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An efficient LSPR method to quantitatively detect dimethoate: Development, characterization and evaluation.

Dongxian Li1,2, Yanyan Zhang1,2, Qingqian Guo1,2

  • 1Department of Electrical Engineering, Henan Agricultural University, Zhengzhou, China.

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|September 24, 2020
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A new dual-channel Localized Surface Plasmon Resonance (LSPR) system offers rapid detection of the organophosphate insecticide dimethoate in fruits. This method provides a reliable and sensitive approach for monitoring pesticide contamination in agricultural products.

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Area of Science:

  • Analytical Chemistry
  • Nanotechnology
  • Agricultural Science

Background:

  • Growing consumer concern over pesticide residues in fruits necessitates advanced detection methods.
  • Existing quantitative techniques for organophosphate pesticides (OPPs) like dimethoate lack the speed required for rapid field analysis.
  • Development of sensitive and efficient detection systems for food safety is a priority.

Purpose of the Study:

  • To investigate a dual-channel Localized Surface Plasmon Resonance (LSPR) system for the rapid detection of dimethoate.
  • To assess the performance of gold nanoparticles (AuNPs) in detecting dimethoate through absorption variations.
  • To establish a foundation for high-throughput analysis of insecticides in agricultural settings.

Main Methods:

  • Utilized a dual-channel LSPR system employing gold nanoparticles (AuNPs).
  • Optimized conditions to measure absorbance ratios (A(520)/A(640)) correlated with dimethoate concentration.
  • Validated the system by testing dimethoate in real apple samples.

Main Results:

  • Achieved a linear relationship between dimethoate concentration (10-100 nM) and absorbance ratios.
  • Demonstrated high linearity with a correlation coefficient of 0.97 for both channels.
  • Obtained a low limit of detection (LOD) of 5.5 nM and recovery rates between 85.90% and 107.37% in apple samples.

Conclusions:

  • The proposed dual-channel LSPR system provides a rapid, reliable, and sensitive method for detecting dimethoate.
  • This approach offers a novel strategy for monitoring organophosphate insecticides in agricultural fields.
  • The system has the potential for integration with wavelength division multiplexing switches for high-throughput analysis.