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Updated: Dec 28, 2025

Mass Spectrometric Analysis of Glycosphingolipid Antigens
Published on: April 16, 2013
Logically derived sequence tandem mass spectrometry for structural determination of Galactose oligosaccharides
Shih-Pei Huang1, Hsu Chen Hsu1, Chia Yen Liew1,2
1Institute of Atomic and Molecular Sciences, Academia Sinica, P. O. Box 23-166, Taipei, 10617, Taiwan.
Abstract:
Mass spectrometry has high sensitivity and is widely used in the identification of molecular structures, however, the structural determination of oligosaccharides through mass spectrometry is still challenging. A novel method, namely the logically derived sequence (LODES) tandem mass spectrometry (MSn), for the structural determination of underivatized oligosaccharides was developed. This method, which is based on the dissociation mechanisms, involves sequential low-energy collision-induced dissociation (CID) of sodium ion adducts, a logical sequence for identifying the structurally decisive product ions for subsequent CID, and a specially prepared disaccharide CID spectrum database. In this work, we reported the assignment of the specially prepared galactose disaccharide CID spectra. We used galactose trisaccharides and tetrasaccharides as examples to demonstrate LODES/MSn is a general method that can be used for the structural determination of hexose oligosaccharides. LODES/MSn has the potential to be extended to oligosaccharides containing other monosaccharides provided the dissociation mechanisms are understood and the corresponding disaccharide database is available.
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