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High-throughput electrokinetic bioparticle focusing based on a travelling-wave dielectrophoretic field

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Abstract

This study presents a sheathless and portable microfluidic chip that is capable of high-throughput focusing bioparticles based on 3D travelling-wave dielectrophoresis (twDEP). High-throughput focusing is achieved by sustaining a centralized twDEP field normal to the continuous through-flow direction. Two twDEP electrode arrays are formed from upper and lower walls of the microchannel and extend to its center, which induce twDEP forces to provide the lateral displacements in two directions for focusing the bioparticles. Bioparticles can be focused to the center of the microchannel effectively by twDEP conveyance when the characteristic time due to twDEP conveying in the y direction is shorter than the residence time of the particles within twDEP electrode array. Red blood cells can be effectively focused into a narrow particle stream (~10 μm) below a critical flow rate of 10 μl/min (linear flow velocity ~5 mm/s), when under a voltage of 14 Vp–p at a frequency of 500 kHz is applied. Approximately 90% focusing efficiency for red blood cells can be achieved within two 6-mm-long electrode arrays when the flow rate is below 12 μl/min. Blood cells and Candida cells were also focused and sorted successfully based on their different twDEP mobilities. Compared to conventional 3D-paired DEP focusing, velocity is enhanced nearly four folds of magnitude. 3D twDEP provides the lateral displacements of particles and long residence time for migrating particles in a high-speed continuous flow, which breaks through the limitation of many electrokinetic cell manipulation techniques.

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Acknowledgments

This study was supported by the Multidisciplinary Center of Excellence for Clinical Trial and Research (DOH99-TD-B-111-102), Department of Health, Executive Yuan, Taiwan (DOH99-TD-N-111-010), NCKU Project for Promoting Academic Excellence & Developing World Class Research Centers (R017), the NSC under Grant No. 96-2628-B-006-010 MY3 and NSC 97-2218-E-006-004. We also thank National Nano Device Laboratory and Southern Taiwan Nanotechnology Research Center for supplying microfabrication equipment.

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Authors and Affiliations

  1. Institute of Nanotechnology and Microsystems Engineering, National Cheng Kung University, Tainan, Taiwan

    I-Fang Cheng, Cheng-Che Chung & Hsien-Chang Chang

  2. Institute of Biomedical Engineering, National Cheng Kung University, Tainan, Taiwan

    Hsien-Chang Chang

  3. Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan, Taiwan

    Hsien-Chang Chang

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  1. I-Fang Cheng
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  2. Cheng-Che Chung
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  3. Hsien-Chang Chang
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Correspondence to Hsien-Chang Chang.

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Cheng, IF., Chung, CC. & Chang, HC. High-throughput electrokinetic bioparticle focusing based on a travelling-wave dielectrophoretic field. Microfluid Nanofluid 10, 649–660 (2011). https://doi.org/10.1007/s10404-010-0699-8

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  • DOI: https://doi.org/10.1007/s10404-010-0699-8

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