期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 24, 期 28, 页码 7172-7176出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201706095
关键词
adsorption; analytical methods; electrochemistry; micromotors; mycotoxins
资金
- NANOAVANSENS program from the Community of Madrid [S2013/MIT-3029]
- Spanish Ministry of Economy and Competitiveness [CTQ 2014-58643-R, CTQ2011-28153]
- Spanish Ministry of Education, Culture and Sports
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 ng mL(-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 ochratoxinA (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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