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Self-Reporting Conjugated Polymer Nanoparticles for Superoxide Generation and Detection.

Anna L Clayborn1, Jaclyn A Rebstock1, Lauren J Camardella1

  • 1Department of Chemistry, William & Mary, Williamsburg, Virginia 23187-8795, United States.

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Summary

Conjugated polymer nanoparticles (CPNs) generate superoxide upon irradiation, which can be detected using a doped hydrocyanine dye. This method offers amplified fluorescence detection and insights into CPN applications and limitations.

Keywords:
conjugated polymer nanoparticleselectron transferenergy transferfluorescencesemiconducting polymer dotssuperoxide

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Photochemistry

Background:

  • Conjugated polymer nanoparticles (CPNs) are popular fluorophores for multimodal imaging and phototherapy.
  • CPN applications often focus on singlet oxygen generation, but superoxide formation can degrade fluorescence.

Purpose of the Study:

  • To demonstrate that poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt-co-(1,4-benzo-{2,1',3}-thiadiazole)] (PFBT) CPNs generate superoxide upon irradiation.
  • To develop a CPN-based method for detecting superoxide using a hydrocyanine dye.

Main Methods:

  • Irradiation of PFBT CPNs to induce superoxide generation.
  • Doping PFBT CPNs with a superoxide-responsive hydrocyanine dye.
  • Monitoring fluorescence changes via fluorescence resonance energy transfer (FRET) upon superoxide interaction.

Main Results:

  • PFBT CPNs generate superoxide upon irradiation.
  • Superoxide induces an "off-to-on" fluorescence switch by converting quenching hydrocyanine dyes to fluorescent FRET acceptors.
  • Amplified FRET signals up to 50-100 times greater than direct excitation were observed.
  • Dye loading influences superoxide generation rate and the extent of fluorescence change.

Conclusions:

  • CPNs can be utilized to deliver superoxide for specific applications.
  • This study provides a caution for fluorescence-based CPN applications due to potential fluorophore damage by superoxide.
  • The developed method offers highly sensitive superoxide detection using CPNs.