A plug-in electrophoresis microchip with PCB electrodes for contactless conductivity detection

Area of Science:

• Analytical Chemistry
• Microfluidics
• Biotechnology

Background:

• Traditional electrophoresis microchips often involve discarding the entire unit due to damage in specific layers, leading to increased waste and costs.
• Fabrication of microchips typically requires complex processes like photolithography and metal deposition, contributing to high manufacturing expenses.
• Maintenance and repair of existing microchip devices can be challenging, often necessitating the disconnection of delicate circuitry.

Purpose of the Study:

• To propose a novel plug-in electrophoresis microchip designed for large-scale use.
• To improve device maintainability and reduce fabrication and maintenance costs.
• To assess the detection performance and the impact of structural shifts on the new microchip design.

Main Methods:

• Development of a plug-in microchip structure allowing for easy replacement of the microchannel layer without disrupting electrical connections.
• Utilization of a steel template and printed circuit board electrodes to simplify fabrication and reduce costs, avoiding complex lithography and deposition techniques.
• Evaluation of the microchip's detection performance through electrophoresis experiments and assessment of the impact of installation shifts between layers.

Main Results:

• The plug-in microchip demonstrated acceptable gradient and stable detection performance in electrophoresis experiments.
• The simplified fabrication process using a steel template and PCB electrodes significantly reduced manufacturing costs.
• The study found that installation shifts between the microchannel and electrode layers have an acceptable impact on performance within a reasonable range.

Conclusions:

• The developed plug-in electrophoresis microchip offers a viable solution for large-scale applications by enhancing maintainability and reducing costs.
• The modular design minimizes waste by allowing replacement of only the damaged microchannel layer.
• This innovation provides a new direction for the design and large-scale implementation of portable electrophoresis microchip instruments.