Breakthrough in Food Safety: Gold Nanoparticles Detect Hazardous Pesticides with High Accuracy

Strategic Insights -

Scientists at the National Research Council have developed a cutting-edge technology using hydrogel-based flexible plasmonic devices to monitor food safety, particularly for pesticide detection. This innovative method employs gold nanoparticles and surface-enhanced Raman scattering (SERS) to detect dimethoate, a hazardous organophosphorus pesticide, at concentrations below the maximum residue limit (MRL) of 0.01 ppm on olives. The research demonstrates an impressive detection limit of 3 parts-per-billion (ppb) with a signal enhancement of 10.

Key Takeaways:

  • The researchers integrated surface-enhanced Raman scattering (SERS) with gold nanoparticles (AuNPs) embedded in polyethylene glycol diacrylate (PEGDA) hydrogels to achieve detection at parts-per-billion (ppb) levels.
  • The hydrogel matrix enhances sensitivity and reproducibility by forming AuNP dimers, whose concentration increases with dimethoate levels, boosting signal output.
  • The system uses UV polymerization of a pre-polymer solution, enabling direct application onto olive surfaces and achieving a detection limit of 3 ppb with a signal enhancement of 10.
  • The method has been validated on-site with a portable Raman spectrometer and demonstrated excellent selectivity for dimethoate, offering a practical solution for food safety.
  • The research has implications for detecting sulfur-containing pesticides, providing a practical solution for food safety.
  • The study has been peer-reviewed and published in Food Chemistry, a leading journal in the field.
  • The research team, led by Bruno Miranda, consisted of Deniz Yilmaz, Valeria Nocerino, Alessandro Esposito, Ilaria Rea, Enza Lonardo, Luca De Stefano, and Anna Chiara De Luca.

Statistics:

  • Detection limits: 3 parts-per-billion (ppb) with a signal enhancement of 10.
  • Signal enhancement: 10 times higher than conventional methods.
  • Maximum residue limit (MRL) for dimethoate: 0.01 ppm on olives.
  • Timeframe for detection: Real-time monitoring of food safety.

Sources:

  • "Engineering gold nanoparticles aggregation in acrylate hydrogel-photopolymers for SERS-based on-site highly sensitive dimethoate detection on olives". Food Chemistry, 2025; 493: 145890.
  • VerticalNews. "Current study results on Nanotechnology - Gold Nanoparticles have been published". Food Weekly News, September 18, 2025; p 278.
  • NewsRx. "Studies Conducted at National Research Council on Gold Nanoparticles Recently Reported (Engineering gold nanoparticles aggregation in acrylate hydrogel-photopolymers for SERS-based on-site highly sensitive dimethoate detection on olives)". Food Weekly News, September 18, 2025; p 278.