Determination of strobilurin fungicides residual in vegetables based on amino modified magnetic graphene oxide solid phase extraction coupled with GC-MS/MS.

This research investigated the creation and utilization of an amino-functionalized magnetic graphene oxide (Fe₃O₄-NH₂@GO) nanocomposite as a selective sorbent for extracting and identifying strobilurin fungicides (SFs) from vegetable samples. The investigation utilized a method where magnetic solid phase extraction (MSPE) was integrated with Gas chromatography-triple quadrupole mass spectrometer (GC-MS/MS) for analysis. The physicochemical properties of synthesized sorbent were characterized using Scanning electron microscope (SEM) , Fourier infrared transform spectrum (FT-IR) , X Ray Diffraction (XRD), and vibrating sample magnetometry (VSM) techniques.

Efficient Sorption of Arsenic on Nanostructured Fe-Cu Binary Oxides: Influence of Structure and Crystallinity.

To study the structure-performance relationship, a series of nanostructured Fe-Cu binary oxides (FCBOs) were prepared by varying synthesis conditions. The obtained binary oxides were well characterized using X-ray diffraction (XRD), transmission electron microscope (TEM), Brunner-Emmet-Teller (BET), magnetic and Zeta potential measurement techniques. Both As(V) and As(III) sorption on the FCBOs were evaluated by batch tests.

An electrochemical aptasensor for the milk allergen β-lactoglobulin detection based on a target-induced nicking site reconstruction strategy.

Food allergy is an immune system reaction to a particular food, milk being the most common one. β-Lactoglobulin (β-Lg) is the main ingredient of milk protein and the main cause of infant milk allergy. On such an occasion, the determination of β-Lg is very important and the electrochemical sensors are a good alternative for this purpose since they are sensitive, selective and inexpensive.

Self-template formation of porous CoO hollow nanoprisms for non-enzymatic glucose sensing in human serum.

A novel type of porous CoO hollow nanoprism (HNP) was successfully prepared using tetragonal cobalt acetate hydroxide [Co(OH)(OAc)·2HO] as precursor by a facile solvothermal process and a subsequent calcination treatment. The morphology and structure of the CoO HNPs were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (XRD) and N adsorption-desorption measurements. An enzyme-free glucose sensor was constructed based on the CoO HNPs, and the electrochemical performance was tested by cyclic voltammetry (CV) and chronoamperometry.

Effectiveness Analysis of Systematic Combined Sewer Overflow Control Schemes in the Sponge City Pilot Area of Beijing.

Combined sewer overflow (CSO) pollution poses a serious threat to the urban water environment and is more severe in old urban areas. This research uses the old urban area in the sponge city pilot area in Tongzhou District, Beijing, as the study area. The United States Environmental Protection Agency (USEPA) storm water management model (SWMM) was used to establish the hydrologic and hydraulic model of this area.

Comparative susceptibility of thirteen selected pesticides to three different insect egg parasitoid Trichogramma species.

The parasitoid Trichogramma species are indispensable natural enemies of many lepidopterans and it plays an important role in integrated pest management (IPM) programs throughout the world. Laboratory studies were conducted to compare the susceptibility of three Trichogramma egg parasitoid species to ten common insecticides and three herbicides. The adults of Trichogramma dendrolimi, T.

Au nanoparticles-ZnO composite nanotubes using natural silk fibroin fiber as template for electrochemical non-enzymatic sensing of hydrogen peroxide.

A novel electrochemical sensor based on the composite of gold nanoparticles/zinc oxide nanotube (AuNPs/ZnO-NTs) was constructed and its application as hydrogen peroxide (HO) non-enzymatic sensor was investigated. ZnO-NTs were prepared by a biomineralization strategy in which silk fibroin fiber (SFF) was used as template, and thus the ZnO-NTs inherited the advantages of SFF such as mechanical stability, flexible biomimetic morphology and biocompatibility. The AuNPs/ZnO-NTs was further prepared by the electrostatic absorption of AuNPs onto the surface of ZnO-NTs, and found to be capable to catalyze the reduction of HO.

Double determination of long noncoding RNAs from lung cancer via multi-amplified electrochemical genosensor at sub-femtomole level.

An ultrasensitive electrochemical genosensor has been fabricated for the double determination of two different specific sequences deduced from the maternally expressed gene3 (MEG3) lncRNA (long noncoding RNA), which was demonstrated by coupling RNase A-aided target recycling with DNA supersandwich-induced signal enhancement, based on a composite interface of graphene-like tungsten disulfide/dendritic gold nanostructures (WS/DGN). Firstly, duple target sequences of T and T were captured by the primer probes of P/P functionalized FeO@C magnetic nanoparticles, via the DNA/RNA hybridization between T/T and P/P. In the presence of RNase A, T and T were released to trigger the target recycling, accompanied by the generation of numerous intermediate DNAs designated as IT and IT, respectively.

Aflatoxin B1 Electrochemical Aptasensor Based on Tetrahedral DNA Nanostructures Functionalized Three Dimensionally Ordered Macroporous MoS-AuNPs Film.

In food safety evaluation, aflatoxin B1 (AFB1) is an important indicator. In this work, we developed an AFB1 electrochemical aptasensor based on a tetrahedral DNA nanostructures (TDNs) immobilized three dimensionally ordered macroporous MoS-AuNPs hybrid (3DOM MoS-AuNPs) recognition interface and horseradish peroxidase (HRP) functionalized magnetic signal amplifier. To greatly enhance the recognition efficiency, sensitivity, and stability of the aptasensor, the AFB1 aptamer-incorporated TDNs were ingeniously combined with the 3DOM MoS-AuNPs film for the construction of the sensing interface.