Magnetic reduced graphene oxide/nickel/platinum nanoparticles micromotors for mycotoxin analysis
Authors
Escarpa Miguel, Jesús Alberto; López Gil, Miguel Ángel; Molinero Fernández, Águeda; Moreno Guzmán, MaríaIdentifiers
Permanent link (URI): http://hdl.handle.net/10017/60471DOI: 10.1002/ chem.201706095
ISSN: 0947-6539
Date
2018-04-16Affiliation
Universidad de Alcalá. Departamento de Química Analítica, Química Física e Ingeniería QuímicaFunders
Ministerio de Economía y Competitividad
Comunidad de Madrid
Bibliographic citation
Chemistry - A European Journal, 2018, v. 24, n. 28, p. 7172-7176
Keywords
adsorption
analytical methods
electrochemistry
micromotors
mycotoxins
Project
info:eu-repo/grantAgreement/CAM//S2013%2FMIT- 3029/ES/NANOAVANSENS
info:eu-repo/grantAgreement/MINECO//CTQ 2014-58643-R
Document type
info:eu-repo/semantics/article
Version
info:eu-repo/semantics/aceptedVersion
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
© Wiley-VCH
Access rights
info:eu-repo/semantics/openAccess
Abstract
Magnetic reduced graphene oxide/nickel/platinum nanoparticles (rGO/Ni/PtNPs) micromotors for mycotoxin analysis in food samples were developed for food-safety diagnosis. While the utilization of self-propelled micromotors in bioassays has led to a fundamentally new approach, mainly due to the greatly enhanced target?receptor contacts owing to their continuous movement around the sample and the associated mixing effect, herein the magnetic properties of rGO/Ni/PtNPs micromotors for mycotoxin analysis are additionally explored. The micromotor-based strategy for targeted mycotoxin biosensing focused on the accurate control of micromotor-based operations: 1) on-the-move capture of free aptamers by exploiting the adsorption (outer rGO layer) and catalytic (inner PtNPs layer) properties and 2) micromotor stopped flow in just 2 min by exploiting the magnetic properties (intermediate Ni layer). This strategy allowed fumonisin B1 determination with high sensitivity (limit of detection: 0.70 ngmL@1) and excellent accuracy (error: 0.05% in certified reference material and quantitative recoveries of 104:4% in beer) even in the presence of concurrent ochratoxin A (105?108:8% in wines). These results confirm the developed approach as an innovative and reliable analytical tool for food-safety monitoring, and confirm the role of micromotors as a new paradigm in analytical chemistry.
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