Efficient modification on PLLA by ozone treatment for biomedical applications

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Tissue Engineering

Background:

• Poly(L-lactic acid) (PLLA) is a widely used biodegradable polymer.
• Enhancing PLLA's surface properties is crucial for biomedical applications.
• Cell adhesion and osteogenesis are key factors for bone regeneration materials.

Purpose of the Study:

• To develop an efficient method for immobilizing Arg-Gly-Asp-Ser (RGDS) peptides onto PLLA surfaces.
• To investigate the role of acryl succinimide (ASI) as an intermediate reactant in enhancing grafting efficiency.
• To evaluate the impact of RGDS-modified PLLA on cell behavior and in vivo biocompatibility.

Main Methods:

• Ozone oxidation of PLLA followed by grafting with ASI.
• Immobilization of RGDS peptide onto the modified PLLA surface.
• Characterization using DPPH assay, elemental analysis, and HPLC.
• In vitro cell culture studies with rat osteosarcoma (ROS) cells.
• In vivo biocompatibility assessment.

Main Results:

• Ozone treatment time effectively controlled peroxide concentration.
• ASI immobilization was confirmed, and RGDS grafting efficiency was significantly improved.
• RGDS-modified PLLA enhanced ROS cell attachment, proliferation, and mineralization.
• In vivo experiments demonstrated the biocompatibility of ASI-modified surfaces.

Conclusions:

• Ozone treatment with ASI is an efficient, controllable, and biocompatible method for PLLA surface modification.
• Immobilized RGDS significantly enhances PLLA's biocompatibility and osteoinductive properties.
• This approach offers a promising strategy for developing advanced bone regeneration materials.