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A Microfluidic-based Hydrodynamic Trap for Single Particles
Published on: January 21, 2011
Hydrophoretic sorting of micrometer and submicrometer particles using anisotropic microfluidic obstacles.
Sungyoung Choi1, Seungjeong Song, Chulhee Choi
1Department of Bio and Brain Engineering, KAIST, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea.
Analytical Chemistry
|January 2, 2009
Summary
A new hydrophoretic device uses rotational flows to separate biological particles and DNA molecules. This sheathless, continuous-flow method offers a novel approach for micro- and nanoscale biological sample preparation.
Area of Science:
- Biotechnology
- Microfluidics
- Biophysics
Background:
- Existing continuous separation devices often struggle with separating macromolecules like DNA.
- Current methods are frequently limited to larger particles (micrometer-sized) due to volume-dependent physical fields.
- Hydrodynamic separation of nanoscale biological materials remains a significant challenge.
Purpose of the Study:
- To introduce a novel hydrophoretic device for biological sample preparation.
- To demonstrate the separation capabilities for a range of particle sizes, including DNA molecules.
- To highlight the advantages of continuous flow and sheathless operation in micro/nanoscale separations.
Main Methods:
- Development of a hydrophoretic device utilizing patterned obstacles on a single wall to induce rotational flows.
- Exploitation of anisotropic obstacles to generate hydrodynamic forces for particle manipulation.
- Utilizing two distinct hindrance mechanisms for differential trajectory separation.
Main Results:
- Successful separation of micrometer and submicrometer beads into distinct trajectories.
- Demonstrated separation of DNA molecules, showcasing capability for nanoscale biological materials.
- Achieved continuous separation of various biological particles without sheath flow.
Conclusions:
- The developed hydrophoretic device effectively separates diverse biological particles, from micrometer beads to DNA molecules.
- Hydrophoresis offers a promising, sheathless, and continuous method for micro- and nanoscale biological sample preparation.
- The device's reliance on purely hydrodynamic principles overcomes limitations of volume-dependent separation techniques.
