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

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Microfluidic device for immunoassays based on surface plasmon resonance imaging.

Yiqi Luo¹, Fang Yu, Richard N Zare

¹Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.

|April 25, 2008

Summary

This study presents a novel microfluidic device for rapid antibody-antigen detection using surface plasmon resonance (SPR) imaging. The system achieves subnanomolar sensitivity in minutes, offering a significant advancement in biosensing technology.

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Area of Science:

Biomedical Engineering
Analytical Chemistry
Nanotechnology

Background:

Traditional immunoassay methods often require significant time and sample volumes.
Real-time monitoring of molecular interactions is crucial for efficient diagnostics.

Purpose of the Study:

To develop a rapid and sensitive biosensing platform for detecting antibody-antigen interactions.
To leverage microfluidics and surface plasmon resonance imaging for enhanced immunoreaction analysis.

Main Methods:

Fabrication of a polydimethylsiloxane (PDMS) microfluidic device with an array of gold spots.
Utilizing surface plasmon resonance (SPR) imaging for real-time monitoring of antibody-antigen binding events.
Investigating signal amplification using gold nanoparticles.

Main Results:

The combined microfluidic and SPR imaging system reduced reaction time and sample consumption.
Real-time detection and quantitative characterization of immunoreactions were achieved in approximately 10 minutes.
Subnanomolar sensitivity was demonstrated, reaching the ten to one hundred picomolar level with gold nanoparticle amplification (60 min).

Conclusions:

The developed microfluidic SPR imaging device offers a highly efficient platform for rapid and sensitive detection of biomolecular interactions.
This technology has potential applications in diagnostics and fundamental research requiring fast, low-volume immunoassays.