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Resorc[4]arene-Modified Gold-Decorated Magnetic Nanoparticles for Immunosensor Development.
Andrea Calcaterra1, Francesca Polli1, Lara Lamelza1
1Department of Chemistry and Technology of Drugs, Department of Excellence 2018-2022, Sapienza─University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy.
Bioconjugate Chemistry
|February 8, 2023
Summary
Researchers developed a novel supramolecular chemistry platform for highly sensitive electrochemical immunosensors. This method uses a resorcarene macrocycle for oriented antibody immobilization, improving detection of analytes like atrazine.
Area of Science:
- Supramolecular Chemistry
- Nanotechnology
- Electrochemistry
- Biosensors
Background:
- Developing selective, sensitive, and fast-response immunosensors is crucial for analyte monitoring.
- Random antibody immobilization on sensor surfaces limits binding site density and immunoaffinity.
- Supramolecular chemistry offers a tool for preorganizing receptors and enhancing self-assembled monolayers.
Purpose of the Study:
- To develop a sensitive, label-free electrochemical immunosensor using a supramolecular chemistry/nanotechnology platform.
- To achieve oriented antibody immobilization via a resorcarene macrocycle linker.
- To demonstrate the platform's efficacy for detecting atrazine (ATZ).
Main Methods:
- Synthesized a water-soluble, bifunctional resorc[4]arene architecture (RW).
- Anchored RW to gold-coated magnetic nanoparticles (Au@MNPs) to create RW@Au@MNPs.
- Deposited RW@Au@MNPs onto graphite screen printed electrodes for antibody immobilization.
- Utilized differential pulse voltammetry for electrochemical characterization and ATZ analysis.
Main Results:
- The resorcarene-based immunosensor demonstrated improved antibody loading and 1.5x higher sensitivity to ATZ compared to random immobilization.
- Achieved a linearity range of 0.05-1.5 ng/mL for ATZ detection.
- Obtained a low limit of detection (0.011 ng/mL) with good reproducibility and stability.
- Analyzed spiked water samples with high recovery rates (95.7-108.4%).
Conclusions:
- The developed supramolecular chemistry platform successfully enables oriented antibody immobilization for enhanced electrochemical immunosensor performance.
- The resorcarene-based strategy significantly improves sensitivity and simplifies antibody immobilization procedures.
- This approach holds promise for sensitive screening and monitoring of analytes like ATZ in real-world samples.
