Characterization of PEG-Modified Composite Membranes for Microfluidic Oxygenator Applications

Area of Science:

• Biomedical Engineering
• Materials Science
• Medical Devices

Background:

• Microfluidic oxygenators are key for advancing extracorporeal membrane oxygenation (ECMO).
• Silicon-based membranes offer potential for improved gas transfer and fluid control.
• Surface modification is crucial for enhancing hemocompatibility and preventing protein adsorption.

Purpose of the Study:

• To characterize polyethylene glycol (PEG) surface modification on composite silicon-polydimethylsiloxane (PDMS) membranes.
• To evaluate the impact of PEG coating on microfluidic oxygenator properties, including gas transfer and hemocompatibility.
• To assess the stability and effectiveness of PEG modification for reducing protein adsorption.

Main Methods:

• Surface characterization using X-ray photoelectron spectroscopy (XPS) and water contact angle goniometry.
• Oxygen flux tests to quantify gas transfer rates.
• Protein adsorption studies using human serum albumin (HSA).

Main Results:

• Successful PEG attachment confirmed by XPS and increased hydrophilicity, stable for 2 weeks.
• Oxygen flux rates of 89.6 ± 17.9 mL/min/m² for unmodified and 50.8 ± 11.7 mL/min/m² for PEG-coated membranes.
• Significant reduction in HSA adsorption to 14 ± 6 μg/cm² on PEG-coated membranes.

Conclusions:

• PEG surface modification effectively enhances hemocompatibility of silicon-PDMS membranes for microfluidic oxygenators.
• The modified membranes demonstrate improved resistance to protein adsorption.
• These findings support the development of optimized surface strategies for next-generation ECMO devices.