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Sizing Down a Supramolecular Gel into Micro- and Nanoparticles.

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Summary

Low molecular weight gelators form fluorescent nanoparticles in water. These novel nanocarriers can encapsulate dyes and deliver them into cancer cells, offering a potential alternative to polymeric nanogels in nanomedicine.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Low molecular weight gelators (LMWGs) are molecules that can self-assemble into three-dimensional networks in various solvents.
  • Fluorescent molecules, such as 1,8-naphthalimide derivatives, are often incorporated into LMWGs for sensing or imaging applications.
  • The formation of nanostructures from LMWGs in aqueous media is of interest for biomedical applications.

Purpose of the Study:

  • To investigate the formation of micro- and nanoparticles from a fluorescent 1,8-naphthalimide-based low molecular weight gelator in aqueous media.
  • To characterize the self-assembled nanostructures and evaluate their potential for drug delivery applications.
  • To assess the modulation of dye properties and cellular uptake facilitated by these nanocarriers.

Main Methods:

  • Synthesis of a fluorescent 1,8-naphthalimide-based low molecular weight gelator.
  • Controlled self-assembly in aqueous media by varying gelator concentration.
  • Characterization using dynamic light scattering (DLS), electron microscopy (SEM/TEM), and fluorescence spectroscopy.
  • Encapsulation studies with Rose Bengal and Rhodamine 123.
  • In vitro cellular uptake studies in human lung carcinoma cells.

Main Results:

  • The gelator self-assembled into fibrillar networks, microparticles, or nanoparticles depending on concentration.
  • The formed micro- and nanoparticles successfully encapsulated Rose Bengal and Rhodamine 123.
  • Rose Bengal's singlet oxygen generation was modulated upon encapsulation.
  • Rhodamine 123 delivery into human lung carcinoma cells was enhanced by the nanoparticles.
  • The nanoparticles demonstrated potential for intracellular transport.

Conclusions:

  • Fluorescent low molecular weight gelators can form tunable nanostructures in water.
  • These self-assembled nanoparticles show promise as novel nanocarriers for drug delivery.
  • They offer a potential alternative to traditional polymeric nanogels in nanomedicine.
  • The study highlights the versatility of LMWGs in creating functional nanomaterials for biomedical applications.