Magnetic solid-phase extraction of pyrethroid insecticides from tea infusions using ionic liquid-modified magnetic...

Area of Science:

• Analytical Chemistry
• Materials Science
• Environmental Science

Background:

• Pyrethroid pesticides are widely used in agriculture.
• Accurate detection of pyrethroids in food and beverages is crucial for consumer safety.
• Existing analytical methods may require complex sample preparation or lack sensitivity.

Purpose of the Study:

• To develop a simple, sensitive, and reliable magnetic solid-phase extraction (SPE) method for pyrethroid analysis.
• To prepare and characterize a novel magnetic adsorbent for enhanced extraction efficiency.
• To validate the method for determining pyrethroids in tea infusions.

Main Methods:

• Synthesis of ionic liquid-modified magnetic zeolitic imidazolate framework-8 (Fe3O4/ZIF-8/IL) adsorbent.
• Material characterization of the synthesized adsorbent (magnetism, BET surface area, pore volume).
• Optimization of SPE conditions and analysis using Gas Chromatography-Mass Spectrometry/Mass Spectrometry (GC-MS/MS).

Main Results:

• The Fe3O4/ZIF-8/IL adsorbent exhibited high magnetism (59.0 emu g-1), BET surface area (104 m2 g-1), and pore volume (0.68 cm3 g-1).
• Optimized method achieved low limits of determination (0.0065-0.1017 μg L-1) with good precision (RSD ≤11.95%).
• High linearity (R2 > 0.999) and successful application to real tea infusion samples were demonstrated.

Conclusions:

• A novel magnetic adsorbent enables efficient pyrethroid extraction from tea infusions.
• The developed SPE-GC-MS/MS method is simple, sensitive, and reliable for pyrethroid determination.
• This approach offers potential for analyzing other contaminants and developing advanced sample pretreatment techniques.