Enhancing size based size separation through vertical focus microfluidics using secondary flow in a ridged
Bushra Tasadduq1,2, Wilbur Lam3, Alexander Alexeev4
1School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, USA.
Scientific Reports
|December 14, 2017
Summary
This study introduces a novel 3D microfluidic focusing technique for high-throughput particle and cell sorting. The method significantly enhances purity for both small and large particles, improving biomedical applications.
Area of Science:
- Biomedical Engineering
- Microfluidics
- Cell Biology
Background:
- High-throughput size-based separation of bioparticles and cells is vital for medical diagnostics and pharmaceutical purification.
- Current microfluidic sorting methods face challenges in achieving high purity and homogeneous cell subpopulations.
- Optimizing particle positioning is key to enhancing the efficiency of size-based separation.
Purpose of the Study:
- To develop and validate a novel microfluidic sorting device utilizing three-dimensional (3D) focusing.
- To amplify size-dependent particle trajectory differences by leveraging secondary flows.
- To improve the purity and yield of sorted particle and cell populations.
Main Methods:
- Implementation of a 3D focusing mechanism within a microfluidic channel.
- Simulation and experimental analysis of particle trajectories under focused and unfocused flow conditions.
- Continuous-flow sorting of millions of particles and cells per minute without pre- or post-processing.
Main Results:
- Achieved a 35-fold increase in purity for small particles and an 8-fold increase for large particles compared to unfocused flow.
- Demonstrated the effectiveness of 3D particle positioning in enhancing size-dependent lateral movement in microchannels with secondary flows.
- Successfully applied the technique for improved enrichment and recovery of white blood cells from human blood samples.
Conclusions:
- 3D focusing in microfluidics is a powerful strategy to amplify size-dependent particle separation.
- This novel technique offers high-throughput, continuous-flow sorting with significant improvements in purity.
- The method has broad applicability in biomedical processing, diagnostics, and pharmaceutical purification.
