Portable self-flowing platform for filtration separation of samples

Area of Science:

• Biotechnology and Biomedical Engineering
• Microfluidics and Lab-on-a-Chip Technology
• Separation Science

Background:

• Existing filtration and separation methods often require large sample volumes and complex equipment.
• There is a need for portable, efficient, and low-volume platforms for sample processing.
• Microfluidic devices offer potential for miniaturized and rapid sample analysis.

Purpose of the Study:

• To design and validate a portable self-flow filtration and separation platform.
• To assess the platform's efficiency in separating various components from diverse sample types.
• To evaluate the potential for pathogen detection using the microfluidic device.

Main Methods:

• Soft lithography was employed to fabricate a polydimethylsiloxane (PDMS) microfluidic channel cover.
• The microfluidic device utilizes microbeads for universal filtration and separation.
• A vacuum pressure of 760 torr drives sample flow through the 20 μl capacity platform.

Main Results:

• Achieved 99.98% separation efficiency for blood samples with 20-25% hematocrit.
• Demonstrated near 100% separation of fat globules from raw milk.
• Successfully filtered impurities from juice and stool samples, with E. coli detection ranging from 68.18% to 81.21%.

Conclusions:

• The developed portable microfluidic platform provides efficient and rapid filtration and separation capabilities.
• The device shows versatility across various sample types, including biological fluids and complex mixtures.
• This technology holds promise for point-of-care diagnostics and sample preparation applications.