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Cellulose Surface Nanoengineering for Visualizing Food Safety.

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Summary

This study introduces nanowrinkled cellulose/Ag nanoparticle membranes for highly sensitive food safety testing. These membranes detect trace pesticides, revealing they penetrate fruit peels, highlighting the need for peeling to reduce ingestion risks.

Keywords:
Raman imagingaligned nanostructurecellulose membranefood safetynanoengineering

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Food Science

Background:

  • Food safety relies on sensitive, non-destructive detection methods for harmful substances.
  • Current methods may lack sensitivity or convenience for real-time food analysis.

Purpose of the Study:

  • To develop a novel, flexible, and transparent membrane for enhanced trace pesticide detection in food.
  • To investigate the penetration depth of pesticides into fruit tissues.

Main Methods:

  • Fabrication of nanowrinkled cellulose/Ag nanoparticle membranes (NWCM-Ag) via cellulose dissolution, regeneration, and in situ nanoparticle synthesis.
  • Utilizing the NWCM-Ag for surface-enhanced Raman scattering (SERS) to detect trace pesticides.
  • Employing Raman imaging to visualize pesticide distribution in apple peel and pulp.

Main Results:

  • NWCM-Ag membranes demonstrated a 2.3 × 10^8 enhancement factor for SERS detection.
  • Pesticides were detected within the apple pulp layer up to approximately 30 μm deep.
  • Raman imaging confirmed pesticide penetration beyond the fruit peel.

Conclusions:

  • The developed NWCM-Ag membranes offer a highly sensitive platform for food safety analysis.
  • Simple washing is insufficient to remove pesticides; peeling is necessary.
  • This work expands cellulose applications in food safety and nanowrinkled structure design.