Clear zone formation in microdroplets for high-throughput screening for lactic acid bacteria

Area of Science:

• Biotechnology
• Microbiology
• Microfluidics

Background:

• Droplet microfluidic technology offers powerful capabilities for biotechnological applications.
• Existing methods for culturing and screening microorganisms can be labor-intensive and time-consuming.
• There is a need for high-throughput methods to isolate specific microbial strains.

Purpose of the Study:

• To develop a novel high-throughput screening method for lactic acid bacteria using droplet microfluidics.
• To adapt conventional clear zone-based screening methods to a droplet microfluidic format.
• To demonstrate the efficacy of the method for isolating specific bacterial species and from environmental samples.

Main Methods:

• Reproduced conventional agar plate culture of lactic acid bacteria forming clear zones within water-in-oil droplets.
• Developed a system for collecting individual droplets containing growing lactic acid bacteria.
• Utilized droplet microfluidics for high-throughput screening and isolation.

Main Results:

• Successfully achieved specific recovery of *Lactiplantibacillus plantarum* from a mixed culture with *Escherichia coli*.
• Demonstrated successful isolation of lactic acid bacteria from an environmental sample.
• Validated the droplet microfluidic method for microbial screening based on clear zone formation.

Conclusions:

• Droplet microfluidic technology can be effectively applied to microbial cultivation and screening.
• The developed method expands the application scope of droplet microfluidics in microbiology.
• This approach offers a high-throughput and efficient alternative for isolating specific microbial strains.