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    Real time hybridization studies by resonant waveguide gratings using nanopattern imaging for Single Nucleotide Polymorphism detection

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    Type
    Article
    Authors
    Bougot-Robin, Kristelle
    Kodzius, Rimantas cc
    Yue, Weisheng
    Chen, Longqing
    Li, Shunbo
    Zhang, Xixiang cc
    Bénisty, Henri
    Wen, Weijia
    KAUST Department
    Advanced Nanofabrication, Imaging and Characterization Core Lab
    Computational Bioscience Research Center (CBRC)
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Core Labs
    KAUST-HKUST Micro/Nanofluidic Joint Laboratory
    Material Science and Engineering Program
    Nanofabrication Core Lab
    Physical Science and Engineering (PSE) Division
    Date
    2013-12-20
    Online Publication Date
    2013-12-20
    Print Publication Date
    2014-04
    Permanent link to this record
    http://hdl.handle.net/10754/563155
    
    Metadata
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    Abstract
    2D imaging of biochips is particularly interesting for multiplex biosensing. Resonant properties allow label-free detection using the change of refractive index at the chip surface. We demonstrate a new principle of Scanning Of Resonance on Chip by Imaging (SORCI) based on spatial profiles of nanopatterns of resonant waveguide gratings (RWGs) and its embodiment in a fluidic chip for real-time biological studies. This scheme allows multiplexing of the resonance itself by providing nanopattern sensing areas in a bioarray format. Through several chip designs we discuss resonance spatial profiles, dispersion and electric field distribution for optimal light-matter interaction with biological species of different sizes. Fluidic integration is carried out with a black anodized aluminum chamber, advantageous in term of mechanical stability, multiple uses of the chip, temperature control and low optical background. Real-time hybridization experiments are illustrated by SNP (Single Nucleotide Polymorphism) detection in gyrase A of E. coli K12, observed in evolution studies of resistance to the antibiotic ciprofloxacin. We choose a 100 base pairs (bp) DNA target (∼30 kDa) including the codon of interest and demonstrate the high specificity of our technique for probes and targets with close affinity constants. This work validates the safe applicability of our unique combination of RWGs and simple instrumentation for real-time biosensing with sensitivity in buffer solution of ∼10 pg/mm2. Paralleling the success of RWGs sensing for cells sensing, our work opens new avenues for a large number of biological studies. © 2013 Springer Science+Business Media.
    Sponsors
    The authors acknowledge L. Wang, X. Xiao, Boon S. Ooi, Q. Zhang and R. H. Austin for fruitful discussion. We thank as well HKUST Nanofabrication facilities staff for their help in chip fabrication process. The electron beam lithography project is supported by University Grants Committee reference SEG_HKUST10. The project is supported by RGC grant number 674710, as well as grant RPC11SC01.
    Publisher
    Springer Nature
    Journal
    Biomedical Microdevices
    DOI
    10.1007/s10544-013-9832-2
    PubMed ID
    24357005
    ae974a485f413a2113503eed53cd6c53
    10.1007/s10544-013-9832-2
    Scopus Count
    Collections
    Nanofabrication Core Lab; Articles; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; Computational Bioscience Research Center (CBRC); Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

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