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Fluorescent Bioactive Corrole Grafted-Chitosan Films.

Joana F B Barata, Ricardo J B Pinto, Vanda I R C Vaz Serra1

  • 1Centro Química Estrutural, Complexo I, Instituto Superior Técnico , 1049-001 Lisboa, Portugal.

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Chemically modified chitosan films with corrole macrocycles exhibit fluorescence and antibacterial properties. These novel corrole-chitosan films show potential for biosensors and bioactive optical devices.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomaterials

Background:

  • Chitosan is a biocompatible and biodegradable polysaccharide with versatile applications.
  • Corrole macrocycles are known for their unique photophysical and electronic properties.
  • Developing functionalized chitosan materials is crucial for advanced applications.

Purpose of the Study:

  • To synthesize and characterize transparent corrole-grafted-chitosan films.
  • To investigate the impact of corrole grafting on film properties, including fluorescence and thermal stability.
  • To evaluate the antibacterial activity and potential applications of the developed films.

Main Methods:

  • Chemical modification of chitosan using 5,10,15-tris(pentafluorophenyl)corrole (TPFC).
  • Solvent casting technique for film preparation.
  • Characterization using UV-vis spectroscopy, FLIM, FTIR, XPS, TGA, and DMA.
  • Antibacterial activity testing against S. aureus.

Main Results:

  • Successful grafting of corrole units onto chitosan without compromising film-forming ability.
  • Increased grafting yield with extended reaction time.
  • Transparent films exhibiting fluorescence that correlates with the amount of grafted corrole.
  • Demonstrated bacteriostatic effect against S. aureus.
  • Good thermomechanical properties and thermal stability.

Conclusions:

  • Corrole-grafted-chitosan films are successfully prepared with enhanced properties.
  • The films possess fluorescence, antibacterial activity, and favorable thermal and mechanical characteristics.
  • These materials show significant promise for applications in biosensors, bioimaging, and bioactive optical devices.