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Evaluation of sample preparation protocols for quantitative NMR-based metabolomics.

Olga A Snytnikova1,2, Anastasiya A Khlichkina3,4, Renad Z Sagdeev3

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Metabolomics : Official Journal of the Metabolomic Society
|May 26, 2019
PubMed
Summary

Comparing sample preparation methods for NMR metabolomics, ethanol and methanol extractions offer minimal metabolite loss for blood serum. Methanol-chloroform extraction is optimal for lipid-rich tissues, while ultrafiltration causes significant metabolite loss.

Keywords:
1H NMR spectroscopyMetabolites extractionQuantitative metabolomicsSerum

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Spectroscopy

Background:

  • NMR spectroscopy for metabolite quantification is hindered by macromolecules and lipoproteins.
  • Effective protein and lipid removal is crucial for high-quality NMR spectra.

Purpose of the Study:

  • To evaluate various blood serum purification methods for 1H NMR metabolomic profiling.
  • To compare the effectiveness of different sample preparation techniques for NMR-based quantitative metabolomics.

Main Methods:

  • Comparison of ultrafiltration, methanol extraction, ethanol extraction (with/without lipid removal), and methanol-chloroform extraction.
  • Quantification of 30 abundant metabolites in human blood serum post-preparation.

Main Results:

  • Ultrafiltration achieved excellent lipid removal but resulted in significant, uneven metabolite loss.
  • Ethanol and methanol extractions showed comparable performance with minimal metabolite loss, suitable for low-lipid samples.
  • Additional lipid purification improved NMR spectra but increased metabolite loss.

Conclusions:

  • Methanol-chloroform extraction is optimal for high-lipid tissues, balancing lipid removal and metabolite loss.
  • Ultrafiltration is unsuitable for quantitative analysis due to substantial metabolite losses (up to 60%).
  • Ethanol and methanol extractions are ideal for low-lipid biological fluids and tissues.