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Researchers developed a new method to enhance fluorescent dyes, significantly increasing their Stokes shifts and improving imaging quality. This advancement boosts signal and reduces self-quenching for better biomedical research applications.

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Area of Science:

  • Biomedical Imaging
  • Organic Chemistry
  • Materials Science

Background:

  • Commercially available fluorescent dyes often have small Stokes shifts, leading to poor signal-to-noise ratios and self-quenching.
  • Current microscopy configurations are limited by the properties of existing fluorophores, hindering advanced imaging techniques.

Purpose of the Study:

  • To develop a generalizable method for significantly increasing the Stokes shifts of common fluorophores.
  • To improve the imaging efficiency and photostability of existing commercial dyes.

Main Methods:

  • Appending a 1,4-diethyl-decahydro-quinoxaline (DQ) moiety to the conjugated structure of fluorophores.
  • Evaluating the impact of the DQ moiety on Stokes shift, emission wavelength, and photostability across 11 different fluorophores.

Main Results:

  • The DQ moiety successfully expanded Stokes shifts, emission wavelength, and photostability of 11 fluorophores by over 3-fold.
  • A DQ derivative of hemicyanine showed a 5-fold signal increase in mouse models compared to indocyanine green.
  • DQ-modified fluorophores enabled robust cell behavior studies through one-excitation, multiple emission imaging.

Conclusions:

  • The developed method offers a generalizable approach to enhance the performance of commercial fluorophores.
  • DQ-modified dyes show promise for super-resolution microscopy and second window near-infrared imaging.
  • This technique can significantly improve signal-to-noise ratios and reduce self-quenching in various biomedical imaging applications.