The Electrochemical Detection of Ochratoxin A in Apple Juice via MnCO3 Nanostructures Incorporated into Carbon Fibers Containing a Molecularly Imprinting Polymer

Abstract

A novel electrochemical sensor based on MnCO3 nanostructures incorporated into carbon fibers (MnCO3NS/CF), including a molecularly imprinting polymer (MIP), was developed for the determination of Ochratoxin A (OTA). In this study, a sensitive and selective sensor design for OTA detection was successfully performed by utilizing the selectivity and catalysis properties of MIP and the synthesized MnCO3NS/CF material at the same time. MnCO3 nanostructures incorporated into carbon fibers were first characterized by using various analytical techniques. The sensor revealed a linearity towards OTA in the range of 1.0 × 10−11–1.0 × 10−9 mol L−1 with a detection limit (LOD) of 2.0 × 10−12 mol L−1. The improved electrochemical signal strategy was achieved by high electrical conductivity on the electrode surface, providing fast electron transportation. In particular, the analysis process could be finished in less than 5.0 min without complex and expensive equipment. Lastly, the molecular imprinted electrochemical sensor also revealed superior stability, repeatability and reproducibility.

Smartphone-Integrated Molecularly Imprinted Ratiometric Fluorescent Sensor for Selective and Visual Detection of Doxycycline in Lake Water and Foodstuff

“…In the field of nanomaterials, an increasing number of carbon nanomaterials, such as carbon nanotubes, graphitized carbon nitride, graphene oxide, and carbon fibers, have been used to construct nanosensors. Carbon quantum dots (CQDs) have aroused wide concern owing to their low toxicity, excellent optical properties, and easy fabrication .…”

Electrochemical detection and catalytic reduction of nitrobenzene using a bimetallic NiS2/Fe3S4 magnetic heterostructure: an innovative approach for environmental remediation

“…The resulting synergy enhances sensitivity, selectivity, versatility, and overall performance, making these structures pivotal for the advancement of electrochemical sensing technology. A variety of hybrid heterostructures have been utilized for electrochemical detection of various pollutants, including the GQDs/B- g -C 3 N 4 22 nanocomposite used for bisphenol detection, MnCO 3 NS/CF 23 for determination of ochratoxin A, the g-C 3 N 4 NS/BSA@MnO 2 24 nanocomposite for zearalenone, the WS 2 NFs/N,B-GR 25 heterostructure for analysis and detection of l -phenylalanine in milk samples, the GQDs–NiAl 2 O 4 26 nanocomposite for the selective determination of 5-hydroxymethyl furfural in coffee samples, the NiFe 2 O 4 @Gr 27 nanocomposite for determination of butylated hydroxy anisole, CdMoO 4 /g-C 3 N 4 28 as an electrochemical sensor for Carbendazim detection, the Co 3 O 4 -rGO/CNT 29 composite towards highly sensitive nitrite detection, AuNPs/CNTs-ErGO 30 electrochemical sensors for highly sensitive detection of hydrazine, cobalt-doped ZnO microstructures 31 for methane gas sensing, and CeO 2 -loaded In 2 O 3 32 and Au-loaded SnO 2 composite nanoparticles 33 for highly sensitive hydrogen detection. All these studies suggest that hybrid heterostructures offer versatility by extending the range of detectable analytes.…”