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Electron impact ionization tandem mass spectrometry of glycosphingolipids. Part III. Study of the fragmentation modes of selected glycosphingolipids

✍ Scribed by Jonathan M. Curtis; Jan Holgersson; Peter J. Derrick; Bo E. Samuelsson

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

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✦ Synopsis

Abstract

Results are presented from a systematic study of the high‐energy tandem mass spectra (fragment ion spectra) of derivitized (permethylation followed by LiAlH~4~ reduction) porcine glycosphingolipids (GSLs) using a four‐sector mass spectrometer. The ions studied were the ammonium ions of the GSLs formed on loss of the sphingosine side‐chain following electron impact ionization. Fragment ion spectra are shown to provide structural data useful in identifying carbohydrate sequence, the location of hexosamine residues and the identification of fatty acid chain length. Differences between the fragment ion spectra of isomers differing in carbohydrate linkage position and stereochemistry were observed, but not easily predicted.

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