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Optically-controlled closable microvalves for polymeric centrifugal microfluidic devices.

M Shane Woolf¹, Leah M Dignan, Hannah M Lewis

¹University of Virginia, USA. msw2s@virginia.edu.

|March 24, 2020

Summary

This summary is machine-generated.

A new laser-actuated microfluidic valve offers a >99% success rate, simplifying lab-on-a-chip systems and enabling complex automated assays like DNA analysis.

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Area of Science:

Microfluidics
Lab-on-a-chip technology
Biochemical assay automation

Background:

Microvalving is crucial for microfluidic systems, enabling integrated unit operations.
Existing microfluidic valves often have limitations, especially under high rotational frequencies or pressure.
Current valve designs can add complexity, require extra materials, and increase fabrication steps.

Purpose of the Study:

To report the characterization and optimization of a novel laser-actuated, closable microfluidic valve.
To address limitations of existing microvalving methods in polymeric microfluidic devices.
To demonstrate the valve's utility in automated centrifugal microfluidic systems.

Main Methods:

Development and optimization of a laser-actuated valve for polymeric microfluidic devices.
Characterization of valve performance under operational conditions, including high rotational frequencies (up to 605 x g).
Integration and demonstration of the laser-actuated valve system on a centrifugal dynamic solid phase extraction (dSPE) device.

Main Results:

Achieved a >99% success rate for leak-free valve closures up to 605 x g.
Successfully demonstrated the valve on an automated, centrifugally driven dSPE device.
Validated compatibility with commercial polymerase chain reaction (PCR) assays, generating 18-plex STR profiles from purified DNA.

Conclusions:

The laser-actuated valve simplifies microscale valving and overcomes limitations of existing methods.
This approach enhances microfluidic functionality by enabling more integrated unit operations.
The novel valve facilitates the automation of increasingly complex biochemical assays, including DNA analysis.