Comparative study of solid phase extraction techniques for isolation of leukotrienes from plasma

Area of Science:

• Analytical Chemistry
• Biochemistry

Background:

• Leukotrienes are crucial inflammatory mediators.
• Efficient extraction from plasma is vital for accurate analysis.
• Various absorbent materials exist for sample preparation.

Purpose of the Study:

• To compare the efficacy of five commercial absorbent materials for leukotriene extraction from plasma.
• To identify the optimal material for reliable leukotriene analysis.

Main Methods:

• Five absorbent materials (C18 Sep-Pak, C18 J.T. Baker, Amberlite XAD-7, XAD-2, XAD-4) were tested.
• Leukotriene C4 (LTC4) and Leukotriene B4 (LTB4) were spiked into plasma samples.
• Extraction recovery was assessed using different solvent mixtures.

Main Results:

• Amberlite XAD-4 yielded the highest recovery for LTB4 (90%).
• Amberlite XAD-4 and XAD-2 provided identical high recoveries for LTC4 (90%).
• XAD-4 and XAD-2 retained fewer plasma impurities, resulting in cleaner chromatograms compared to C18 materials.

Conclusions:

• Amberlite XAD-4 and XAD-2 are the most effective materials for extracting leukotrienes from plasma.
• These materials offer superior performance over C18-based adsorbents for reversed-phase HPLC analysis.