Maximizing MS/MS Acquisition for Lipidomics Using Capillary Separation and Orbitrap Tribrid Mass Spectrometer

Area of Science:

• Analytical Chemistry
• Biochemistry
• Mass Spectrometry

Background:

• Liquid chromatography-mass spectrometry (LC-MS) is a standard technique for lipidomics.
• Capillary LC-MS, common in proteomics, has seen limited use in lipidomics.
• Existing methods face challenges in comprehensive lipid identification and quantification.

Purpose of the Study:

• To improve lipid identification in a single LC-MS analysis.
• To enhance sensitivity and speed for complex lipid mixtures.
• To establish a more efficient capillary LC-MS workflow for lipidomics.

Main Methods:

• Utilized capillary LC coupled with nanoelectrospray for enhanced ionization.
• Employed an ion trap for high-sensitivity tandem mass spectrometry (MS/MS).
• Implemented parallel mass analyzer acquisition on an Orbitrap hybrid system for increased speed.

Main Results:

• Successfully identified and quantified over 1500 lipids in human plasma.
• Achieved comprehensive lipid profiling within a 60-minute capillary LC-MS analysis.
• Demonstrated a significant improvement in lipid identification capabilities.

Conclusions:

• The developed 3-fold approach significantly enhances lipidomics analysis via capillary LC-MS.
• This method offers improved sensitivity, speed, and identification depth for complex lipid samples.
• The workflow is effective for analyzing lipid mixtures like human plasma.