Proceedings (Jan 2019)

Live Tracking Biofunctionalization and Label-Free Protein Detection Performed by a Nanophotonic Biosensor

  • Jad Sabek,
  • Luis Torrijos-Morán,
  • Zeneida Díaz-Betancor,
  • María José Bañuls-Polo,
  • Ángel Maquieira-Catalá,
  • Jaime García-Rupérez

DOI
https://doi.org/10.3390/ecsa-5-05718
Journal volume & issue
Vol. 4, no. 1
p. 15

Abstract

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A label-free biosensor based on silicon-on-insulator (SOI) photonic bandgap (PBG) structures is performed for specific protein detection. First, the SOI sensing surface is functionalized using triethoxyvinylsilane (TEVS) organosilane. Then, a UV light photocatalyzed immobilization of polyclonal half anti-bovine serum albumin (haBSA) antibodies is performed. Finally, a direct detection of target BSA antigen is carried out. Both the immobilization and the detection steps are monitored by making a continuous tracking of the PBG edge shift. In order to confirm the recognition of the antigen by the immobilized antibody, a fluorophore-labelled secondary antibody was flowed at the end of the experiment in order to perform a confirmation fluorescence test after the photonic detection.

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