Logically derived sequence tandem mass spectrometry for structural determination of Galactose oligosaccharides

• Published in: Glycoconjugate journal Vol. 38; no. 2; pp. 177 - 189
• Main Authors: Huang, Shih-Pei, Hsu, Hsu Chen, Liew, Chia Yen, Tsai, Shang-Ting, Ni, Chi-Kung
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.04.2021; Springer Nature B.V
• Subjects: Adducts; Biochemistry; Biomedical and Life Sciences; Carbohydrate Conformation; Disaccharides; Galactose; Galactose - chemistry; Hexose; Ions; Life Sciences; Mass spectrometry; Mass Spectrometry and the Analysis of Glycoconjugates; Mass spectroscopy; Monosaccharides; Nucleotide sequence; Oligosaccharides; Oligosaccharides - analysis; Oligosaccharides - chemistry; Original Article; Pathology; Scientific imaging; Spectrometry, Mass, Electrospray Ionization; Tandem Mass Spectrometry - methods; Multistage tandem mass spectrometry; Collision induced dissociation; Anomeric configuration; Logically derived sequence; Oligosaccharide; LODES/MS; LODES/MSn
• ISSN: 0282-0080; 1573-4986
• DOI: 10.1007/s10719-020-09915-1

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 (MS n ), 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/MS n is a general method that can be used for the structural determination of hexose oligosaccharides. LODES/MS n has the potential to be extended to oligosaccharides containing other monosaccharides provided the dissociation mechanisms are understood and the corresponding disaccharide database is available.