A Low Protein Binding Electrospun Membrane Filter for Efficient Biological Media Sterilization

Area of Science:

• Materials Science
• Biomedical Engineering
• Filtration Technology

Background:

• Sterile filtration is crucial for medical applications.
• Existing filters can be expensive and may cause sample loss.
• Hydrophobic materials offer potential for novel filtration methods.

Purpose of the Study:

• To develop an affordable sterile membrane filter using electrospun polycaprolactone (PCL) fibers.
• To evaluate the filtration efficiency and biocompatibility of the PCL membrane filter (EPF).
• To investigate the mechanism of bacterial removal by the EPF.

Main Methods:

• Electrospinning of polycaprolactone (PCL) fibers to create nanosized fibrous membranes.
• Syringe filtration of biological fluids using PCL membrane filters of varying thicknesses.
• Bacterial filtration assays to assess efficiency and filtrate quality.
• Electron microscopy to analyze bacterial entrapment.
• Protein binding assays and cell viability tests to evaluate filtrate quality.

Main Results:

• Electrospun PCL membranes exhibited high force at break and minimal elongation, suitable for syringe filtration.
• The hydrophobic nature of the PCL membrane facilitated efficient filtration of small biological fluid volumes without wetting media loss.
• The developed PCL membrane filter (EPF) demonstrated excellent bacterial filtration, comparable to commercial filters.
• Electron microscopy confirmed bacterial entrapment on PCL nanofibers.
• EPF devices, particularly those with ~0.8 mm thickness and high porosity, effectively retarded bacterial movement, enabling filtration of up to 50 mL of contaminated media.
• The PCL nanofiber filter showed low protein binding and maintained filtrate quality, as evidenced by cell viability assays.

Conclusions:

• Electrospun PCL membrane filters offer an affordable and effective platform for sterile filtration of biological fluids.
• The EPF device provides excellent bacterial removal without compromising the quality of the filtrate, making it suitable for medical applications.
• The study presents a promising alternative sterilization method for medical applications, leveraging the unique properties of PCL nanofibers.