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Updated: Sep 25, 2025

Computer Numerical Control Micromilling of a Microfluidic Acrylic Device with a Staggered Restriction for Magnetic Nanoparticle-Based Immunoassays

Computer Numerical Control Micromilling of a Microfluidic Acrylic Device with a Staggered Restriction for Magnetic Nanoparticle-Based Immunoassays

Published on: June 23, 2022

A microreactor sealing method using adhesive tape for digital bioassays.

Hideyuki Yaginuma¹, Kuniko Ohtake¹, Takako Akamatsu¹

¹Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, Tokyo, Japan. ktabata@smb.t.u-tokyo.ac.jp.

|April 28, 2022

Summary

A new method called physical isolation of tiny reactors with adhesive tape (PITAT) simplifies digital microreactor assays. This cost-effective technique enables sensitive infectious disease testing at the point of care.

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Last Updated: Sep 25, 2025

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Area of Science:

Biotechnology
Analytical Chemistry
Microfluidics

Background:

Digital microreactor assays offer sensitive biological testing but face challenges with microchamber sealing.
Current sealing methods, like fluid oil, are difficult for non-experts, limiting assay accessibility.

Purpose of the Study:

To develop a simple, cost-effective, and user-friendly method for sealing microreactors in digital assays.
To validate the efficacy of the proposed method for sensitive molecular and particle detection.

Main Methods:

Developed the physical isolation of tiny reactors with adhesive tape (PITAT) method using commercially available pressure-sensitive adhesive (PSA) tape.
Evaluated different PSA tape formulations, identifying rubber-based adhesives as optimal.
Performed single-molecule enzyme assays and single-particle influenza virus counting within PITAT-sealed microreactors.

Main Results:

PSA tape effectively seals microreactors, preventing molecular diffusion.
PITAT achieved results quantitatively comparable to conventional oil sealing, but with increased speed and reduced cost.
Successful demonstration of single-molecule enzyme assays and influenza virus particle counting using PITAT.

Conclusions:

PITAT offers a practical and efficient alternative to traditional microreactor sealing methods.
The technique is suitable for developing sensitive infectious disease diagnostics at the point of care.
PITAT has the potential to broaden the accessibility of digital microreactor assays.