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Use of Dual Optical Tweezers and Microfluidics for Single-Molecule Studies

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Note: Four-port microfluidic flow-cell with instant sample switching.

Christopher A MacGriff¹, Shaopeng Wang, Nongjian Tao

¹School of Electrical, Computer, and Energy Engineering, Arizona State University, Tempe, Arizona 85287, USA.

The Review of Scientific Instruments

|November 5, 2013

Summary

This summary is machine-generated.

A novel microfluidic device enables rapid, millisecond-scale switching for surface plasmon resonance (SPR) analysis. This high-speed delivery system minimizes sample dispersion and allows for kinetic analysis of binding events with minimal sample consumption.

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Last Updated: May 6, 2026

Use of Dual Optical Tweezers and Microfluidics for Single-Molecule Studies

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Published on: December 23, 2013

Area of Science:

Biophysical Chemistry
Analytical Chemistry
Microfluidics

Background:

Surface Plasmon Resonance (SPR) is a label-free optical sensing technique.
Accurate kinetic analysis of biomolecular interactions is crucial in drug discovery and diagnostics.
Traditional SPR systems can be limited by slow sample delivery and dispersion.

Purpose of the Study:

To develop a high-speed microfluidic delivery device for SPR sensors.
To enable rapid kinetic analysis of biomolecular binding events.
To minimize sample consumption and dispersion during SPR measurements.

Main Methods:

A four-port microfluidic cell with a high-speed selector valve was designed.
The device facilitates alternate delivery of buffer and sample solutions.
Buffer/sample switching times were optimized to the millisecond scale.

Main Results:

Achieved millisecond-scale buffer/sample switching, reducing sample dispersion.
Enabled SPR-based kinetic analysis with dissociation rate constants (k(d)) up to 130 s(-1).
Demonstrated minimal sample consumption, requiring only 1 μL per measurement.

Conclusions:

The developed microfluidic device significantly enhances SPR analysis speed and efficiency.
This technology allows for precise kinetic characterization of fast binding interactions.
The system offers a valuable tool for high-throughput screening and kinetic studies with low sample volumes.