62 results about "Mercaptoethylamines" patented technology

The invention discloses a polyamine type porous polymer as well as a preparation method and application thereof, and belongs to the technical field of synthesis of porous organic polymers. The specific method comprises the following steps: dispersing beta-mercaptoethylamine, a photoinitiator and a porous framework polymer with carbon-carbon double bond connection in a polar organic solvent; under the ultraviolet light initiation condition, the photoinitiator excites beta-mercaptoethylamine to generate sulfydryl free radicals, and the sulfydryl free radicals and the porous framework polymer with carbon-carbon double bond connection are subjected to an addition reaction; and washing and drying the product after the addition reaction to obtain the amino-modified polyamine porous polymer. The preparation method provided by the invention is rapid in reaction, extremely high in reactant utilization rate and simple in post-treatment, and the prepared polyamine type porous polymer has rich adsorption sites, good stability and excellent carbon dioxide adsorption performance, and can be applied to the field of carbon capture and the like.

The present application relates to the technical field of biocatalysis and biosynthesis, and specifically discloses a natural blue pigment and a biosynthesis method therefor. The present application uses metabolically engineered bacteria to express indigoidine synthetase and phosphopantetheinyl transferase, to catalyze glutamine and N-acetylglutamine to biosynthesize a natural blue pigment N-acetylindigoidine, and deduces its molecular structure by means of mass spectrometry, nuclear magnetic resonance and other methods. The present application achieves catalytic synthesis of N-acetylindigoidine from glutamine and N-acetylglutamine in Escherichia coli, Corynebacterium glutamicum, Saccharomyces cerevisiae and Streptomyces. Compared with indigoidine, N-acetylindigoidine has a maximum absorption wavelength of 584 nm, possesses better color brightness, and has more stable coloration that is not easily faded, with a very broad application range and industrial production application prospects.

The present application relates to the technical field of biocatalysis and biosynthesis, and specifically discloses a blue pigment and a biosynthesis method thereof. In the present application, an indigoidine synthetase and a 4′-phosphopantetheinyl transferase are expressed by a metabolically engineered strain to catalyze the biosynthesis of the blue pigment N-acetyl-indigoidine from glutamine and N-acetylglutamine, and a molecular structure of the blue pigment is inferred by mass spectrometry, nuclear magnetic resonance spectroscopy, etc. The present application achieves the catalytic synthesis of N-acetyl-indigoidine from glutamine and N-acetylglutamine in Escherichia coli (E. coli), Corynebacterium glutamicum (C. glutamicum), Saccharomyces cerevisiae (S. cerevisiae), and Streptomyces. Compared with indigoidine, N-acetyl-indigoidine has a maximum absorption wavelength of 584 nm, and a stable color having high brightness that is not easy to fade. Thus, the blue pigment shows an extensive application range and a promising industrial production prospect.

The invention discloses a method for detecting L-cysteine in serum based on N, S co-doped carbon nanodots, and belongs to the field of analysis and detection. The method comprises the following steps: (1) preparing carbon dots by taking beta-mercaptoethylamine and p-phenylenediamine as precursors; (2) after Fe < 3 + > is added into the carbon dot solution, a carbon dot fluorescence quenching phenomenon occurs, and a carbon dot-Fe < 3 + > mixed system is obtained; then adding L-cysteine into the carbon dot-Fe < 3 + > mixed system to gradually recover the fluorescence of the system; and (3) constructing a linear relationship between the concentration of the L-cysteine and the fluorescence recovery degree to obtain the quantitative detection model for the L-cysteine in the serum sample. According to the method, the carbon dots are prepared by taking beta-mercaptoethylamine and p-phenylenediamine as precursors for the first time, quantitative detection of L-cysteine is realized, and the method is low in cost, high in sensitivity, suitable for field rapid detection and relatively high in practical value and popularization prospect.

