Metal Organic Framework steered electrosynthesis of anisotropic gold nanorods for specific sensing of organophosphate pesticides in vegetables collected from the field

Abstract

The uncontrolled use of the organophosphate (OP) group of pesticides has led to its accumulation in food and vegetables causing major health issues. Hence, the need to develop a reliable...

Efficient Gas and VOC Separation and Pesticide Detection in a Highly Stable Interpenetrated Indium–Organic Framework

“…After the addition of DCN, the fluorescence lifetime of 1 was almost not affected, confirming that the quenching does not result from interactions between DCN and the skeleton (Figure S11). ,, Meanwhile, according to density functional theory (DFT) simulations, the H 4 BDPO ligand has a lower energy level of lower unoccupied molecular orbitals (LUMO) relative to DCN (Figure a and Table S4), which hinders the charge transfer of electrons from H 4 BDPO to DCN, implying that a photoinduced electron transfer (PET) process is not the reason for fluorescence quenching here. , According to the above discussion and previous literature reports, ,, the quenching mechanism may be largely attributed to resonance energy transfer (RET). The process is mainly through effective overlaps between the emission band of the MOF and the the absorption band of the analyte, so that the resonance energy shifts to the analyte, thus resulting in fluorescence quenching.…”

“…In addition to being widely used in separation materials, MOFs are also attracting attention in the field of fluorescent materials due to their fast response, high selectivity and sensitivity, and recyclability. − Pesticides, such as 2,6-dichloro-4-nitroaniline (DCN), are important chemicals in agricultural production. After being used in the field, only 1% of the total used is absorbed by the target species, and the residues accumulating in the water body pollute the water source and ultimately cause harm to the human body. − Therefore, stable luminescent MOFs, especially in water, are more desirable for the detection of pesticides. , …”

Visual evaluation of acetylcholinesterase inhibition by an easy-to-operate assay based on N-doped carbon nanozyme with high stability and oxidase-like activity

“…To date, a variety of sensing methods have been developed for the screening of AChE activities and inhibitors, such as fluorescence, [5][6][7][8] chemiluminescence, 9,10 chromatography assays, 11 and electrochemical methods. [12][13][14] Among them, colorimetric assays have attracted significant attention due to their advantages of low cost, use of simple instruments, ease of operation, and even naked-eye recognition. 15,16 Ellman's method has been widely used in the evaluation of AChE activity.…”

Acetylcholinesterase–Cu3(PO4)2 hybrid nanoflowers for electrochemical detection of dichlorvos using square-wave voltammetry

“…13 The development of nanomaterials offers great opportunities for the construction of an effective matrix for enzyme immobilization. Various nanostructured materials have been designed as support materials for AChE immobilization, ranging from nanoparticles with a zero-dimensional (0D) morphology, 14 nanorods with 1D structures, 15 and nanosheets with 2D structures, 16 to 3D hierarchically structured materials built with 2D nanomaterials as building blocks. 17 In particular, 3D hierarchical nanostructures are well suited for the immobilization of enzyme molecules because their large surface area facilitates the exposure of more active sites for enzyme loading, and the contact between the substrate and the enzyme.…”