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Continuous cell partitioning using an aqueous two-phase flow system in microfluidic devices.

Masumi Yamada1, Vivi Kasim, Megumi Nakashima

  • 1Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, Japan.

Biotechnology and Bioengineering
|October 2, 2004
PubMed
Summary

This study introduces a novel microfluidic system for stable aqueous two-phase laminar flow, enabling gravity-independent partitioning of large cells. The system shows improved efficiency with a pinched microchannel design.

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Area of Science:

  • Biotechnology
  • Microfluidics
  • Cell Biology

Background:

  • Gravity can significantly affect cell partitioning in microfluidic devices.
  • Traditional cell separation methods may lack efficiency or scalability.

Purpose of the Study:

  • To develop a microfluidic system for stable aqueous two-phase laminar flow.
  • To achieve continuous and gravity-independent partitioning of large cells.
  • To enhance cell partitioning efficiency using microchannel design modifications.

Main Methods:

  • Utilized a microfluidic system with two inlets and two outlets for aqueous two-phase laminar flow.
  • Employed plant cell aggregates (37-96 microm) as model particles.
  • Investigated the effects of flow rate and phase width on partitioning efficiency.

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  • Implemented a microchannel with a pinched segment to improve performance.

    • Main Results:

    • Successfully formed a stable aqueous two-phase laminar flow.
    • Demonstrated continuous partitioning of large plant cell aggregates.
    • Achieved improved partitioning efficiency using a pinched microchannel design.
    • Eliminated the influence of gravity on cell partitioning.

    Conclusions:

    • The novel microfluidic system offers a robust method for cell partitioning.
    • The pinched microchannel design enhances the efficiency of cell separation.
    • This technology is suitable for integration into micro total analysis systems (microTAS) and lab-on-a-chip devices due to its simplicity, applicability, and biocompatibility.