The present invention relates to the field of fabric technology, and discloses an antibacterial and deodorizing nylon fabric and a preparation method thereof. The preparation method of the antibacterial and deodorizing nylon fabric comprises the following steps: reacting mercaptoethylamine with eugenol to obtain an intermediate product; modifying nano-titanium dioxide with a silane coupling agent KH560 and the intermediate product in sequence, and then mixing with nylon 56, ethylene-methyl acrylate-glycidyl methacrylate terpolymer, and polyhexamethylene guanidine; co-extruding, pelletizing, and melt spinning to obtain modified bio-based nylon 56 filaments; soaking the modified bio-based nylon 56 filaments in a polyacrylic acid / water solution and weaving them into bio-based nylon 56 fabric; and treating the bio-based nylon 56 fabric with an antibacterial and deodorizing finishing solution to obtain the antibacterial and deodorizing nylon fabric. The antibacterial and deodorizing nylon fabric of the present invention has excellent antibacterial and deodorizing properties and washability.

The present invention relates to the technical field of degradable materials, and discloses a PBAT-PLA composite material and its application in a biodegradable heat-shrinkable film. Poly(butylene adipate-co-terephthalate) (PBAT) grafted with maleic anhydride and mercaptoethylamine are subjected to amidation and thermal imidization reactions to synthesize mercapto-grafted PBAT, thereby introducing mercapto groups into the side chains of PBAT. Then, it is subjected to a UV cross-linking reaction with allyl-terminated polylactic acid to obtain PLA-crosslinked PBAT, significantly improving the compatibility between polylactic acid and PBAT, with higher interfacial strength. Using PBAT as the inner and outer layers and PLA-crosslinked PBAT as the intermediate layer, the PBAT-PLA composite material prepared by three-layer coextrusion blow molding has excellent tensile properties and impact resistance and other properties when made into a biodegradable heat-shrinkable film through a blow molding process, and has broad development and applications in biodegradable packaging films, heat-shrinkable films, etc.

The application discloses an anti-fouling cross-linking polymer fracturing fluid and a preparation method thereof, and relates to the technical field of fracturing fluids. In the preparation of the anti-fouling cross-linking polymer fracturing fluid, ethylenediamine is sequentially reacted with methyl acrylate, mercaptoethylamine and vinyl phosphoric acid to obtain an over-branched scale inhibitor; polyvinyl alcohol is reacted with (4-formylphenyl) prop-2-enate to obtain modified polyvinyl alcohol; 1-alkenylimidazole is reacted with bromododecane to obtain an alkenylimidazole salt monomer; acrylamide, acrylic acid, the alkenylimidazole salt monomer and 3-butene-1-amine are polymerized to obtain functionalized polyacrylamide; and the functionalized polyacrylamide, the functionalized polyvinyl alcohol, the over-branched scale inhibitor and deionized water are uniformly mixed to obtain the anti-fouling cross-linking polymer fracturing fluid. The anti-fouling cross-linking polymer fracturing fluid prepared by the application has the advantages of excellent anti-fouling performance, good temperature resistance and self-cross-linking.

The invention relates to the technical field of germplasm resource identification, in particular to a molecular marker, a primer and a kit for identifying golden-screen geese and Taihu Lake geese and application of the molecular marker, the primer and the kit. According to the present invention, the difference between the pantoyl mercaptoethylamine enzyme (VNN1) gene sequences of the local Guizhou golden geese and the Jiangsu Taihu goose is utilized to find that the five polymorphic sites capable of accurately identifying the local Guizhou golden geese and the Jiangsu Taihu goose can be accurately identified, and the primers are designed based on the polymorphic sites so as to identify the local Guizhou golden geese and the Jiangsu Taihu goose; two different varieties of meat geese, namely local white geese in Guizhou and white geese in Taihu Lake, can be quickly and accurately identified, so that a molecular identification means is provided for purifying resources of the local variety of meat geese and accurately screening specific functional genes in germplasm resources of the local meat geese in a pure breeding and breeding process of the local variety of meat geese; moreover, a scientific basis is provided for retention of dominant genes of the local meat goose variety, and considerable economic benefits and use values are achieved.

