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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
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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.

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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.