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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Pharmaceutical Chemistry

Background:

  • Ionizable cyclodextrins are increasingly important in host-guest chemistry and pharmaceuticals due to electrostatic interactions.
  • These cyclodextrins enhance solubility and complex stability with oppositely charged guests.
  • Aggregation induced by charged cyclodextrins is an underreported phenomenon.

Purpose of the Study:

  • To synthesize carboxyl-modified cyclodextrins using click chemistry and hydrolysis.
  • To investigate the aggregation behavior of cationic guest molecules induced by these modified cyclodextrins.
  • To explore the potential of induced supramolecular nanoparticles for drug encapsulation and controlled release.

Main Methods:

  • Synthesis of carboxyl-modified cyclodextrins.
  • UV-vis spectroscopy to study aggregation.
  • Dynamic Light Scattering (DLS), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Transmission Electron Microscopy (TEM), and NMR spectroscopy for characterization.
  • Complexation studies with amantadine.

Main Results:

  • Hepta-carboxyl-β-cyclodextrin selectively induced self-assembly of cationic guests into spherical nanoparticles.
  • Stable inclusion complexes were formed between hepta-carboxyl-β-cyclodextrin and amantadine.
  • The nanoparticles demonstrated potential for encapsulating model drugs and achieving controlled release.

Conclusions:

  • Molecular-induced aggregation using modified cyclodextrins is a viable strategy for nanoparticle formation.
  • Hepta-carboxyl-β-cyclodextrin is effective in forming supramolecular nanoparticles with cationic guests.
  • The amantadine-cyclodextrin complex within nanoparticles shows promise for pharmaceutical applications, particularly in controlled drug delivery.