Artículo
Optimized surface plasmon resonance immunoassay for staphylococcal enterotoxin G detection using silica nanoparticles
Sarratea, Maria Belén
; Noli Truant, Sofia
; Mitarotonda, Romina Cristina
; Antonoglou, María Belén
; Chiappini, Santiago Andrés
; Fernández Lynch, María Julieta
; Romasanta, Pablo Nicolas
; Vescina, Maria Cristina; Desimone, Martín Federico
; de Marzi, Mauricio Cesar
; Malchiodi, Emilio Luis
; Fernández, Marisa Mariel
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Fecha de publicación:
06/2021
Editorial:
Academic Press Inc Elsevier Science
Revista:
Biochemical and Biophysical Research Communications
ISSN:
0006-291X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Staphylococcal enterotoxins are one of the most important causative agents of food poisoning. These molecules function as both gastrointestinal toxins and superantigens (SAgs) which can simultaneously bind MHC-II and T cell receptor leading to a non-specific polyclonal T cell activation and massive proinflammatory cytokine release. Common symptoms include vomiting and diarrhea; however, in more severe cases, systemic dissemination may result in toxic shock syndrome and can be lethal in a few hours. Only small amounts of these heat-stable toxins are needed to cause the disease. Therefore, it is highly important to detect quickly low concentrations of SAgs in biological samples. In this work, we report a surface plasmon resonance (SPR)-based capture immunoassay for the detection of the SAg SEG. We analyzed the use of different amplification strategies. The SPR-based double-antibody sandwich approach could detect picomolar levels of SEG. The use of antibody-coated silica nanoparticles (AbSiNPs) as an alternative enhancing reagent also detected SEG in the picomolar range. Although AbSiNPs did not improve the limit of detection, for the same amount of SAg tested, AbSiNPs gave a higher response level than free antibodies. This work highlights the suitability of silica nanoparticles for signal amplification in SPR-based biosensors. Overall, SPR biosensors offer the capability for continuous real-time monitoring and high sensitivity that can be befitting for the detection of enterotoxins in food industries, laboratories and regulatory agencies.
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Articulos(INEDES)
Articulos de INSTITUTO DE ECOLOGIA Y DESARROLLO SUSTENTABLE
Articulos de INSTITUTO DE ECOLOGIA Y DESARROLLO SUSTENTABLE
Citación
Sarratea, Maria Belén; Noli Truant, Sofia; Mitarotonda, Romina Cristina; Antonoglou, María Belén; Chiappini, Santiago Andrés; et al.; Optimized surface plasmon resonance immunoassay for staphylococcal enterotoxin G detection using silica nanoparticles; Academic Press Inc Elsevier Science; Biochemical and Biophysical Research Communications; 558; 6-2021; 168-174
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