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Related Experiment Video

Updated: May 18, 2026

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

Digital microfluidic magnetic separation for particle-based immunoassays.

Alphonsus H C Ng¹, Kihwan Choi, Robert P Luoma

¹Institute of Biomaterials and Biomedical Engineering, University of Toronto, 164 College Street, Toronto, Ontario M5S 3G9, Canada.

Analytical Chemistry

|September 28, 2012

Summary

We developed a novel particle-based immunoassay using digital microfluidics (DMF) and magnetic forces. This air-based DMF method significantly reduces reagent use and analysis time for sensitive biomarker detection.

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Last Updated: May 18, 2026

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

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Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System

Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System

Published on: June 13, 2010

Area of Science:

Biotechnology
Analytical Chemistry
Microfluidics

Background:

Immunoassays are crucial for detecting biomarkers but often require large reagent volumes and long analysis times.
Digital microfluidics (DMF) offers precise control over discrete droplets for complex assays.
Existing DMF immunoassays typically use oil-based systems, limiting integration and efficiency.

Purpose of the Study:

To introduce a novel particle-based immunoassay format utilizing digital microfluidics (DMF) without oil-based droplet manipulation.
To develop an efficient on-chip method for separating unbound reagents in particle-based immunoassays.
To demonstrate the application of this DMF technique for quantifying analytes like thyroid stimulating hormone (TSH) and 17β-estradiol (E2).

Main Methods:

Developed a particle-based immunoassay on a DMF platform using air as the surrounding medium.
Implemented magnetic forces for efficient separation and resuspension of antibody-coated paramagnetic particles.
Designed droplet manipulation sequences for automated, multistep immunoassay protocols.

Main Results:

Achieved >90% removal of unbound reagents in a single step using the novel on-chip separation method.
Developed both noncompetitive and competitive immunoassay formats for TSH and E2, respectively.
Demonstrated a 100-fold reduction in reagent volume and a 10-fold decrease in analysis time compared to conventional methods, while maintaining clinical screening performance.

Conclusions:

The air-based DMF particle immunoassay format offers a significant advancement in assay efficiency and resource utilization.
This technique enables rapid, low-waste, and cost-effective quantitative analysis of proteins and small molecules in minimal sample volumes.
The developed DMF method holds great potential for future clinical diagnostic instruments.