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Microfluidic Chips Controlled with Elastomeric Microvalve Arrays
Published on: October 1, 2007
New valve and bonding designs for microfluidic biochips containing proteins
Chunmeng Lu1, Yubing Xie, Yong Yang
1Department of Chemical and Biomolecular Engineering, Nanoscale Science and Engineering Center for Affordable Nanoengineering of Polymeric Biomedical Devices, The Ohio State University, Columbus, Ohio 43210, USA.
Analytical Chemistry
|February 1, 2007
Summary
This study introduces novel methods for microfluidic biochip fabrication, addressing protein binding and denaturation. A superhydrophobic "fishbone" microvalve and low-temperature CO2 gas bonding enhance device performance and protein stability.
Area of Science:
- Biotechnology
- Materials Science
- Microfluidics
Background:
- Protein adsorption on microfluidic channels causes nonspecific binding.
- Protein denaturation during device assembly compromises biochip functionality.
- Conventional sealing methods pose risks to sensitive biomolecules.
Purpose of the Study:
- To develop innovative solutions for protein binding and denaturation in microfluidic biochips.
- To introduce a novel microvalve design for improved protein blocking.
- To present a gentle, low-temperature packaging method for protein-loaded biochips.
Main Methods:
- A superhydrophobic "fishbone" microvalve design was developed to replace traditional capillary valves.
- CO2 gas-assisted polymer diffusion was employed for low-temperature, low-pressure biochip bonding.
- Experimental validation was performed using a CD-like ELISA device.
Main Results:
- The fishbone microvalve effectively prevented nonspecific protein binding and functioned well in an ELISA device.
- The CO2 gas bonding method achieved robust sealing at low temperatures and pressure.
- The low-temperature bonding preserved the activity of pre-loaded proteins.
Conclusions:
- The developed fishbone microvalve offers a superior alternative for protein blocking in microfluidic applications.
- CO2 gas-assisted bonding provides a biomolecule-compatible method for microfluidic biochip packaging.
- These advancements significantly improve the reliability and performance of microfluidic biochips.
