100 results about "Imidacloprid" patented technology

The invention discloses design and application of a colorimetric-catalytic signal enhancement combined graphene oxide nano-enzyme rapid pesticide residue detection platform, and belongs to the technical field of immunochromatography detection. Graphene (GO) is used as a substrate, 30 nm Pt nanoparticles are adsorbed on the surface of the substrate to provide a colorimetric signal, and gaps of Pt NPs are filled with 5 nm AuIr nanoparticles to enhance the catalytic performance of the substrate, so that the colorimetric / catalytic dual-signal enhanced nano-enzyme is prepared. The GO (at) Pt30-AuIr nano-enzyme is synergistically assembled with Pt NPs and AuIr NPs by utilizing the large specific surface area, excellent stability and dispersibility of GO, so that the catalytic performance of the system is remarkably improved. The method has the beneficial effects that a GO-Pt30-AuIr-LFA-based detection system can realize high-sensitivity dual detection on heavy metal cadmium ions (Cd < 2 + >) and pesticide residue imidacloprid (IMI) within 20 minutes, and the detection limit reaches the level of pg / mL. The detection method provided by the research shows significant application potential in the aspect of rapid screening of small molecules in a complex matrix, and a new technical approach is provided for food safety monitoring.

The invention belongs to the technical field of veterinary drug preparations, and particularly relates to a compound external ointment for treating parasites of dogs and cats and skin tinea and a preparation method, the compound external ointment comprises the following components by mass percent: 2%-12% of selamectin, 3%-20% of imidacloprid, 0.5%-2% of terbinafine hydrochloride, 2%-12% of dipropylene glycol monomethyl ether, 10%-50% of isopropanol, 9%-45% of polyethylene glycol 400 and the balance of water. The adhesive is prepared from, by weight, 9%-45% of polyethylene glycol 3350, 5%-15% of caprylic / capric polyethylene glycol glyceride, 1%-8% of oleyl alcohol, 0.5%-5% of dimeticone, 0.01%-0.1% of butylated hydroxytoluene and 1%-5% of cassava starch polymethylsesquioxane. The preparation method comprises the following steps: uniformly stirring the selamectin, the imidacloprid, the terbinafine hydrochloride and the mixed solvent, then mixing with the matrix (the polyethylene glycol 400 and the polyethylene glycol 3350 are heated and uniformly mixed in advance), the emulsifier and other components, and homogenizing. The compound selamectin ointment prepared by the invention can realize accurate administration at the edge of the auricle of an animal, and not only can ensure that the medicine is fully absorbed, but also can improve the compliance of animal administration; the composition not only can expel parasites in a broad spectrum, but also has broad-spectrum antifungal activity, and can prevent and treat a plurality of skin diseases of pets.

There is disclosed magnetic covalent organic frameworks (COFs) functionalized with Fe3O4 nanoparticles (Fe3O4@HMN-COF, Fe3O4@MAN-COF, and Fe3O4@SIN-COF) for the efficient removal and degradation of imidacloprid (IMI) from aqueous solutions. These COFs, incorporating nitrogen-rich frameworks and π-electron systems, enhance IMI adsorption through π-π interactions, hydrophobic interactions, and hydrogen bonding. The magnetic properties provided by Fe3O4 nanoparticles allow rapid separation from water using an external magnetic field. The COFs exhibit high surface areas, with BET surface areas reaching up to 910 m2 / g, and high adsorption capacities, up to 600 mg / g. The COFs also exhibit excellent stability, high surface area, and reusability, with minimal loss in performance over multiple cycles. Photocatalytic degradation of IMI is optimized under UV light, with Fe3O4@HMN-COF achieving 98.5% degradation efficiency under specific conditions. These magnetic COFs present a sustainable solution for remediating pesticide-contaminated water, demonstrating effectiveness in various real-world applications.

The invention discloses an Au (at) PtNCs nano-enzyme probe for detecting novel nicotine pesticides as well as a preparation method and application of the Au (at) PtNCs nano-enzyme probe, and belongs to the field of rapid detection of biosensors. The invention provides an Au (at) PtNCs nano-enzyme probe, which is generated by combining AuNCs and PtNCs and coupling with a second antibody, and can effectively realize rapid specific detection of novel nicotine pesticides such as imidacloprid and the like. The linear range of the biosensor probe for detecting the imidacloprid pesticide is 0.1-100 [mu] g / L, and the limit of detection (LOD) can reach 0.127 [mu] g / L and 0.119 [mu] g / L respectively by combining a colorimetric method and a fluorescence method.

