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Updated: Jul 19, 2025

A Microfluidic Chip for the Versatile Chemical Analysis of Single Cells

A Microfluidic Chip for the Versatile Chemical Analysis of Single Cells

Published on: October 15, 2013

Micro- and nanochamber array system for single enzyme assays.

Kazuki Iijima¹, Noritada Kaji^2,3, Manabu Tokeshi^4,5

¹Department of Biomolecular Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan.

Scientific Reports

|August 16, 2023

Summary

This summary is machine-generated.

Researchers developed micro- and nanochambers with a novel sealing system to measure single enzyme activity. Enzyme reaction rates decrease in smaller chambers, potentially mimicking cellular environments.

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Area of Science:

Biochemistry
Nanotechnology
Enzyme kinetics

Background:

Enzyme activity measurements are crucial for understanding biological processes.
Existing methods face challenges with small sample volumes and evaporation.
Replicating confined cellular environments is difficult.

Purpose of the Study:

To develop micro- and nanochamber arrays for single enzyme molecule analysis.
To create a novel reversible sealing system to prevent evaporation.
To investigate the effect of chamber size on enzyme kinetics.

Main Methods:

Fabrication of reaction chambers ranging from 624 femtoliters to 270 attoliters.
Development of a polydimethylsiloxane (PDMS)-based pneumatic valve actuator for sealing.
Measurement of β-D-galactosidase (β-gal) hydrolysis rates (kcat) in different chamber sizes.
Investigation of proton spatial localization within chambers.

Main Results:

A reversible sealing system using a PDMS pneumatic valve actuator was successfully developed.
Evaporation was prevented, allowing for long-term assays.
Hydrolysis rates (kcat) of β-gal decreased with decreasing chamber size.
The observed trend correlated with the specific surface area of the chambers.

Conclusions:

The developed micro- and nanochamber system enables single enzyme molecule activity measurements.
Chamber size significantly impacts enzyme kinetics, possibly due to surface area effects and proton localization.
This system can be used to simulate confined intracellular environments and molecular crowding.