Passive Droplet Microfluidic Platform for High-Throughput Screening of Microbial Proteolytic Activity

Area of Science:

• Microbiology
• Biotechnology
• Microfluidics

Background:

• Traditional bacterial isolation methods are costly, slow, and limit the discovery of rare or slow-growing microbes.
• Ultrahigh-throughput droplet microfluidic screening offers a promising alternative to conventional techniques.

Purpose of the Study:

• To develop and present a novel passive droplet-based microfluidic method for isolating proteolytic microorganisms.
• To improve the efficiency and throughput of microbial screening assays for biotechnological applications.

Main Methods:

• Encapsulation of single microbial cells within gelatin microgel compartments for clonal cultivation.
• Passive sorting of microcultures in droplets based on deformability using a novel microfluidic chip design.

Main Results:

• The developed method achieves ultrahigh-throughput screening of microorganisms.
• A 50-fold improvement in throughput was observed compared to previous deformability-based droplet sorters.
• The method effectively isolates proteolytic bacteria, crucial for various industries.

Conclusions:

• This novel droplet microfluidic assay significantly enhances the isolation of proteolytic microorganisms.
• The approach reduces the time and resources needed for discovering industrially relevant bacterial strains.
• This method expands the toolkit for droplet-based microbial enrichment and isolation.