The application discloses a kind of MVR coupling multi-effect rectification imidacloprid wastewater resource recovery method and device, including light tower, heavy tower, rectification tower, MVR compressor, MVR falling film reboiler and MVR distilled water tank, after heating, the pesticide wastewater raw material liquid from production workshop enters light tower, after decompression separation in light tower, light component material dichloroethane and methanol obtained at the top of light tower are pumped to plant area recovery system;After light removal by light tower, the liquid is pumped to heavy tower heating and is separated by flash evaporation;Heavy tower produces water vapor, after compression, the enthalpy is increased, and then it is used as heat source to return to the reboiler of heavy tower to heat the circulating liquid, after distillation and concentration, the heavy component liquid is pumped into the rectification tower and is distilled under reduced pressure, after rectification, DMF and a small part of water vapor are pumped to plant area recovery system production line for reuse, and the remaining mother liquor enriched imidazolidine is recovered after cooling.The device can reduce the heat transfer end difference, reduce energy consumption, and realize multi-effect rectification pesticide production wastewater resource recovery.

The present invention provides a mango embryo-promoting agent and an embryo-promoting method, belonging to the field of plant planting technology. The mango embryo-promoting agent includes an inflorescence development stage embryo-promoting solution I; the formula of the inflorescence development stage embryo-promoting solution I includes: MS culture solution, AVG, GA3, imidacloprid, spinetoram, 6-BA, and KH2PO4; the mango embryo-promoting method comprises applying the mango embryo-promoting agent during the mango planting process to promote mango embryo development. The mango embryo-promoting agent and the embryo-promoting method of the present invention can reduce the proportion of mango embryoless fruits to about 80%, a reduction of about 10%.

The invention provides an insecticide delivery preparation based on binary synergistic nanoparticles and a preparation method thereof, an IMI (at) AgNPs (at) CMSNs compound is prepared, and the binary system remarkably overcomes the drug resistance of cotton aphid to imidacloprid by integrating silver nanoparticles (AgNPs) and mesoporous silica nanoparticles (MSNs).

This invention belongs to the field of microbial technology, specifically relating to a strain of Acetobacter peroxide 672 and its applications. The Acetobacter peroxide 672 strain of this invention can enhance the antagonistic activity of Pichia pastoris against Rhizoctonia solani and also antagonizes Colloidal anthracnose, providing a multi-faceted solution for the biological control of crop diseases. Furthermore, the strain possesses the ability to produce indoleacetic acid, which can significantly promote the growth and development of grain crops such as wheat and corn, promote root expansion, enhance nutrient and water absorption, and thus effectively increase biomass. In addition, the strain can tolerate and degrade chemical pesticide components such as imidacloprid and carbendazim, alleviating soil pesticide residue pollution, and can effectively alleviate the inhibitory effects of low pH stress on crops, enhancing their stress resistance. Therefore, the Acetobacter peroxide 672 strain of this invention has significant application value in the biological control of crop diseases, crop growth promotion, soil pesticide residue remediation, and enhancing crop stress resistance.

The utility model relates to the field of agriculture discloses a kind of imidacloprid pesticide light-shielding polyester bottles, including bottle body, the top end of bottle body is fixedly connected with bottle pipe, the outer wall of bottle pipe is threadedly connected with bottle cap, the top end of bottle body is provided with limiting mechanism, the bottom end of bottle cap is equipped with clamping groove, the top end inner wall of bottle cap is fixedly connected with contact pad, the limiting mechanism includes clamping block, the top end of bottle body is fixedly connected with clamping block, the outer wall of clamping block is fixedly connected with pressing plate. In the utility model, by the cooperation of clamping block and clamping groove, two groups of pressing plates are pressed simultaneously to make clamping block flex when opening bottle cap, and it can be separated from clamping groove, and then bottle cap can be rotated, this ingenious design effectively avoids potential harm caused by children easily twisting bottle cap, and ensures the safety of use;When installing, corresponding steps can be operated to complete the stable installation of bottle cap, ensure that the storage environment of pesticide in bottle is stable and sealed well.

The present invention relates to stable synergistic insecticidal composition for synergistic and effective control of various insect pests including entire sucking pests complex. The present invention also relates to a process for preparation thereof.

