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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
biochemistry, genetics and molecular biology
Real time hybridization studies by resonant waveguide gratings using nanopattern imaging for Single Nucleotide Polymorphism detection
Biomedical Microdevices, Volume 16, No. 2, Year 2014
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Description
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.
Authors & Co-Authors
Bougot-Robin, Kristelle
Hong Kong, Hong Kong
Hong Kong University of Science and Technology
Kodzius, Rimantas
Hong Kong, Hong Kong
Hong Kong University of Science and Technology
Saudi Arabia, Thuwal
King Abdullah University of Science and Technology
Yue, Weisheng
Saudi Arabia, Thuwal
King Abdullah University of Science and Technology
Chen, Longqing
Saudi Arabia, Thuwal
King Abdullah University of Science and Technology
Shunbo Li, Shunbo
Hong Kong, Hong Kong
Hong Kong University of Science and Technology
Zhang, Xixiang
Saudi Arabia, Thuwal
King Abdullah University of Science and Technology
Benisty, Henri
France, Palaiseau
Laboratoire Charles Fabry
Wen, Weijia
Hong Kong, Hong Kong
Hong Kong University of Science and Technology
Statistics
Citations: 8
Authors: 8
Affiliations: 3
Identifiers
Doi:
10.1007/s10544-013-9832-2
ISSN:
13872176
e-ISSN:
15728781
Research Areas
Genetics And Genomics