Surface modified nano-hydroxyapatite/poly(lactide acid) composite and its osteocyte compatibility.

Area of Science:

• Biomaterials Science
• Nanotechnology
• Polymer Science

Background:

• Poly(lactic acid) (PLA) is a biodegradable polymer with potential in tissue engineering.
• Hydroxyapatite (HA) nanoparticles are osteoconductive but often exhibit poor dispersion in polymer matrices.
• Improving the interfacial interaction between PLA and HA is crucial for enhanced composite properties.

Purpose of the Study:

• To fabricate and characterize poly(lactic acid)/hydroxyapatite (PLA/HA) nanocomposites using surface-modified HA nanoparticles (mHA).
• To evaluate the dispersibility, interfacial interactions, and cytocompatibility of the developed nanocomposites.
• To assess the potential of mHA/PLA nanocomposites for bone tissue engineering applications.

Main Methods:

• Melt blending technique for nanocomposite fabrication.
• Surface modification of HA nanoparticles using dodecyl alcohol via esterification.
• Characterization using field emission scanning electron microscopy (FESEM), rheology analysis, and dynamic mechanical thermal analysis (DMTA).
• In vitro assessment of cartilage cell attachment, spreading, and proliferation.

Main Results:

• Surface modification significantly improved HA nanoparticle dispersibility in the PLA matrix.
• Enhanced interfacial interactions were observed between PLA and mHA nanoparticles.
• mHA/PLA nanocomposite films exhibited superior cartilage cell attachment, spreading, and proliferation compared to PLA and unmodified HA/PLA.
• Good cytocompatibility was attributed to improved dispersion, interfacial adhesion, and balanced hydrophobicity/hydrophilicity.

Conclusions:

• Surface-modified HA nanoparticles effectively enhance PLA-based nanocomposites.
• The developed mHA/PLA nanocomposites demonstrate excellent cytocompatibility and cell growth properties.
• These novel nanocomposites show significant promise for future bone tissue engineering applications.