The invention relates to the technical field of microbial preparations for agricultural environment restoration, and provides a microbial agent for reducing pesticide residues in soil, which is characterized by comprising the following components in parts by weight: 30-60 parts of ochrobactrum having viable count of more than or equal to 5 * 10 < 8 > cfu / g; the spore number is greater than or equal to 2 * 10 < 8 > cfu / g. The final residues of imidacloprid and difenoconazole in the compounded microbial agent are reduced to about 0.20 mg / kg, balanced and efficient removal is realized, and the possible unbalance situation of'degrading one pesticide and remaining one pesticide 'in the traditional method is avoided.

This invention provides an imidacloprid recrystallization refining and purification device, belonging to the technical field of purification devices. It includes a mixing chamber inner liner, with a mixing chamber outer shell fixedly installed outside the inner liner. The inner wall of the mixing chamber outer shell and the outer wall of the mixing chamber inner liner enclose a sealed heating chamber. A crystallization chamber inner liner is provided on the side of the mixing chamber outer shell, and a cooling crystallization tube is provided inside the crystallization chamber inner liner. An adaptive disturbance mechanism is provided inside the crystallization chamber inner liner. This adaptive disturbance mechanism can adjust the disturbance amplitude of the imidacloprid solution according to its crystallization degree. In this invention, by providing an adaptive disturbance mechanism, core components such as a float, a swinging linkage, a telescopic rod, and a stirring plate are integrated. The float senses the density change of the imidacloprid solution in real time at each crystallization stage, generates corresponding buoyancy based on the density, and achieves lifting and lowering. This, in turn, links the swinging linkage to swing around the slider on the limiting post, driving the telescopic rod to extend and retract radially along the sealed tube, ultimately achieving adaptive adjustment of the disturbance amplitude of the stirring plate.

The utility model belongs to the technical field of imidacloprid oil layer wastewater distillation, and discloses a wiped-film evaporation device for imidacloprid oil layer wastewater distillation, which comprises a base and an evaporator, a feeding tank is mounted on one side of the top end of the base, a feeding pipeline is mounted on one side of the feeding tank, a feeding pump is mounted at one end of the feeding pipeline, and the evaporator is mounted at the other end of the feeding pipeline. The evaporator comprises an evaporation barrel, a central rotating shaft, a plurality of film scraping plates, a steam inlet, a gas phase outlet, a liquid phase outlet and a driving assembly, the evaporation barrel is installed at the top end of the base, the central rotating shaft is installed in the evaporation barrel through a bearing seat, and the film scraping plates are installed on the peripheral side of the central rotating shaft at equal intervals; and the steam inlet is formed in the middle position of one side of the evaporation barrel. According to the device, the operation process is simplified, the maintenance cost is reduced, the reliability and durability of equipment are improved, and a new solution is provided for treatment of the imidacloprid oil layer wastewater.

The invention discloses an insecticidal synergistic composition containing tea saponin and application thereof, and belongs to the technical field of pest control. The insecticidal synergistic composition comprises tea saponin and an insecticidal active component, the insecticidal active component comprises but is not limited to one of neonicotinoid insecticides, sulfoxaflor or spinetoram, and the weight ratio of the tea saponin to the insecticidal active component is (1: 1)-(50: 1). The invention discloses an insecticidal synergistic composition containing tea saponin and application of the insecticidal synergistic composition. The insecticidal synergistic composition can be used for effectively preventing and treating plant diseases and insect pests, improving the insecticidal effect and effectively delaying the resistance accumulation of cotton aphids and Frankliniella occidentalis on imidacloprid, sulfoxaflor and spinetoram.

The invention discloses a visual detection method for fruit and vegetable pesticide residues based on a colorimetric array sensor of a smart phone. The preparation method comprises the following specific steps: (1) preparing six types of silver nanoparticles with multifunctional surfaces by taking AgNO3 as a silver source, PVP (Polyvinyl Pyrrolidone), CTAB (Cetyltrimethyl Ammonium Bromide), Tween 80, branched polyethyleneimine, thiomalic acid and L-cysteine as surface modifiers and NaBH4 as a reducing agent and adopting a chemical reduction method; (2) silver nanoparticles are combined with gelatin, and a silver nanoparticle hydrogel patch is prepared; and 3) integrating a smart phone, and constructing a silver nanoparticle colorimetric array intelligent sensor with 1 * 6 sensing element points for visual detection and distinguishing of various pesticide residues on the surfaces of fruits and vegetables. The detection limits of the sensor on cyromazine, chlorpyrifos, imidacloprid, dichlorvos, mancozeb and cartap are 4.9 mg / L, 0.99 mg / L, 0.49 mg / L, 2 mg / L, 3 mg / L and 0.3 mg / L respectively. The method disclosed by the invention has the characteristics of low cost, high sensitivity, strong selectivity, intelligence, portability and the like, and can be used for synchronously detecting and distinguishing various analytes.

