Polydopamine-Coated Poly-Lactic Acid Aerogels as Scaffolds for Tissue Engineering Applications

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Tissue Engineering

Background:

• Poly-L-lactic acid (PLLA) is a biodegradable polyester widely used in biomedical applications.
• Developing advanced scaffolds with tunable properties is crucial for effective tissue regeneration.
• Aerogels offer unique porous structures suitable for cell infiltration and tissue growth.

Purpose of the Study:

• To synthesize novel PLLA aerogel scaffolds using different solvents (cyclopentanone and methyl benzoate).
• To investigate the influence of solvent choice on aerogel microstructure, mechanical properties, and in vitro biocompatibility.
• To enhance the biocompatibility of PLLA aerogels through surface modification with polydopamine (PDA).

Main Methods:

• Preparation of PLLA aerogels via solvent extraction using supercritical CO2.
• Characterization of aerogel porosity and morphology using Scanning Electron Microscopy (SEM).
• Assessment of mechanical compressive strength and in vitro cell viability.
• Surface functionalization of aerogels with polydopamine (PDA) via dopamine (DA) polymerization.

Main Results:

• PLLA aerogels synthesized with cyclopentanone (PLLA/CPO) exhibited higher mechanical compressive strength and more homogeneous porosity compared to those prepared with methyl benzoate (PLLA/BzOMe).
• The crystalline forms (α' and ε) in the gel nodes influenced the pore structure and properties of the resulting aerogels.
• PLLA/CPO aerogels demonstrated superior in vitro cell viability.
• PDA coating significantly improved the biocompatibility of PLLA/CPO aerogels.

Conclusions:

• Solvent selection critically impacts the structural and mechanical properties of PLLA aerogels.
• PLLA/CPO aerogels, particularly when coated with PDA, represent promising biodegradable scaffolds for tissue engineering.
• The combination of PLLA's biodegradability and PDA's biomimetic interface offers tunable properties for advanced regenerative medicine applications.