Porous calcium silicate bioactive material-alginate composite for bone regeneration

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Materials Chemistry

Background:

• Bone tissue engineering seeks solutions for bone defects caused by trauma, infection, tumors, and surgery.
• Polymer and bioactive material (BM) composites are promising for bone repair, but polymers often lack sufficient bioactivity.
• Optimizing composite scaffolds is crucial for enhancing bone regeneration and clinical applicability.

Purpose of the Study:

• To develop and characterize a novel bioactive material-sodium alginate (BM-Alg) composite scaffold.
• To optimize the porous structure of the composite by varying the sodium alginate content.
• To evaluate the in vitro and in vivo biocompatibility and angiogenic potential of the BM-Alg scaffold.

Main Methods:

• Bioactive material (BM) synthesized from rice husk and eggshell precursors.
• BM-Alg composite scaffolds prepared via a facile cross-linking approach.
• Characterization using XRD, FTIR, SEM, BET; in vitro bioactivity in simulated body fluid (SBF); haemolysis, angiogenesis (ex ovo CAM model), and MG-63 cell cytotoxicity assays; in vivo biocompatibility assessment.

Main Results:

• BM-Alg composite scaffolds exhibited optimized porous structures.
• In vitro studies confirmed hydroxyapatite formation in SBF, indicating bioactivity.
• Low haemolysis (<5%) and enhanced neovascularization in the CAM model were observed.
• MG-63 cell studies and in vivo tests demonstrated excellent biocompatibility and non-toxicity.

Conclusions:

• The developed BM-Alg composite scaffold is a promising biomaterial for bone tissue engineering.
• The scaffold demonstrates favorable bioactivity, biocompatibility, and angiogenic properties.
• This composite offers a potential solution for addressing bone defects and promoting bone regeneration.