Molecular level interactions in brushite-aminoacids composites.

Area of Science:

• Biomaterials Science
• Materials Chemistry
• Biomineralization

Background:

• Brushite-based bone cements are crucial in orthopedic applications.
• Understanding the interaction between organic additives and inorganic bone cement matrices is essential for developing advanced biomaterials.

Purpose of the Study:

• To investigate the molecular-level interactions between amino acids (Glycine, Proline, Lysine) and brushite bone cements.
• To elucidate the effects of these interactions on the properties of the composite materials.

Main Methods:

• Fourier-transform infrared (FTIR) spectroscopy
• Thermogravimetry (TG)
• Scanning Electron Microscopy (SEM)
• Mechanical properties testing

Main Results:

• Brushite phase was predominantly maintained with amino acid addition.
• FTIR and TG data indicated both bulk and specifically interacting Glycine within the matrix, with coordination to Ca ions.
• Heating revealed condensation products (cyclic products, dipeptides) from Glycine.
• Proline and Lysine showed weaker, non-specific hydrogen bonding interactions with brushite.

Conclusions:

• Glycine's specific coordination with Ca ions in brushite acts as a retardant, enhancing cement workability.
• The findings provide insights into designing functionalized bone cements with tailored properties.