Analysis types and quantification methods applied in UHPLC-MS metabolomics research: a tutorial

Area of Science:

• Metabolomics and Lipidomics
• Analytical Chemistry
• Biochemistry

Background:

• Untargeted, targeted, and semi-targeted analytical methods are used in metabolomics and lipidomics.
• Ultra High Performance Liquid Chromatography-Mass Spectrometry (UHPLC-MS) is a key technology for metabolite detection.
• Quantification methods report either normalized peak area or absolute concentration.

Purpose of the Study:

• Define similarities and differences between analytical approaches in metabolomics.
• Explain how to determine absolute metabolite concentrations.
• Discuss advantages and limitations regarding accuracy and precision.

Main Methods:

• Comparison of untargeted, targeted, and semi-targeted metabolomics strategies.
• Evaluation of UHPLC-MS for metabolite analysis.
• Review of quantification techniques for metabolite concentrations.

Main Results:

• Untargeted methods provide peak responses and fold changes, even for unknown metabolites.
• Targeted and semi-targeted methods require prior analyte knowledge.
• Absolute concentration determination necessitates validated, analyte-specific methods for accuracy and precision.

Conclusions:

• Method selection depends on metabolite knowledge and reporting requirements.
• Accurate metabolite quantification requires rigorous method validation.
• Understanding analytical approaches is crucial for reliable metabolomics data.