Compartmentalized Aqueous-in-Aqueous Droplets for Flow Biocatalysis

Area of Science:

• Biotechnology
• Synthetic Biology
• Chemical Engineering

Background:

• Compartmentalized bioreactions are essential for cellular regulation and synthetic biology.
• Traditional droplet bioreactors with impermeable interfaces limit reaction rates due to product accumulation.

Purpose of the Study:

• To engineer droplet bioreactors with selectively permeable interfaces for improved reaction efficiency.
• To investigate the impact of microfluidic-generated aqueous-in-aqueous droplet clusters on reaction rates.

Main Methods:

• Construction of aqueous two-phase system (ATPS) droplet bioreactors with selectively permeable interfaces.
• Utilizing microfluidics to create uniform aqueous-in-aqueous droplet clusters.
• Comparing reaction rates and conversion efficiencies with impermeable droplet reactors and non-microfluidic ATPS.

Main Results:

• The proposed droplet bioreactor achieved a 63.2% conversion rate, significantly higher than the 17.9% from impermeable reactors.
• Microfluidic aqueous-in-aqueous droplet clusters demonstrated up to a 6-fold enhancement in reaction rate.
• A unique flow interface effect was identified in droplet clusters.

Conclusions:

• Selectively permeable interfaces in ATPS droplet bioreactors facilitate continuous product release, enhancing reaction efficiency.
• Microfluidic control of droplet interfaces offers a novel strategy for accelerating enzymatic reactions via flow chemistry principles.
• This approach provides a new pathway for optimizing synthetic biology systems and understanding cellular compartmentalization.