Journal
JOURNAL OF MICROBIOLOGICAL METHODS
Volume 58, Issue 3, Pages 387-401Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mimet.2004.05.002
Keywords
dielectrophoresis; electrorotation; traveling wave; levitation; malignant cells
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The study of the dielectric properties of micrometer- or nanometer-scale particles is of particular interest in present-day applications of biomedical engineering. Electrokinetics utilises electrically energised microelectrode structures within microfluidic chambers to noninvasively probe the physiological structure of live cancer cells. A system is described that combines the three complementary techniques of dielectrophoresis (DEP), travelling wave dielectrophoresis (TWD) and electrorotation (ROT) for the first time on a single, integrated chip (3 x 6 mm). The chip employs planar microelectrode arrays fabricated on a silicon substrate to facilitate the synthesis of the various nonuniform electric fields required for the controlled manipulation, measurement and characterization of mammalian cells. A study of the dielectric properties of human malignant cells (Daudi and NCI-H929) was performed to demonstrate the potential and the versatility of the system in providing a fully programmable microsystem. (C) 2004 Elsevier B.V. All rights reserved.
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