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Quantitative metabolomics using ID-MS.

S Aljoscha Wahl1, Reza Maleki Seifar, Angela Ten Pierick

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Summary

Quantitative metabolite measurements are crucial for systems biology. Using labeled biomass (13C extract) as an internal standard significantly improves the accuracy and reproducibility of intracellular metabolite quantification via mass spectrometry (MS).

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Area of Science:

  • Metabolomics
  • Systems Biology
  • Analytical Chemistry

Background:

  • Accurate intracellular metabolite quantification is vital for systems biology and cellular metabolism modeling.
  • Mass spectrometry (MS)-based quantification faces challenges including complex sample matrices, interfering compounds, and salt effects on ionization efficiency.
  • Internal standards are necessary to mitigate quantification errors.

Purpose of the Study:

  • To evaluate the utility of labeled biomass (13C extract) as an internal standard for improving quantitative metabolite measurements.
  • To assess the impact of internal standards on the accuracy and reproducibility of intracellular metabolite concentrations.

Main Methods:

  • Quantitative analysis of intracellular metabolites using liquid chromatography-mass spectrometry (LC-MS) and gas chromatography-mass spectrometry (GC-MS).
  • Application of labeled biomass (13C extract) as an internal standard during sample processing and MS analysis.
  • Comparison of measurement variability with and without the use of internal standards.

Main Results:

  • The use of labeled biomass (13C extract) as an internal standard significantly reduced the standard deviations in intracellular concentration measurements.
  • Improved technical reproducibility was observed when employing labeled biomass.
  • Approximately 110 different metabolites can be quantified using combined LC-MS and GC-MS platforms.

Conclusions:

  • Labeled biomass (13C extract) is a valuable internal standard for enhancing the reliability of quantitative metabolomics.
  • This approach improves the accuracy and reproducibility of intracellular metabolite measurements, crucial for systems biology applications.
  • The combined use of LC-MS and GC-MS enables comprehensive metabolite profiling.