8 results about "Thiram" patented technology

The invention relates to the technical field of pesticides, and discloses a seed treatment agent and application thereof. The seed treatment agent comprises an active component and an auxiliary agent, wherein the active ingredients are prepared from flonicamid, thiram and azoxystrobin. The invention also relates to application of the seed treating agent in prevention and treatment of diseases and insect pests of food crops and oil crops. The invention provides the seed treatment agent containing the three active ingredients of flonicamid, thiram and azoxystrobin, the product stability is improved, the seed treatment agent can tolerate high and low temperature intervals, meanwhile, the product suspension rate is high, the coating falling rate is low, the seed treatment safety is good, and the seed treatment agent can be subsequently used in different countries and regions and is beneficial to large-scale popularization and application. The seed treatment agent provided by the invention is simple in preparation process and simple and convenient to operate.

The invention discloses a cyclodextrin metal organic framework composite flexible SERS (Surface Enhanced Raman Scattering) substrate for instantly detecting pesticide residues as well as preparation and application thereof, a cyclodextrin metal organic framework material (CD-MOF) is used as a carrier, gold nanoparticles are synthesized in the structure of the carrier, and a gold-loaded cyclodextrin metal organic framework material (Au at CD-MOF) is obtained; then, glycerol triglycidyl ether (GTE) is used as a cross-linking agent, and a cross-linked gold-loaded cyclodextrin metal organic framework material (CL-Au and CD-MOF) is synthesized; and finally, taking filter paper as a three-dimensional template, and combining with polydimethylsiloxane (PDMS) to prepare the Paper CL-Au CD-MOF / PDMS composite flexible substrate with relatively good SERS detection performance. The composite flexible substrate has good SERS detection performance, the detection limit of thiram on the surfaces of apples is 4.2 * 10 <-8 > M, and the detection limit of thiram on the surfaces of cucumbers is 1 ppm.

The invention provides a functionalized melamine sensing sponge, a preparation method thereof and a thiram colorimetric-fluorescence visual dual-mode detection method, and belongs to the technical field of food safety detection. According to the invention, thiram is specifically combined with PDA-coated CuO2 in the sensing sponge, so that the nano-enzyme catalytic activity of the sensing sponge is excited, colorless TMB is catalyzed to be oxidized into blue oxTMB, and a characteristic absorption peak exists at 650 nm; meanwhile, the generated oxTMB can quench red fluorescence of RhB at HOF at 580 nm through an inner filtering effect; the color and fluorescence intensity change have a linear relationship with the concentration of the thiram, and the method can be used for quantitative detection of the thiram. Along with the increase of the concentration of thiram, the color of the sensing sponge is changed from pink to blue-green due to the generation of oxTMB under sunlight, and the red fluorescence is gradually weakened due to the fluorescence quenching effect under ultraviolet light. Therefore, dual-mode visual detection of colorimetric and fluorescence signals can be realized.

The invention discloses a fluorescent microneedle sensor based on DNA-silver nanocluster hydrogel as well as a preparation method and application of the fluorescent microneedle sensor. According to the sensor, polyacrylamide hydrogel is used as a flexible matrix, and DNA-silver nanoclusters are uniformly embedded into the flexible matrix to serve as a fluorescent indicator. The preparation method comprises the following steps: mixing an acrylamide monomer, a cross-linking agent, a DNA-silver nano-cluster solution, an initiator and a catalyst, and carrying out polymerization and one-step molding in a microneedle mold under the initiation of ultraviolet light. The prepared sensor has the advantages of excellent flexibility, high stretch rate, surface adhesion and stable fluorescence property. When the fluorescent probe is used for detecting thiram, the low detection limit of 0.199 mu M and good linear response can be realized based on the specific fluorescence quenching effect of the fluorescent probe. The sensor can be used for on-site rapid screening of pesticide residues on the surfaces of foods such as fruits and seafood without complex instruments, and has a wide application prospect in the fields of food safety and environmental monitoring.

The invention belongs to the technical field of SERS (Surface Enhanced Raman Scattering) and food safety detection, and particularly relates to application of an Ag-GO-PAM (Polyacrylamide) flexible SERS substrate to rapid detection of pesticide residues on the surface of pericarp. According to the method, the flexible SERS substrate is used for wiping the surface of the bent peel and then is taken down, and Raman spectrum detection of the pesticide thiram is carried out. The substrate is used for detecting thiram, and has the advantages that by adding GO, PAM hydrogel can form a pore structure which is uniform in pore size and adapts to pesticide molecule adsorption and mass transfer, meanwhile, the coffee ring effect caused by excessive aggregation or uneven dispersion of silver nanoparticles is inhibited, the silver nanoparticles are promoted to form a uniform SERS hot spot area, and the detection sensitivity is improved. And collaborative optimization of SERS detection sensitivity and stability is realized. An oxygen-containing functional group on the surface of the GO and the thiram bimolecule form specific interaction, so that a Raman signal of the thiram bimolecule can be remarkably amplified; the substrate is easy and convenient to prepare, complex pretreatment is not needed, and a reliable technology is provided for efficient detection of pesticide residues.

The invention relates to the technical field of SERS (Surface Enhanced Raman Scattering) sensors, in particular to a preparation method and application of an MXene (at) ZIF-67 (at) AuNPs sensor, and the preparation method comprises the following steps: firstly, synthesizing an MXene (at) ZIF-67 heterojunction with a photoelectric double-gain characteristic through an in-situ solvothermal method; then gold nanoparticles (AuNPs) are loaded on the surface of the MXene (at) ZIF-67 heterojunction by means of an amide bonding effect, and the MXene (at) ZIF-67 (at) AuNPs composite SERS substrate is constructed; finally, an SERS analysis platform for pesticide thiram residue detection is constructed. The composite substrate fully utilizes a conductive network of MXene and a plasma resonance effect of AuNPs to synergistically enhance an electromagnetic field, and meanwhile, by virtue of an enrichment effect of a ZIF-67 porous structure on target molecules and a formed hot spot effect, the Raman signal intensity and the detection sensitivity of thiram are remarkably improved. Experimental results show that a detection method based on the substrate is simple and convenient to operate, can realize efficient detection of thiram, has a low detection limit of 1.0 * 10 <-11 > M, and is suitable for high-precision detection of trace thiram pesticide in a complex matrix.

The present application belongs to the technical field of pest control, and particularly relates to a kind of fungi of the order of Mucorales in the class of Sordariomycetes and its application. The fungi is preserved in China General Microbiological Culture Collection Center, and the preservation number is CGMCC No. 42531. The fungi can be used for screening hazelnut disease-resistant lines or controlling hazelnut black spot disease. The present application proves by tests that eight kinds of pesticides, including penthiopyrad, mancozeb, difenconazole, pyraclostrobin, thiram, tridemorph, kresoxim-methyl and thiophanate-methyl, all have inhibitory effects on the fungi, which provides a new direction for controlling hazelnut black spot disease.

The present application provides a kind of fungicidal composition containing prothioconazole and thiram, comprising active ingredient and synergist, wherein active ingredient is composed of prothioconazole and thiram, and the mass ratio of prothioconazole and thiram is 1:5-5:1;Synergist is one or more of salicylic acid, oxalic acid or citric acid.The fungicidal composition of the present application has significant synergistic effect, and the addition of synergist (salicylic acid, oxalic acid, citric acid) in the composition can significantly improve the control effect of the fungicide on wheat scab and wheat powdery mildew, effectively reduce the dosage of active ingredient, slow down the development of drug resistance of pathogen, reduce environmental pollution and ensure food safety.