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Polymeric ionic liquids as selective coatings for the extraction of esters using solid-phase microextraction.

Fei Zhao¹, Yunjing Meng, Jared L Anderson

¹Department of Chemistry The University of Toledo 2801 W. Bancroft Street MS 602, Toledo, OH 43606, USA.

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|September 23, 2008

Summary

New polymeric ionic liquid (PIL) coatings for solid-phase microextraction (SPME) offer superior stability and efficiency. These advanced PIL-based SPME fibers demonstrate reliable extraction of esters and fatty acid methyl esters in complex matrices like wine.

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Area of Science:

Analytical Chemistry
Materials Science

Background:

Solid-phase microextraction (SPME) is a widely used technique for sample preparation.
Development of novel stationary phase coatings is crucial for enhancing SPME performance.
Polymeric ionic liquids (PILs) offer unique properties for advanced material applications.

Purpose of the Study:

To introduce a new class of stationary phase coatings for SPME based on polymeric ionic liquids (PILs).
To evaluate the performance of PIL-based SPME coatings in terms of stability, efficiency, and lifetime.
To assess the applicability of PIL-based SPME for extracting esters and fatty acid methyl esters from aqueous and wine matrices.

Main Methods:

Synthesis of three homologous polymeric imidazolium-based ionic liquid coatings via free radical polymerization.
Application of PIL-based fiber coatings for solid-phase microextraction (SPME) of esters and fatty acid methyl esters.
Analysis of extracted analytes using gas chromatography (GC) with flame ionization detection (FID).
Recovery experiments conducted in synthetic wine, red wine, and white wine samples.

Main Results:

PIL-based SPME coatings demonstrated exceptional film stability, high thermal stability, and long lifetimes.
Extraction efficiencies were reproducible, with detection limits for analytes in aqueous solution ranging from 2.5 to 50 µg/L.
Recovery rates in real wine samples (70.2%–115.1%) were comparable or superior to a commercial polydimethylsiloxane fiber (61.9%–102.9%).

Conclusions:

Polymeric ionic liquid-based SPME coatings represent a promising new class of materials for analytical extractions.
These PIL coatings offer enhanced stability and performance compared to conventional SPME fibers.
The tunable structure of PILs allows for the development of task-specific microextraction materials.