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Development and evaluation of cross-linked collagen-hydroxyapatite scaffolds for tissue engineering
Niladri Nath Panda1, Sriramakamal Jonnalagadda, Krishna Pramanik
1a Department of Biotechnology and Medical Engineering , National Institute of Technology , Rourkela , 769008 , Odisha , India .
Journal of Biomaterials Science. Polymer Edition
|August 3, 2013
Summary
This study developed cross-linked collagen/hydroxyapatite (HAp) scaffolds for tissue engineering. The collagen:HAp ratio of 1:2 showed promising results for cell growth and mechanical strength, indicating potential for further development.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Regenerative Medicine
Background:
- Type I collagen is a primary component of the extracellular matrix.
- Hydroxyapatite (HAp) is a key mineral component of bone.
- Developing effective scaffolds is crucial for tissue regeneration.
Purpose of the Study:
- To investigate the tissue engineering potential of type I collagen cross-linked with hydroxyapatite (HAp).
- To evaluate the properties and biocompatibility of collagen:HAp composite scaffolds.
Main Methods:
- Scaffolds were fabricated using controlled freezing and lyophilization of collagen and HAp mixtures.
- Cross-linking was performed using glutaraldehyde.
- Characterization included microstructure analysis, mechanical testing, swelling studies, degradation assays, hemocompatibility, cytocompatibility, and in vivo implantation in rats.
Main Results:
- Collagen:HAp scaffolds exhibited smaller pore sizes (10-40 μm) compared to pure collagen (50-100 μm).
- Mechanical strength increased significantly with higher HAp content, nearly doubling for the 1:6 ratio.
- Cross-linking with HAp did not alter collagen structure.
- Mesenchymal stem cells showed healthy growth on collagen:HAp composites (1:2 ratio).
- In vivo studies revealed an initial inflammatory response followed by macrophage-mediated chronic inflammation.
Conclusions:
- Cross-linked collagen/HAp composite scaffolds demonstrate potential for tissue engineering applications.
- The collagen:HAp ratio of 1:2 is identified as optimal for further development due to balanced properties and cytocompatibility.
