On-chip connector valve for immunoaffinity chromatography in a microfluidic chip

Area of Science:

• Microfluidics
• Biotechnology
• Materials Science

Background:

• Microfluidic devices require precise fluid control.
• Integration of valves into microchips often necessitates complex fabrication.
• Existing connectors can be bulky and difficult to implement.

Purpose of the Study:

• To develop a miniature, easily integrated valve for microfluidic applications.
• To create an on-chip connector valve that simplifies microchip design.
• To demonstrate the valve's functionality in a relevant biochemical assay.

Main Methods:

• A novel rotor valve design using Teflon (3 mm diameter, 1.5 mm height) was engineered.
• The valve utilizes a central hole and a radial groove for fluidic connection.
• The valve was integrated into a glass microchip with an offset chip port and tube fitting.
• Pressure resistance testing was performed, and immunoaffinity chromatography was conducted.

Main Results:

• The developed valve demonstrated effective on/off fluidic control between the chip port and tubing.
• The valve exhibited a pressure resistance of at least 1.0 MPa.
• No modifications to the glass microchip fabrication process were required for valve integration.
• Successful application in immunoaffinity chromatography of a fluorescence-labeled recombinant antibody fragment was achieved.

Conclusions:

• The on-chip connector valve offers a simple and effective solution for fluid control in microfluidic devices.
• Its design allows for straightforward integration without altering existing microchip fabrication.
• The valve's performance in chromatography validates its utility in complex biochemical analyses.