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Dual-mode flexible surface-enhanced Raman spectroscopy-based smart tape for thiram and thiabendazole detection.

Nan Wang1, Jing Wang2, Hongfei Liu3

  • 1Key Laboratory of OptoElectronic Science and Technology for Medicine, Ministry of Education, Fujian Provincial Key Laboratory for Photonics Technology, Fujian Normal University, Fuzhou, 350117, China. lujvip@126.com.

Analytical Methods : Advancing Methods and Applications
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Summary

A new SERS-based tape detects pesticide residues like thiram and thiabendazole (TBZ) with high sensitivity. This flexible, paper-based platform offers rapid, on-site food safety analysis for fruits and juices.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Food Science

Background:

  • Pesticide residues in food pose significant risks to public health and food safety.
  • Existing detection methods often lack the speed and on-site capabilities required for real-time monitoring.
  • Development of sensitive and portable analytical tools is crucial for effective agricultural product safety assessment.

Purpose of the Study:

  • To develop a flexible, paper-based surface-enhanced Raman spectroscopy (SERS)-based tape for rapid on-site detection of pesticide residues.
  • To achieve high sensitivity and reliability in pesticide detection, addressing limitations of current methods.
  • To create a versatile platform for analyzing both solid and liquid food samples.

Main Methods:

  • Fabrication of a SERS-based tape using a three-phase liquid interface self-assembly approach.
  • Integration of a paper substrate with uniformly deposited silver nanoparticles (AgNPs) and adhesive tape.
  • Utilizing portable Raman spectrometers for analysis in 'paste-and-peel' and direct-drop modes.

Main Results:

  • The SERS tape demonstrated high sensitivity for detecting thiram and thiabendazole (TBZ).
  • Achieved detection limits were significantly lower than national maximum residue limits (MRLs).
  • Pre-immobilization of AgNPs on the paper matrix prevented nanoparticle detachment, enhancing reliability.

Conclusions:

  • The developed SERS tape is a reliable tool for on-site monitoring of agricultural product safety.
  • The platform offers a promising solution for rapid food safety applications, particularly for pesticide residue analysis.
  • The flexible and user-friendly design facilitates non-destructive sampling and analysis of various food matrices.