Microfluidic diafiltration-on-chip using an integrated magnetic peristaltic micropump.

Area of Science:

• Biomaterials Science
• Microfluidics
• Biotechnology

Background:

• Diafiltration is a membrane filtration method for purifying biomaterials.
• Traditional diafiltration systems require large sample volumes (>10 mL), limiting their use for low-volume applications.
• Automating diafiltration for biomaterial purification has been challenging due to equipment size and dead volume.

Purpose of the Study:

• To develop a microfluidic diafiltration device for processing small sample volumes (50 μL).
• To overcome the limitations of conventional diafiltration systems in biomaterial purification.
• To demonstrate the device's capability for high-purity separation of biomaterials and cells.

Main Methods:

• Development of a compact diafiltration-on-a-chip device featuring a magnetically-driven on-chip peristaltic pump.
• Utilizing a low dead volume (<50 μL) system capable of processing samples as small as 50 μL.
• Demonstrating parallel processing by integrating four diafiltration systems onto a single chip.

Main Results:

• Achieved >99% purity and >96% retention of microbeads from dye within two hours.
• Successfully purified cells from microbeads with >97% purity and >97% retention in two hours.
• Demonstrated efficient fluid flow up to 50 mL h^-1 with minimal external instrumentation.

Conclusions:

• The developed diafiltration-on-a-chip device enables efficient purification of biomaterials and cells from low-volume samples.
• The system's low dead volume and minimal instrumentation facilitate automation and parallelization.
• This technology holds promise for various applications in biomaterial processing and cell purification.