The invention provides a marker for predicting caries occurrence based on saliva metabolites, which is characterized by comprising 4-acetaminobutyric acid, adipic acid, pantetheine and palmitoyl ethanolamide, and the marker is used for preparing a kit for detecting the caries occurrence risk of a subject. The invention provides four markers in saliva metabolites, and early warning of future caries can be realized in a non-invasive and low-cost manner; according to the basis of detection numerical values of the markers, the morbidity state of the constant dentition caries can be reflected, so that accurate prevention and control of the caries can be realized, and finally the purposes of reducing the morbidity of the caries, helping disease pathological typing and researching drug action targets, accurate medication and pathogenesis can be achieved.

The invention relates to a nitric oxide donor based on heparin sodium and a preparation method and application thereof, the method comprises the following steps: (1) dissolving heparin sodium in a 2-(N-morpholino) ethanesulfonic acid buffer solution, adding an activator, and carrying out a reaction to obtain a reaction solution A; (2) adding beta-mercaptoethylamine into the reaction solution A, and continuously reacting to obtain a reaction solution B; (3) dialyzing the reaction solution B to obtain a solution C; and (4) adding tert-butyl nitrite into the solution C, and reacting to obtain the heparin sodium-based nitric oxide donor. Wherein in the step (1), the activating agent is 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide or hydrochloride of the 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide. According to the prepared heparin sodium-based nitric oxide donor, the nitric oxide release time is prolonged, and the problem that the half-life period of nitric oxide is short is solved.

The invention discloses a toughened single-component epoxy adhesive and a preparation method thereof, and belongs to the technical field of epoxy adhesives. The invention relates to a toughening type single-component epoxy adhesive and a preparation method thereof. The flexible epoxy resin composition comprises the following raw material components in parts by mass: 18-20 parts of an epoxy resin base material, 21-23 parts of flexible epoxy resin, 24-26 parts of elastomer modified epoxy resin, 14-16 parts of shell-core structure rubber, 1-3 parts of a thixotropic agent, 5-7 parts of a first curing agent, 3-4 parts of a second curing agent, 3-4 parts of an accelerant, 0.3-0.5 part of a coupling agent and 5-8 parts of a heat stabilizer. Wherein the first curing agent comprises a melamine curing agent; the second curing agent is obtained by sequentially reacting 5 ', 5-diallyl-2, 2'-biphenol with phenylphosphonic dichloride and then reacting with mercaptoethylamine; the heat stabilizer is obtained by reacting fullerene with unsaturated alcohol; the material prepared by the invention has better mechanical properties and high temperature resistance.

The present application relates to a kind of phospholipid choline structural compounds and its preparation method, the preparation method of the phospholipid choline structural compounds includes the following steps: with hydroxyethyl methacrylate and beta-mercaptoethylamine as raw material, intermediate M1 is obtained by reaction at room temperature;Intermediates M1 and acrylate are added to obtain intermediate M2;Intermediate M2 and 2-chloro-2-oxygen-1,3,2-dioxaphospholane are reacted to obtain intermediate M3;Then intermediate M3 and chain or cyclic tertiary amine are reacted to obtain phospholipid choline compound.The phospholipid choline compound obtained by the method of the present application is simple, mild, can be combined with many compound fragments on the market, and the product is rich and varied.Such phospholipid choline compound can be selectively delivered to the spleen site for the delivery of nucleic acid drugs.

