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Published on: October 29, 2013
Functional groups affect physical and biological properties of dextran-based hydrogels
Guoming Sun1, Yu-I Shen, Chia Chi Ho
1Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Journal of Biomedical Materials Research. Part A
|September 16, 2009
Summary
Modifying dextran with functional groups creates unique hydrogels for tissue engineering. Amine-functionalized dextran hydrogels show superior biocompatibility and controlled release properties for biomedical applications.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Tissue Engineering
Background:
- Dextran modification enables tailored hydrogel properties for biomedical applications.
- Developing functionalized dextran-based hydrogels is crucial for advanced tissue-engineered scaffolds.
- Hybrid hydrogels integrating dextran and polyethylene glycol diacrylate (PEGDA) offer tunable characteristics.
Purpose of the Study:
- To synthesize and characterize dextran-based macromers with diverse functional groups (amine, allyl isocyanate, chloroacetic acid, maleic anhydride).
- To investigate the impact of varying dextran/PEGDA ratios on hybrid hydrogel properties.
- To evaluate the physical, mechanical, and biological performance of functionalized dextran hydrogels for tissue engineering.
Main Methods:
- Synthesis of dextran macromers functionalized with allyl isocyanate (Dex-AI), ethylamine (Dex-AE), chloroacetic acid (Dex-AC), and maleic anhydride (Dex-AM).
- Fabrication of biodegradable hybrid hydrogels by integrating functionalized dextran with PEGDA at low, medium, and high ratios (20/80, 40/60, 60/40).
- Comprehensive characterization including swelling, degradation, mechanical testing, crosslinking density, in vitro/in vivo biocompatibility, and vascular endothelial growth factor release studies.
Main Results:
- Hydrogel properties such as swelling, degradation rate, mechanics, and crosslinking density varied significantly based on the incorporated functional groups and Dex/PEGDA ratios.
- In vitro and in vivo biocompatibility assessments demonstrated favorable outcomes for the developed hydrogels.
- Hydrogels incorporating amine groups (Dex-AE) exhibited enhanced biocompatibility and improved release profiles for therapeutic factors.
Conclusions:
- The incorporation of specific functional groups into the dextran backbone fundamentally alters the properties of the resulting hydrogel network.
- Amine functionalization of dextran leads to hydrogels with superior biocompatibility and controlled release capabilities.
- These findings highlight the potential of amine-functionalized dextran-based hydrogels for advanced biomedical applications, particularly in tissue engineering scaffolds.
