title: Surface plasmon resonance immunosensor for bacteria detection.
abstract: This work describes an approach for the development of two bacteria biosensors based on surface plasmon resonance (SPR) technique. The first biosensor was based on functionalized gold substrate and the second one on immobilized gold nanoparticles. For the first biosensor, the gold substrate was functionalized with acid-thiol using the self-assembled monolayer technique, while the second one was functionalized with gold nanoparticles immobilized on modified gold substrate. A polyclonal anti-Escherichia coli antibody was immobilized for specific (E. coli) and non-specific (Lactobacillus) bacteria detection. Detection limit with a good reproducibility of 10(4) and 10(3) cfu mL(-1) of E. coli bacteria has been obtained for the first biosensor and for the second one respectively. A refractive index variation below 5x10(-3) due to bacteria adsorption is able to be detected. The refractive index of the multilayer structure and of the E. coli bacteria layer was estimated with a modeling software.
authors.affiliation: Nanotechnology Laboratory, INSAT, Centre Urbain Nord, Charguia, Tunisia.
authors.forename: H
authors.initials: H
authors.lastname: Baccar
authors.forename: M B
authors.initials: MB
authors.lastname: Mejri
authors.forename: I
authors.initials: I
authors.lastname: Hafaiedh
authors.forename: T
authors.initials: T
authors.lastname: Ktari
authors.forename: M
authors.initials: M
authors.lastname: Aouni
authors.forename: A
authors.initials: A
authors.lastname: Abdelghani
mesh_terms: D001419:Bacteria / Q000737:chemistry* / Q000145:classification / Q000166:cytology*; D015374:Biosensing Techniques; D006046:Gold / Q000737:chemistry; D007163:Immunosorbent Techniques / Q000295:instrumentation; D057230:Limit of Detection; D053758:Nanoparticles / Q000737:chemistry; D055095:Optics and Photonics / Q000295:instrumentation / Q000379:methods; D020349:Surface Plasmon Resonance / Q000379:methods; D013499:Surface Properties
chemical_list: D006046:Gold