10 results about "Carbofuran" patented technology

This invention relates to a method for preparing a nanozyme detection reagent for carbofuran residues in apples, belonging to the field of pesticide residue and food safety technology. Specific steps: (1) Prepare mesoporous polydopamine powder using polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, dopamine hydrochloride, etc.; (2) Prepare a copper-manganese bimetallic carbon dot solution using citric acid, copper chloride, manganese chloride, and ethylenediamine; (3) Prepare the nanozyme detection reagent using the mesoporous polydopamine solution and the copper-manganese bimetallic carbon dot solution. Mesoporous polydopamine has a large specific surface area, providing numerous sites for carbon dot loading and effectively adsorbing carbofuran molecules. The copper-manganese bimetallic carbon dots give the nanozyme detection reagent good enzyme-like activity and generate pesticide concentration-dependent colorimetric and photothermal signals. This invention achieves mutual verification of dual-mode output signals, significantly improving detection reliability; and completes detection within 1.5 h.

This invention relates to a method for preparing a bimodal hydrogel detection reagent for carbofuran residues in cucumbers, belonging to the field of food safety testing. The bimodal hydrogel detection reagent is a hydrogel-like detection reagent synthesized by adding a copper-doped metal-organic framework to a sodium alginate-calcium carbonate hydrogel system. The bimodal hydrogel detection reagent is a three-dimensional network structure material. The detection limit of the bimodal hydrogel detection reagent for carbofuran in cucumbers is 17.59 μM in the colorimetric mode (0-250 μM) and 5.98 μM in the fluorescence mode (0-180 μM), achieving bimodal detection. This not only enables real-time on-site monitoring of carbofuran residues in cucumbers but also ensures the accuracy of the detection results through cross-validation between the two modes; the detection time is within 1.5 hours, and it exhibits good specificity for carbofuran residues in cucumbers.

The application discloses a simple detection method for carbofuran in vegetables and fruits, which comprises the following steps: step one, quantum dot preparation; step two, polymer synthesis; step three, characterization test; step four, fluorescence test; step five, adsorption test; step six, pretreatment adjustment; and step seven, detection comparison. Compared with the existing detection method for carbofuran in vegetables and fruits, the application uses quantum dots as a fluorescent sensor recognition element, introduces hydroxylated graphene, uses a carbofuran standard as a template molecule, and uses a molecular imprinting technique to synthesize a fluorescent molecular imprinting polymer, so that the detection of carbofuran has certain specificity, the accuracy of detection is improved, and false negative or false positive results are avoided. The application has a short detection time, can achieve on-site detection and result output, greatly improves the detection efficiency, is simple to operate, has small required detection instrument volume and low cost, is convenient to carry, and is favorable for popularization of the detection method.

The invention discloses a cotton seed treatment suspending agent and a preparation method thereof, and relates to the technical field of pesticide preparations. The cotton seed treatment suspending agent comprises carbofuran raw medicine, carbendazim raw medicine, pyraclostrobin raw medicine, a dispersing agent, a thickening agent, an anti-freezing agent, a coloring agent and a film-forming agent. According to the invention, through the synergistic optimization of the ternary active compound and the special auxiliary agent, multiple prevention and control effects are realized, and a powerful technical support is provided for quality improvement and efficiency improvement of cotton.

This invention discloses the use of chitosan in reducing carbofuran residues in crops. It involves exogenously applying carboxylated chitosan to crops treated with carbofuran. For hydroponically grown crops, the method of exogenously applying carboxylated chitosan is as follows: dissolve the carboxylated chitosan into a stock solution, then add it directly to the nutrient solution or dilute it to a set concentration and spray it onto the crop leaves. For soil-grown crops, the method of exogenously applying carboxylated chitosan is as follows: dissolve the carboxylated chitosan into a stock solution, dilute it to a set concentration, and then apply it directly to the crop roots or spray it onto the crop leaves. This invention discovers the effect of exogenously applying carboxylated chitosan on promoting the metabolism of carbofuran in maize, and explores the possible mechanism by which carboxylated chitosan promotes the metabolism of carbofuran in maize through transcriptome sequencing analysis, providing a reference method for the regulation of pesticide residues in plants.

