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Molecularly imprinted polymers combined with membrane-protected solid-phase extraction to detect triazines in tea

Tianyu Zhou1, Qi Zhao1, Li Zhao1

  • 1College of Chemistry, Jilin University, Changchun, Jilin, 130012, China.

Analytical and Bioanalytical Chemistry
|June 27, 2018
PubMed
Summary

This study developed a novel membrane-protected solid-phase extraction method using molecularly imprinted polymers (MIPs) for efficient triazine detection in tea. The method offers high sensitivity and accuracy for analyzing these pesticides in complex food matrices.

Keywords:
Emulsion polymerizationMembrane protectionMolecularly imprinted polymerSolid-phase extractionTeaTriazines

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Area of Science:

  • Polymer Chemistry
  • Analytical Chemistry
  • Environmental Science

Background:

  • Triazines are widely used herbicides that can contaminate food and water sources.
  • Accurate and sensitive detection methods are crucial for food safety and environmental monitoring.
  • Existing methods for triazine extraction can be complex and time-consuming.

Purpose of the Study:

  • To develop a novel, efficient, and sensitive method for the direct extraction and determination of triazines in tea extracts.
  • To create molecularly imprinted polymers (MIPs) with high specificity for triazine detection.
  • To optimize a membrane-protected solid-phase extraction (SPE) technique for triazine enrichment.

Main Methods:

  • Spherical molecularly imprinted polymers (MIPs) were synthesized via emulsion polymerization.
  • MIPs were encapsulated in polypropylene microporous membranes to create MIP adsorption packages.
  • Extraction conditions were optimized for direct extraction of triazines from tea samples.
  • High-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) was used for detection.

Main Results:

  • The MIPs demonstrated excellent specific recognition for atrazine and its analogues.
  • Optimized membrane-protected MIP SPE achieved efficient triazine extraction from tea.
  • The method showed excellent linearity (R² ≥ 0.9992) from 0.5 to 250 ng g⁻¹.
  • Low detection limits (0.09–0.18 ng g⁻¹) and good recoveries (81–104%) were achieved.
  • The method was successfully applied to analyze triazines in real tea samples.

Conclusions:

  • The developed membrane-protected MIP SPE method is highly effective for triazine enrichment in complex samples like tea.
  • This technique offers a sensitive, selective, and robust approach for pesticide residue analysis.
  • The method holds promise for widespread application in food safety and environmental monitoring.