Employing electrochemically derived pH gradients for Lab-on-PCB protein preconcentration devices

Area of Science:

• Analytical Chemistry
• Biotechnology
• Materials Science

Background:

• Protein preconcentration is crucial for analyzing low-concentration samples like bodily fluids and wastewater.
• Existing miniaturized preconcentration methods often require chemical reagents and are difficult to integrate into microanalytical systems.
• There is a need for reagent-free, integrated solutions for protein preconcentration.

Purpose of the Study:

• To develop a novel miniaturized protein preconcentration device utilizing isoelectric focusing.
• To implement electrochemically derived pH gradients, avoiding chemical reagents.
• To demonstrate the integration of this device into a Lab-on-PCB (Printed Circuit Board) microsystem.

Main Methods:

• Utilized a Lab-on-PCB approach to control solution pH via electrochemical acid generation.
• Employed a printed circuit board with gold electrodes functionalized with 4-aminothiophenol and electropolymerized for enhanced reversibility.
• Tested protein preconcentration in both open and microfluidic channel configurations.

Main Results:

• Achieved protein preconcentration using electrochemically generated pH gradients, eliminating chemical reagents.
• Demonstrated quantitative concentration factors in the open configuration.
• Provided qualitative proof of concept for preconcentration within microfluidic channels.

Conclusions:

• The developed device offers a reagent-free, miniaturized solution for protein preconcentration.
• The Lab-on-PCB integration facilitates the creation of seamless, fully integrated protein analysis microsystems.
• This technology holds promise for advancing microanalytical techniques in various fields, including diagnostics and environmental monitoring.