Membrane bioreactor separator system for integrated IgG fragmentation and Fab purification.

Area of Science:

• Biotechnology
• Biochemical Engineering
• Separation Science

Background:

• Production of Fragment antigen-binding (Fab) fragments from immunoglobulin G (IgG) is crucial for therapeutic applications.
• Traditional methods for IgG fragmentation and purification can be complex and inefficient.
• Membrane-based systems offer potential for process intensification in biopharmaceutical manufacturing.

Purpose of the Study:

• To develop and evaluate a novel membrane-based bioreactor system for simplified and efficient production of pure Fab from human IgG.
• To optimize conditions for IgG fragmentation and Fab recovery using the membrane bioreactor.
• To compare the performance of the membrane bioreactor with conventional liquid-phase reactions.

Main Methods:

• A bioreactor system comprising microporous anion-exchange membrane discs was designed.
• Human IgG was adsorbed onto the membranes, followed by enzymatic fragmentation with papain under optimized conditions.
• Fab fragments were recovered in the flow-through, while other fragments were eluted with a high salt buffer.

Main Results:

• The membrane bioreactor system simplified the overall process for Fab production, achieving high product purity and recovery.
• Fab recovery was significantly influenced by the pH of the feed solution.
• The rate of IgG fragmentation by papain was approximately three times higher in the membrane bioreactor compared to liquid-phase reactions.

Conclusions:

• The developed membrane bioreactor-separator system offers a simplified and efficient approach for producing pure Fab fragments from human IgG.
• This technology demonstrates improved fragmentation kinetics and high product recovery, suggesting its potential for industrial-scale biopharmaceutical production.
• Further optimization of pH conditions can enhance Fab recovery, maximizing the utility of this innovative bioreactor design.