An ultraperformance liquid chromatography method for the normal-phase separation of lipids

Area of Science:

• Analytical Chemistry
• Biochemistry
• Lipidomics

Background:

• Accurate lipid profiling is crucial for understanding various biological processes and diseases.
• Existing methods for lipid analysis can be time-consuming and may lack comprehensive coverage of lipid classes.

Purpose of the Study:

• To develop and validate a rapid and sensitive ultra-performance liquid chromatography (UPLC) method for the separation and quantitation of major neutral and polar lipids.
• To establish a robust analytical workflow applicable to biological matrices such as plasma and animal tissues.

Main Methods:

• Ultra-performance liquid chromatography (UPLC) utilizing normal-phase solvents and a silica column.
• Evaporative light-scattering detection (ELSD) coupled with a quaternary gradient elution.
• Method validation including limits of quantitation, precision, and retention time variability.

Main Results:

• The UPLC-ELSD method achieved separation of major neutral and polar lipids in under 5 minutes, with a total cycle time of 11 minutes.
• Limits of quantitation were approximately 200 ng on-column, enabling analysis of small sample volumes (20 μL plasma, 50 mg tissue).
• Intraday and interday precision for human plasma lipids ranged from 3.6-10.5% CV, with retention time variability below 6%.

Conclusions:

• The developed UPLC-ELSD method provides a rapid, sensitive, and reproducible approach for comprehensive lipid profiling.
• This method is suitable for analyzing diverse lipid classes in various biological samples, including plasma, liver, and heart tissue.
• The method's efficiency and accuracy support its application in lipidomics research and clinical diagnostics.