Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 292, Issue -, Pages 314-320Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.03.144
Keywords
Immunosensor; Cyclic voltammetry; E. coli; Nanoparticles
Funding
- Direction Generale de l'Armement (DGA, Ministere de la Defense, France) [2014017]
- Region Aquitaine (France)
- LOMA
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To face the emerging issues raised by bacterial infections in biomedical, food and environmental contexts, the combination of nanotechnologies and biosensors characteristics is increasingly seen as a promising tool to develop rapid, highly sensitive and specific devices for reliable bacterial detection and quantification. We present here the design of an electrochemical immuno-biosensor, integrating non cytotoxic silica nanoparticles (NPs), in a two-step spin coating process. Unlike biosensors that integrate a unique antibody-based layer without NPs, this new tool allows, through cyclic voltammetry measurements, the continuous and non-saturated detection of E. coll. bacteria in only 5 min. and can reach up to 10(3) CFU/mL in 30 min. It offers great promises for industrial purposes as electrode functionalization is rather simple and its architecture can be tuned on demand to target a variety of micro-organisms, and the highlighted indicators (variations of current intensity, intensity ratios and/or difference of potentials) can easily be implemented in a screen displayed packaging.
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