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Updated: Jun 11, 2026

Microfluidic Buffer Exchange for Interference-free Micro/Nanoparticle Cell Engineering

Microfluidic Buffer Exchange for Interference-free Micro/Nanoparticle Cell Engineering

Published on: July 10, 2016

Continuous scalable blood filtration device using inertial microfluidics.

Albert J Mach¹, Dino Di Carlo

¹Department of Bioengineering, University of California, Los Angeles, CA, USA.

Biotechnology and Bioengineering

|July 1, 2010

Summary

This study introduces a novel microfluidic device for label-free cell separation. The technology efficiently removes pathogenic bacteria from blood using size-based inertial forces, offering a high-throughput solution.

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Area of Science:

Biotechnology and Biomedical Engineering
Microfluidics and Cell Separation Technologies

Background:

Cell separation is crucial for diagnostics, research, and regenerative medicine.
Label-free, size-based techniques offer alternatives to costly or problematic methods like centrifugation and filtration.
Existing methods often face challenges with throughput and sample volume processing.

Purpose of the Study:

To present a massively parallel microfluidic device for label-free separation of pathogenic bacteria from blood.
To demonstrate macroscale performance in high-throughput, continuous sample processing.
To utilize size-dependent inertial lift forces for efficient cell separation.

Main Methods:

A novel, massively parallel microfluidic device with 40 single microchannels in a radial array.

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Microfluidic Buffer Exchange for Interference-free Micro/Nanoparticle Cell Engineering

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Passive cell separation based on differential transit times and size-dependent inertial lift forces.

A gradual channel expansion design to enhance cell collection efficiency near microchannel walls.

Main Results:

Demonstrated >80% removal of pathogenic bacteria from blood after two passes.
Achieved high-throughput processing of 240 mL/h, equivalent to 400 million cells/min.
The device operates continuously and in a label-free manner.

Conclusions:

The developed microfluidic device offers a robust and parallelizable solution for blood filtration.
This label-free approach is suitable for various cell separation and concentration applications from large sample volumes.
The technology shows significant potential for clinical diagnostics and biological research.