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Microstructural, Fluid Dynamic, and Mechanical Characterization of Zinc Oxide and Magnesium Chloride-Modified
Murilo Daniel de Mello Innocentini1,2, Bruno Ribeiro Fuzatto Bueno1, Agnieszka Urbaś3
1Course of Chemical Engineering, University of Ribeirão Preto, Avenida Costabile Romano 2201, 14096-900 Ribeirão Preto, SP, Brazil.
ACS Biomaterials Science & Engineering
|July 16, 2024
Summary
Researchers developed new biomimetic scaffolds using gelatin/alginate and hydroxyapatite for osteochondral defect regeneration. Additives like ZnO and MgCl2 improved mechanical properties and permeability, showing potential for cartilage repair.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Orthopedic Research
Background:
- Osteochondral defects pose a significant challenge in regenerative medicine.
- Current biomaterial scaffolds often lack the complex properties of natural cartilage.
- There is a need for advanced scaffolds that mimic native tissue structure and function.
Purpose of the Study:
- To develop and characterize novel biomimetic scaffolds for osteochondral defect regeneration.
- To evaluate the impact of different additives (hydrated MgCl2, ZnO, nanohydroxyapatite) on scaffold properties.
- To assess the suitability of these scaffolds for mimicking natural cartilage microarchitecture and mechanical characteristics.
Main Methods:
- Fabrication of gelatin/alginate scaffolds modified with hydroxyapatite using two-stage freeze-drying.
- Incorporation of biologically active additives: hydrated MgCl2, ZnO, and nanohydroxyapatite.
- Assessment of microstructural, elemental, permeability, and mechanical properties using techniques like X-ray microanalysis.
Main Results:
- Scaffolds exhibited interconnected pores with a biomimetic hierarchical microarchitecture (lower surface porosity, higher central porosity).
- Additives influenced pore size and permeability; ZnO scaffolds showed highest permeability (5.92 × 10^-11 m^2), nanohydroxyapatite the lowest (1.18 × 10^-11 m^2).
- ZnO and hydrated MgCl2 additives resulted in the best mechanical parameters, meeting criteria for osteochondral defect filling.
Conclusions:
- The developed composite scaffolds demonstrate biomimetic characteristics in microarchitecture, mechanical properties, and chemical composition.
- These novel scaffolds show significant potential for the regeneration of osteochondral defects.
- The study highlights the successful integration of bioactive additives to enhance scaffold functionality for cartilage repair.
