10 results about "Malathion" patented technology

The invention relates to a pesticide residue detection test strip as well as a preparation method and application thereof, in particular to a rapid detection technology based on an enzyme inhibition method and a chitosan non-woven fabric carrier. The test strip can specifically detect organophosphorus and carbamate pesticides such as trichlorfon, malathion and phoxim through the enzyme activity inhibition principle, the detection limit of the pesticides such as phoxim is as low as 0.1 mg / kg, the developing intensity is in negative correlation with the pesticide concentration, and semi-quantitative judgment can be achieved. The preparation process is simple, the chitosan non-woven fabric is adopted as a fixed carrier, the material is environment-friendly and degradable, the enzyme activity recovery rate reaches 90%, the stability is excellent (the enzyme activity recovery rate can be preserved for 60 days at the temperature of 4 DEG C in a dark place), sample pretreatment is not needed in detection operation, a result can be obtained at the normal temperature for 15 min, the stability and repeatability are good, and the problems that a traditional instrument is high in detection cost and long in time consumption are solved; the method has a remarkable basic popularization value.

The invention relates to the technical field of organic detection, in particular to a nanoparticle modified quantum dot MOF material and a preparation method and application thereof. A zirconium-based double-ligand metal organic framework material is used as a carrier, a co-reaction accelerant Ti3C2 quantum dot is modified to enhance the electrochemical luminescence reaction efficiency, and copper-gold nanoparticles are loaded to amplify signals. The nanoparticle modified quantum dot MOF material provided by the invention can be prepared into an aptamer biosensor for accurately identifying malathion, and has high sensitivity and high selectivity. According to the invention, a nanoparticle modified quantum dot MOF material is coupled and combined with an aptamer, and an aptamer probe with high electrochemical luminescence activity and specific sensitivity to malathion is constructed. When the malathion acts on the aptamer probe, the malathion is combined with the aptamer in a high affinity manner, the aptamer probe is separated from the surface of the electrode, and meanwhile, an electrochemical luminescence signal is changed, so that the malathion residue in the agricultural product is rapidly detected.

This invention relates to the field of food safety testing technology and discloses an automatic matching method for batch parameters of malathion test cards with QR code traceability. The method includes collecting the dual-matrix Lab color space values ​​of the QR code label paper and NC film in the test card, constructing an aging decay function relationship table and an initial coupling correlation matrix, and encoding an encrypted QR code. During testing, a single frame of original image is acquired to extract real-time chromaticity feature vectors of the dual-matrix region, and the aging feature modulus is calculated by combining it with the initial coupling correlation matrix. Based on the aging feature modulus, the aging decay function relationship table is queried to dynamically correct the initial standard curve parameters and generate a real-time standard curve, thereby outputting the malathion concentration. This invention constructs an intrinsic aging indication mechanism through dual-matrix chromaticity difference, achieving adaptive reconstruction of the standard curve according to the aging state of the test card, ensuring detection accuracy throughout the entire lifecycle.

The invention belongs to the technical field of feed processing, and discloses a compound bacterium enzyme additive for improving the quality of corn green and yellow silage feed and application, the additive comprises a core functional group and an optional functional group; the core functional group consists of xylanase and lactobacillus plantarum, the activity of the xylanase is 100000Ug, and the addition amount of the xylanase is 0.25 g / kg; the activity of the lactobacillus plantarum is 1 * 10 CFUg, and the addition amount is 1mL / kg; the optional functional group is cellulase, the activity of the cellulase is 20000Ug, the addition amount of the cellulase is 0.1 g / kg, and the optional functional group is used for reducing malathion residues in the silage corn. The green / yellow silage treated by the method has the fragrance of aromatic wine, the stem and leaf structure is well kept, the color is consistent with that of raw materials, and the sensory score reaches 20 (superior grade) which is far superior to the medium grade of a control group.

The invention belongs to the field of environment detection, and particularly relates to application of bimetal Pt / Co nano-enzyme to instant portable detection of malathion. The bimetallic Pt / Co nano-enzyme for malathion detection is ZIF-67NF loaded with Pt nanoparticles and has peroxidase activity, nucleotide can enhance the peroxidase activity of the bimetallic Pt / Co nano-enzyme under an alkaline condition, a colorimetric reaction is started by combining the inhibition effect of malathion on alkaline phosphatase and the decomposition effect of the alkaline phosphatase on the nucleotide, and the sensitivity of malathion detection is improved. The method is used for detecting malathion, has the advantages of low detection cost, instantaneity, accuracy and the like, and provides a new method for detecting malathion.

