Triple Enzymatic Cascade Reaction to Produce Hydroxytyrosol Acetate from Olive Leaves Using Integrated Membrane...

Area of Science:

• Biotechnology
• Enzyme Engineering
• Green Chemistry

Background:

• Olive leaves contain valuable compounds like oleuropein.
• Efficient enzymatic conversion of oleuropein derivatives is challenging.
• Membrane bioreactors offer potential for continuous bioprocessing.

Purpose of the Study:

• To develop and optimize an integrated membrane bioreactor system for hydroxytyrosol acetate production.
• To cascade three enzymatic reactions for efficient conversion of oleuropein.
• To demonstrate the sustainability of the developed bioprocess.

Main Methods:

• Utilized three cascaded membrane bioreactors (MBRs) for sequential enzymatic reactions.
• Immobilized enzymes including β-glucosidase and a mutant hydrolase/acyltransferase (PestE).
• Optimized reactor configurations and reaction conditions for high conversion rates.

Main Results:

• Achieved 95% conversion of oleuropein to oleuropein aglycone (OA).
• Converted OA to hydroxytyrosol (HY) with 70% efficiency.
• Produced hydroxytyrosol acetate (HA) with 98% conversion and simultaneous 98% extraction.

Conclusions:

• Demonstrated the successful engineering of continuous cascade enzymatic reactions using artificial membranes.
• Highlighted the system's ability to tailor enzyme compartmentalization and mass transport.
• Confirmed the environmental sustainability of the integrated membrane bioreactive system.