The invention belongs to the technical field of pesticides, and particularly relates to the technical field of pesticide compounding, in particular to a synergistic acaricidal composition. The synergistic acaricidal composition comprises an active compound (A), a compound shown in a formula Ia (formula Ia) and at least one active compound (B), and the active compound (B) is selected from the group consisting of chlorfenapyr, phoxim, dimethoate, pyridazinofos, carbosulfan, amitraz, lambda-cyhalothrin, lime sulfur, sulfur, chlorpyrifos, profenofos, lambda-cyhalothrin, triflumizone, Sulfiflumin, Spirobudifen, Mivorisaner, Modoplaner, Tigolaner, Umifoxolaner and Flupentifenox. The weight ratio of the active compound (A) to the active compound (B) is (1: 100)-(100: 1). The synergistic acaricidal composition can effectively improve the prevention and control effect on pest mites, has a remarkable synergistic effect compared with a single agent, and can effectively reduce the use amount, reduce the use cost and reduce the influence on the environment.

This invention discloses a colorimetric detection method for carbofuran based on a paper-based nanozyme functionalized with smartphone assistance. The method includes the following steps: First, carbon quantum dot / graphite-phase carbon nitride (C-dots / g-C3N4) nanozymes are prepared. Under visible light irradiation, the C-dots / g-C3N4 photoresponsive nanozyme catalyzes the oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) to generate blue oxidized TMB (oxTMB), which has a strong absorption peak at 652 nm. Carbofuran hydrolyzes under acidic conditions to generate sulfur-containing compounds, inhibiting the colorimetric reaction and causing a decrease in absorbance at 652 nm. Based on the change in absorbance at 652 nm with carbofuran concentration, the detection of carbofuran can be achieved. The catalytic activity of the C-dots / g-C3N4 photoresponsive nanozyme is significantly improved compared to g-C3N4, providing guidance for the preparation of highly catalytically active g-C3N4-based photoresponsive nanozymes. This method uses photoresponsive nanozymes, which can be precisely controlled by switching the light source on and off, making the detection results more accurate. It does not rely on large instruments, is easy to operate, and the phenomena are intuitive.

This invention discloses a bismuth ferrite / bismuth vanadate photo-Fenton catalyst, its preparation method, and a wastewater treatment device, belonging to the field of wastewater treatment technology. This invention prepares the bismuth ferrite / bismuth vanadate photo-Fenton catalyst via a sol-gel method, which can solve the problem of Fe in traditional Fenton technology. 3+ / Fe 2+ In addition to addressing the technical problem of cyclic obstruction, the photo-Fenton catalyst of this invention has the characteristic of wavelength-selective degradation, which can generate different active species under light conditions with wavelengths <450nm and wavelengths >600nm respectively, thereby achieving segmented and efficient removal of different types of pesticides such as imidacloprid, paraquat, carbofuran, and methomyl from wastewater.

The invention relates to stable and efficient carbendazim wettable powder and a preparation process thereof, and belongs to the technical field of pesticide preparations. The carbendazim wettable powder comprises the following components in percentage by mass: 45-50% of carbendazim, 0.5-2% of a composite modified wetting agent, 4-8% of a sulfonated polycarboxylate dispersant, 10-20% of chemically grafted modified kaolin and the balance of filler. The compound modified wetting agent is formed by compounding amino modified sodium dodecyl benzene sulfonate and carboxyl modified fatty alcohol-polyoxyethylene ether, and the chemically grafted modified kaolin is chemically grafted and modified by a silane coupling agent. Through a crushing and surface coating integrated process, the product wetting time is short, the suspension rate is high, the heat storage stability is excellent, and crop diseases caused by fungi can be effectively prevented and treated.

The present application belongs to the technical field of pesticide detection, and particularly relates to a multi-in-one pesticide residue quantitative detection test paper and a detection method. The test paper is provided with gold nanoparticle labeled antibodies of at least two kinds of pesticides on a colloidal gold combination pad; a chromatography membrane is provided with a quality control line and at least two detection lines, each detection line is coated with an antigen of one kind of pesticide; the pesticides are selected from chlorpyrifos, phorate, dimethoate, acetamiprid, carbendazim, procymidone, fenpropathrin, carbofuran, isoprocarb, chlorothalonil, chlorfenapyr, parathion, tetramethylenedisulfide, triadimefon, isocarbophos or parathion. Through optimization of the pesticide types and preparation methods of the antigens and antibodies, the present application overcomes the problem of mutual interference of detection targets when multiple pesticides are simultaneously detected, has good specificity, high sensitivity, can accurately quantify, can simultaneously detect multiple components, and has simple pretreatment, and thus has good application prospect.