Abstract
Genetic analysis is considered to be the ultimate diagnostic approach in many fields, e.g., in medicine for disease detection, in agricultural technology for food and feed authentication, in forensics, to name a few. Consequently, great interest is growing in developing sensitive and reliable analytical tools (biosensors) to identify whole DNA sequences, oligonucleotide fragments, or single-nucleotide polymorphisms (SNPs). In addition, these biosensors are becoming vital tools for clinical diagnosis and point-of-care systems. They need to be of high sensitivity, high specificity, fast response, inexpensive, and easy to use. In this work, we discuss a surface-plasmon fluorescence grating coupler-based biosensor, fabricated on polymer substrates, and with a designed surface binding procedure that offers the direct response required for a sensor to be implemented in a disposable system. These gratings fabricated on polymer substrates using an embossing technique showed excellent and reproducible resonance coupling results. We also present a monitoring protocol for hybridization reactions based on fluorescence resonance energy transfer (FRET) to quench the bulk solution contribution that decreases the sensitivity of the grating biosensors.
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Acknowledgements
This work was performed with the support of CEST Competence Centre for Electrochemical Surface Technology, the AIT Austrian Institute of Technology, and the British University in Egypt, BUE.
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AK fabricated the disposable polymer gratings, measured the SPFS on gratings, designed the Anti-DNA, and performed the FRET measurements in the bulk and on the surface. AN fabricated the Master grating and measured the affinities between the DNA on the grating surface. Both AK and AN worked under the supervision of WK. The manuscript was written through contributions of all the authors. All the authors have given approval to the final version of the manuscript.
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Kasry, A., Nicol, A. & Knoll, W. Grating-coupled surface-plasmon fluorescence DNA sensor. Appl. Phys. B 127, 68 (2021). https://doi.org/10.1007/s00340-021-07619-4
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DOI: https://doi.org/10.1007/s00340-021-07619-4