Polymerization of glucans by enzymatically active membranes.

Area of Science:

• Biotechnology
• Enzyme Engineering
• Polymer Chemistry

Background:

• Conventional enzyme membrane reactors hinder continuous macromolecule synthesis and product release.
• Enzyme immobilization within large-pore membranes creates miniaturized bioreactors for improved control.

Purpose of the Study:

• To develop a continuous transmembrane process for enzymatic 1,4-alpha-glucan synthesis.
• To investigate the influence of process parameters on enzyme activity and product characteristics.

Main Methods:

• Enzyme immobilization of amylosucrase onto polypropylene microfiltration membranes via photoinitiated graft polymerization of glycidyl methacrylate.
• Utilizing sucrose as substrate and maltooligosaccharides (DP 3-6) as primers.
• Investigating the effects of primer concentration and transmembrane flow rate on enzyme activity, molecule growth, and glucose coupling efficiency.

Main Results:

• Successful enzymatic chain elongation of maltooligosaccharides using membrane-immobilized amylosucrase in a transmembrane process.
• Demonstrated control over amylosucrase activity, molecule growth, and glucose coupling efficiency by adjusting primer concentration and flow rate.
• Achieved continuous synthesis and product removal, overcoming limitations of conventional reactors.

Conclusions:

• The developed transmembrane bioreactor system enables continuous enzymatic synthesis of macromolecules with controlled product size.
• This approach offers a promising platform for efficient and scalable production of oligosaccharides and other macromolecules.
• Further optimization of flow rates and primer concentrations can fine-tune product characteristics for specific applications.