Synthesis and Antiplatelet Adhesion Behavior of a Poly(L-lactide-co-glycolide)-Poly(1,5-dioxepan-2-one) Multiblock...

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Medical Device Development

Background:

• Platelet adhesion and denaturation on artificial implants can lead to thrombus formation.
• Developing bioabsorbable materials with antiplatelet properties is crucial for blood-contacting medical applications.

Purpose of the Study:

• To synthesize and evaluate novel bioabsorbable copolymers for their antiplatelet adhesive properties.
• To investigate the potential of poly(l-lactide-co-glycolide)-poly(1,5-dioxepan-2-one) (PLGA-PDXO) copolymers for use in medical implants.

Main Methods:

• Synthesis of poly(l-lactide-co-glycolide)-poly(1,5-dioxepan-2-one) (PLGA-PDXO) multiblock (MBC) and random (RC) copolymers.
• Evaluation of platelet adhesion and denaturation on copolymer surfaces.
• Analysis of fibrinogen binding site exposure using monoclonal antibodies.
• Assessment of film tensile properties and hydrolytic degradation.

Main Results:

• PLGA-PDXO MBC and RC copolymers exhibited effective antiplatelet adhesive properties.
• Platelet adhesion on PLGA-PDXO MBC was comparable to a known antiplatelet polymer, with reduced platelet denaturation compared to PLGA-poly(ε-caprolactone) MBC.
• Reduced exposure of αC and γ-chains (platelet binding sites) on PLGA-PDXO MBC surfaces was observed.
• PLGA-PDXO MBC films demonstrated good tensile strength and slow hydrolytic degradation.

Conclusions:

• PLGA-PDXO MBC copolymers possess significant antiplatelet adhesive properties.
• The combination of antiplatelet behavior, mechanical strength, and controlled degradation makes PLGA-PDXO MBC a promising candidate for bioabsorbable blood-contacting implants.