Responsive Emulsions Enabled by Supramolecular Polymers for Recyclable Biocatalysis.

Area of Science:

• Biocatalysis and Green Chemistry
• Supramolecular Polymer Chemistry

Background:

• Emulsion biocatalysis utilizes liquid-liquid interfaces for enhanced mass transfer but faces challenges in catalyst and emulsifier recovery.
• Developing recyclable systems is crucial for sustainable industrial chemical synthesis.

Purpose of the Study:

• To design a responsive emulsion system for recyclable biocatalysis using supramolecular polymers.
• To overcome the downstream processing limitations of conventional emulsion systems.

Main Methods:

• Copolymerization of crown ether acrylate monomers with N-isopropylacrylamide to create amphiphilic supramolecular polymers.
• Formation of robust emulsions capable of hosting isolated enzymes or whole-cell catalysts.
• Utilizing reversible host-guest interactions (crown-ether/secondary-ammonium) for supramolecular cross-linking and catalyst recovery.

Main Results:

• The developed supramolecular polymer-stabilized emulsions demonstrated robust performance, surpassing conventional biphasic systems.
• A host-guest recognition strategy enabled straightforward recovery and reuse of emulsifiers and catalysts with minimal activity loss.
• Escherichia coli retained 80% activity over three cycles in the responsive emulsion.
• Mild pH modulation allowed for reversible switching between emulsion and two-phase states.

Conclusions:

• Supramolecular polymer-stabilized emulsions offer a versatile and recyclable platform for efficient biocatalysis.
• This approach provides a general strategy for integrating supramolecular chemistry with green chemical synthesis.
• The system holds significant potential for sustainable industrial applications.