(9R)-9-Hydroxystearate-Functionalized Anticancer Ceramics Promote Loading of Silver Nanoparticles

Calcium phosphates are known for their osteoinductive properties in biomedical applications. Researchers have explored ways to enhance these materials with therapeutic agents. Traditional approaches focus on structural integration of drugs or metals. However, the specific combination of anticancer and antimicrobial agents remains underexplored. Prior studies have demonstrated that functionalizing calcium phosphates can improve their biological performance. Yet, the effect of hydroxystearate content on nanoparticle loading is not well established. This gap motivated the investigation of hydroxyapatite nanocrystals functionalized with hydroxystearate. The uncertainty around how hydroxystearate influences AgNP loading led to this study. Understanding these interactions could expand the range of biomedical applications for these materials.

This study aimed to assess the impact of hydroxystearate content on the loading of silver nanoparticles in hydroxyapatite nanocrystals. The researchers sought to determine whether hydroxystearate functionalization enhances AgNP loading capacity. They also wanted to evaluate how this functionalization affects material properties. The motivation stemmed from the need to develop multifunctional biomedical materials. Combining anticancer and antimicrobial properties could improve implant performance. The specific problem addressed was the lack of data on how hydroxystearate content influences AgNP loading. By preparing nanocrystals with different HSA contents, the team aimed to clarify this relationship. Their goal was to establish a reproducible method for functionalizing and loading these nanocrystals.

Hydroxyapatite nanocrystals were functionalized with hydroxystearate at two concentrations: 4 and 9 wt%. The functionalization process occurred in aqueous solution during synthesis. Silver nanoparticle loading was achieved by varying the volume of AgNP suspension added. The team used direct synthesis methods to prepare the nanocrystals. They analyzed structural and morphological properties using standard characterization techniques. Hydrophobic properties were assessed through contact angle measurements. Zeta potential was measured to evaluate surface charge changes. The sustained release of AgNPs was tested in cell culture medium to assess antimicrobial potential.

The highest AgNP loading reached 3.3 wt% when using the highest HSA content and AgNP suspension volume. Hydroxystearate content had a stronger effect on material properties than AgNP loading. Structural and hydrophobic characteristics varied with HSA concentration. Zeta potential increased slightly with AgNP content, but not significantly. AgNPs showed sustained release in cell culture medium, suggesting antimicrobial activity. The nanocrystals retained their structural integrity after functionalization and loading. No significant morphological changes were observed due to AgNP loading. The results suggest that HSA functionalization enhances AgNP loading capacity.

The findings suggest that hydroxystearate functionalization increases AgNP loading in hydroxyapatite nanocrystals. Structural and hydrophobic properties depend more on HSA content than AgNP loading. The team observed sustained AgNP release in cell culture medium. These results support the use of HSA-functionalized nanocrystals for biomedical applications. The study highlights the importance of HSA content in nanoparticle loading. The authors propose that this approach could improve the antimicrobial and anticancer properties of implants. Their findings may guide future work on multifunctional biomedical materials. The results align with the hypothesis that HSA content influences AgNP loading.