Journal Reference
Sensors and Actuators B: Chemical, Volume 223, February 2016, Pages 295–300 .
Marisa Manzano1, Priya Vizzini1,Kun Jia2,3,Pierre-Michel Adam2,Rodica Elena Ionescu2
[expand title=”Show Affiliations”]- Department of Food Science, University of Udine, via Sondrio 2/A, 33100 Udine, Italy
- Laboratoire de Nanotechnologie et d’Instrumentation Optique, Institute Charles Delaunay, Universite’ de Technologie de Troyes, UMR CNRS 6281, 12 Rue Marie-Curie, CS 42060, 10004 Troyes Cedex, France
- School of Microelectronics and Solid-State Electronics, University of Electronic Science and Technology of China, 610054 Chengdu, China
Abstract
Incident light interacting with noble-metal nanoparticles with smaller sizes than the wavelength of the incident light induces localized surface plasmon resonance (LSPR). In this work a gold nanostructured surface was used for the immobilization of a 5′ end Thiol modified DNA probe to develop a LSPR nanobiosensor for the detection of the spoiler wine yeast Brettanomyces bruxellensis. Gold was evaporated to obtain a gold thickness of 4 nm. DNA (2 μL) from the target microorganism and the negative control at various concentrations were used to test the specificity and sensitivity of the LSPR technique. Changes in the optical properties of the nanoparticles due to DNA-probe binding are reflected in the shift of LSPR extinction maximum (λmax). The results obtained using as target microorganism B. bruxellensis, and as negative control Saccharomyces cerevisiae demonstrated the specificity of both the DNA-probe and the protocol. The LSPR spectrophotometry technique detects 0.1 ng/μL DNA target confirming the possibility to utilize this system for the detection of pathogen microorganisms present in low amount in food and beverage samples.
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