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Related Concept Videos

iChip01:24

iChip

The cultivation of environmental microorganisms has long been hindered by the inability to replicate complex native conditions in vitro. The isolation chip (iChip) addresses this limitation by facilitating the growth of previously uncultivable microorganisms through in situ incubation. Designed for high-throughput microbial cultivation, the iChip comprises hundreds of microchambers, each capable of housing a single microbial cell. These microchambers are loaded with a mixture of molten agar and...

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Multiple-channel emulsion chips utilizing pneumatic choppers for biotechnology applications.

Yen-Heng Lin1, Cheng-Tso Chen, Lynn L H Huang

  • 1Department of Engineering Science, National Cheng Kung University, Tainan, Taiwan, Republic of China.

Biomedical Microdevices
|June 20, 2007
PubMed
Summary

A new microfluidic chip with active pneumatic choppers enables high-throughput production of uniform micro-scale emulsions. This technology allows fine-tuning of droplet size for applications in cosmetics, food, and biotechnology.

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Area of Science:

  • Microfluidics
  • Biotechnology
  • Materials Science

Background:

  • Monodispersed micro-scale emulsions are vital for cosmetics, food, and biotechnology.
  • Existing methods for emulsion formation can be limited in throughput and control.

Purpose of the Study:

  • To develop a novel microfluidic chip for high-throughput generation of uniform microdroplets.
  • To investigate the use of active pneumatic choppers for precise droplet size control.
  • To demonstrate the formation of biocompatible microspheres using the developed chip.

Main Methods:

  • A microfluidic chip with multiple channels was designed, incorporating hydrodynamic flow focusing and active pneumatic choppers.
  • Oil-in-water microdroplets were generated, and their size distribution was analyzed using coefficient of variation.
  • Droplet size was tuned by adjusting flow velocities and chopping frequency.
  • Collagen and calcium-alginate (Ca-alginate) were used to form microspheres via the liquid-cutting technique.

Main Results:

  • The microfluidic chip successfully generated oil-in-water microdroplets with diameters from 6 to 120 micrometers.
  • A coefficient of variation below 3.75% was achieved, indicating high uniformity.
  • Droplet size was actively tunable through flow velocity ratios and chopping frequency.
  • Biocompatible microspheres were successfully fabricated using collagen and Ca-alginate.

Conclusions:

  • The developed microfluidic chip offers a high-throughput and tunable platform for micro-emulsion and microsphere production.
  • The integration of active pneumatic choppers enhances control over droplet size and uniformity.
  • This technology shows significant promise for applications in biotechnology, nano-medicine, and cosmetics.