Microfluidic Cell Separation by 2-dimensional Dielectrophoresis

被引：28
作者：
De Gasperis G. [1 ,2 ]
Yang J. [1 ]
Becker F.F. [1 ]
Gascoyne P.R.C. [1 ]
Wang X.-B. [1 ]
机构：
[1] Department of Molecular Pathology, Box 89, Univ. Texas MD Anderson Cancer Ctr., Houston, TX 77030
[2] Parco Sci. e Tecnologico d'Abruzzo, Centro Integrazione Microsistemi, 67100 L'Aquila
来源：
Biomedical Microdevices | 1999年 / 2卷 / 1期
基金：
美国国家卫生研究院;
关键词：
Cell sorting; Computer microvision; Filed-flow-fractionation; Travelling wave dielectrophoresis;
D O I：
10.1023/A:1009955200029
中图分类号：
学科分类号：
摘要：
We describe a microfluidic device for separating cells according to their dielectric properties by combining 2-dimensional dielectrophoretic forces with fleld-flow-fractionation. The device comprises a thin chamber in which a travelling-wave electrical field is generated by a planar, multilayer microelectrode array at the bottom. Under the balance of gravitational and dielectrophoretic levitation forces, cells introduced into the device are positioned at different equilibrium heights in a velocity profile established inside the chamber, and thereby transported at different velocities by the fluid. Simultaneously, cells are subjected to a horizontal travelling-wave dielectrophoretic force that deflects them across the flow stream. The 2-dimensional dielectrophoretic forces acting on cells and the associated velocities in the fluid-flow and travelling-field directions depend sensitively on cell dielectric properties. The responses of cultured MDA-435 human breast cancer, HL-60 human leukemia and DS19 murine erythroleukemia cells, and of peripheral blood mononuclear (PBMN) cells were studied as functions of the frequency and voltage of the applied electric signals, and of the fluid flow rate. Significant differences were observed between the responses of different cell types. Cell separation was demonstrated by the differential redistribution of MDA-435 and PBMN cells as they flowed through the device. The device can be readily integrated with other microfluidic components for microscale sample preparation and analysis.
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页码：41 / 49
页数：8
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