Lithium Hydroxide Hydrolysis Combined with MALDI TOF Mass Spectrometry for Rapid Sphingolipid Detection

Area of Science:

• Lipidomics
• Mass Spectrometry
• Biochemistry

Background:

• Sphingolipids are crucial for biological processes but challenging to analyze due to low abundance and complex structures.
• Existing mass spectrometry methods face limitations in sensitivity and specificity for comprehensive sphingolipid detection.

Purpose of the Study:

• To develop a robust and high-throughput method for sphingolipid analysis.
• To enhance the detection of low-abundance sphingolipids, particularly ceramides.
• To improve mass spectrometry-based sphingolipid analysis through lithium adduct consolidation.

Main Methods:

• Utilized lithium hydroxide in hydrolysis to remove suppressants and introduce lithium ions.
• Employed an optimized MALDI matrix (THAP) for lithium adduct consolidation.
• Developed a workflow combining MALDI TOF with lithium adduct consolidation for sphingolipid detection.

Main Results:

• Achieved decreased spectral complexity and increased signal intensity for sphingolipids.
• Successfully detected differentially expressed liver sphingolipids in a high-fat diet mouse model.
• Demonstrated effective sphingolipid detection in brain and plasma matrices, validated by UHPLC HR MS/MS and MALDI FT-ICR.

Conclusions:

• The developed workflow offers a robust and high-throughput approach for sphingolipid analysis across diverse biological matrices.
• Lithium adduct consolidation significantly enhances sphingolipid detection sensitivity and specificity.
• This method provides a valuable tool for investigating sphingolipid profiles in health and disease states.