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Fully physically crosslinked pectin-based hydrogel with high stretchability and toughness for biomedical application.

Xiaojun Wu1, Hong Sun2, Zhihui Qin1

  • 1School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China.

International Journal of Biological Macromolecules
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Summary

This study developed a tough hydrogel using pectin and a poly(acrylamide-co-stearyl methacrylate) network. The novel double physical crosslinking (DPC) hydrogel shows excellent mechanical properties and supports cell growth for tissue repair.

Keywords:
BiocompatibilityCell scaffoldDual physical crosslinkHigh mechanical strengthPectin

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Tissue Engineering

Background:

  • Natural polymer hydrogels face limitations in biomedical applications due to brittleness and poor stability.
  • Developing robust and stable hydrogels is crucial for advanced biomedical uses.

Purpose of the Study:

  • To create a tough and stable double physical crosslinking (DPC) hydrogel using pectin and poly(acrylamide-co-stearyl methacrylate) (P(AAm-co-SMA)).
  • To evaluate the mechanical properties and biocompatibility of the novel hydrogel for tissue engineering applications.

Main Methods:

  • A three-step method was used to prepare the pectin-Fe3+/P(AAm-co-SMA) DPC hydrogel.
  • The hydrogel network comprised a poly(acrylamide) (PAAm) network formed by hydrophobic associations and a pectin-Fe3+ network.
  • Mechanical properties were tuned by adjusting the ratio of pectin and PAAm networks.

Main Results:

  • The DPC hydrogel exhibited excellent toughness (1.04-11.20 MJ m⁻³).
  • Tunable mechanical properties were achieved, including tensile strength (0.97-1.61 MPa), elongation (133-1346%), and elastic modulus (0.30-2.20 MPa).
  • The hydrogel supported adhesion and proliferation of ATDC5 chondrocytes, with cells penetrating the hydrogel structure.

Conclusions:

  • The developed pectin-Fe3+/PAAm DPC hydrogels demonstrate superior toughness and tunable mechanical properties.
  • The hydrogels show significant potential for load-bearing tissue repair applications due to their biocompatibility and ability to support cell infiltration.