Addressing the analytical challenges for the detection of ciguatoxins using an electrochemical biosensor
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Author
Leonardo, Sandra
Tsumuraya, Takeshi
Hirama, Masahiro
Turquet, Jean
Sagristà, Núria
Rambla-Alegre, Maria
Flores, Cintia
Caixach, Josep
O'Sullivan, Ciara K.
Publication date
2020-03-05ISSN
0003-2700
Abstract
The importance of ciguatoxins (CTXs) in seafood safety and their emerging occurrence in locations far away from tropical areas highlight the need for simple and low-cost methods for the sensitive and rapid detection of these potent marine toxins to protect seafood consumers. Herein, an electrochemical immunosensor for the detection of CTXs is presented. A sandwich configuration is proposed, using magnetic beads (MBs) as immobilisation supports for two capture antibodies, with their combination facilitating the detection of CTX1B, CTX3C, 54-deoxyCTX1B and 51-hydroxyCTX3C. PolyHRP-streptavidin is used for the detection of the biotinylated detector antibody. Experimental conditions are first optimised using colorimetry, and these conditions are subsequently used for electrochemical detection on electrode arrays. Limits of detection at the pg/mL level are achieved for CTX1B and 51-hydroxyCTX3C. The applicability of the immunosensor to the analysis of fish samples is demonstrated, attaining detection of CTX1B at contents as low as 0.01 µg/kg, and providing results in correlation with those obtained using mouse bioassay (MBA) and cell-based assay (CBA), as well as liquid chromatography coupled to high-resolution mass spectrometry (LC-ESI-HRMS). This user-friendly bioanalytical tool for the rapid detection of CTXs can be used to mitigate ciguatera risk and contribute to the protection of consumer health.
Document Type
Article
Document version
Accepted version
Language
English
Subject (CDU)
63 - Agriculture and related sciences and techniques
Pages
14
Publisher
American Chemical Society
Is part of
Analytical Chemistry
Citation
Leonardo, Sandra, Greta Gaiani, Takeshi Tsumuraya, Masahiro Hirama, Jean Turquet, Núria Sagristà, Maria Rambla-Alegre, Cintia Flores, Josep Caixach, Jorge Diogene, Ciara K. O’Sullivan, Carles Alcaraz, and Mònica Campàs. 2020. "Addressing The Analytical Challenges For The Detection Of Ciguatoxins Using An Electrochemical Biosensor". Analytical Chemistry 92 (7), 4858-4865. American Chemical Society. doi:10.1021/acs.analchem.9b04499.
Grant agreement number
MINECO-FEDER/Programa Estatal de I+D+I orientada a los retos de la sociedad/BIO2017-87946-C2-2-R/ES/DISPOSITIVOS BIOANALITICOS PARA LA DETECCION RAPIDA Y RENTABLE DE GAMBIERDISCUS Y CIGUATOXINAS/CIGUASENSING
Program
Aigües Marines i Continentals
This item appears in the following Collection(s)
- ARTICLES CIENTÍFICS [2510]
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Copyright © American Chemical Society
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