Ligand exchange based paraoxon imprınted QCM sensor

Area of Science:

• Analytical Chemistry
• Materials Science
• Sensor Technology

Background:

• Paraoxon detection is crucial for environmental and food safety monitoring.
• Existing detection methods may lack selectivity or sensitivity.
• Molecularly imprinted polymers (MIPs) offer a promising approach for selective analyte recognition.

Purpose of the Study:

• To develop a highly selective and sensitive quartz crystal microbalance (QCM) sensor for paraoxon determination.
• To utilize a novel metal-chelate interaction for creating paraoxon-selective molecular memories.
• To investigate the analytical performance and binding characteristics of the developed MIP-QCM sensor.

Main Methods:

• Fabrication of a paraoxon-imprinted polymer (MIP) film on a QCM electrode.
• Utilizing metal-chelate interaction for creating imprinted sites.
• Characterization of the MIP film using FTIR, AFM, and ellipsometry.
• Evaluation of sensor performance including binding interaction, selectivity, and analytical parameters.

Main Results:

• The MIP-QCM sensor exhibited a low detection limit of 0.06 μM for paraoxon.
• An affinity constant (K(affinity)) of 2.25 × 10(4) M⁻¹ was determined for the paraoxon-MIP complex.
• The sensor demonstrated high selectivity for paraoxon over structurally similar compounds like parathion.

Conclusions:

• The developed paraoxon imprinted QCM sensor effectively combines the selectivity of MIPs with the sensitivity of QCM.
• The novel metal-chelate interaction approach facilitates the creation of robust molecular memories for paraoxon recognition.
• This MIP-QCM sensor shows significant potential for accurate and reliable paraoxon monitoring in various applications.