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Sensors 2018, 18(9), 2941; https://doi.org/10.3390/s18092941

Development of Coplanar Electro-Wetting Based Microfluidic Sorter to Select Micro-Particles in High Volume Throughput at Milliliter Amount within Twenty Minutes

1
and
1,2,3,*
1
Department of Chemistry and Biochemistry, National Chung Cheng University, Chia-Yi 621, Taiwan
2
Center for Nano Bio-detections, Advanced Institute of Manufacturing with High-tech Innovations (AIM-HI), National Chung Cheng University, Chia-Yi 621, Taiwan
3
Center for Innovative Research on Aging Society (CIRAS), National Chung Cheng University, Chia-Yi 621, Taiwan
*
Author to whom correspondence should be addressed.
Received: 21 July 2018 / Revised: 28 August 2018 / Accepted: 1 September 2018 / Published: 4 September 2018
(This article belongs to the Section Biosensors)
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Abstract

This paper reports the work of developing one coplanar microfluidic sorter while using the electro-wetting on dielectrics (EWOD) technique. When connected with delivery capillary to receive sample solution containing micro-particles, this device can select about 10 micro-particles in high volume throughput of milliliter amount within 20 min, to potentially match the requirement of efficiently determining the low amounts of bacteria in concentrated food and environmental samples, of which the typical bacteria density is 10 colony forming unit or less, much smaller than that of clinical pathogen samples. This coplanar T-shape EWOD device contains two fluidic channels, one inlet channel and the other collection channel stemmed from the middle of inlet channel. When the solution droplet falls from the delivery capillary to the entrance end of inlet channel, the droplet is driven to the intersection of two channels. The droplet containing fluorescent particle will be diverted to the lower channel to collect. Otherwise, the non-fluorescent droplet keeps moving toward the other end of inlet channel to waste zone. The particle fluorescence is collected through microscope lens to detect with one photomultiplier tube. The detected signals trigger the personal computer control board to active each EWOD electrode to direct the droplet moving directions. When the solution of 1 mL containing about 10 fluorescent micro-particles is delivered into this sorting device, nearly all the particles were correctly directed into collection zone in 20 min. View Full-Text
Keywords: electrowetting-on-dielectrics; microfluidics; food safety pathogen; fluorescence detection electrowetting-on-dielectrics; microfluidics; food safety pathogen; fluorescence detection
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Chen, Y.; Wang, S. Development of Coplanar Electro-Wetting Based Microfluidic Sorter to Select Micro-Particles in High Volume Throughput at Milliliter Amount within Twenty Minutes. Sensors 2018, 18, 2941.

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