Lipid-coated microdroplet array for in vitro protein synthesis

Area of Science:

• Biotechnology
• Microfluidics
• Biochemistry

Background:

• Monitoring long-term biological assays in microfluidic devices is challenging due to protein and DNA adsorption onto poly(dimethyl siloxane) (PDMS) surfaces.
• Adsorption and absorption issues on PDMS limit the reliability and duration of complex biological experiments.

Purpose of the Study:

• To develop a novel technique for creating stable microdroplet arrays within microfluidic devices.
• To overcome the challenges of surface adsorption and absorption in poly(dimethyl siloxane) (PDMS) microfluidic systems for biological assays.

Main Methods:

• Instantaneous arraying of aqueous microdroplets coated with a phospholipid membrane within a single microfluidic device.
• Utilizing a lipid bilayer coating to inhibit protein and DNA adsorption.
• Encapsulating droplets to reduce surface contact area and minimize absorption.

Main Results:

• Lipid-coated microdroplets demonstrated effective inhibition of protein and DNA adsorption.
• The microdroplet arrays showed temporal stability exceeding 20 hours with a size uniformity of coefficient of variation (CV) of 3%.
• Successful expression of green fluorescent protein was achieved within the lipid-coated microdroplets, confirming the method's efficacy.

Conclusions:

• Lipid-coated microdroplets provide a robust solution for long-term biological assays in PDMS microfluidic devices.
• The developed technique effectively prevents surface adsorption, ensuring the integrity of sensitive biomolecules and reactions.
• This method enhances the stability and reliability of in vitro translation systems and other complex biological monitoring applications.