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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

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Automated System for Single Molecule Fluorescence Measurements of Surface-immobilized Biomolecules
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Mitigating unwanted photophysical processes for improved single-molecule fluorescence imaging.

Richa Dave1, Daniel S Terry, James B Munro

  • 1Tri-Institutional Program in Chemical Biology, Weill-Cornell Medical College of Cornell University, New York, New York, USA.

Biophysical Journal
|March 18, 2009
PubMed
Summary
This summary is machine-generated.

Researchers found that specific compounds like cyclooctatetraene and Trolox can reduce blinking and photobleaching in organic fluorophores. This improves fluorescence imaging performance, especially for single-molecule fluorescence resonance energy transfer (smFRET).

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Area of Science:

  • Biophysics
  • Chemical Biology
  • Molecular Imaging

Background:

  • Organic fluorophores are crucial for fluorescence imaging but suffer from photophysical limitations like blinking and photobleaching.
  • These limitations hinder advanced applications such as single-molecule fluorescence and fluorescence resonance energy transfer (FRET) imaging, where stable signals are essential.

Purpose of the Study:

  • To investigate the impact of small-molecule solution additives on the photophysical properties of organic fluorophores.
  • To identify compounds that can mitigate blinking and photobleaching, thereby enhancing fluorescence imaging performance.

Main Methods:

  • Fluorescence and FRET-based assays were performed on dye-labeled DNA and RNA systems.
  • Dwell time analysis was used to study the fluorescence and FRET trajectories of over 200,000 individual molecules.
  • The effects of various small-molecule additives, including known triplet state quenchers, were quantified.

Main Results:

  • Cyclooctatetraene, Trolox, and 4-nitrobenzyl alcohol were found to reduce blinking and photobleaching in a concentration-dependent manner.
  • These compounds also influenced the rate of photoresurrection, improving overall fluorescence stability.
  • A specific combination of compounds proved optimal for imaging performance in both DNA and RNA systems.

Conclusions:

  • Small-molecule additives can significantly improve the photophysical properties of organic fluorophores for fluorescence imaging.
  • Single-molecule FRET (smFRET) imaging is a powerful tool for discovering and optimizing compounds to enhance dye performance.
  • These findings facilitate the development of tailored solutions for specific experimental demands in molecular imaging.