Process optimization for the rapid conversion of calcite into hydroxyapatite microspheres for chromatographic...

Area of Science:

• Materials Science
• Biomaterials Engineering
• Chemical Engineering

Background:

• Microsphere hydroxyapatite (HAp) is crucial for biomedical and chromatographic uses.
• Conventional HAp preparation methods are often costly, time-consuming, and yield polydisperse particles.

Purpose of the Study:

• To develop an inexpensive and rapid dissolution precipitation method for HAp microsphere production.
• To optimize reaction parameters for HAp microsphere synthesis.
• To evaluate the suitability of synthesized HAp microspheres for protein chromatography.

Main Methods:

• Direct conversion of calcium carbonate (calcite) particles to HAp microspheres via dissolution precipitation.
• Systematic study of reaction temperature, time, and mechanical stirring rates.
• Characterization using X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM).

Main Results:

• Optimized conditions achieved complete HAp conversion, avoiding calcite residues.
• Reaction parameters significantly influenced microsphere surface microstructure.
• Higher stirring rates led to HAp microsphere disintegration, indicating optimal stirring is crucial.
• Synthesized HAp microspheres demonstrated effectiveness as matrices for protein separation.

Conclusions:

• The developed dissolution precipitation method offers an efficient route to HAp microspheres.
• Optimized reaction parameters are key for producing high-quality HAp microspheres.
• The synthesized HAp microspheres are viable for chromatographic applications, particularly protein mixture separation.