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. Author manuscript; available in PMC: 2011 Dec 1.

Published in final edited form as: Anal Chem. 2010 Nov 4;82(23):9654–9662. doi: 10.1021/ac101856r

(a) Negative ion mode MALDI FT ICR MS/MS spectrum of precursor ion with m/z 2034.70 Da assigned as [²⁵²NNS + GlcNAc₂ + Man₈ − H]⁻. (b) Positive ion mode MS/MS spectrum of corresponding sodiated peak with m/z 2058.68 Da assigned as [²⁵²NNS + GlcNAc₂ + Man₈ + Na]⁺. (c) Positive ion mode MS/MS spectrum of a di-sodiated peak with m/z 2080.68 Da assigned as [²⁵²NNS + GlcNAc₂ + Man₈ − H + 2Na]⁺. Circles () and squares () represent mannose and GlcNAc residues, respectively.

Inline graphic — (a) Negative ion mode MALDI FT ICR MS/MS spectrum of precursor ion with m/z 2034.70 Da assigned as [²⁵²NNS + GlcNAc₂ + Man₈ − H]⁻. (b) Positive ion mode MS/MS spectrum of corresponding sodiated peak with m/z 2058.68 Da assigned as [²⁵²NNS + GlcNAc₂ + Man₈ + Na]⁺. (c) Positive ion mode MS/MS spectrum of a di-sodiated peak with m/z 2080.68 Da assigned as [²⁵²NNS + GlcNAc₂ + Man₈ − H + 2Na]⁺. Circles () and squares () represent mannose and GlcNAc residues, respectively.