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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

Table 2. High resolution and high mass accuracy MS is necessary for interpretation of saccharide composition.

The mass errors from two different potential assignments for the observed monoisotopic masses for saccharides composed of two to five tetrasaccharide repeats are listed in the table. Saccharide compositions are given as [GalNAcAN, QuiNAc, Qui4NFm] [HexNAc, Hex, Kdo].

Observed Peaks (m/z) Charge Interpretation #1 Mass error for assignment #1 (ppm) Interpretation #2 Mass error for assignment #2 (ppm)
846.3090 2 [2,0,1][1,4,1] 32.4 [4,2,2][0,0,0] 3.5
1242.4604 2 [4,1,2][1,4,1] 22.2 [6,3,3][0,0,0] 2.5
1107.4107 3 [6,2,3][1,4,1] 19.8 [8,4,4][0,0,0] 5.1
1371.5132 3 [8,3,4][1,4,1] 17.2 [10,5,5][0,0,0] 5.3