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Related Experiment Video

Updated: Jan 19, 2026

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A Plasmonic Approach to Study Protein Interaction Kinetics through the Dimerization of Functionalized Ag

Pablo A Mercadal1, Ruben D Motrich2, Eduardo A Coronado3

  • 1INFIQC-CONICET, Centro Láser de Ciencias Moleculares, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina.

Scientific Reports
|September 13, 2019
PubMed
Summary

This study introduces a new plasmonic method using silver nanoparticles (Ag NPs) to track protein-ligand binding kinetics. This approach aids in developing sensitive diagnostic tools for disease monitoring and biomarker detection.

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Area of Science:

  • Biochemistry and Biophysics
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Protein-ligand interactions are crucial in biological systems.
  • Accurate kinetic studies are vital for developing diagnostic and analytical methods.
  • Existing methods may have limitations in sensitivity or scope.

Purpose of the Study:

  • To develop a novel plasmonic assay for studying protein-ligand binding kinetics.
  • To utilize silver nanoparticles (Ag NPs) as probes for antigen detection.
  • To elucidate the complex reaction mechanisms governing Ag NP dimerization.

Main Methods:

  • Formation of silver nanoparticle (Ag NP) dimers via UV-Vis spectroscopy.
  • Functionalization of Ag NPs with streptavidin (STV).
  • Induction of dimerization using biotinylated antibodies (IgG-Biot).
  • Systematic kinetic analysis as a function of Ag NP size and antibody concentration.

Main Results:

  • Demonstrated a novel plasmonic approach for kinetic analysis of protein-ligand interactions.
  • Successfully studied the biotin-streptavidin (Biot-STV) interaction kinetics.
  • Identified a complex reaction mechanism involving specific binding site interactions for dimerization.
  • Showcased the potential of functionalized Ag NPs as probes for biomarker detection.

Conclusions:

  • The developed plasmonic method provides a sensitive platform for studying biomolecular interactions.
  • The findings contribute to understanding the kinetics of Ag NP dimerization.
  • This approach can be adapted for surface plasmon resonance-based bioassays for detecting various analytes.