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. Author manuscript; available in PMC: 2020 Feb 5.
Published in final edited form as: Anal Chem. 2019 Jan 10;91(3):1838–1846. doi: 10.1021/acs.analchem.8b03132

Table 1.

Labeling conditions and expected masses for a metabolite of mass M with C carbon atoms and N nitrogen atoms.

Media Mass
Unlabeled M
15N-ammonia M+0.9970 N
13C-glucose M+1.0034 C
15N-ammonia, 13C-glucose M+0.9970 N+1.0034 C