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Optimization of a direct analysis in real time/time-of-flight mass spectrometry method for rapid serum metabolomic fingerprinting

  • Manshui Zhou
  • John F. McDonald
  • Facundo M. FernándezEmail author
Article

Abstract

Metabolomic fingerprinting of bodily fluids can reveal the underlying causes of metabolic disorders associated with many diseases, and has thus been recognized as a potential tool for disease diagnosis and prognosis following therapy. Here we report a rapid approach in which direct analysis in real time (DART) coupled with time-of-flight (TOF) mass spectrometry (MS) and hybrid quadrupole TOF (Q-TOF) MS is used as a means for metabolomic fingerprinting of human serum. In this approach, serum samples are first treated to precipitate proteins, and the volatility of the remaining metabolites increased by derivatization, followed by DART MS analysis. Maximum DART MS performance was obtained by optimizing instrumental parameters such as ionizing gas temperature and flow rate for the analysis of identical aliquots of a healthy human serum samples. These variables were observed to have a significant effect on the overall mass range of the metabolites detected as well as the signal-to-noise ratios in DART mass spectra. Each DART run requires only 1.2 min, during which more than 1500 different spectral features are observed in a time-dependent fashion. A repeatability of 4.1% to 4.5% was obtained for the total ion signal using a manual sampling arm. With the appealing features of high-throughput, lack of memory effects, and simplicity, DART MS has shown potential to become an invaluable tool for metabolomic fingerprinting.

Keywords

Helium Flow Rate Mass Spectrometer Inlet Flow Atmospheric Pressure Afterglow Dielectric Barrier Discharge Ionization Metabolomic Fingerprinting 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Supplementary material

13361_2011_210100068_MOESM1_ESM.doc (516 kb)
Supplementary material, approximately 528 KB.

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Copyright information

© American Society for Mass Spectrometry 2010

Authors and Affiliations

  • Manshui Zhou
    • 1
  • John F. McDonald
    • 2
    • 3
  • Facundo M. Fernández
    • 1
    Email author
  1. 1.School of Chemistry and BiochemistryGeorgia Institute of TechnologyAtlantaUSA
  2. 2.School of BiologyGeorgia Institute of TechnologyAtlantaUSA
  3. 3.Ovarian Cancer InstituteAtlantaUSA

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