𝔖 Bobbio Scriptorium
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Electrospray mass spectra of protein cations formed in basic solutions

✍ Scribed by J. C. Y. Le Blanc; Jianyao Wang; Roger Guevremont; K. W. M. Siu

Book ID
102965984
Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
586 KB
Volume
29
Category
Article
ISSN
1076-5174

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✦ Synopsis

The electrospray mass spectra of gramicidin S cations that originated from 0.2 hi solutions of 18 nitrogencontaining bases were examined. The relative abundances of the [ M + 2H ] '+ to the I M + H ] + ion were found to correlate not with the solution pH but with the proton affinities of the bases. It is postulated that some of the IM + 2HI" and the [ M + HI + ions exist as adducts with the nitrogen bases in solution, these adducts being desorbed into the gas phase during electrospray and dissociated in the lens region via collision-induced dissociations to yield apparent proton attachment spectra. Some of these adducts were observed under nominally zero collision energy conditions.

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