Oscillatory flow-assisted efficient target enrichment with small volumes of sample by using a particle-based...

Area of Science:

• Biotechnology
• Microfluidics
• Assay Development

Background:

• Efficient target enrichment is crucial for sensitive molecular detection in biological samples.
• Traditional methods often face limitations in mixing efficiency and assay speed.
• Microfluidic devices offer potential for miniaturized and automated biological analyses.

Purpose of the Study:

• To develop and validate an oscillatory flow-assisted method for efficient target enrichment using a particle-based microarray.
• To investigate the impact of oscillatory flow on microparticle-target molecule interactions.
• To demonstrate the method's applicability in a rapid on-chip immunoassay.

Main Methods:

• Utilized a particle-based microarray device with an elastic microvalve structure.
• Implemented periodic oscillating flow to enhance mixing and binding kinetics between target molecules and functionalized microparticles.
• Demonstrated particle trapping, securing, and release mechanisms controlled by flow conditions.

Main Results:

• Achieved over 95% single particle trapping efficiency.
• Oscillatory flow significantly improved target enrichment and detection efficiency compared to static or unidirectional flow.
• Successfully performed an on-chip immunoassay for anti-Zika NS1 antibody detection with a limit of detection (LOD) of 1 ng/mL in 10 minutes using <10 µL of sample.

Conclusions:

• Oscillatory flow-assisted target enrichment provides a highly efficient and rapid method for molecular analysis.
• The particle-based microarray platform enables sensitive detection with minimal sample volume.
• This technology holds promise for point-of-care diagnostics and high-throughput screening applications.