Highly Sensitive Detection of Carbendazim and Its Electrochemical Oxidation Mechanism at a Nanohybrid Sensor

Abstract

Sensitive and rapid detection of pesticides in food has become an important and crucial research area due to the extensive use of agriculture residues and stringent environmental protection acts. In present work, an electrochemical nanohybrid sensor was facilely developed based on carboxymethyl cellulose (CMC) fuctionalized carbon nanotubes (CNTs). The sensor shows high sensitivity, excellent stability and good anti-interference capability in the detection of carbendazim (MBC) by differential pulse voltammetry method. Under optimized conditions, it exhibits a wide linearity of 0.03 μmol•L −1 -10 μmol•L −1 with a low detection limit of 0.015 μmol•L −1 . In real samples analyses for peer and kiwifruit, the proposed sensor shows good recoveries which are comparable with that of the conventional HPLC method. In addition, the oxidation mechanism of MBC at the nanohybrid sensor was studied using voltammetric methods and validated according to the density functional theory (DFT) calculation. The results reveal that the oxidation of carbendazim is a typical adsorption-controlled electrochemical oxidation process proceeding with four protons and four electrons. The proposed nanohybrid sensor is a promising alternative to the currently used methods for carbendazim detection and our results provide a new insight in MBC electrochemical oxidation mechanism.

Interfacial Superassembly of Mo2C@NiMn-LDH Frameworks for Electrochemical Monitoring of Carbendazim Fungicide

“…The limit of detection (LOD) and sensitivity are calculated using a standard formula, − and the LOD value is found to be 0.2 nM, 95.71 μA μM –1 cm –2 which is lower LOD and higher sensitivity when compared to previously reported literature for CBZ sensing based on different electrochemical platforms (Table ). − The enhanced activity of Mo 2 C@NiMn-LDH can be ascribed to the following reasons: (i) synergy effect between NiMn-LDH and Mo 2 C, (ii) increased electronic conductivity, and (iii) electron transfer due to morphological encapsulation, and hence, these results appropriately identify that Mo 2 C@NiMn-LDH/SPCE has an efficient capability for the determination of CBZ.…”

Cryogenic Sample Processing with Liquid Nitrogen for Effective and Efficient Monitoring of Pesticide Residues in Foods and Feeds

“…A literature search using Web of Science was conducted in April of 2019 to peruse the 200 most recent publications about pesticide residue analysis at the time. As before, a notable number of papers involved (bio)­sensors, , nanotechnology, − surface-enhanced Raman spectrometry (SERS), − and other microextraction techniques. A disproportionate number of publications entailed analysis of liquid samples (e.g., water, juices, and wine) rather than food or soil samples, undoubtedly in part as a result of the greater ease of sample processing and preparation of liquids versus solids.…”

Preparation of Functionalized Ayous Sawdust‐carbon Nanotubes Composite for the Electrochemical Determination of Carbendazim Pesticide

“…This value was far below the maximum allowable concentration limit of 100 ppb (0.52 μM) in water permitted by the World Health Organization [83]. Moreover, this detection limit of 0.04 μM was in the range of those reported for several Cbz electrochemical sensors [33,[44][45][46][47][48][49][50][51][52][53][54][55][56][57][84][85][86][87][88][89], and lower than values obtained on most electrodes prepared from rather simple modifiers; the sensor was slightly less efficient compared to those based on some nanomaterials such as graphene or MXenes (see Table S1). In order to evaluate the effectiveness of GCE/CNTs-MAS 4.8 for Cbz determination in environmental samples, a calibration curve was built using spring water collected near Mendong-Yaoundé city to prepare the electrolytic solution (Figure 9B, inset).…”

“…By contrast, electrochemical methods offer certain advantages such as low cost of instrumentation, fast analysis and high sensitivity [42,43]. Recently, electrochemical methods based on various electrode modifiers have been reported for the electrochemical determination of carbendazim in various matrices [44][45][46][47][48][49][50][51][52][53][54][55][56][57]. To the best of our knowledge, sawdust-CNTs composite material is not yet reported as electrode modifier for Cbz determination.…”