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Self-assembled nanoparticles based on cyclodextrin-modified pullulan: Synthesis, and structural characterization

Jakob Stensgaard Diget1, Reidar Lund1, Bo Nyström1

  • 1Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315, Oslo, Norway.

Carbohydrate Polymers
|March 19, 2019
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Summary
This summary is machine-generated.

Novel host-guest functionalized polymers were synthesized and characterized. These polymers self-assembled into sub-100 nm nanoparticles, demonstrating tunable properties based on molecular structure and host-guest ratio.

Keywords:
"Click" chemistryHost-guest chemistryPullulanSelf-assemblySmall-angle X-ray scattering (SAXS)β-Cyclodextrin (βCD)

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Area of Science:

  • Polymer Chemistry
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • Host-guest chemistry enables the design of functional materials through specific molecular recognition.
  • Click chemistry provides an efficient method for polymer functionalization.
  • Polymer nanoparticles offer versatile platforms for various applications.

Purpose of the Study:

  • To synthesize novel host-guest functionalized polymers using click chemistry.
  • To create and characterize nanoparticles self-assembled from these polymers.
  • To investigate the influence of molecular structure and host-guest ratio on nanoparticle properties.

Main Methods:

  • Copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) for polymer functionalization.
  • Nuclear magnetic resonance (NMR) spectroscopy and gel filtration chromatography (GFC) for polymer characterization.
  • Small-angle X-ray scattering (SAXS) and dynamic light scattering (DLS) for nanoparticle characterization.
  • Isothermal titration calorimetry (ITC) to study host-guest interactions.

Main Results:

  • Successfully synthesized β-cyclodextrin (βCD)-pullulan and adamantane-dextran conjugates via CuAAC click reaction.
  • Self-assembly of these polymers yielded spherical nanoparticles in the sub-100 nm range.
  • SAXS and DLS confirmed nanoparticle formation and size.
  • Host-guest ratio and molecular structure significantly impacted particle size, size distribution, porosity, and aggregation stability.

Conclusions:

  • Demonstrated the successful synthesis of host-guest functionalized polymers.
  • Established a method for creating well-defined nanoparticles through host-guest self-assembly.
  • Highlighted the critical role of molecular design in controlling nanoparticle characteristics for potential applications.