Electrochemical detection of peanuts at trace levels in foods using a magnetoimmunosensor for the allergenic protein Ara h 2
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2016
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Pellicanò, Alessandro
Cosio, Maria Stella
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Elsevier Science
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Montiel, V. R. V., Pellicano, A., Campuzano, S., Torrente-Rodríguez, R. M., Reviejo, Á. J., Cosio, M. S., & Pingarrón, J. M. (2016). Electrochemical detection of peanuts at trace levels in foods using a magnetoimmunosensor for the allergenic protein Ara h 2. Sensors and Actuators B: Chemical, 236, 825-833.
Abstract
A highly sensitive disposable amperometric magnetoimmunosensor for the rapid determination of Ara h 2 protein, one of the major peanut allergens, is reported. The approach uses a sandwich configuration involving selective capture and detector antibodies and carboxylic acid-modified magnetic beads (HOOC-MBs). Detector antibodies are labeled with HRP-conjugated secondary antibodies and the MBs bearing the immunoconjugates are magnetically captured on surface of a disposable screen-printed carbon electrode (SPCE). The affinity reactions are monitored amperometrically at −0.20 V (vs a Ag pseudo-reference electrode) in the presence of hydroquinone (HQ) as electron transfer mediator and upon addition of hydrogen peroxide as the enzyme substrate. The developed magnetoimmunosensor exhibits a wide range of linearity between 87 and 10,000 pg/mL Ara h 2 with a detection limit of 26 pg/mL as well as a great selectivity against other non-target proteins. The magnetoimmunosensing platform was successfully applied for the detection of Ara h 2 in different food extracts. After an appropriate sample dilution no matrix effects were observable. The developed methodology was able to detect trace amounts of the peanut allergen (0.0005% or 5.0 mg/kg) in wheat flour spiked samples. The results correlated properly with those provided by a commercial ELISA kit.