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Wu H, Allison J. Characterization of the primary thermal degradation processes of peptides using the mass spectrometric technique K(+)IDS, K (+) ionization of desorbed species. J Am Soc Mass Spectrom. 1994;5(6):564-75doi: 10.1016/1044-0305(94)90006-X.
Wu, H., & Allison, J. (1994). Characterization of the primary thermal degradation processes of peptides using the mass spectrometric technique K(+)IDS, K (+) ionization of desorbed species. Journal of the American Society for Mass Spectrometry, 5(6), 564-75. https://doi.org/10.1016/1044-0305(94)90006-X
Wu, H, and Allison, J. "Characterization of the primary thermal degradation processes of peptides using the mass spectrometric technique K(+)IDS, K (+) ionization of desorbed species." Journal of the American Society for Mass Spectrometry vol. 5,6 (1994): 564-75. doi: https://doi.org/10.1016/1044-0305(94)90006-X
Wu H, Allison J. Characterization of the primary thermal degradation processes of peptides using the mass spectrometric technique K(+)IDS, K (+) ionization of desorbed species. J Am Soc Mass Spectrom. 1994 Jun;5(6):564-75. doi: 10.1016/1044-0305(94)90006-X. PMID: 24222625.
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J Am Soc Mass Spectrom. 1994 Jun;5(6):564-75. doi: 10.1016/1044-0305(94)90006-X.

Characterization of the primary thermal degradation processes of peptides using the mass spectrometric technique K(+)IDS, K (+) ionization of desorbed species.

Journal of the American Society for Mass Spectrometry

H Wu, J Allison

Affiliations

  1. Department of Chemistry, Michigan State University, East Lansing, MI, USA.

PMID: 24222625 DOI: 10.1016/1044-0305(94)90006-X

Abstract

The mass spectrometric technique of K(+) ionization of desorbed species, K(+)IDS, is used here to characterize the primary thermal degradation chemistry of small peptides. In this technique, a small amount of a compound is rapidly heated in the condensed phase. Desorption of the intact molecule can occur. Also, thermal degradation products are formed which quickly desorb as well, rather than remain on the surface and undergo subsequent chemistry. The desorbed molecules form adducts with gas phase K(+) ions, and a mass spectrum is obtained. Deuterium labeling experiments, and the use of derivatizing reagents, allows for the thermal degradation chemistry of small peptides to be elucidated. Apparently, skeletal bond cleavages are accompanied by H-shifts, although the hydrogen atoms shift from "remote" sites, brought into close proximity with the fragmenting skeletal bond via secondary interactions. Experimental results are presented that allow for correlations between thermal degradation chemistry and the resulting K(+)IDS mass spectra to be made.

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