Elimination of LC-MS/MS matrix effect due to phospholipids using specific solid-phase extraction elution conditions

Area of Science:

• Analytical Chemistry
• Biochemistry

Background:

• Phospholipids in plasma extracts contribute to matrix effects in Liquid Chromatography-Mass Spectrometry (LC-MS).
• Reducing phospholipid levels is crucial for accurate bioanalytical measurements.

Purpose of the Study:

• To identify optimal elution conditions for solid-phase extraction (SPE) to minimize phospholipid interference.
• To evaluate different SPE chemistries for their effectiveness in phospholipid removal.

Main Methods:

• Investigated reversed-phase SPE using silica-based and polymer-based cartridges.
• Varied eluent compositions, specifically methanol and acetonitrile concentrations.
• Assessed phospholipid recovery and elution profiles.

Main Results:

• Decreasing methanol content in eluents reduced phospholipid recovery on both silica and polymer SPE cartridges.
• 100% acetonitrile drastically minimized phospholipid elution from silica-based cartridges.
• Silanol interactions explained increased phospholipid retention with high acetonitrile concentrations on silica.
• Successful extraction recovery of pharmaceutical compounds validated the findings.

Conclusions:

• Specific combinations of eluents and reversed-phase SPE cartridges effectively mitigate matrix effects caused by phospholipids.
• Optimized SPE protocols enhance the reliability of LC-MS bioanalysis.