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Demand-driven active droplet generation and sorting based on positive pressure-controlled fluid wall.

Yiwei Zhang1, Yiwei Lin1, Xianzhe Hong1

  • 1The Key Laboratory for Biomedical Photonics of MOE at Wuhan National Laboratory for Optoelectronics - Hubei Bioinformatics & Molecular Imaging Key Laboratory, Systems Biology Theme, Department of Biomedical Engineering, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China.

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Summary

Precise control of cell encapsulation in droplets is achieved using a novel microfluidic platform. This system utilizes positive pressure and fluid walls for on-demand droplet generation and manipulation, improving cell analysis efficiency.

Keywords:
Co-encapsulated dropletsFluid wallFluorescence-activated droplet sortingMicrofluidic deviceOn-demand droplet formation

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Area of Science:

  • Biotechnology
  • Microfluidics
  • Cellular analysis

Background:

  • Droplet microfluidics offers advantages for cell analysis by confining cells in droplets.
  • Random encapsulation in droplet microfluidics leads to inefficient cell loading and empty droplets.
  • Precise control over cell encapsulation is crucial for efficient droplet microfluidic applications.

Purpose of the Study:

  • To develop an innovative microfluidic droplet manipulation platform for precise cell encapsulation.
  • To enable on-demand generation and manipulation of droplets with controlled cell numbers.
  • To enhance the efficiency and controllability of droplet microfluidic systems for cell analysis.

Main Methods:

  • A microfluidic platform employing positive pressure as a stable driving force was developed.
  • A fluid wall was created by manipulating hydrodynamic resistance at a channel junction.
  • Controlled breakage of the fluid wall using pressure regulation allowed for precise fluid volume introduction.

Main Results:

  • Demonstrated droplet microfluidic manipulations including cell/droplet sorting and sorting of droplets with co-encapsulated cells and hydrogels.
  • Successfully achieved active and responsive generation of droplets encapsulated with cells.
  • The platform exhibited high stability, good controllability, and compatibility with other droplet microfluidic technologies.

Conclusions:

  • The developed microfluidic platform provides a simple, on-demand solution for precise control over droplet microfluidics.
  • This technology overcomes the challenge of random encapsulation, enabling efficient cell loading.
  • The platform has broad applicability in cell sorting, analysis, and responsive droplet generation.