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Collision-induced ionization of neutral peptides

✍ Scribed by Zhuchun Wu; Catherine Fenselau

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
513 KB
Volume
28
Category
Article
ISSN
1076-5174

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✦ Synopsis

A four-sector mass spectrometer was employed to study fragments formed by the highsnergy collision of neutral peptides with molecular oxygen. Neutral peptides were generated in the gas phase from proton-bound dimers by the method of Wesdemiotis and co-workers [ A n d C k m . 65, 1594 (1993)l. B/E scanning was used in M S 2 to collect the fragment ions from neutral precursors. Molecular ions (radical ions) were not obtained in most of the spectra, but a variety of fragment ions were recorded. High resolution and mass accuracy allowed most fragment ions to be assigned. Most fragment ions are of the same types as those produced from protonated peptides by collisional activation. Formation of y-type ions is significantly reduced in the processes induced by collisional ionization, compared with high-and lowenergy collisional activation of protonated peptide precursors.

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