Disposable electrochemical microfluidic device for ultrasensitive detection of egg allergen in wine samples.

Autor: Baldo TA; Departamento de Química, Universidade Federal de São Carlos, 13565-905, São Carlos, São Paulo, Brazil., Proença CDA; Departamento de Química, Universidade Federal de São Carlos, 13565-905, São Carlos, São Paulo, Brazil., Felix FDS; Departamento de Química, Universidade Federal de Lavras, CEP, 37200-900, Lavras, Minas Gerais, Brazil., Freitas TA; Departamento de Química, Universidade Federal de São Carlos, 13565-905, São Carlos, São Paulo, Brazil., Sakata SK; Centro de Tecnologia das Radiaçõs - Instituto de Pesquisa Energéticas e Nucleares (IPEN/CNEN-SP), CEP, 05508-000, São Paulo, São Paulo, Brazil., Angnes L; Instituto de Química, Universidade de São Paulo, CEP, 05508-000, São Paulo, São Paulo, Brazil., Faria RC; Departamento de Química, Universidade Federal de São Carlos, 13565-905, São Carlos, São Paulo, Brazil. Electronic address: rcfaria@ufscar.br.
Jazyk: angličtina
Zdroj: Talanta [Talanta] 2021 Sep 01; Vol. 232, pp. 122447. Date of Electronic Publication: 2021 May 01.
DOI: 10.1016/j.talanta.2021.122447
Abstrakt: Food allergies have been increasing all over the world. Egg is an important component in the food industries and the second most common cause of food allergy, shortly after milk. In the wine industry, egg white is applied as a fining agent for tannin removal. In this study, a sandwich-based immunoassay for ultrasensitive detection of ovalbumin (OVA) in wine samples was developed. The assay involves the use of magnetic beads (MBs) decorated with a polyclonal anti-OVA antibody (Ab 2 ) and horseradish peroxidase (HRP), used as label for the quantification in a disposable electrochemical microfluidic device (DEμD) here developed. The Ab 2 -MB-HRP prepared was applied to capture, separate, and pre-concentrate OVA from wine samples. In the DEμD, OVA was immune-magnetically captured (OVA-Ab 2 -MB-HRP), producing a sandwich structure (GO-Ab 1 -OVA-Ab 2 -MB-HRP) on the electrode's surface. This arrangement results in an ultrasensitive device, achieving the ultralow limit of detection of 0.2 fg mL -1 OVA. Five samples of wines were analyzed by using the immuno-magneto-assay which presents excellent accuracy compared with enzyme-linked immunosorbent assay (ELISA).
(Copyright © 2021 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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