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  • Ferrofluid plug as valve and actuator for whole-cell PCR on chip

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    Author(s)
    Lok, Khoi Seng
    Kwok, Yien Chian
    Lee, Peter Peng Foo
    Nguyen, Nam-Trung
    Griffith University Author(s)
    Nguyen, Nam-Trung
    Year published
    2012
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    Abstract
    Ferrofluid plug was first used as valve and actuator to circumvent the evaporation of aqueous fluid in LOC. Moreover, this dynamic plug catered for aqueous fluid expansion during its heating in the microchannel. Whole-cell polymerase chain reaction (PCR) protocol was successfully implemented in a magnetically actuated closed-loop PCR microchip system. Here, the ferrofluid plug was used to reduce the evaporation of the PCR sample in the thermal lysis step. A whole-cell PCR model was used to demonstrate this concept. The DNA plasmid, pUC19, was transformed into DH5a competent cells. Primer pairs were designed to amplify region ...
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    Ferrofluid plug was first used as valve and actuator to circumvent the evaporation of aqueous fluid in LOC. Moreover, this dynamic plug catered for aqueous fluid expansion during its heating in the microchannel. Whole-cell polymerase chain reaction (PCR) protocol was successfully implemented in a magnetically actuated closed-loop PCR microchip system. Here, the ferrofluid plug was used to reduce the evaporation of the PCR sample in the thermal lysis step. A whole-cell PCR model was used to demonstrate this concept. The DNA plasmid, pUC19, was transformed into DH5a competent cells. Primer pairs were designed to amplify region of interest in pUC19. The transformants were cultured and selected. Whole-cell PCR was performed on intact bacteria to screen for the presence of pUC19, containing the region of interests. Serial dilutions demonstrated the limit of detection for this system to be four bacterial cells. PCR amplifications were verified with regular thermocyclers and results were comparable.
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    Journal Title
    Sensors and Actuators B: Chemical
    Volume
    166-167
    DOI
    https://doi.org/10.1016/j.snb.2012.03.001
    Copyright Statement
    © 2012 Elsevier B.V.. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Atomic, molecular and optical physics
    Analytical chemistry
    Instrumental methods (excl. immunological and bioassay methods)
    Materials engineering
    Microelectromechanical systems (MEMS)
    Publication URI
    http://hdl.handle.net/10072/50212
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    • Journal articles

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