The present application relates to a kind of heparin sodium-based nitric oxide donor and its preparation method and application, the method includes the following steps: (1) heparin sodium is dissolved in 2-(N-morpholino) ethanesulfonic acid buffer solution, adding activating agent, reaction is carried out, and reaction liquid A is obtained;(2) to reaction liquid A, continue to react to obtain reaction liquid B by adding β-mercaptoethylamine;(3) reaction liquid B is dialyzed, and solution C is obtained;(4) to solution C, nitrous acid tert-butyl ester is added, and the heparin sodium-based nitric oxide donor is obtained by reaction;Wherein, in step (1), the activating agent is 1-ethyl-3-(3-dimethylaminopropyl) carbonyl diimide or its hydrochloride salt.The heparin sodium-based nitric oxide donor prepared in the present application prolongs the release time of nitric oxide, and solves the problem of short half-life of nitric oxide.

This invention discloses a UV waterproof ink and its preparation method, belonging to the field of UV waterproof ink technology. The invention uses the esterification product of linoleic acid and linoleyl alcohol as the A-phase component of the ink, and simultaneously uses terminal mercapto polyethylene glycol as the B-phase component. The thiol-ene click reaction is utilized to accelerate the film-forming speed of the ink under ultraviolet light. The polyethylene glycol backbone introduced into the structure is integrated into the three-dimensional network formed after ink curing during the UV curing process, improving the ink viscosity and enhancing the adhesion between the ink and the printing medium. Furthermore, a self-made antioxidant is formed by rosmarinic acid and mercaptoethylamine under ultraviolet light irradiation and added to the ink to efficiently capture oxygen, protect other components in the ink, and extend the ink's lifespan. The UV waterproof ink prepared by this invention has a high UV curing rate and strong waterproof, temperature-resistant, and antioxidant properties.

The present application relates to the technical field of antibacterial drugs, and specifically discloses a pleuromutilin derivative and a use thereof, wherein the pleuromutilin derivative has a structure of being connected to a side chain of C14 of pleuromutilin by a mercaptoethylamine, piperazine or oxygen atom from a dihydroflavone or oxime ether derivative thereof. The present application introduces dihydroflavone (naringenin and hesperetin) and oxime ether derivatives thereof having antibacterial effects into the side chain of C14 of pleuromutilin by taking pleuromutilin as a raw material. The dihydroflavone and oxime ether derivatives thereof have great potential as an advantageous structural unit due to their unique C6-C3-C6 basic skeleton (C2 and C3 are single bonds) and extensive antibacterial activity. The dihydroflavone and oxime ether derivatives thereof are combined with pleuromutilin to synthesize a plurality of dihydroflavone pleuromutilin derivatives having excellent antibacterial activity. The present application provides a new choice for designing a new generation of pleuromutilin derivatives by a hybrid strategy, improving drug properties while improving activity, and providing an anti-infective drug.

The invention discloses UV waterproof ink and a preparation method thereof, and relates to the technical field of UV waterproof ink. An esterification product of linoleic acid and linoleyl alcohol is used as an A-phase component of the ink, mercapto-terminated polyethylene glycol is used as a B-phase component of the ink, the film-forming speed of the ink under the action of ultraviolet light is increased by utilizing a thiol-ene click reaction, and a polyethylene glycol skeleton introduced into the structure has a good film-forming effect. In the ultraviolet curing process, the photoinitiator is connected into a three-dimensional network formed after the ink is cured, the viscosity of the ink is improved, the binding force between the ink and a printing medium is improved, rosmarinic acid and mercaptoethylamine are used for forming a self-made antioxidant under ultraviolet irradiation, the self-made antioxidant is added into the ink, oxygen is efficiently captured, other components in the ink are protected, and the ink has the advantages of being environmentally friendly and free of toxic and side effects. The service life of ink is prolonged. The prepared UV waterproof ink is high in ultraviolet curing rate, waterproof, temperature-resistant and high in oxidation resistance.

