ISSN:
0951-4198
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Physics
Notes:
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.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/rcm.1290050609
