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. Author manuscript; available in PMC: 2013 May 1.
Published in final edited form as: Anal Bioanal Chem. 2012 Mar 18;403(3):697–706. doi: 10.1007/s00216-012-5899-5

Fig. 5.

Fig. 5

Correlation of ESI-MS and GC-MS methods on γ-ATP, β-ATP and α-ATP 18O labeling expressed as % of oxygens replaced (a), Sample concentration effect on the accuracy of calculation of cumulative percentage of 18O incorporation into ATP (b).