The invention discloses a method for preparing malathion by adopting a solid acid catalyst, and belongs to the technical field of organophosphorus pesticide synthesis. O, O-dimethyl dithiophosphoric acid and diethyl maleate are used as raw materials, solid acid is used as a catalyst, and addition reaction is performed to prepare malathion; the solid acid is selected from one or more of ethylenediaminetetraacetic acid, sulfonated carbon, sulfate zirconium oxide and silicon-aluminum oxide. The process provided by the invention breaks through the technical bottleneck of catalyst selection in malathion synthesis, solves the environmental protection pain point and the efficiency bottleneck in the prior art through innovative application of specific solid acid, and has the advantages of recoverable catalyst, high raw material conversion rate, excellent product purity, simple process, low energy consumption and the like. The method does not need to greatly transform the existing industrial production device, can be directly popularized and applied, can effectively reduce the production cost, reduce the environmental pollution and improve the product competitiveness, is suitable for large-scale production of agricultural, hygiene and epidemic prevention and medicinal malathion, and has wide industrial application prospects and remarkable economic, social and environmental benefits.

The application discloses a time sequence control type composite pollution repair material for facility agriculture soil and a preparation method and application thereof, and belongs to the technical field of soil repair. The repair material is a three-layer core-shell structure particle, which comprises, from inside to outside, an inner core layer composed of biodegradable polyester wrapping pesticide degrading enzyme and pesticide adsorbent, a middle layer composed of water / ion responsive hydrogel wrapping heavy metal fixing agent and oxidative degradation catalyst, and an outer shell layer composed of brittle degradable polymer wrapping micro / nano plastic surface capping agent. The repair material realizes time sequence and synergistic repair of micro / nano plastic, available Cd and malathion by triggering the release of the outer shell layer through plowing mechanical force, triggering the slow release of the middle layer through irrigation water response, and triggering the release of the inner core layer through rhizosphere microbial enzyme. The material has simple preparation process, convenient application and good application prospect.

The application provides a beta-cyclodextrin modified electrochemiluminescence gold cerium bimetallic nanocluster, a preparation method and application thereof in electrochemiluminescence-impedance dual-mode detection of malathion, and relates to the field of malathion detection. The preparation method of the beta-cyclodextrin modified electrochemiluminescence gold cerium bimetallic nanocluster comprises the following steps: after gold source and cerium source are incubated with methionine for the first time in an alkaline environment, the gold source and the cerium source are dispersed in an ammonia solution to be incubated for the second time; and finally, the gold source and the cerium source are incubated with NH2-beta-cyclodextrin for the third time to obtain the beta-cyclodextrin modified electrochemiluminescence gold cerium bimetallic nanocluster. The beta-cyclodextrin modified electrochemiluminescence gold cerium bimetallic nanocluster is used as an ECL luminophore, and a sensor using triethylamine as a co-reaction agent is applied to the detection of malathion, and the sensor has high sensitivity, selectivity, stability, realizes ECL and EIS dual-mode cooperative detection and mutual verification, and has the advantages of simple operation and good repeatability.

The application provides a beta-cyclodextrin modified electrochemiluminescence gold cerium bimetallic nanocluster, a preparation method and application thereof in electrochemiluminescence-impedance dual-mode detection of malathion, and relates to the field of malathion detection. The preparation method of the beta-cyclodextrin modified electrochemiluminescence gold cerium bimetallic nanocluster comprises the following steps: after gold source and cerium source are incubated with methionine for the first time in an alkaline environment, the gold source and the cerium source are dispersed in an ammonia solution to be incubated for the second time; and finally, the gold source and the cerium source are incubated with NH2-beta-cyclodextrin for the third time to obtain the beta-cyclodextrin modified electrochemiluminescence gold cerium bimetallic nanocluster. The beta-cyclodextrin modified electrochemiluminescence gold cerium bimetallic nanocluster is used as an ECL luminophore, and a sensor using triethylamine as a co-reaction agent is applied to the detection of malathion, and the sensor has high sensitivity, selectivity, stability, realizes ECL and EIS dual-mode cooperative detection and mutual verification, and has the advantages of simple operation and good repeatability.

The application discloses a dimethoate molecular imprinting photoelectrochemical sensor based on a multi-center affinity MOF, takes dimethoate (DIM) as a target analyte, and uses PCN-224 (Zn) as not only a photoelectric signal generation center of the sensor, but also a matching center of a molecular imprinting cavity, so that multiple recognitions are performed on the target, and the affinity effect of Lewis acid center sites (Zn (II), Zr (IV)) and the synergistic effect of spatial matching of the molecular imprinting ensure accurate capture of the DIM; through a competition strategy of taking dopamine as an electron donor and an interface probe, a high-selectivity PEC sensor for trace DIM is finally constructed, and the method can be popularized to other organophosphorus chemical structures, thereby providing a new direction for multifunctional application of photoactive MOFs.