Comparison of Microflow and Analytical Flow Liquid Chromatography Coupled to Mass Spectrometry Global Metabolomics...

Area of Science:

• Analytical Chemistry
• Metabolomics
• Biochemistry

Background:

• Microscale separations offer advantages in metabolomics, including higher sensitivity, reduced solvent use, and smaller sample requirements.
• Recent advancements include ion-pair free microflow-based global metabolomics methods.

Purpose of the Study:

• To compare the performance of ion-pair free microflow metabolomics methods against traditional analytical flow ion-pairing methods.
• To evaluate these methods using samples from a urea cycle disorder (UCD) mouse model.

Main Methods:

• Analysis of mouse urine and brain homogenates from healthy, diseased, and treated UCD mice.
• Application of univariate and multivariate data processing techniques, including partial least-squares analysis.
• Comparison of metabolic feature detection and analyte trend analysis between microflow and analytical flow methods.

Main Results:

• Microflow methods demonstrated comparable performance to analytical flow ion-pairing methods in separating sample groups.
• Similar numbers of metabolic features were detected in negative ionization mode by both approaches.
• Analyte trends and coverage of known UCD biomarkers were consistent across both evaluated methods.

Conclusions:

• Ion-pair free microflow separations are a viable alternative to traditional ion-pairing methods in metabolomics.
• The 12.5-fold reduction in sample injection volume highlights the utility of microflow methods for sample-limited studies.
• These findings support the application of microflow metabolomics for disease biomarker analysis.