A versatile method to separate complex lipid mixtures using 1-butanol as eluent in a reverse-phase UHPLC-ESI-MS...

Area of Science:

• Analytical Chemistry
• Lipidomics
• Biochemistry

Background:

• Rapid assessment of cellular lipidomes is crucial for biological research.
• Existing liquid chromatography-mass spectrometry (LC-MS) methods face challenges in separating highly hydrophobic lipids.

Purpose of the Study:

• To develop a versatile reversed-phase ultra-high-performance liquid chromatography-mass spectrometry (RP-UHPLC-MS) method for enhanced lipid separation.
• To specifically address the separation of highly hydrophobic lipids using 1-butanol as an eluent.

Main Methods:

• Development of a novel RP-UHPLC-MS method utilizing 1-butanol as a mobile phase component.
• Separation of glycerophospholipid standards and phospholipids with varying acyl chain compositions.
• Application of the method to analyze lipid extracts from Escherichia coli and Sulfolobus acidocaldarius.

Main Results:

• The 1-butanol-based method successfully separated diverse lipid classes, including cardiolipins, tetraether lipids, and mycolic acids.
• This method demonstrated superior elution of highly hydrophobic analytes compared to 2-propanol-based systems.
• Enhanced separation of cardiolipins and an extended analytical range for RPLC were achieved.

Conclusions:

• The developed 1-butanol-based RP-UHPLC-MS method offers a robust and versatile approach for comprehensive lipidome analysis.
• This technique significantly improves the separation of challenging, highly hydrophobic lipids, advancing lipidomic studies in various organisms.