Microfluidic platform for combinatorial synthesis in picolitre droplets.

Area of Science:

• Microfluidics
• Combinatorial Chemistry
• Drug Discovery

Background:

• Miniaturized combinatorial synthesis is crucial for efficient drug screening.
• Conventional methods often require large reagent volumes and are time-consuming.
• Droplet-based microfluidics offers a promising alternative for high-throughput synthesis.

Purpose of the Study:

• To develop and demonstrate a droplet-based microfluidic platform for miniaturized combinatorial synthesis.
• To produce a library of small molecules for early-stage drug screening, specifically targeting thrombin inhibitors.
• To showcase the platform's efficiency and potential for broader applications in chemical synthesis.

Main Methods:

• Formation of picolitre droplets containing reagents in microfluidic chips.
• Off-chip storage of reagent droplets using stabilizing surfactants.
• On-chip combinatorial fusion of different reagent droplets in a second microfluidic chip.
• Demonstration using a three-component Ugi-type reaction.

Main Results:

• Successfully synthesized a 7x3 library of small molecules with potential thrombin inhibitory activity.
• Achieved high throughput, producing 10^6 droplets/reaction at 2.3 kHz.
• Utilized extremely low reaction volumes (3.1 pL), six orders of magnitude smaller than conventional techniques.
• Demonstrated the ability to divide droplets for diverse downstream screening applications.

Conclusions:

• The droplet-based microfluidic platform enables highly efficient miniaturized combinatorial synthesis.
• This approach significantly reduces reagent consumption and reaction volume.
• The platform is suitable for generating compound libraries for drug screening and has potential for material science and reaction optimization.