A termiticide concentrate comprising a termiticide composition comprising a phenylpyrazole, such as tipronil and a neonicotinoid, such as imidacloprid, wherein the composition is dispersed in an aqueous medium to form the termiticide concentrate. The concentrate containing the combination of active termiticides provides an increased efficacy not exhibited by either active when used alone.

This invention relates to the field of agricultural plant protection technology, specifically to an integrated pest management method for rapeseed suitable for aerial application, comprising the following steps: mixing Bacillus amyloliquefaciens Bam22 with imidacloprid and cyazofamid for aerial application; wherein, the Bacillus amyloliquefaciens Bam22 bacterial solution is diluted to a concentration of (2.5-5.0) × 10⁻⁶. 7 The dosage of cfu / mL was reduced to (6-9) g / mu for imidacloprid and (18-26) g / mu for boscalid. This invention achieves a synergistic effect by combining the pathogen-inhibiting effect of the Bam22 strain with the targeted control function of chemical agents. This significantly reduces the concentration of chemical agents and avoids pesticide damage from aerial spraying while ensuring that the efficacy of pest and disease control is not reduced. At the same time, the growth-promoting function of the Bam22 strain is used to restore the growth status of rapeseed, enhance the plant's stress resistance, and further ensure the yield and quality of rapeseed.

The invention provides a mango embryo-promoting agent and an embryo-promoting method, and belongs to the technical field of plant planting. The mango embryo-promoting agent comprises an inflorescence development stage embryo-promoting solution I; the formula of the embryo promoting solution I in the inflorescence development period comprises an MS culture solution, AVG, GA3, imidacloprid, spinetoram, 6-BA and KH2PO4; according to the mango embryo promoting method, a mango embryo promoting agent is applied in the mango planting process so as to promote embryo development of mangoes. According to the mango embryo promoting agent and the embryo promoting method disclosed by the invention, the embryo-free fruit proportion of mangoes can be reduced to about 80%, and the reduction amplitude is about 10%.

The present invention discloses a method for removing imidacloprid from wastewater using a nitrogen-doped carbon-based zinc-iron diatomic catalyst, comprising the following steps: a first step: preparing a chitosan / zinc-iron dimetallic ion chelate; a second step: preparing a nitrogen-doped carbon-based zinc-iron dimetallic nanocatalyst; a third step: preparing a nitrogen-doped carbon-based zinc-iron diatomic catalyst; and a fourth step: removing imidacloprid using a nitrogen-doped carbon-based zinc-iron diatomic catalyst / PMS system. The method of the present invention has mild reaction conditions, environmentally friendly materials, and high atomic utilization. The catalyst not only has a wide range of applications but also exhibits excellent removal efficiency for various organic pollutants in other wastewaters. Under optimal conditions, the nitrogen-doped carbon-based zinc-iron diatomic catalyst can remove more than 90% of imidacloprid within 10 minutes. Furthermore, the method of the present invention has simple steps, readily available raw materials, and is environmentally friendly, making it suitable for wastewater treatment.

The invention discloses an SERS (Surface Enhanced Raman Scattering) substrate for detecting pesticide residues as well as a preparation method and application thereof, belongs to the technical field of analysis and detection, and provides a preparation method of the SERS substrate for detecting the pesticide residues, which comprises the following steps: inoculating acetobacter xylinum into a culture medium, culturing to obtain a bacterial cellulose membrane, treating the bacterial cellulose membrane with a sodium hydroxide aqueous solution, and drying to obtain the SERS substrate for detecting the pesticide residues. Obtaining a bacterial cellulose substrate; mixing the metal salt aqueous solution with the reducing agent aqueous solution to obtain a precursor solution; and soaking the bacterial cellulose substrate in the precursor solution, standing in a dark place to obtain a bacterial cellulose substrate adsorbed with a precursor, carrying out low-temperature plasma treatment, brewing with ultrapure water, and drying to obtain the SERS substrate. According to the SERS substrate, bacterial cellulose serves as a supporting material, surface modification and nano-structure regulation and control are achieved through a low-temperature plasma technology, the high-density SERS substrate is prepared, and the requirement for rapid and sensitive detection of imidacloprid pesticide residues can be met.

