Highly Efficient One-Step Protein Immobilization on Polymer Membranes Supported by Response Surface Methodology

Area of Science:

• Materials Science
• Biotechnology
• Surface Chemistry

Background:

• Covalent protein immobilization on polymers is advantageous but often complex and costly.
• Existing methods face limitations in scalability and chemical requirements.
• Developing efficient, chemical-free protein coupling strategies is crucial for advanced materials.

Purpose of the Study:

• To investigate an electron-beam-based process for covalent immobilization of bovine serum albumin (BSA) onto polyvinylidene fluoride (PVDF) membranes.
• To optimize the immobilization process using Design of Experiments (DoE) and Response Surface Methodology (RSM).
• To characterize the immobilized membranes and assess the process efficiency and reusability.

Main Methods:

• Electron beam irradiation was used for direct covalent coupling of BSA onto PVDF membranes.
• Design of Experiments (DoE) identified key process parameters: BSA concentration, impregnation method, impregnation time, and irradiation dose.
• Response Surface Methodology (RSM) was employed for process optimization, followed by comprehensive material characterization.

Main Results:

• A one-step electron-beam process achieved a high BSA grafting yield of 955 mg m⁻² with 3.6% relative standard deviation.
• The impregnation solution could be reused five times without compromising BSA grafting yield, demonstrating high efficiency.
• Extensive characterization confirmed successful immobilization and evaluated membrane properties, including filtration performance and surface characteristics.

Conclusions:

• Electron-beam irradiation offers a clean, fast, and chemical-free method for efficient BSA immobilization on PVDF membranes.
• The optimized one-step process is highly efficient, reproducible, and cost-effective.
• This technique holds significant potential for developing advanced functional membranes for various applications.