ISSN:
0030-493X
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Plasma desorption mass spectrometry (PDMS) was investigated as a means of analysing mixtures of three, four and five amino acids in both positive- and negative-ion modes. Fifteen mixtures were tested; each mixture contained equimolar amounts of selected amino acids. The PD mass spectra exhibited MH+ and [M - H]- molecular ions for all the aminoacids with different desorption-ionization yields. The spectra were more easily interpreted in the negative- than the positive-ion mode. The desorption order of the amino acids was progressively established by comparing the molecular ion desorption-ionization yields for each mixture. This desorption order was well correlated in both the positive- and negation-ion modes with the acid-base thermodynamic data for the amino acids in the gas phase. This observation gives some insight into the desorption-ionization mechanisms under PDMS conditions.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/oms.1210280908
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