✦ LIBER ✦

Measurement of initial translational energies of peptide ions in laser desorption/ionization mass spectrometry

✍ Scribed by Ying Pan; Robert J. Cotter

Publisher: John Wiley and Sons
Year: 1992
Tongue: English
Weight: 453 KB
Volume: 27
Category: Article
ISSN: 1076-5174
DOI: 10.1002/oms.1210270103

No coin nor oath required. For personal study only.

✦ Synopsis

The initial kinetic energy distribution of [Argl-vasopressin molecular ions generated by matrix-assisted UV laser desorption/ionization was measured using a delayed ion extraction, linear time-of-flight mass spectrometer. Energy distributions of the nicotinic acid matrix ions, with or without the presence of peptide, were also measured. These were compared with the kinetic energy distribution of grarnicidin-s ions using IR laser desorption. The measured molecular ion kinetic energy distribution from vasopressin is much broader than that from gramicidin-S, and is characterized by a highenergy tail that most likely results from entrainment of anlayte ions in the higher velocity matrix ions and fragments as they leave the surface.

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