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

Published in final edited form as: Anal Biochem. 2010 May 4;404(1):40–44. doi: 10.1016/j.ab.2010.04.035

Table 1.

m/z of precursor ions and neutral loss of unlabeled and labeled methylglucosamine

Methylglucosamine (Glc-MA)^a	Precursor ion	Neutral loss	Precursor ion/Fragment ion pair
Methylglucosamine (Glc-MA)^a	Precursor ion	Neutral loss	Precursor ion/Fragment ion pair	Glc-MA	196	152	196 → 44
Glc-1-¹³C-MA	197	152	197 → 45
Glc-2-¹³C-MA	197	153	197 → 44
Glc-1,2-¹³C-MA	198	153	198 → 45
Glc-D₇-MA	203	158	203 → 45
Glc-D₂-MA	198	154	198 → 44

^aThe quantification of unlabeled and labeled methylglucosamine can be performed by multiple reaction monitoring scans (MRM).