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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 a k-CN glycopeptide with m/z 1517.61 Da assigned as [GEP¹⁵²TS¹⁵⁴TPT + GalNAc₂ + Gal₂ − H]⁻. (b) Positive ion mode MS/MS spectrum of the same glycopeptide with m/z 1541.61 Da and assigned as (GEP¹⁵²TS¹⁵⁴TPT + GalNAc₂ + Gal₂ + Na)⁺. Rectangles () and circles () represent GalNAc and Gal residues, respectively.

Inline graphic — (a) Negative ion mode MALDI FT ICR MS/MS spectrum of a k-CN glycopeptide with m/z 1517.61 Da assigned as [GEP¹⁵²TS¹⁵⁴TPT + GalNAc₂ + Gal₂ − H]⁻. (b) Positive ion mode MS/MS spectrum of the same glycopeptide with m/z 1541.61 Da and assigned as (GEP¹⁵²TS¹⁵⁴TPT + GalNAc₂ + Gal₂ + Na)⁺. Rectangles () and circles () represent GalNAc and Gal residues, respectively.