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Infrared controlled waxes for liquid handling and storage on a CD-microfluidic platform
Abi-Samra, Kameel,Hanson, Ryan,Madou, Marc,Gorkin III, Robert A. Royal Society of Chemistry 2011 Lab on a chip Vol.11 No.4
<P>A novel active valving technique, whereby paraffin wax plugs in microchannels on a centrifugal microfluidic platform are actuated using focused infrared (IR) radiation is demonstrated in this report. Microchannels were simultaneously or sequentially opened using a stationary IR source by forming wax plugs with similar or differing melting points. The presented wax plugs offer key advantages over current active valving techniques, including a less involved fabrication procedure, a simpler actuation process, and the ability to multiplex experiment with active valves. In addition, a new technique for automated liquid reagent storage and release on the microfluidic disc platform, based on the formation and removal of a wax layer, is demonstrated. Overall, the techniques presented in this report offer novel methods for liquid handling, separation, and storage on the centrifugal microfluidic disc platform.</P> <P>Graphic Abstract</P><P>Novel fluid handling and storage techniques for the centrifugal microfluidic disc platform based on non-contact actuation of paraffin wax plugs <I>via</I> infrared radiation. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0lc00160k'> </P>
Flow-enhanced electrochemical immunosensors on centrifugal microfluidic platforms.
Kim, Tae-Hyeong,Abi-Samra, Kameel,Sunkara, Vijaya,Park, Dong-Kyu,Amasia, Mary,Kim, Nahui,Kim, Jintae,Kim, Hanshin,Madou, Marc,Cho, Yoon-Kyoung Royal Society of Chemistry 2013 Lab on a chip Vol.13 No.18
<P>We present a novel fully integrated centrifugal microfluidic device with features for target antigen capture from biological samples, via a bead-based enzyme-linked immune-sorbent assay, and flow-enhanced electrochemical detection. The limit of detection (LOD) of our device for the C-reactive protein (CRP) was determined to be 4.9 pg mL(-1), a 17-fold improvement over quantification by optical density. The complete sample-to-answer protocol of our device is fully automated and takes less than 20 min. Overall, the presented microfluidic disc adds to the comparatively small number of fully integrated microfluidic-based platforms that utilize electrochemical detection and exemplifies how electrochemical detection can be enhanced by flow to successfully detect very low levels of biomarkers (e.g. pg mL(-1)).</P>