Preparation of hydroxyapatite from animal bones

Area of Science:

• Biomaterials Science
• Materials Chemistry
• Biotechnology

Background:

• Hydroxyapatite (HAp) is a key biomaterial with applications in bone regeneration and dentistry.
• Utilizing animal bones as a source for HAp offers a sustainable and cost-effective approach.
• Characterization of HAp derived from biological sources is crucial for understanding its properties.

Purpose of the Study:

• To develop and present a method for obtaining hydroxyapatite from animal bones.
• To comprehensively characterize the synthesized hydroxyapatite and assess its purity and composition.
• To evaluate the physical properties, such as surface area and pore volume, of the derived hydroxyapatite.

Main Methods:

• Bone sludge and calcined products were analyzed using X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM).
• Calcium and phosphorus content were quantified via titration and spectrophotometry, respectively.
• Microelemental analysis was performed using Atomic Absorption Spectroscopy (AAS) and Inductively Coupled Plasma (ICP) methods. Specific surface area was measured using the Brunauer–Emmett–Teller (BET) method.

Main Results:

• X-ray diffraction confirmed hydroxyapatite as the sole crystalline phase in all analyzed products.
• Fourier transformed infrared spectroscopy indicated complete removal of organic substances after calcination.
• The Ca/P molar ratio was determined to be approximately 1.62 (38% Ca, 18% P), consistent with nonstoichiometric hydroxyapatite.

Conclusions:

• A viable method for producing hydroxyapatite from animal bones has been established.
• The derived hydroxyapatite is pure and possesses characteristics suitable for biomaterial applications.
• Further research can explore the optimization of pore structure and microelemental composition for specific uses.