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New biochip technology uses tiny whirlpools to corral microbes
Date:1/8/2013

WEST LAFAYETTE, Ind. - Researchers have demonstrated a new technology that combines a laser and electric fields to create tiny centrifuge-like whirlpools to separate particles and microbes by size, a potential lab-on-a-chip system for medicine and research.

The theory behind the technology, called rapid electrokinetic patterning - or REP - has been described in technical papers published between 2008 and 2011. Now the researchers have used the method for the first time to collect microscopic bacteria and fungi, said Steven T. Wereley, a Purdue University professor of mechanical engineering.

The technology could bring innovative sensors and analytical devices for lab-on-a-chip applications, or miniature instruments that perform measurements normally requiring large laboratory equipment. REP is a potential new tool for applications including medical diagnostics; testing food, water and contaminated soil; isolating DNA for gene sequencing; crime-scene forensics; and pharmaceutical manufacturing.

"The new results demonstrate that REP can be used to sort biological particles but also that the technique is a powerful tool for development of a high-performance on-chip bioassay system," Wereley said.

A research paper about the technology was featured on the cover of the Dec. 7 issue of Lab on a Chip magazine, and the work is highlighted as a news item in the Jan. 13 issue of Nature Photonics, posted online Dec. 27. Mechanical engineering doctoral student Jae-Sung Kwon, working extensively with Sandeep Ravindranath, a doctoral student in agricultural and biological engineering, was lead author of the Lab on a Chip paper.

The technology works by using a highly focused infrared laser to heat a fluid in a microchannel containing particles or bacteria. An electric field is applied, combining with the laser's heating action to circulate the fluid in a "microfluidic vortex," whirling mini-maelstroms one-tenth the width of a human ha
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Contact: Emil Venere
venere@purdue.edu
765-494-4709
Purdue University
Source:Eurekalert  

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