Open AccessTwo New Fluorogenic Aptasensors Based on Capped Mesoporous Silica Nanoparticles to Detect Ochratoxin A
Author(s) -
Ribes Àngela,
SantiagoFelipe Sara,
Bernardos Andrea,
Marcos M. Dolores,
Pardo Teresa,
Sancenón Félix,
MartínezMáñez Ramón,
Aznar Elena
Publication year - 2017
Publication title -
chemistryopen
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 29
ISSN - 2191-1363
DOI - 10.1002/open.201700106
Subject(s) - aptamer , mesoporous silica , nanotechnology , detection limit , ochratoxin a , rhodamine b , nanoparticle , nanomaterials , selectivity , mesoporous material , chemistry , materials science , chromatography , organic chemistry , mycotoxin , genetics , food science , photocatalysis , biology , catalysis
Aptamers have been used as recognition elements for several molecules due to their great affinity and selectivity. Additionally, mesoporous nanomaterials have demonstrated great potential in sensing applications. Based on these concepts, we report herein the use of two aptamer‐capped mesoporous silica materials for the selective detection of ochratoxin A (OTA). A specific aptamer for OTA was used to block the pores of rhodamine B‐loaded mesoporous silica nanoparticles. Two solids were prepared in which the aptamer capped the porous scaffolds by using a covalent or electrostatic approach. Whereas the prepared materials remained capped in water, dye delivery was selectively observed in the presence of OTA. The protocol showed excellent analytical performance in terms of sensitivity (limit of detection: 0.5–0.05 n m ), reproducibility, and selectivity. Moreover, the aptasensors were tested for OTA detection in commercial foodstuff matrices, which demonstrated their potential applicability in real samples.