Simple Approach for De Novo Structural Identification of Mannose Trisaccharides

Overview

Journal J Am Soc Mass Spectrom

Specialty Chemistry

Date 2017 Dec 14

PMID 29235038

Citations 10

Authors

Hsu Chen Hsu

Chia Yen Liew

Shih-Pei Huang

Shang-Ting Tsai

Chi-Kung Ni

Affiliations

Soon will be listed here.

Abstract

Oligosaccharides have diverse functions in biological systems. However, the structural determination of oligosaccharides remains difficult and has created a bottleneck in carbohydrate research. In this study, a new approach for the de novo structural determination of underivatized oligosaccharides is demonstrated. A low-energy collision-induced dissociation (CID) of sodium ion adducts was used to facilitate the cleavage of desired chemical bonds during the dissociation. The selection of fragments for the subsequent CID was guided using a procedure that we built from the understanding of the saccharide dissociation mechanism. The linkages, anomeric configurations, and branch locations of oligosaccharides were determined by comparing the CID spectra of oligosaccharide with the fragmentation patterns based on the dissociation mechanism and our specially prepared disaccharide CID spectrum database. The usefulness of this method was demonstrated to determine the structures of several mannose trisaccharides. This method can also be applied in the structural determination of oligosaccharides larger than trisaccharides and containing hexose other than mannose if authentic standards are available. Graphical Abstract.

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