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. Author manuscript; available in PMC: 2012 Dec 20.
Published in final edited form as: Biochemistry. 2011 Nov 28;50(50):10941–10950. doi: 10.1021/bi201450v

Figure 5. Multi-stage tandem mass spectra of the 18O labeled saccharide [4,2,2][0,0,0] reveals the reducing-end residue.

Figure 5

Tandem MS of the 18O labeled saccharide [4,2,2][0,0,0] was performed on an LTQ-Oribtrap XL mass spectrometer in positive ion mode. CID fragmentations of the precursor [M + 2Na]2+ m/z 825.2987 (A) and MS3 of the secondary product ion at m/z 835.3053 (B) are displayed on the chemical structures. Monosaccharide residues abbreviations QM (Qui4NFm), GN (GalNAcAN), and QC (QuiNAc) are shown inside the six-member rings for clarity. All fragments contain Na.