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Cross-Contamination Avoidance for Droplet Routing in Digital Microfluidic Biochips

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2 Author(s)
Yang Zhao ; Adv. Micro Devices, Inc., Sunnyvale, CA, USA ; Chakrabarty, K.

Recent advances in digital microfluidics have enabled droplet-based biochip devices for DNA sequencing, immunoassays, clinical chemistry, and protein crystallization. Since cross-contamination between droplets of different biomolecules can lead to erroneous outcomes for bioassays, the avoidance of cross-contamination during droplet routing is a key design challenge for biochips. We propose a droplet-routing method that avoids cross-contamination in the optimization of droplet flow paths. The proposed approach targets disjoint droplet routes and synchronizes wash-droplet routing with functional droplet routing, in order to reduce the duration of droplet routing while avoiding the cross-contamination between different droplet routes. In order to avoid cross-contamination between successive routing steps, an optimization technique is used to minimize the number of wash operations that must be used between successive routing steps. Two real-life biochemical applications are used to evaluate the proposed droplet-routing methods.

Published in:

Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:31 ,  Issue: 6 )

Date of Publication:

June 2012

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