive-ion EI/CI mass spectra presented display a number of differences which are expected from different isomeric structures. Furthermore, differences associated with the proton affinities of the reagent gases are clearly evident in the poisitive-ion chemical ionization mass spectra as well as in some CID spectra of protonated molecules. This investigation demonstrates the suitability of chemical ionization for characterization of isomers of this important class of compounds and underlines the effect of the proton affinity of the reagent gas on the overall character of the positive-ion chemical ionization spectra.
Zusätzliches Material:
6 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/rcm.1290050609
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