Chitosan-magnetite nanocomposite as a sensing platform to bendiocarb determination

Abstract

A novel platform for carbamate-based pesticide quantification using a chitosan/magnetic iron oxide (Chit-FeO) nanocomposite as a glassy carbon electrode (GCE) modifier is shown for an analytical methodology for determination of bendiocarb (BND). The BND oxidation signal using GCE/Chit-FeO compared with bare GCE was catalyzed, showing a 37.5% of current increase with the peak potential towards less positive values, showing method's increased sensitivity and selectivity. Using square-wave voltammetry (SWV), calibration curves for BND determination were obtained (n = 3), and calculated detection and quantification limits values were 2.09 × 10 mol L (466.99 ppb) and 6.97 × 10 mol L (1555.91 ppb), respectively. The proposed electroanalytical methodology was successfully applied for BND quantification in natural raw waters without any sample pretreatment, proving that the GCE/Chit-FeO modified electrode showed great potential for BND determination in complex samples. ᅟ Graphical abstract.

A Review of Nanocomposite-Modified Electrochemical Sensors for Water Quality Monitoring

“…Lately, several sensors for determination of methyl parathion were also reported, but with typical LODs for electrochemical detection in the submicro to the nanomolar range: 3D flower-like praseodymium molybdate-decorated reduced graphene oxide (LOD 1.8 × 10 −3 μM), MnO 2 /PANI/rGO-A (LOD 7.4 × 10 −3 μM) [ 85 ] and a monolayer of zirconium (IV) phosphonate on glassy carbon electrode (LOD 0.0045 μM) [ 86 ]. Also, the chitosan/magnetic Fe 3 O 4 nanocomposite-modified glassy carbon electrode in combination with square wave voltammetry was used for bendiocarb determination, but the LOD was 2.09 μM with a LOQ of 6.97 μM [ 87 ]. Apparently, the selectivity was rather good, compensating for the relatively high LOD, and enabling bendiocarb detection in complex matrices.…”

“…Recently many carbon-based nanomaterials like carbon nanotubes (CNT) and graphene-based materials have been introduced. Some review papers on this topic are available in the literature [ 87 ]. While there are many cases where carbon materials are used as a support for different metallic or oxide nanostructures or scaffolds for biologically active compounds, several reports consider “only-carbon” electrodes for pesticide detection via their direct electrochemistry.…”

Advances in electrochemical detection methods for measuring contaminants of emerging concerns

“…[186] These provide a rapid enzyme-less electrochemical detection of pesticides. A variety of electrochemical detection methods have been developed using conductive polymers, 3D graphene-Au or reduced graphene decorated with Cu/CuO-Ag for carbaryl, [187][188][189] chitosan-magnetite for bendiocarb, [190] iron oxidechitosan-AChE composites, and printable carbon black SPE for carbofuran, [191][192][193][194][195] press-transferred carbon black on microfluidic chips for phenyl carbamate. [196] Other electrode configurations are based on boron-doped diamond that have been used to detect mancozeb, [197] formetanate, [198] methiocarb, [199] methomyl, [200] and ziram.…”

Non‐enzymatic electrochemical detection of dopamine in blood serum based on porous nitrogen‐doped graphene/Fe 3 O 4 nanocomposites

“…Metal oxide nanoparticles have suggested a great potential application in materials science and have been widely used to improve the sensor performance. Fe 3 O 4 , a member of n‐type semiconducting metal oxide materials, has been a popular candidate for biosensing [15, 16], but its high electron–hole recombination rate, poor electrocatalytic and cycling performance has hindered its application to some extent. Besides, the catalytic performance of Fe 3 O 4 nanoparticles has a great relation with their distinctive morphologies.…”