Characterization of CIM monoliths as enzyme reactors.

Area of Science:

• Biochemistry
• Chemical Engineering
• Enzyme Technology

Background:

• Enzyme immobilization is crucial for developing stable and reusable biocatalysts.
• Chromatographic Mixed-Mode (CIM) monolithic supports offer unique advantages for enzyme immobilization due to their high surface area and flow-through properties.

Purpose of the Study:

• To immobilize key metabolic enzymes (citrate lyase, malate dehydrogenase, isocitrate dehydrogenase, lactate dehydrogenase) onto CIM monolithic supports.
• To evaluate the stability, reproducibility, and kinetic behavior of these immobilized enzymes.
• To assess potential diffusional limitations in the immobilized enzyme reactors.

Main Methods:

• Enzyme immobilization onto CIM monolithic supports.
• Long-term stability and reproducibility testing.
• Kinetic analysis to determine Michaelis-Menten constant (K(m)) and turnover number (k(3)).
• Comparison of kinetic parameters between soluble and immobilized enzymes.

Main Results:

• Immobilized enzymes exhibited long-term stability and reproducible performance.
• The Michaelis-Menten constant (K(m)) and turnover number (k(3)) were unaffected by flow rate.
• K(m) values for immobilized enzymes were comparable to their soluble counterparts.
• Absence of diffusional limitations was confirmed in the immobilized CIM enzyme reactors.

Conclusions:

• CIM monolithic supports are effective for immobilizing metabolic enzymes.
• The immobilized enzyme reactors demonstrate robustness and predictable kinetics.
• The lack of diffusional limitations suggests efficient mass transfer, ideal for biocatalysis.