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Fluorogenic Linkage Integration for Nonfluorescent Transformations (FLINT).

Bishal Pokhrel1, Fatiha Farhana1, Li Zuo1

  • 1Department of Chemistry and Biochemistry, Kent State University, Kent, Ohio 44242, United States.

Chemical & Biomedical Imaging
|May 2, 2025
PubMed
Summary
This summary is machine-generated.

The Fluorogenic Linkage Integration for Nonfluorescent Transformation (FLINT) approach enables single-molecule imaging of nonfluorogenic reactions. This method tracks previously invisible catalytic processes, advancing chemical kinetics and catalysis research.

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Area of Science:

  • Chemical Kinetics
  • Single-Molecule Imaging
  • Catalysis

Background:

  • Single-molecule optical imaging typically requires fluorogenic reactions.
  • Nonfluorogenic reactions are challenging to study at the single-molecule level.
  • Existing methods limit the scope of observable catalytic processes.

Purpose of the Study:

  • To develop a novel imaging method for nonfluorogenic reactions at the single-molecule level.
  • To overcome the limitations of fluorogenic probes in single-molecule catalysis studies.
  • To enable high-resolution kinetic analysis of previously unobservable reactions.

Main Methods:

  • Developed the Fluorogenic Linkage Integration for Nonfluorescent Transformation (FLINT) approach.
  • Utilized a cascading reaction: nonfluorogenic glucose oxidation coupled with fluorogenic Amplex Red to resorufin transformation.
  • Employed single-molecule turnover time analysis, cyclic voltammetry, and fluorescence spectroscopy.

Main Results:

  • Successfully monitored single-turnover events and extracted kinetic parameters for nonfluorogenic glucose oxidation.
  • Demonstrated FLINT's ability to distinguish reaction kinetics of coupled steps.
  • Validated FLINT by comparing catalytic performances of gold nanoparticles, gold nanorods, and coronazymes.
  • Evaluated chiral selectivity of d- and l-glucose on coronazymes.

Conclusions:

  • FLINT is a powerful technique for single-molecule imaging of nonfluorogenic reactions.
  • The approach provides high spatiotemporal resolution for kinetic analysis.
  • FLINT has potential applications in studying enantioselective reactions and advancing catalysis research.