7 results about "Paraoxon" patented technology

The invention relates to a food pesticide residue detection method, and belongs to the technical field of pesticide residue detection.According to the technical scheme, prepared green light-emitting cadmium telluride quantum dot (at) MOF-808 fluorescent composite materials and MOF-5 / red light-emitting cadmium telluride quantum dot molecularly imprinted polymer fluorescent composite materials are used as fluorescent probes; the fluorescent probe can simultaneously detect paraoxon, acetamiprid and clothianidin, and has the advantages of accurate detection result, low detection limit and rapid and stable detection.

The invention discloses a cerium-based nano-enzyme, a preparation method thereof and application of the cerium-based nano-enzyme in organophosphorus pesticide detection, and belongs to the technical field of pesticide residue detection. The cerium-based nano-enzyme has activity similar to that of organophosphorus hydrolase, and comprises a nitrogen-doped carbon nanosheet substrate and Ce2O2CN2 nano-particles loaded on the surface of the nitrogen-doped carbon nanosheet substrate. The nano-enzyme provided by the invention avoids the use of natural enzymes (such as organophosphorus hydrolase, acetylcholin esterase, alkaline phosphatase and the like) which are expensive in price, difficult to store and harsh in reaction condition, and realizes low-cost rapid detection of paraoxon. Compared with the reported Ce-based nano-enzyme, the nano-enzyme prepared by the invention is simple in preparation method, good in stability, small in usage amount, mild in reaction condition (37 DEG C), high in detection speed and wide in measurement range, a test result can be directly displayed by an ultraviolet-visible spectrophotometer, on-site real-time detection can be realized, and the pesticide paraoxon can be quickly and accurately detected.

The invention discloses a kit for detecting paraoxon and phosphorus organophosphorus pesticides in real time, and belongs to the technical field of pesticide detection. The invention provides a high-selectivity kit for real-time detection of paraoxon organophosphorus pesticides, the kit comprises the following components: a methanol solution, a cerium dioxide nano dispersion liquid and a sodium hydroxide solution, and during use, the paraoxon organophosphorus pesticide residue is detected through color change. The high-selectivity kit for real-time detection of the oxyphosphate organophosphorus pesticide can be used for on-site handheld detection of the oxyphosphate organophosphorus pesticide, and has the advantages of low cost, simplicity in manufacturing, simplicity and convenience in operation, high selectivity and the like.

The present invention discloses the application of AuNCs@dmSiO2 composite materials in the detection of organophosphorus pesticide paraoxon, belonging to the field of fluorescence sensing technology. The present invention combines mesoporous silica spheres with AuNCs, and through the spatial confinement effect, prepares AuNCs@dmSiO2 fluorescent composite materials with better fluorescence properties. 2+ The quenching effect of the fluorescent composite probe is caused by the reaction product of acetylcholinesterase and substrate acetylthiocholine (ATCh) binding to Cu 2+ This leads to the recovery of probe fluorescence, and organophosphorus pesticides can inactivate acetylcholinesterase, resulting in quenching of the fluorescence system. Therefore, the AuNCs@dmSiO2 composite material is used for the fluorescence detection of the organophosphorus pesticide paraoxon.

The present invention provides a gold-mesoporous cerium oxide heterostructure nanozyme, a preparation method and application thereof, and a detection method for organophosphorus pesticides, relating to the technical field of nanozyme materials. The gold-mesoporous cerium oxide heterostructure nanozyme provided by the present invention includes mesoporous cerium oxide nanorods and gold nanoparticles loaded on the surface of the mesoporous cerium oxide nanorods, and the mesoporous cerium oxide nanorods and the gold nanoparticles form a heterostructure. In the nanozyme provided by the present invention, the mesoporous cerium oxide nanorods have surface defects and a higher content of Ce<supgt;4+< / supgt; species. By modifying gold nanoparticles on the mesoporous cerium oxide nanorods, the nanozyme has the synergistic catalytic ability of a heterogeneous catalyst, high phosphatase-like activity, and can detect organophosphorus pesticides such as parathion-methyl, parathion-ethyl, paraoxon-methyl, and paraoxon-ethyl under both ultraviolet-visible and RGB value dual modes, and has good application prospects in the detection of organophosphorus pesticides.

The present invention relates to a method for detecting residual pesticides in food, belonging to the technical field of pesticide residue detection. In the technical solution of the present invention, the prepared green-emitting cadmium telluride quantum dot@MOF-808 fluorescent composite material and MOF-5 / red-emitting cadmium telluride quantum dot molecularly imprinted polymer fluorescent composite material are used as fluorescent probes. This fluorescent probe can simultaneously detect parathion, acetamiprid, and clothianidin, and has the advantages of accurate detection results, low detection limit, and fast and stable detection.

This invention discloses a nanocomposite material and its preparation method, a nanoenzyme-bioenzyme cascade sensor and its application, relating to the field of pesticide detection technology. The technical solution of this invention introduces flexible two-dimensional graphitic carbon nitride nanosheets as a soft template and spatial confinement agent for in-situ growth, effectively suppressing the excessive growth of PCN-222(Fe) crystals during the solvothermal process, successfully controlling its size from the micrometer scale to the submicrometer scale, resulting in higher catalytic activity. The nanoenzyme-bioenzyme cascade sensor constructed based on this composite material achieves broad-spectrum, ultrasensitive detection of pesticides such as glyphosate, dimethoate, and paraoxon. This sensor has a low detection limit in the pM-nM range, a wide linear range, and exhibits excellent recovery and precision in complex real-world samples, strong anti-interference ability, and high practicality.