Optimization of fecal sample homogenization for untargeted metabolomics

Area of Science:

• Metabolomics
• Biochemistry
• Analytical Chemistry

Background:

• Fecal samples are complex and heterogeneous, posing challenges for stool metabolomics.
• Inconsistent fecal sample preparation affects metabolite profiles and study reproducibility.
• A standardized method for fecal homogenization is lacking.

Purpose of the Study:

• To compare various homogenization conditions for fecal samples.
• To evaluate the impact of bead size, solvent addition, and lyophilization on homogenization.
• To determine optimal parameters for reproducible stool metabolomics.

Main Methods:

• Systematic alteration of homogenization parameters, including bead size and solvent usage.
• Comparison of wet-frozen and lyophilized fecal samples.
• Evaluation of metabolic coverage and reproducibility across different conditions.

Main Results:

• Mechanical and chemical lysis via bead-beating with mixed bead sizes in organic solvent is effective.
• This method provides adequate reproducibility and metabolic coverage.
• Lyophilization is a viable alternative when bead-beating is unavailable.

Conclusions:

• Comprehensive evaluation of fecal homogenization methods enhances understanding of their effects.
• The study provides insights for standardizing fecal sample homogenization protocols.
• Optimized homogenization is key for reliable stool metabolomics research.