Direct Oligosaccharide Profiling Using Thin-Layer Chromatography Coupled with Ionic Liquid-Stabilized...

Area of Science:

• Analytical Chemistry
• Glycomics
• Mass Spectrometry

Background:

• Characterizing glycan structures is vital for understanding their roles in health and disease.
• Matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS) faces limitations in analyzing complex carbohydrate mixtures due to poor ionization and separation challenges.

Purpose of the Study:

• To develop a rapid and efficient method for simultaneous separation, detection, and identification of oligosaccharides.
• To overcome the limitations of traditional MALDI MS for complex glycan analysis.

Main Methods:

• Developed an ionic liquid (IL)-stabilized, nanomatrix-decorated thin-layer chromatography (TLC)-MALDI MS method.
• Utilized dihydroxybenzoic acid-functionalized magnetic nanoparticles (DHB@MNPs) for enhanced signal and reproducibility.
• Employed tandem MS for on-spot structural elucidation without chemical derivatization.

Main Results:

• Achieved high reproducibility (<20% CV) and significant signal enhancement (12- and 28-fold).
• Successfully identified 25 oligosaccharides from human milk samples.
• Demonstrated the ability to elucidate glycan composition, sequence, branching, and linkage.

Conclusions:

• The integrated TLC-MALDI MS platform offers a simple and effective approach for rapid oligosaccharide profiling and structural characterization.
• The method provides insights into glycan variability in human milk, potentially related to infant microbiota and immunity.
• This technique is applicable for the rapid screening of diverse oligosaccharide-rich samples.