Factors That Impact the Vacuum Ultraviolet Photofragmentation of Peptide Ions

Several groups have investigated the photodissociation of peptide ions with ultraviolet light. Significant differences have been reported with 157 and 193 nm excitation. Recent studies have shown that the mass analyzer can also influence the observed photofragment distribution. Comparison of experim...

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Bibliographic Details
Published in:Journal of the American Society for Mass Spectrometry 2007-08, Vol.18 (8), p.1439-1452
Main Authors: Thompson, Matthew S., Cui, Weidong, Reilly, James P.
Format: Article
Language:English
Subjects:
Amino Acid Sequence
Analytical, structural and metabolic biochemistry
Analyzers
Biological and medical sciences
Desorption
Electrochemistry - methods
Fundamental and applied biological sciences. Psychology
General aspects, investigation methods
Ion distribution
Ions
Mass spectrometers
Mass spectrometry
Peptide Mapping
Peptides
Peptides - chemical synthesis
Peptides - chemistry
Photochemistry - methods
Photodissociation
Proteins
Spectrometers
Spectrophotometry, Ultraviolet - methods
Vacuum
Wavelengths
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Summary:Several groups have investigated the photodissociation of peptide ions with ultraviolet light. Significant differences have been reported with 157 and 193 nm excitation. Recent studies have shown that the mass analyzer can also influence the observed photofragment distribution. Comparison of experiments using different peptides, wavelengths, and mass analyzers is undesirably complicated. In the present work, several peptides are analyzed with both 157 and 193 nm photodissociation in tandem-TOF and linear ion trap mass spectrometers. The results indicate that the fragment ion distribution can be influenced by both the photodissociation wavelength and the mass analyzer. The two wavelengths generate similar spectra in an ion trap but quite different results in a tandem-TOF instrument.
ISSN:1044-0305
1879-1123
DOI:10.1016/j.jasms.2007.04.015