Synchronous dual-mode sensing platform based on 1D chiral ionic COF for epoxiconazole detection

Area of Science:

• Materials Science
• Analytical Chemistry
• Environmental Science

Background:

• Pesticide misuse poses significant risks to environmental health and food safety.
• Developing sensitive and rapid detection methods for pesticide residues is crucial.

Purpose of the Study:

• To develop a dual-mode sensor for simultaneous electrochemiluminescence (ECL) and differential pulse voltammetry (DPV) detection of pesticide residues.
• To utilize a 1D ionic covalent organic framework (COF) for enhanced sensing capabilities.

Main Methods:

• Synthesis of a 1D ionic COF ((R)-PTCDA-RMP) via polycondensation of PTCDA and RMP building blocks.
• Implementation of pulsed voltage for synchronized ECL and DPV signal generation.
• Testing the sensor's response to epoxiconazole (EPC) in orange fruit samples.

Main Results:

• The COF-based sensor exhibited excellent linear responses to epoxiconazole (EPC) concentrations.
• Achieved low limits of detection (LODs): 0.189 μg L⁻¹ (ECL) and 5.15 μg L⁻¹ (DPV).
• Demonstrated high accuracy with satisfactory recoveries (95.3-103.8%) in real food samples.

Conclusions:

• The developed dual-mode sensor provides a robust and rapid method for pesticide residue surveillance.
• This technology has significant potential for application in food safety analysis and environmental monitoring.
• The use of COFs offers a promising platform for advanced chemical sensing applications.