Solid-phase analytical derivatization for gas-chromatography-mass-spectrometry-based metabolomics.

Area of Science:

• Analytical Chemistry
• Biochemistry
• Metabolomics

Background:

• Gas chromatography/mass spectrometry (GC/MS) is a powerful tool for metabolomics.
• Conventional derivatization methods can be time-consuming and complex.
• There is a need for efficient and high-throughput sample preparation techniques for GC/MS-based metabolomics.

Purpose of the Study:

• To develop a novel solid-phase analytical derivatization (SPAD) method for GC/MS-based metabolomics.
• To optimize the SPAD method for methoximation and trimethylsilylation.
• To evaluate the efficiency and applicability of the SPAD method for human plasma analysis.

Main Methods:

• Developed a SPAD method combining strong anion and cation exchange for derivatization.
• Utilized large-volume injection mode with a stomach-shaped insert to omit sample condensation.
• Optimized methoximation (3 min) and trimethylsilylation (10 min) steps.
• Investigated the effects of coexisting substances like saccharides and sodium chloride.

Main Results:

• Achieved optimal derivatization conditions with specific reagent volumes and reaction times.
• Demonstrated efficient elution of derivatized analytes.
• Showed that coexisting saccharides did not significantly affect derivatization and could be washed out.
• Confirmed that sodium chloride interference could be mitigated by sample dilution.
• The SPAD method enabled derivatization of both anionic and cationic metabolites.
• Achieved comparable metabolite coverage to conventional methods.

Conclusions:

• The developed SPAD method offers a novel, efficient, and high-throughput approach for GC/MS-based metabolomics.
• This method is suitable for analyzing human plasma, providing broad metabolite coverage.
• This represents the first reported SPAD-based protocol for human plasma metabolome analysis.