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. Author manuscript; available in PMC: 2009 Sep 22.
Published in final edited form as: Chem Biol. 2008 Sep 22;15(9):881–892. doi: 10.1016/j.chembiol.2008.07.016

Figure 4.

Figure 4

Example of the utility of multistage fragmentation of B-ions generated from permethylated glycans. A retro-Diels-Alder reaction in a 1,4-linked B2-type Hex-Hex disaccharide, shows formation of an m/z 329 ion from an m/z 445 ion (A). The m/z 139 ion is generally of low abundance or absent, presumably due to the stronger affinity for the metal ion charge carrier by the larger fragments. (B) shows the generic cross-ring cleavages that may be formed from B-type ions of various linkages. R indicates the location of mono- or oligosaccharide substituents. (Ashline, et al., 2005). ©2005, American Chemical Society, used with permission.