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A Microfluidic Chip for the Versatile Chemical Analysis of Single Cells

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Deterministic Lateral Displacement Microfluidic Chip for Minicell Purification.

Ahmad Sherbaz^1,2, Büşra M K Konak², Pegah Pezeshkpour¹

¹Laboratory of Process Technology, NeptunLab, Department of Microsystems Engineering (IMTEK), University of Freiburg, 79110 Freiburg im Breisgau, Germany.

|March 26, 2022

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This summary is machine-generated.

Deterministic lateral displacement (DLD) microfluidic chips effectively separate rod-shaped bacteria from minicells. Optimized designs achieved 75.5% efficiency, enabling high-throughput purification for bioreactors.

Area of Science:

Microfluidics
Biotechnology
Cell Separation

Background:

Deterministic lateral displacement (DLD) is a microfluidic technique for particle separation.
It is suitable for separating cells of different sizes but similar shapes.
DLD has potential for integration into bioreactors for therapeutic applications.

Purpose of the Study:

To develop and optimize a DLD microchip for separating rod-shaped bacterial cells from submicron spherical minicells.
To assess the impact of geometrical parameters and flow rates on separation efficiency.

Main Methods:

Design and fabrication of two DLD microchips using soft lithography with polydimethylsiloxane (PDMS).
Microchips featured cylindrical posts of 50 and 25 µm with spacings of 15 and 2.5 µm.

Keywords:

Escherichia coli bacterial cell separation deterministic lateral displacement microfluidics minicells

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Assessment of separation potential at various flow rates and optimization of geometrical parameters.

Main Results:

Negligible shear effect on separation efficiency was observed for both designs.
Higher flow rates led to faster separation.
Optimized parameters achieved a single-stage separation efficiency of up to 75.5%.

Conclusions:

The developed DLD microchip effectively separates bacterial cells from minicells.
Optimized designs show potential for high-throughput separation and purification modules.
This technology can be directly integrated into bioreactors for advanced bioprocessing.