Selective and sensitive molecularly imprinted polymer-based electrochemical sensor for detection of deltamethrin

Area of Science:

• Electrochemistry
• Materials Science
• Analytical Chemistry
• Sensor Technology

Background:

• Electrochemical sensors are crucial for industrial applications, offering sensitivity, speed, and cost-effectiveness in monitoring critical parameters.
• These sensors are vital in food safety, environmental monitoring, and pharmaceutical production for detecting contaminants and ensuring product quality.
• Existing electrochemical sensors often lack the ability for simultaneous qualitative and quantitative analysis, limiting their ease of use and commercial potential.

Purpose of the Study:

• To develop a highly sensitive and selective electrochemical sensor for detecting the pesticide deltamethrin.
• To integrate molecularly imprinted polymer (MIP) technology with electrochromic materials for dual qualitative and quantitative analysis.
• To create a cost-effective and user-friendly sensor system for pesticide detection, reducing reliance on complex instrumentation.

Main Methods:

• Fabrication of the sensor involved electrodeposition of cobalt oxide (Co3O4) onto indium tin oxide (ITO) electrodes.
• Electropolymerization of o-phenylenediamine was performed using deltamethrin as a template molecule to create the molecularly imprinted polymer (MIP).
• Template molecules were removed using methanol, and the sensor's performance was evaluated through electrochemical measurements.

Main Results:

• The developed MIP-based electrochemical sensor demonstrated high sensitivity and selectivity for deltamethrin detection.
• Optimized sensor achieved low limits of detection (LOD): 1.53 nM and 0.34 μM in the respective linear ranges for the MIP electrode.
• The sensor exhibited electrochromic properties, allowing for visual color change detection correlated with deltamethrin concentration, enabling qualitative assessment.

Conclusions:

• The novel electrochromic pesticide sensor, based on MIPs and Co3O4, successfully enables both target-specific and visual pesticide identification.
• This dual-mode detection capability offers significant advantages over traditional electrochemical MIP sensors, providing both qualitative and quantitative results.
• The enhanced ease of use and potential for reduced instrumentation needs position this sensor as a promising, commercially viable product for pesticide monitoring.