A long period grating-based platform for the detection of E. coli proteins

R. B. Queirós; C. Gouveia; J. R. A. Fernandes; P. V. S. Marques; J. P. Noronha; M. G. F. Sales; P. A. S. Jorge

doi:10.1117/12.2025811

18 November 2013 A long period grating-based platform for the detection of E. coli proteins

R. B. Queirós, C. Gouveia, J. R. A. Fernandes, P. V. S. Marques, J. P. Noronha, M. G. F. Sales, P. A. S. Jorge

Proceedings Volume 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications; 8785EY (2013) https://doi.org/10.1117/12.2025811
Event: 8th Ibero American Optics Meeting/11th Latin American Meeting on Optics, Lasers, and Applications, 2013, Porto, Portugal

Abstract

A Long Period Grating (LPG)-based platform for the detection of E. coli outer membranes proteins (EcOMPs) is presented. The sensing probe is achieved by the functionalization of a LPG inscribed in a single mode fiber (SMF28) with a DNA-aptamer resulting in a label-free configuration capable of specific recognize EcOMPs in waters. Measurement takes place by tracking the variations induced in the resonance wavelength by the refractive index changes at the fiber surface (≈100 nm/RIU). The sensing head was characterized and tested against EcOMPs and applied to spiked environmental water samples. The sensor displayed logarithmic responses in the range of 0.1 nM to 10 nM EcOMPs and is regenerated (under low pH conditions) and the deviation of the subsequent detection was less than 0.1 %.

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R. B. Queirós, C. Gouveia, J. R. A. Fernandes, P. V. S. Marques, J. P. Noronha, M. G. F. Sales, and P. A. S. Jorge "A long period grating-based platform for the detection of E. coli proteins", Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 8785EY (18 November 2013); https://doi.org/10.1117/12.2025811

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KEYWORDS

Sensors

Proteins

Water

Cladding

Refractive index

Head

Temperature metrology

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