Smart Net-Zero

Foods | April 4, 2023

Researchers from Wuhan Polytechnic University in China, in collaboration with others, have developed a new method for detecting fenitrothion (FT), a harmful organophosphate pesticide, in environmental and food samples. Organophosphate pesticide abuse poses serious threats to human health, causing significant harm and even fatalities to millions of people annually.

The team designed a non-enzymatic electrochemical sensor using a combination of hydrothermally synthesized titanium-based metal-organic frameworks (MOFs) material (NH₂-MIL-125(Ti)) and reduced graphene oxide (RGO) nanocomposites. This sensor enables better enrichment of the target FT molecules and efficient electron transfer. Differential pulse voltammetry was used to analyze the sensor's response.

Under optimized conditions, the sensor demonstrated a linear detection range of 0.072–18 μM for FT, with a detection limit of 0.0338 μM. The sensor also exhibited excellent stability and reproducibility. Furthermore, it effectively detected FT in spiked agricultural products, making it a valuable tool for pesticide residue analysis.

This study introduces a convenient fabrication method using NH₂-MIL-125(Ti)/RGO nanocomposites, presenting a promising approach for the development of non-enzymatic detection methods for pesticides. The sensor's reliability and sensitivity contribute to efforts in monitoring and ensuring food safety and environmental protection.

Schematic diagram of materials, NH2−MIL−125(Ti)/ RGO/GCE preparation process, and detection mechanism.