Bone-like hydroxyapatite precipitated from 10×SBF-like solution by microwave irradiation

Area of Science:

• Biomaterials Science
• Materials Chemistry
• Biomineralization

Background:

• Microwave-assisted methods offer advantages like speed, efficiency, and reduced side reactions in chemical processes.
• Hydroxyapatite (HA) is a key component of bone, making its biomimetic synthesis crucial for bone tissue engineering.
• Conventional methods for HA synthesis can be time-consuming and may not always yield desired properties.

Purpose of the Study:

• To produce bone-like hydroxyapatite (HA) using microwave irradiation via a biomimetic process.
• To investigate the effect of different microwave powers and exposure times on HA precipitation from a simulated body fluid (SBF) solution.
• To determine the optimal conditions for synthesizing HA with properties comparable to cortical bone.

Main Methods:

• Precipitation of HA from a concentrated simulated body fluid (10×SBF-like) solution.
• Application of microwave irradiation at various power levels (90W, 360W, 600W, 1200W) and exposure times.
• Comparative precipitation at room temperature (6h) and 80°C (1h) for control experiments.
• Characterization of obtained HA structures using instrumental techniques.

Main Results:

• The optimal condition for HA production was determined to be microwave-induced precipitation at 600W for 9 cycles of 30s exposure.
• This optimized condition yielded B-type HA with 9.22% (wt.) carbonate content, a Ca/P molar ratio of 1.61, and an amorphous structure.
• The synthesized HA exhibited properties similar to those of cortical bone, achieved rapidly and efficiently.

Conclusions:

• Microwave-assisted precipitation is a highly effective and rapid method for producing bone-like hydroxyapatite from SBF solution.
• The study successfully demonstrated the first-time use of microwave technology for precipitating HA from SBF.
• The optimized process offers a promising route for synthesizing biomimetic HA with desirable characteristics for biomedical applications.