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Electrowetting-based Digital Microfluidics Platform for Automated Enzyme-linked Immunosorbent Assay

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Published on: February 23, 2020

Microfluidic cell disruption system employing a magnetically actuated diaphragm.

Yun Suk Huh¹, Jong Hyun Choi, Kyoung Ae Kim Huh

¹Separation Process Laboratory, Department of Chemical and Biomolecular Engineering (BK21 program), Korea Advanced Institute of Science and Technology, Daejeon, Korea.

Electrophoresis

|November 17, 2007

Summary

A novel microfluidic chip efficiently lyses cells using a micromixer and solid-phase extraction (SPE) for protein analysis. This system achieves over 90% cell lysis efficiency, enabling precise intracellular content quantification.

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Area of Science:

Biotechnology
Analytical Chemistry
Microfluidics

Background:

Efficient cell lysis is crucial for intracellular protein analysis.
Existing methods can be time-consuming and labor-intensive.
Miniaturized systems offer potential for streamlined sample preparation.

Purpose of the Study:

To develop and optimize a microfluidic cell lysis chip for quantitative intracellular protein analysis.
To integrate cell disruption, lysate manipulation, and solid-phase extraction (SPE) into a single device.
To evaluate the chip's efficiency using model bacteria expressing intracellular proteins.

Main Methods:

Development of a microfluidic chip with a magnetically actuated micromixer and an integrated SPE unit.
Optimization of cell lysis conditions, including lysis buffer, mixing time, and micromixer frequency.
Utilized recombinant Escherichia coli expressing enhanced green fluorescent protein (EGFP) and lipase as model systems.
Purification of cell lysate using the packed SPE within the microfluidic chip.

Main Results:

Optimized microfluidic chip achieved over 90% cell lysis efficiency.
Relative fluorescence intensity of EGFP exceeded 94% after lysis and purification.
The system effectively filtered debris from the cell lysate.
Demonstrated efficient disruption of model bacteria for intracellular content recovery.

Conclusions:

The developed microfluidic cell lysis chip provides an efficient and miniaturized solution for sample preparation.
This technology is applicable to various applications requiring cell disruption for subsequent analysis of intracellular components.
The integrated micromixer and SPE unit enhance the quantitative analysis of intracellular proteins.