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. Author manuscript; available in PMC: 2012 Aug 15.

Published in final edited form as: Int J Mass Spectrom. 2011 Aug 15;305(2-3):131–137. doi: 10.1016/j.ijms.2010.10.017

(A) Representative tandem mass spectrum of 2AA labeled CS: CSC dp12-2AA. The ion at m/z 458 is an internal fragment ion commonly observed for CS oligosaccharides. The inset diagrams the product ions observed. The Y₁₁ is observed as a low abundance ion at m/z 451.8 (not labeled). Loss of SO₃ is abbreviated as “S”. (B) Comparison of product ion abundances from CAD tandem MS of Δdp 12-2AA from CSA, CSB, and CSC, respectively. TIA = total ion abundance.

(A) Representative tandem mass spectrum of 2AA labeled CS: CSC dp12-2AA. The ion at m/z 458 is an internal fragment ion commonly observed for CS oligosaccharides. The inset diagrams the product ions observed. The Y₁₁ is observed as a low abundance ion at m/z 451.8 (not labeled). Loss of SO₃ is abbreviated as “S”. (B) Comparison of product ion abundances from CAD tandem MS of Δdp 12-2AA from CSA, CSB, and CSC, respectively. TIA = total ion abundance.