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Gas Chromatography–Mass Spectrometry (GC–MS)01:14

Gas Chromatography–Mass Spectrometry (GC–MS)

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Gas chromatography–mass spectrometry (GC–MS) is the combination of analytical techniques of gas chromatography and mass spectrometry in a single instrument for analyzing a mixture of compounds. The gas chromatograph separates the compounds in the mixture, and the mass spectrometer analyzes each compound separately to determine the molecular masses and molecular structures.
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Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
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Best Practices in GC-MS and GC × GC-MS-Based Metabolomics and Volatile Analyses: An International Survey.

Ryland T Giebelhaus1, Michael Herold2, James J Harynuk3,4

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Standardized quality assurance and quality control (QA/QC) are vital for reproducible gas chromatography-mass spectrometry (GC-MS) metabolomics. This study surveyed 85 labs, revealing consensus on critical QA/QC practices and establishing evidence-based recommendations for high-quality data.

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Area of Science:

  • Metabolomics
  • Analytical Chemistry
  • Biotechnology

Background:

  • Reproducible metabolomics requires robust quality assurance and quality control (QA/QC).
  • Systematic documentation of current QA/QC practices in gas chromatography-mass spectrometry (GC-MS) metabolomics laboratories is lacking.
  • The Metabolomic Quality Assurance and Quality Control Consortium (mQACC) initiated a survey to address this gap.

Purpose of the Study:

  • To characterize current QA/QC implementation in GC-MS metabolomics laboratories worldwide.
  • To identify common practices and variations in QA/QC procedures.
  • To establish evidence-based recommendations for high-quality GC-MS metabolomics.

Main Methods:

  • Survey distributed to 85 laboratories across 27 countries.
  • Data collected on laboratory applications (untargeted, targeted, or both).
  • Information gathered on chromatography techniques, ionization methods, mass spectrometer types, and specific QA/QC practices.

Main Results:

  • Most labs use single-column chromatography, electron ionization, and low-resolution mass spectrometers, but a significant portion also employ multidimensional chromatography, chemical ionization, and high-resolution instruments.
  • >90% of labs use internal standards, perform leak checks, and maintain injector systems.
  • Routine monitoring includes method blanks, peak shape assessment, and evaluation of drifts, carryovers, and contamination; retention indices and library matching are primary annotation methods.

Conclusions:

  • A strong consensus exists on critical QA/QC practices for GC-MS metabolomics.
  • Evidence-based recommendations for best practices in QA/QC and reporting have been established.
  • The findings will advance the quality and reproducibility of GC-MS metabolomics studies globally.