ISSN:
0030-493X
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The types and intensities of tandem mass spectrometric products of side-chain interactions were investigated with a hybrid tandem instrument. Positive-ion unimolecular decomposition and collisionally activated decomposition studies were conducted on the [M + H]+ ions of two N-benzyloxycarbonyl (Cbz or Z)-protected tripeptides, Cbz-Gly-Leu-Arg-NH2 and Cbz-Gly-Pro-Arg-NH2. The loss of benzyl alcohol (108 u) and the formation of other significant product ions and their dependence on collision energy and gas pressure suggest reaction between both ends of the molecule. Replacement of leucine with proline at the second position in the tripeptide produces a very intense [M + H - 108]+ ion and fewer lower mass fragment ions in the tandem mass spectra for Cbz-Gly-Pro-Arg-NH2 than in those for Cbz-Gly-Leu-Arg-NH2.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/oms.1210280210