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Título: | The benefits of carbon black, gold and magnetic nanomaterials for point-of-harvest electrochemical quantification of domoic acid |
Autor: | Nelis, Joost L.D.; Migliorelli, Davide; Jafari, Safiye; Generelli, Silvia; Lou-Franco, Javier; Salvador, Juan Pablo CSIC ORCID; Marco, María Pilar CSIC ORCID CVN ; Cao, Cuong; Elliott, Christopher T.; Campbell, Katrina | Palabras clave: | Amperometry Biosensors Toxin Marine toxin Food analyses Material characterization Point of care Point of site Shellfish |
Fecha de publicación: | 12-feb-2020 | Editor: | Springer Nature | Citación: | Microchimica Acta 187: 164 (2020) | Resumen: | Gold nanostars (GNST), gold nanospheres (GNP) and carbon black (CB) are chosen as alternative nanomaterials to modify carbon screen-printed electrodes (c-SPEs). The resulting three kinds of modified c-SPEs (GNP-SPE, CB-SPE and GNSP-SPE) were electrochemically and microscopically characterized and compared with standardized c-SPEs after pretreatment with phosphate buffer by pre-anodization (pre-SPE). The results show outstanding electrochemical performance of the carbon black-modified SPEs which show low transient current, low capacitance and good porosity. A competitive chronoamperometric immunoassay for the shellfish toxin domoic acid (DA) is described. The performances of the CB-SPE, GNP-SPE and pre-SPE were compared. Hapten-functionalized magnetic beads were used to avoid individual c-SPE functionalization with antibody while enhancing the signal by creating optimum surface proximity for electron transfer reactions. This comparison shows that the CB-SPE biosensor operated best at a potential near − 50 mV (vs. Ag/AgCl) and enables DA to be determined with a detection limit that is tenfold lower compared to pre-SPE (4 vs. 0.4 ng mL−1). These results show very good agreement with HPLC data when analysing contaminated scallops, and the LOD is 0.7 mg DA kg−1 of shellfish. | Versión del editor: | https://doi.org/10.1007/s00604-020-4150-x | URI: | http://hdl.handle.net/10261/213945 | DOI: | 10.1007/s00604-020-4150-x |
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The benefits of carbon black, gold and magnetic nanomaterials.pdf | Artículo principal | 2,46 MB | Adobe PDF | Visualizar/Abrir |
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