Nano Archive

A DNA trapping and extraction microchip using periodically crossed electrophoresis in a micropillar array

Yi, Soyeon and Seo, Kyoung-Sun and Cho, Young-Ho (2005) A DNA trapping and extraction microchip using periodically crossed electrophoresis in a micropillar array. Sensors and Actuators A: Physical, 120 (2). 429 - 436.

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This paper presents an integrated deoxyribose nucleic acid (DNA) trapping and extraction microchip based on the electrophoresis using periodically crossed electric fields in the micropillar array. The extraction microchip, integrated with a micropillar array, microchannels, nano-gap entropic barriers, loading and unloading windows, has been fabricated by a 3-mask microfabrication process. Using the electric field crossed at 120°, the microchip is designed to trap the DNA molecules, whose reorientation time is longer than the period of the crossed field, within the micropillars distributed at 60° direction. In the fabricated extraction microchip, three different DNA molecules, including λ DNA (48.5 kbp), micrococcus DNA (115 kbp) and T4 DNA (168.9 kbp) show the reorientation times of 4.80 ± 0.44 s, 7.12 ± 0.75 s and 9.71 ± 0.30 s, respectively, at the crossed electric field of 6.25 V/cm. Among three DNA molecules, T4 DNA could not come out of the micropillar array for the electric field of 6.25 V/cm crossed at the period of 10 s. We have demonstrated that the present DNA extraction microchip separates DNA molecules larger than a critical value, which can be adjusted by the period of the electric field across the micropillar array.

Item Type:Article
Uncontrolled Keywords:Bio-separators; Bio-extractors; Electrophoresis; Crossed electric field; Micropillars
Subjects:Analytical Science > Nanotechnology for sensing and actuating
Biomedical Science > Nanoscale biological processes
ID Code:4636
Deposited By:SPI
Deposited On:06 Jul 2009 15:22
Last Modified:06 Jul 2009 15:22

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