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18 August 2000 Flow-type electroporation chips for gene transfection
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Proceedings Volume 4177, Microfluidic Devices and Systems III; (2000)
Event: Micromachining and Microfabrication, 2000, Santa Clara, CA, United States
Electroporation is a technique with which DNA molecules can be delivered into cells in a chamber using high electric field pulses. The limited amount of target cells and the potential risk from the high voltage are the two drawbacks in this technique. This study aimed to fabricate an electroporation chip to manage large amount of cells continuously with a lower applied voltage. The electroporation chip, consisting of a micro-channel with thin film electrodes made of gold or platinum wire electrodes on both sides, was fabricated on PMMA material using evaporation, photolithography, wet- etching, lift-off, and fusion-bonding methods. The suspension fluid of Huh-7 cell lines (1 x 106 cells/ml) mixed with 10 micrometers plasmids equipped with lacZ genes in a volume of 500 (mu) l flowed through the channel with a variety of flow rates under a series of square pulses. The transfection rate was evaluated with blue-staining cells under X-Gal stain 24 hours later. The dimensions of the channel were 5 mm wide, 0.2 mm high, and 25 mm long. Two types of electrodes, parallel-plate type and parallel-line type electrodes, were fabricated and tested in these experiments. The fabricated microchip can deliver genes into the flowing of cells. The electric pulse frequency that determines the shock number for each cell for a fixed flow rate can be optimized for better transfection and survival rates.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yu-Cheng Lin, Chung-Min Jen, Ming-Yuan Huang, and Xi-Zhang Lin "Flow-type electroporation chips for gene transfection", Proc. SPIE 4177, Microfluidic Devices and Systems III, (18 August 2000);

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