Plasma protein adsorption and platelet adhesion onto comb-like PEO gradient surfaces

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Polymer Science

Background:

• Biomaterial surface properties significantly influence biological interactions.
• Polyethylene oxide (PEO) is known for its protein-repellent properties.
• Controlling surface chemistry gradients is crucial for optimizing biomaterial performance.

Purpose of the Study:

• To create comb-like polyethylene oxide (PEO) gradient surfaces on low-density polyethylene (PE).
• To investigate the effect of PEO chain density and length on surface properties.
• To evaluate the surfaces' resistance to plasma protein adsorption and platelet adhesion.

Main Methods:

• Corona discharge treatment of PE followed by graft copolymerization of poly(ethylene glycol) monomethacrylate (PEO-MA) macromers.
• Preparation of surfaces with varying PEO densities and PEO repeat units (1, 5, 10).
• Characterization using water contact angle, FTIR-ATR, and electron spectroscopy for chemical analysis.

Main Results:

• Successful preparation of comb-like PEO gradient surfaces with increasing PEO density.
• Water contact angle, FTIR-ATR, and electron spectroscopy confirmed successful grafting and density gradient.
• Reduced plasma protein adsorption and platelet adhesion with increased PEO chain length and surface density.
• PEO10-MA grafted surfaces with high PEO density demonstrated excellent anti-fouling properties and prevented platelet activation.

Conclusions:

• Comb-like PEO gradient surfaces can be effectively prepared on PE substrates.
• Surface density and chain length of PEO are critical factors in preventing biofouling.
• These gradient surfaces show significant potential for biomedical applications requiring enhanced biocompatibility.