Modern separation techniques coupled to high performance mass spectrometry for glycolipid analysis

Area of Science:

• Analytical Chemistry
• Biochemistry
• Glycomics

Background:

• Glycolipids (GLs) play crucial roles in biological functions and various pathologies, including viral infections, neurodegeneration, and cancer.
• Accurate structural analysis of GLs is essential for understanding their roles but presents significant challenges due to their complexity and low abundance in biological matrices.

Purpose of the Study:

• To review and critically assess modern separation techniques coupled with mass spectrometry (MS) for the structural investigation of glycolipids.
• To highlight the advantages, applications, and limitations of both non-liquid and liquid-based separation methods for glycolipidomics.

Main Methods:

• Non-liquid phase separation: Thin Layer Chromatography (TLC) for MS analysis and Ion Mobility Spectrometry (IMS) for high-resolution separation, isomer discrimination, and analysis of minor species.
• Liquid-based separation: High-Performance Liquid Chromatography (HPLC) and Hydrophilic Interaction Liquid Chromatography (HILIC) coupled directly or indirectly to MS for glycolipidomics.
• Electrophoretic separation: Capillary Electrophoresis (CE) coupled on- and off-line with MS, evaluated for its separation efficiency and applicability.

Main Results:

• IMS offers high reproducibility, enables the detection of minor GL species, requires minimal sample amounts, and provides conformational separation with isomer discrimination.
• HPLC and HILIC are versatile liquid-phase techniques for broad glycolipidomics surveys when coupled with MS.
• CE-MS demonstrates remarkable separation efficiency for GLs, with both on- and off-line configurations offering distinct technical and application benefits.

Conclusions:

• A combination of advanced separation techniques, including TLC, IMS, HPLC, HILIC, and CE, coupled with MS, provides powerful tools for comprehensive glycolipid structural analysis.
• These integrated approaches are crucial for advancing our understanding of GL roles in health and disease, paving the way for new diagnostic and therapeutic strategies.