The invention relates to the field of broccoli cultivation, in particular to a broccoli disease-resistant disease-prevention pollination cultivation method which comprises the following steps: acquiring a seed sample, exposing the seed sample to the sun, soaking the seed sample in warm water, sterilizing the soaked seed sample, and mixing imidacloprid wettable powder with the seed sample to obtain pretreated seeds; sandy loam with good drainage is selected, the PH value of the sandy loam is adjusted and controlled within a standard range, a greenhouse of the sandy loam is built, an insect-proof net and an EVA film are selected and covered, and an experimental field where the pretreated seeds are planted is obtained; the handheld electric vibrator is used for pollination, operation is easy and convenient, and efficiency is high. Compared with natural pollination, the method is not limited by climate and pollination insects, can ensure sufficient scattering and uniform spreading of pollen, improves the pollination success rate, reduces the rate of deformed flower balls, increases the fruiting amount and commodity of broccoli, and brings higher economic benefits to farmer households.

The invention discloses a high-quality tea leaf processing technology, and belongs to the technical field of tea leaf processing, and the high-quality tea leaf processing technology comprises the following steps: (1) fresh leaf pretreatment; (2) performing microwave fixation; (3) rolling; and (4) freeze drying. According to the high-quality tea leaf processing technology provided by the invention, the tea leaf processing technology is improved, so that infection of microorganisms is effectively avoided, a very good killing effect on mold, escherichia coli and the like existing in fresh leaves is achieved, and meanwhile, decomposition of bifenthrin, imidacloprid and carbendazim can be promoted, so that the quality of tea leaves is improved, and the quality of the tea leaves is improved. And the health of consumers is guaranteed.

The invention provides a magnetic zinc doped NH2-MIL-125 (Ti) coated FeSx core-shell material and a preparation method thereof, and belongs to the technical field of core-shell materials. In the preparation process, Fe < 2 + > (Zn-2-MeIM-Fe) is fixed on the surface of zinc-doped NH2-MIL-125 (Ti) through coordination of 2-MeIM zinc sites and Fe < 2 + >, the zinc-doped NH2-MIL-125 (Ti) and FeSx is obtained after hydrothermal reaction vulcanization, and compared with the zinc-doped NH2-MIL-125 (Ti) / FeSx material without using 2-MeIM, the zinc-doped NH2-MIL-125 (Ti) and FeSx material has a complete disc-shaped core-shell morphology. Under the protection effect of 2-MeIM, the MOF component is more stable in the vulcanization process, and the proportion of Fe3S4 in FeSx is higher than that of FeS2. The photocatalyst shows higher activity in removal of imidacloprid by photocatalytic activation of peroxymonosulfate (PMS), and the removal rate reaches 99.9% within 10 min. In addition, the catalyst has better cycling stability, and the removal rate of 97.9% is still kept after four times of cycling.

The application relates to the technical field of pesticide residue wastewater treatment, and discloses a biological filtration system suitable for pesticide residue wastewater treatment, which comprises the following components: a photovoltaic component for providing power for the biological filtration system; a control monitoring system for monitoring filtration data and controlling the sewage flow rate of the biological filtration unit; a sewage pool for collecting pesticide residue wastewater; a biological filtration unit adopting a filter box filled with fully mixed and uniform straw, substrate and soil as the filtration unit; and a clean water pool for collecting filtered water after pesticide residue filtration. The biological filtration system can greatly filter and purify pesticide residues in the pesticide residue wastewater, and the degradation rate of imidacloprid at the water outlet after filtration is more than 99%, so that the harm of pesticide residues to the environment and plants can be greatly reduced.

