Selective and sensitive molecularly imprinted sol–gel film-based electrochemical sensor combining mercaptoacetic acid-modified PbS nanoparticles with Fe3O4@Au–multi-walled carbon nanotubes–chitosan

Abstract

A sensitive molecularly imprinted electrochemical sensor was developed for selective detection of streptomycin by combination of mercaptoacetic acid-modified PbS nanoparticles with Au-coated Fe 3 O 4 magnetic nanoparticles dispersed multi-walled carbon nanotubes doped chitosan film. The imprinted sensor was fabricated onto the Au electrode via stepwise modification of nanocomposites and an electrodeposited thin film of molecularly imprinted polymers via sol-gel technology. The morphologies and electrochemical behaviors of the imprinted sensor were characterized by scanning electron microscope, cyclic voltammetry, and differential pulse voltammetry, respectively. The prepared sensor showed very high recognition ability and selectivity for streptomycin. Under optimal conditions, the imprinted sensor displayed good electrocatalytic activity to the redox of streptomycin. And the differential voltammetric anodic peak current was linear to the logarithm of streptomycin concentration in the range from 1.0×10 −6 to 1.0×10 −3 mol L −1 , and the detection limit obtained was 1.5×10 −9 mol L −1 . This proposed imprinted sensor was used successfully for streptomycin determination in different injection solution samples.

Synthesis and Characterization of Fe3O4@SiO2 NPs as an Effective Catalyst for the Synthesis of Tetrahydrobenzo[a]xanthen-11-ones

“…Fe 3 O 4 MNPs were prepared according to a previously reported procedure by Hu et al 53 using the chemical co-precipitation method. Typically, FeCl 3 × 6H 2 O (2.7 g) and FeCl 2 × 4H 2 O (1 g) were dissolved in 100 mL of 1.2 mmol/L aqueous HCl followed by ultrasonic bath for 30 min.…”

Fabrication and characterization of double‐shelled CeO2‐La2O3/Au/Fe3O4 hollow architecture as a recyclable and highly thermal stability nanocatalyst

“…To further study the load of Au on HE MCs, as shown in Figure c, the interplanar distance of Au NPs between adjacent lattice planes is 0.32 nm, which is corresponded to (111) plane of Au NPs from SAED pattern in Figure d. The SAED pattern (Figure d) describe a dim ring corresponding to the (111) plane of face centered cubic golden, suggesting the successful formation of Au NPs on the surface of the support . Using H‐ACF MCs as seeds, a layer of mesostructured CL composite was further coated through the sol‐gel reaction involving the co‐assembly of Ce(NO 3 ) 3 ·6H 2 O and La(NO 3 ) 3 ·nH 2 O to form the H‐CLACF MCs.…”

Molecularly imprinted polymers on the surface of silica microspheres via sol‐gel method for the selective extraction of streptomycin in aqueous samples

“…The selection of the suitable polymerization condition, such as functional monomers, dispersing solvent, and temperature, is crucial for successful molecular imprinting . According to former study, APTEOS can interact with the target molecule STP through hydrogen bonds . With its amount growing, more hydrogen bonds would form thus strengthening the interaction between them.…”

“…The integration of MIPs with SPE has been continually reported in many research projects, which suggests it is a powerful candidate for the extraction of target analytes from complex matrices . As far as we know, only two surface plasmon resonance sensors have been reported involving the molecular imprinting techniques of STP to improve their response to STP in previous studies . But, the use of MIPs as a selective packing material for STP pretreatment has not been evaluated yet.…”