[Biomimetic nanohydroxyapatite/gelatin composite material preparation and in vitro study]

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Nanotechnology

Background:

• Bone tissue engineering requires scaffolds that mimic the natural bone extracellular matrix.
• Hydroxyapatite (HA) and gelatin are key components for creating such biomimetic materials.
• Developing scaffolds with controlled porosity and mechanical strength is crucial for successful bone regeneration.

Purpose of the Study:

• To synthesize and characterize a novel 3D porous scaffold composed of nano-hydroxyapatite (nHA) and gelatin.
• To evaluate the physical, chemical, and mechanical properties of the nHA/gelatin scaffold.
• To assess the biocompatibility and osteogenic potential of the scaffold using mouse osteoblasts.

Main Methods:

• A freeze-drying technique was employed to fabricate the 3D porous nHA/gelatin composite scaffold.
• Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and universal testing machine were used for material characterization.
• In vitro studies involved culturing mouse osteoblasts on the scaffold, assessing cell adhesion, morphology, viability (MTT assay), and alkaline phosphatase (ALP) activity.

Main Results:

• SEM revealed a 3D interconnected porous structure with pore sizes between 150-400 μm.
• FTIR confirmed strong chemical bonding between the nHA and gelatin phases.
• The scaffold exhibited a compressive strength of 3.28 ± 0.51 MPa, high porosity (80.6 ± 4.1%), good biocompatibility, and promoted osteoblast proliferation and ALP activity.

Conclusions:

• The freeze-drying method successfully produced nHA/gelatin porous scaffolds with desirable 3D structure and high porosity.
• The developed scaffold demonstrates excellent biocompatibility with mouse osteoblasts.
• This nHA/gelatin composite scaffold represents a promising novel material for bone tissue engineering applications.