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Detection of Arah1 (a major peanut allergen) in food using an electrochemical gold nanoparticle-coated screen-printed immunosensor

By Rita C. Alves, Filipa B. Pimentel, Henri P.A. Nouws, Raquel C.B. Marques, María Begoña González-García, M. Beatriz P.P. Oliveira and Cristina Delerue-Matos

Abstract

A gold nanoparticle-coated screen-printed carbon electrode was used as the transducer in the development of an electrochemical immunosensor for Ara h 1 (a major peanut allergen) detection in food samples. Gold nanoparticles (average diameter=32 nm) were electrochemically generated on the surface of screen-printed carbon electrodes. Two monoclonal antibodies were used in a sandwich-type immunoassay and the antibody–antigen interaction was electrochemically detected through stripping analysis of enzymatically (using alkaline phosphatase) deposited silver. The total time of the optimized immunoassay was 3 h 50 min. The developed immunosensor allowed the quantification of Ara h 1 between 12.6 and 2000 ng/ml, with a limit of detection of 3.8 ng/ml, and provided precise (RSD <8.7%) and accurate (recovery >96.6%) results. The immunosensor was successfully applied to the analysis of complex food matrices (cookies and chocolate), being able to detect Ara h 1 in samples containing 0.1% of peanut

Topics: Electrochemical immunosensor, Biosensor, Screen-printed carbon electrode, Allergen, Peanut, Ara h 1
Publisher: Elsevier
Year: 2015
DOI identifier: 10.1016/j.bios.2014.08.026
OAI identifier: oai:recipp.ipp.pt:10400.22/7255
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