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Sol-gel-based molecularly imprinted xerogel for capillary microextraction.

Habib Bagheri1, Hamed Piri-Moghadam

  • 1Environmental and Bio-Analytical Laboratories, Department of Chemistry, Sharif University of Technology, Tehran, Iran. bagheri@sharif.edu

Analytical and Bioanalytical Chemistry
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Summary

A novel molecularly imprinted xerogel (MIX) selectively extracts triazine herbicides with high efficiency, offering a stable and cost-effective solution for environmental monitoring. This method significantly improves upon non-imprinted materials.

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Area of Science:

  • Materials Science: Development of novel organically modified silica (ORMOSIL) based molecularly imprinted xerogel (MIX).
  • Analytical Chemistry: Application of MIX for on-line capillary microextraction (CME) coupled with high-performance liquid chromatography (HPLC).

Background:

  • Triazine herbicides pose environmental concerns, necessitating selective and efficient extraction methods.
  • Existing extraction techniques may lack selectivity or stability for complex matrices.

Purpose of the Study:

  • To develop a highly selective and stable molecularly imprinted xerogel (MIX) for triazine herbicide extraction.
  • To couple the MIX-based CME with HPLC for sensitive and reliable analysis of triazines in water samples.

Main Methods:

  • Synthesis of MIX using a single precursor, 3-(trimethoxysilyl)propylmethacrylate (TMSPMA), with atrazine as the template molecule.
  • Preparation of a non-imprinted xerogel (NIX) for comparative analysis of extraction efficiency.
  • On-line capillary microextraction (CME) followed by HPLC analysis of triazines (atrazine, ametryn, terbutryn) and other compounds.

Main Results:

  • The MIX exhibited significantly higher extraction efficiency for triazines compared to NIX (10x for atrazine, 8x for ametryn and terbutryn).
  • High selectivity towards triazines was demonstrated, with lower extraction ratios for other compound classes (dicamba, mecoprop, estriol).
  • The developed method showed good linearity (5-700 μg L⁻¹), low detection limits (1-5 μg L⁻¹), and high recovery rates (92-104%) in real water samples.

Conclusions:

  • The novel ORMOSIL-based MIX is a highly selective and stable material for efficient triazine extraction via CME-HPLC.
  • The developed method offers a cost-effective, rapid, and robust approach for environmental monitoring of triazine herbicides.
  • The long lifetime of the CME loop (over 100 runs) highlights the material's stability and practical applicability.