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Development of a Polymer Ultrasound Contrast Agent Incorporating Nested Carbon Nanodots.

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Summary

This study integrates fluorescent graphene quantum dots (GQDs) into polylactic acid microbubbles, enhancing their imaging and theranostic potential. Aminated GQDs offer superior fluorescence and ultrasound imaging capabilities for advanced theranostics.

Keywords:
carbon nanodotgraphene quantum dotmicrobubblestheranosticultrasound contrast agents

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Nanotechnology

Background:

  • Polymer microbubbles (MBs) are promising theranostic agents.
  • Enhancing MBs' imaging and functional versatility is crucial for theranostics.
  • Integrating fluorescent nanoparticles can improve MB capabilities.

Purpose of the Study:

  • To investigate the integration of fluorescent graphene quantum dots (GQDs) into polylactic acid (PLA) microbubbles.
  • To characterize the physical, optical, and acoustic properties of GQD-loaded PLA MBs.
  • To evaluate the potential of GQD-PLA MBs as enhanced theranostic agents.

Main Methods:

  • Synthesis of unmodified, carboxylated, and aminated GQD-loaded PLA MBs via double emulsion.
  • Characterization using AccuSizer, Zetasizer, SEM, fluorescence microscopy/fluorimetry, and acoustic setup.
  • Evaluation of acoustic performance with clinical ultrasound and inertial cavitation susceptibility.

Main Results:

  • GQD-PLA MBs ranged from 1.4–2.02 µm; aminated GQD MBs showed the greatest zeta potential shift.
  • Aminated GQD MBs exhibited superior fluorescence detection (DAPI/TRITC filters).
  • Carboxylated GQD MBs had the highest loading efficiency (59.4%), while all MBs maintained ultrasound contrast properties.

Conclusions:

  • Aminated GQD-PLA MBs demonstrate enhanced fluorescence and imaging capabilities for theranostics.
  • GQD integration did not compromise essential microbubble properties, including ultrasound contrast.
  • These GQD-PLA MBs show significant promise for advancing theranostic applications, with future work exploring drug co-loading.