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Preparation of Chitosan-based Injectable Hydrogels and Its Application in 3D Cell Culture
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Tunable functional hydrogels formed from a versatile water-soluble chitosan.

Congming Xiao1, Rongrui You1, Ying Fan1

  • 1College of Material Science and Engineering of Huaqiao University, Quanzhou 362021, China.

International Journal of Biological Macromolecules
|January 17, 2016
PubMed
Summary

Water-soluble chitosan (WSC) was used to create functional hydrogels. These magnetic beads and heavy metal adsorbents show tunable properties and high capacities for various compounds.

Keywords:
FormationFunctionHydrogelTunableWater-soluble chitosan

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Environmental Science

Background:

  • Chitosan is a versatile biopolymer with potential applications in functional materials.
  • Developing controllable hydrogels for adsorption and separation remains a key challenge.

Purpose of the Study:

  • To synthesize and characterize two types of functional hydrogels using water-soluble chitosan (WSC).
  • To investigate the magnetic properties and adsorption capabilities of WSC-based magnetic beads.
  • To evaluate the mechanical strength, thermal stability, and heavy metal adsorption of WSC-based hydrogels.

Main Methods:

  • Preparation of magnetic beads via physical cross-linking of WSC with sodium alginate, ferrous chloride soaking, and self-oxidation.
  • Tunable synthesis of magnetic beads by adjusting ferrous ion concentration.
  • Radical cross-linking of WSC with a polyvinyl alcohol-derived macromonomer (PVAM) to form functional hydrogels.
  • Characterization using dynamic mechanical thermal analysis (DMTA) and thermogravimetric analysis (TGA).

Main Results:

  • Magnetic properties of WSC/sodium alginate beads were tunable by ferrous ion concentration.
  • Adsorption capacities of magnetic beads: 1 mg/g for coomassie brilliant blue, 0.5 mg/g for rhodamine, and 2.3 mg/g for hemoglobin.
  • Mechanical strength and thermal stability of WSC/PVAM hydrogels depended on PVAM structure.
  • WSC/PVAM hydrogels exhibited high adsorption capacities for heavy metals: 20.3 mg/g for Cu(2+) and 60.1 mg/g for Pb(2+).

Conclusions:

  • Water-soluble chitosan can be effectively used to construct tunable magnetic beads and functional hydrogels.
  • The developed materials demonstrate promising adsorption capabilities for dyes, proteins, and heavy metal ions.
  • The structural properties of the macromonomer significantly influence the performance of the resulting hydrogels.