Engineering the Ratios of Nanoparticles Dispersed in Triphasic Nanocomposites for Biomedical Applications

Area of Science:

• Biomaterials Science
• Nanotechnology
• Polymer Chemistry

Background:

• Polymer/ceramic nanocomposites offer combined properties for biomedical uses, particularly bone tissue repair.
• Achieving uniform dispersion of ceramic nanoparticles in polymer matrices is crucial for performance.

Purpose of the Study:

• To develop and characterize triphasic poly(lactic-co-glycolic acid) (PLGA) nanocomposites with hydroxyapatite (HA) and magnesium oxide (MgO) nanoparticles.
• To investigate the effect of HA/MgO ratios on nanoparticle dispersion, degradation, and cell-material interactions for bone tissue engineering.

Main Methods:

• Fabrication of PLGA/HA/MgO nanocomposites using ultrasonic energy and dual asymmetric centrifugal mixing.
• Microstructural and compositional characterization of nanocomposites.
• Evaluation of degradation behavior and bone marrow stromal cell (BMSC) adhesion under varying HA/MgO ratios.

Main Results:

• Homogeneous nanoparticle distribution and designed elemental composition were achieved in PLGA/HA/MgO nanocomposites.
• Reduced MgO content significantly increased BMSC adhesion density, with the 70:29:1 PLGA:HA:MgO ratio showing the highest adhesion.
• MgO content accelerated nanocomposite degradation, with higher MgO leading to greater mass loss and increased media pH and Mg2+ ion concentration.

Conclusions:

• Triphasic PLGA/HA/MgO nanocomposites exhibit tunable degradation profiles and enhanced cell interactions.
• Optimizing HA/MgO ratios is key to tailoring these nanocomposites for specific bone tissue regeneration requirements.
• Further adjustments are needed when combining these nanoparticles with polymers exhibiting different degradation characteristics.