Oligo(ethylene glycol) containing polymer brushes as bioselective surfaces

Area of Science:

• Materials Science
• Biotechnology
• Surface Chemistry

Background:

• Biocompatible materials are crucial for medical devices and diagnostics.
• Surface modification techniques are essential for controlling biomaterial interactions.
• Oligo(ethylene glycol) (OEGn) chains are known for their protein-repellent properties.

Purpose of the Study:

• To prepare biocompatible polymer brushes on silicon oxide surfaces using nitroxide-mediated polymerization.
• To compare the performance of grown polymer brushes with deposited assemblies of OEGn-terminated silanes.
• To evaluate the potential of these surfaces for micro- and nanoscale device applications.

Main Methods:

• Nitroxide-mediated polymerization of styrenic monomers with OEGn moieties.
• Surface characterization using near-edge X-ray absorption fine structure and water contact angle measurements.
• Biocompatibility assessment through protein adsorption and cell adhesion studies.

Main Results:

• Grown polymer brushes, especially with short OEGn chains, significantly suppressed protein adsorption compared to deposited assemblies.
• Higher surface coverage by polymer brushes was attributed to their superior protein-repellent effect.
• OEGn-containing polymer brushes effectively prevented nonspecific cell adhesion.

Conclusions:

• Surface-tethered OEGn polymer brushes offer superior biocompatibility and protein resistance.
• These polymer brushes are highly effective in preventing nonspecific cell adhesion.
• The developed surfaces hold significant potential for creating advanced micro- and nanoscale devices.