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Anal Bioanal Chem. 2011 Oct;401(7):2103-11. doi: 10.1007/s00216-011-5284-9. Epub 2011 Aug 4.

Blood cell capture in a sawtooth dielectrophoretic microchannel.

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Department of Chemistry and Biochemistry and Center for Solid State Electronics Research, Arizona State University, PO Box 871604, Tempe, AZ 85287, USA.


Biological fluids can be considered to contain information-rich mixtures of biochemicals and particles that enable clinicians to accurately diagnose a wide range of pathologies. Rapid and inexpensive analysis of blood and other bodily fluids is a topic gaining substantial attention in both science and medicine. One line of development involves microfluidic approaches that provide unique advantages over entrenched technologies, including rapid analysis times, microliter sample and reagent volumes, potentially low cost, and practical portability. The present study focuses on the isolation and concentration of human blood cells from small-volume samples of diluted whole blood. Separation of cells from the matrix of whole blood was accomplished using constant potential insulator-based gradient dielectrophoresis in a converging, sawtooth-patterned microchannel. The channel design enabled the isolation and concentration of specific cell types by exploiting variations in their characteristic physical properties. The technique can operate with isotonic buffers, allowing capture of whole cells, and reproducible capture occurred at specific locales within the channel over a global applied voltage range of 200-700 V.

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