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Hypsochromic Shift Donor-Acceptor NIR-II Dye for High-Efficiency Tumor Imaging.

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Summary

Researchers developed smaller, reduced π-conjugated donor-acceptor (D-A) dyes for second near-infrared window (NIR-II) imaging. These D-A dyes show excellent performance in blood vessel, lymphatic drainage, and tumor imaging, offering a promising alternative for biomedical applications.

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Area of Science:

  • Biomedical Imaging
  • Organic Chemistry
  • Materials Science

Background:

  • Current second near-infrared window (NIR-II) dyes often have large molecular weights and poor druggability due to extended π conjugation.
  • Reduced π conjugation is typically associated with blueshifted spectra and diminished imaging quality, limiting research in smaller NIR-II dyes.

Purpose of the Study:

  • To investigate the potential of smaller NIR-II dyes with reduced π conjugation systems.
  • To develop novel donor-acceptor (D-A) based NIR-II fluorophores with improved properties for biomedical imaging.

Main Methods:

  • Synthesis of a reduced π conjugation donor-acceptor (D-A) probe, TQ-1006 (Em = 1006 nm).
  • Comparative analysis of TQ-1006 with a donor-acceptor-donor (D-A-D) structure, TQT-1048 (Em = 1048 nm).
  • Evaluation of imaging performance in blood vessels, lymphatic drainage, and tumor models, including RGD-conjugated probes.

Main Results:

  • TQ-1006 demonstrated comparable performance to TQT-1048 in blood vessel and lymphatic drainage imaging.
  • TQ-1006 achieved a higher tumor-to-normal tissue (T/N) ratio compared to TQT-1048.
  • An RGD-conjugated probe (TQ-RGD) achieved high-contrast tumor imaging with a T/N ratio ≥ 10.

Conclusions:

  • The donor-acceptor (D-A) framework is a viable strategy for designing effective small-molecule NIR-II fluorophores.
  • Reduced π conjugation in D-A dyes does not necessarily lead to poor imaging quality and can improve druggability.
  • These findings support the development of next-generation NIR-II dyes for advanced biomedical imaging applications.