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Synthesis of Thermogelling Poly(N-isopropylacrylamide)-graft-chondroitin Sulfate Composites with Alginate Microparticles for Tissue Engineering
Published on: October 26, 2016
Preparation and characterization of an injectable composite
Rongwei Tan1, Xufeng Niu, Shaolei Gan
1Department of Materials Science and Engineering, Tsinghua University, Beijing, China.
Journal of Materials Science. Materials in Medicine
|March 10, 2009
Summary
A novel injectable gel composite for bone repair was developed. This material shows tunable properties and good in vitro degradation, making it promising for bone tissue engineering applications.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Materials Engineering
Background:
- Hydrogels offer minimally invasive delivery and in situ gelation for medical applications.
- Injectable hydrogels are crucial for bone repair and tissue engineering.
Purpose of the Study:
- To develop and characterize a novel injectable, in situ-forming gel composite (GC) for bone repair.
- To assess the rheological, mechanical, and in vitro degradation properties of the GC.
- To elucidate the gelation mechanism of the composite material.
Main Methods:
- Formulation of a gel composite (GC) using calcium alginate hydrogel and nano-hydroxyapatite/collagen (nHAC).
- Evaluation of injectability, rheological behavior (pre-gel, sol-gel, post-gel phases), and mechanical properties (compressive and shear modulus).
- In vitro degradation studies over 28 days, assessing weight changes and surface morphology.
Main Results:
- The GC demonstrated tunable injectability, with controllable initial and final setting times.
- Rheological analysis revealed distinct gelation phases.
- Mechanical properties showed compressive elastic modulus (E) of 17.0-56.0 kPa and shear modulus (G) of 24.7-55.0 kPa.
- In vitro degradation showed initial weight gain followed by loss, with structural integrity maintained for 28 days.
Conclusions:
- The developed gel composite exhibits desirable tunable properties for injectable bone repair applications.
- The material demonstrates suitable mechanical stability and controlled degradation profiles.
- This injectable GC holds significant potential as a biomaterial for bone repair and tissue engineering.
