Electron spray ionization mass spectrometry and 2D 31P NMR for monitoring 18O/16O isotope exchange and turnover rates of metabolic oligophosphates

Emirhan Nemutlu, Nenad Juranic, Song Zhang, Lawrence E. Ward, Tumpa Dutta, K. Sreekumaran Nair, Andre Terzic, Slobodan Macura, Petras P. Dzeja

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


A new method was here developed for the determination of 18O-labeling ratios in metabolic oligophosphates, such as ATP, at different phosphoryl moieties (α-, β-, and γ-ATP) using sensitive and rapid electrospray ionization mass spectrometry (ESI-MS). The ESI-MS-based method for monitoring of 18O/16O exchange was validated with gas chromatography-mass spectrometry and 2D 31P NMR correlation spectroscopy, the current standard methods in labeling studies. Significant correlation was found between isotopomer selective 2D 31P NMR spectroscopy and isotopomer less selective ESI-MS method. Results demonstrate that ESI-MS provides a robust analytical platform for simultaneous determination of levels, 18O-labeling kinetics and turnover rates of α-, β-, and γ-phosphoryls in ATP molecule. Such method is advantageous for large scale dynamic phosphometabolomic profiling of metabolic networks and acquiring information on the status of probed cellular energetic system.

Original languageEnglish (US)
Pages (from-to)697-706
Number of pages10
JournalAnalytical and bioanalytical chemistry
Issue number3
StatePublished - May 2012


  • ATP
  • ESI-MS
  • Energy metabolism
  • O isotope labeling
  • P NMR
  • Phosphotransfer networks

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry

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