Light-orchestrated multi-step solid-phase picodroplet reactors

Area of Science:

• Biochemistry
• Microfluidics
• Synthetic Biology

Background:

• Picoliter droplet microfluidics offer high efficiency but are limited to single-step reactions.
• Current platforms lack capabilities for reagent exchange and washing, hindering complex multi-step processes.
• Executing multi-step processes like oligonucleotide synthesis and immunoassays requires advanced droplet manipulation.

Purpose of the Study:

• To develop a novel platform overcoming limitations of current picodroplet microfluidics for multi-step reactions.
• To enable precise sequential manipulation of droplets and microbeads for complex chemical synthesis.
• To demonstrate a versatile system for miniaturized, automated reagent handling.

Main Methods:

• Development of light-orchestrated solid-phase picodroplet reactors.
• Utilizing optoelectronic tweezers for individual picodroplet and microbead manipulation.
• Demonstration of an eight-step click chemistry-based DNA ligation synthesis cycle with in situ detection.

Main Results:

• Achieved precise sequential encapsulation and decapsulation of beads with different reagent droplets.
• Ensured uniform reagent exposure and effective washing, mitigating errors from conventional methods.
• Successfully performed an eight-step DNA ligation synthesis with real-time fluorescence detection.

Conclusions:

• The developed platform overcomes single-step limitations in picodroplet microfluidics.
• It enables precise control over multi-step reactions, reducing errors and reagent consumption.
• The system shows potential for scalable, automated reagent handling in synthetic biology and drug discovery.