Novel Biosensing Strategy for Groundwater and Soil Contamination

Strategic Insights -

Researchers at Guizhou University in China have developed a novel biosensing strategy to address the growing problem of groundwater and soil contamination by the organophosphorus pesticide diazinon (DZN). The strategy combines aptamer molecular recognition with surface-enhanced Raman spectroscopy (SERS) to detect diazinon at ultra-low concentrations. This breakthrough has significant implications for the detection and monitoring of environmental pollutants.

Key Takeaways:

  • The researchers constructed a SERS biosensing interface with single-molecule detection capability using a high-affinity aptamer and a plasmonic resonance-enhanced substrate.
  • The electrochemical surface-enhanced Raman spectroscopy (EC-SERS) method using AgNPs-modified screen-printed electrodes (SPEs) was used for sensitive detection of DZN.
  • The detection limit of the sensor for diazinon was up to 5.33 x 10^-12 M, with a good linear response of the characteristic peaks (602 cm) with the concentration of DZN.
  • The SERS aptasensor was used to detect diazinon in wastewater and subsurface soil with good recoveries (83.20%-117.78%), which were in good agreement with the results obtained by high-performance liquid chromatography.
  • The research demonstrated the sensitivity, stability, and simplicity of operation of the SERS aptasensor, providing a solution for the detection of trace pesticide with ultra-sensitive response and rapid analysis.
  • The study concluded that the SERS aptasensor has strong anti-interference capabilities, making it a powerful tool for environmental monitoring.

Statistics:

  • Detection limit of the sensor for diazinon: 5.33 x 10^-12 M
  • Linear response of the characteristic peaks (602 cm) with the concentration of DZN
  • Good recoveries (83.20%-117.78%)
  • Good agreement with results obtained by high-performance liquid chromatography
  • Sensitivity, stability, and simplicity of operation of the SERS aptasensor

Sources:

  • Construction of a silver nanoparticle SERS aptamer-based sensor and its specific recognition of diazinon. Analytical and Bioanalytical Chemistry, 2025.
  • Guizhou University, Guiyang, 550025, People's Republic of China
  • Springer Heidelberg, Tiergartenstrasse 17, D-69121 Heidelberg, Germany (Publisher: Springer - www.springer.com; Analytical and Bioanalytical Chemistry - www.springerlink.com/content/1618-2642/)
  • NewsRx LLC (Our news journalists report that additional information may be obtained by contacting Qian Liu, Guizhou Key Laboratory of Macrocyclic and Supramolecular Chemistry, Guizhou University)