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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. 1.

Fig. 1

Differential isotopic 18O/16O substitutions in ATP molecule phosphoryls (a). Oxygen tags: αb – alpha bridge, αp – alpha peripheral, βb – beta bridge, βp – beta peripheral, γb - gamma bridge, γp – gamma peripheral. Enzymatic reactions involved in 18O enrichment of ATP α-, β- and γ-phosphoryls (b). FFA - free fatty acids; AA - amino acids; PDE- phosphodiesterase.