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Guest-matrix interactions affect the solvation of cyclodextrin-based polymeric hydrogels: a UV Raman scattering

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  • 1Elettra - Sincrotrone Trieste, Strada Statale 14 km 163.5, Area Science Park, 34149 Trieste, Italy. barbara.rossi@elettra.eu and Department of Physics, University of Trento and INSTM Local Unit, via Sommarive 14, 38123 Povo, Trento, Italy.

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Caffeine loading in cyclodextrin nanosponges alters hydrogel molecular properties. This molecular insight aids in designing strategies for controlled release of bioactive molecules from hydrogel networks.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Physical Chemistry

Background:

  • Polysaccharide hydrogels are versatile materials with tunable properties.
  • Non-covalent interactions play a crucial role in modifying hydrogel behavior during guest molecule loading.
  • Understanding these interactions is key for applications like drug delivery.

Purpose of the Study:

  • To investigate molecular property modifications in polysaccharide hydrogels upon guest compound loading.
  • To explore the role of non-covalent interactions in caffeine-loaded cyclodextrin nanosponges.
  • To elucidate the impact of caffeine on hydrogel network structure and solvation.

Main Methods:

  • UV Raman scattering experiments were employed to analyze hydrogels.
  • Experiments were conducted varying temperature, caffeine concentration, and pH.
  • Analysis focused on vibrational modes and dynamical parameters of the polymer backbone.

Main Results:

  • Caffeine loading induced structural rearrangements in the hydrogel's hydrophobic/hydrophilic groups.
  • Specific guest-matrix interactions were observed to form and break.
  • Caffeine loading increased water solvent access to hydrophobic regions, enhancing overall system solvation.

Conclusions:

  • UV Raman scattering provides molecular insights into hydrogel behavior during guest loading.
  • The study offers a molecular picture of caffeine's effect on cyclodextrin nanosponges.
  • Findings support the development of strategies for controlled diffusion and release of bioactive molecules from hydrogels.