The invention relates to the technical field of pesticide residue detection, in particular to a soil pesticide residue detection method which comprises the following steps: taking a soil sample to be detected, drying and grinding to obtain soil powder; mixing the soil powder with water, MgSO4 and an acetonitrile solution containing 2.5-3.5% of formic acid, carrying out vortex treatment, ultrasonic treatment and centrifugation, then collecting supernate, repeatedly extracting for one time, and then combining the supernate; and filtering the merged supernate by using a filter membrane, and analyzing by using an ultra-high performance liquid chromatography-triple quadrupole tandem mass spectrometry system. According to the method, extraction and chromatography-mass spectrometry conditions are optimized, 25 pesticide residues such as p-nitrophenol, imidacloprid and metabolites thereof can be detected at the same time, and the method has the advantages of being high in extraction efficiency, easy and convenient to operate, high in matrix interference resistance, high in sensitivity, good in accuracy and the like and is suitable for high-throughput detection and analysis of various pesticide residues in soil.

The utility model discloses a kind of imidacloprid suspending agent spraying devices, belong to imidacloprid suspending agent spraying device technical field, its technical scheme main points include electric hybrid car, the inner wall of the electric hybrid car is provided with stirring shaft, the left side of the electric hybrid car is fixedly connected with lifting frame, the left side of the lifting frame is provided with telescopic hose, the bottom of the telescopic hose is movably connected with spraying mechanism, the left side of the electric hybrid car is provided with pump body, solve the existing imidacloprid suspending agent spraying device when using, device moves with poor site adaptability, difficult to flexibly respond different operation scene, and height adjustment, component synergy is insufficient, easily lead to spraying height and target mismatch, uneven distribution of reagent, simultaneously, reagent mixing is mostly dependent on manual stirring of staff, when carrying out a period of spraying work, easy to appear precipitation condition, affect subsequent spraying effect, reduce the problem of pest control quality.

This invention discloses a modified electrode, its preparation method, and its application. The modified electrode comprises a hexabenzo[a]methyl methacrylate (HMM) layer and a working electrode, wherein the HMM layer is loaded on the surface of the working electrode. The HMM-modified material is obtained by in-situ one-step deposition on the electrode surface using electrochemical polymerization technology, thereby improving the detection performance of imidacloprid and solving the problem of poor film-forming properties caused by the poor solubility of carbon materials.

The invention discloses an environment-friendly and efficient cockroach-killing bait and a preparation method thereof, and belongs to the technical field of cockroach-killing bait preparation.The cockroach-killing bait can simulate the natural food effect of cockroaches through the combined action of brown sugar, maltose and fish meal protein, the eating amount of the cockroach-killing bait by the cockroaches is increased by means of the taxis of the cockroaches to saccharides, and therefore the cockroach-killing bait can be used for killing cockroaches. Imidacloprid is used for replacing fipronil, the toxicity of the cockroach killing bait is reduced, imidacloprid is used for playing a role of a nerve poison agent on cockroaches, inhibiting actions and promoting the cockroaches to move disorderly, strong pungent smell generated by fipronil is avoided, family use is facilitated, the enzyme inhibitor can inhibit cell enzyme production in cockroach bodies, and the cockroach killing bait can be used for killing cockroaches. And the penetrating agent can destroy the wax coat on the body surface of the cockroach and improve the penetration efficiency, so that the cockroach is difficult to generate resistance under the multi-direction and multi-target action, the killing efficiency of the cockroach is further improved, the toxicity is reduced, and the cockroach killing agent is environment-friendly and efficient.

The invention belongs to the field of pesticides, and relates to a pesticide composition and application, the pesticide composition comprises an active component A and an active component B, the active component A is any one of imidacloprid, dinotefuran and nitenpyram, the active component B is a compound of formula (I), and the mass ratio of the active component A to the active component B is 1: 64-60: 1. The pesticide composition disclosed by the invention has an excellent prevention and treatment effect on hemiptera pests, has a remarkable synergistic effect under a certain mass ratio, can delay the generation of drug resistance of the pests, and is safe to the environment.

The application discloses a DNA tetrahedron space-mediated immunoassay method and application thereof in detection of imidacloprid residues, relates to the field of pesticide detection, and realizes spatial ordered arrangement of target antibodies by regulating the spatial density of target antibodies through coupling target antibodies on magnetic beads in the form of DNA tetrahedrons, so that a detection probe of MB@TDN@Ab is formed, trace detection of a to-be-detected substance can be realized, and high sensitivity and accuracy are achieved. Compared with a traditional magnetic separation immunoassay method, the detection sensitivity of the application is improved by about 2 times, and the linear range is improved by 1 order of magnitude. When the application is applied to detection of pesticides such as imidacloprid, it has important significance for guaranteeing food safety.