6 results about "Phoxim" 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 application discloses a COF-based nanoscale enzyme and a preparation method thereof, a COF-based nanoscale enzyme sensor and a detection method of phoxim residues, and relates to the technical field of pesticide detection. The technical scheme in the application designs a COF-based nanoscale enzyme sensor and a method for detecting phoxim residues by using the sensor. The COF-based nanoscale enzyme sensor in the application is synergistically designed by valine functionalization and MnO2 nanoscale enzyme loading, provides rich recognition sites and catalytic active centers, significantly promotes interface electron transfer, and thus amplifies the detection signal. In addition, a machine learning module is introduced in the detection method, which can accurately analyze complex electrochemical signals, effectively distinguish target signals from interference noise, significantly improve the accuracy, reproducibility and anti-interference ability of detection, and provide a universal solution for rapid detection of various samples and multiple targets.

The invention relates to a preparation method of adjustable and controllable fluorescent carbon dots RhB-Na-CDs and application of the adjustable and controllable fluorescent carbon dots RhB-Na-CDs. Rh B and NaOH are dissolved in tetrahydrofuran or DMF or ethanol or methanol or acetone solvent according to the feeding ratio of nNaOH / nRhB being 1: 1.2-6.5, coarse carbon dots are obtained through the steps of high-temperature reaction, centrifugation, filtration, dialysis, freeze drying and the like, and isocratic dichloromethane and methanol are eluted according to the ratio of V dichloromethane to V methanol being 1-10: 1. The method comprises the following steps: by adopting a thin layer chromatography, collecting yellow fluorescence for elution, and concentrating under vacuum to obtain purified RhB-Na-CDs, and the RhB-Na-CDs can efficiently sensitize orange fluorescence only for phoxim. The Rh B-Na-CDs are used for detecting phoxim residues in vegetables and fruits under the condition that pH is equal to 7, the Rh B-Na-CDs are in a linear relation when the phoxim concentration ranges from 0 micromol / L to 25 micromol / L and the phoxim concentration ranges from 25 micromol / L to 250 micromol / L, the low detection limit (LOD) of the Rh B-Na-CDs to phoxim is 4.486 nmol / L and is far lower than the detection limit required by the national standard GB / T 5009.102-2003, and the Rh B-Na-CDs can be used for rapidly detecting the phoxim residues in the vegetables and fruits.

The invention belongs to the technical field of pesticides, and particularly relates to a phoxim-containing pesticide fertilizer preparation method, which comprises: (1) mixing phoxim, a part of a solvent and a surfactant to obtain an oily mixture A; (2) uniformly mixing the fertilizer component and the filler, and granulating to obtain mixed particles B; and (3) wrapping the mixture A on the surfaces of the mixed particles B by using a wrapping granulation method to form stable particles, thereby obtaining the medical fertilizer. Various components in the medical fertilizer have the effects of preventing and treating underground pests, providing nutrition, promoting growth, enhancing immunity, providing application effects and the like, so that the effects of improving crop growth and preventing and treating underground pests are achieved.

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.

The application provides a multifunctional Aenibacillus terrae capable of degrading organophosphorus pesticides and resisting diseases, the strain is Aenibacillus terrae, and is preserved in the China General Microbiological Culture Collection Center with a preservation number of CGMCC No. 30973. The strain can degrade organophosphorus pesticides, including profenofos, malathion, diazinon, phoxim and fenthion, and the degradation effect on diazinon is the best; the strain can inhibit the growth and development of southern root-knot nematodes, and prevent tomato root knot disease caused by the nematodes; the strain can antagonize fusarium oxysporum, and prevent tomato fusarium wilt caused by the fusarium oxysporum; and the strain can increase the supply of soil available phosphorus, and promote the growth of leafy vegetables.