The invention relates to the field of freeze-dried powder, and discloses collagen composite freeze-dried powder for fading lines as well as preparation and application of the collagen composite freeze-dried powder. The collagen composite freeze-dried powder comprises recombinant XVII type human collagen, a chitosan derivative, superoxide dismutase, mannitol, a plant extract, palmitoyl pentapeptide-4 and water, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide are used as cross-linking agents, and carboxymethyl cellulose quaternary ammonium salt and aminated chitosan are subjected to an amidation reaction, so that the chitosan derivative is prepared; the carboxymethyl cellulose quaternary ammonium salt is synthesized by reacting carboxymethyl cellulose and 3-chloro-2-hydroxypropyl trimethyl ammonium chloride in an aqueous solution; the aminated chitosan is prepared by using acryloyl chitosan prepared by reaction of acryloyl chloride and chitosan and further performing thiol-ene click reaction on the acryloyl chitosan and beta-mercaptoethylamine. The collagen composite freeze-dried powder prepared by the preparation method disclosed by the invention has good anti-wrinkle and firming effects and antibacterial performance.

The application discloses a preparation method of UV waterproof ink and relates to the technical field of UV waterproof ink. The esterification product of linoleic acid and linoleyl alcohol is used as the A-phase component of the ink, and the terminal mercapto polyethylene glycol is used as the B-phase component of the ink, the thiol-ene click reaction is used to accelerate the film forming speed of the ink under the action of ultraviolet light, the polyethylene glycol skeleton is introduced into the three-dimensional network formed after the ink is solidified in the process of ultraviolet curing, the viscosity of the ink is improved, the bonding force between the ink and the printing medium is improved, the rosemary acid and mercaptoethylamine are used to form a self-made antioxidant under the irradiation of ultraviolet light, the antioxidant is added into the ink, oxygen is efficiently captured, other components in the ink are protected, and the service life of the ink is prolonged. The UV waterproof ink prepared by the application has high ultraviolet curing rate, high waterproof performance, high temperature resistance and high oxidation resistance.

The invention discloses phosphopantetheinyl transferase 3X32, a coding gene thereof, a recombinant vector containing the gene and application of recombinant bacteria, and belongs to the technical field of gene engineering. In order to improve the yield of natural products such as polyketone and non-ribosome peptide, the efficient phosphopantetheinyl transferase 3X32 is excavated from a database by means of bioinformatics analysis and the like, the amino acid sequence of the transferase 3X32 is as shown in SEQ ID NO.1, and the nucleotide sequence of the encoding gene of the transferase 3X32 is as shown in SEQ ID NO.2. By constructing a recombinant vector and recombinant bacteria containing the encoding gene of the enzyme, the yield of natural products such as polyketone, polyether, non-ribosome peptide and the like can be effectively increased by over-expressing the enzyme.

The invention discloses plant-based water-based ink and a preparation method thereof, and relates to the field of water-based ink. When the plant-based water-based ink is prepared, microcrystalline cellulose is subjected to formylation, then is grafted with 2-mercaptoethylamine and then is bonded with nano-silver to prepare modified cellulose; the preparation method comprises the following steps: reacting octamethylcyclotetrasiloxane, 2-methyl ester ethyl dimethoxy methylsilane and pentamethyldisiloxane, and grafting hydrazine hydrate to prepare modified silicone oil; uniformly mixing poly (butylene adipate), castor oil, isophorone diisocyanate and the modified silicone oil to obtain a modified polyurethane emulsion; the preparation method comprises the following steps: reacting aminomalonic acid with 3, 5-di-tert-butyl-4-hydroxybenzaldehyde, and uniformly mixing with carbon black powder and 1, 5-dihydroxy-3-pentanone to obtain modified carbon black; uniformly mixing the modified polyurethane emulsion, the color paste, the flatting agent and the modified cellulose to obtain the plant-based water-based ink. The prepared plant-based water-based ink has excellent antistatic property, wear resistance and durability.

The invention relates to the technical field of polyolefin, and discloses a preparation method of a self-repairing modified polyolefin hose material for a water supply pipe, the preparation method comprises the following steps: taking mercaptoethylamine, acrylic acid, chloropropene and the like as raw materials, carrying out a series of reactions to prepare an intermediate product 2, carrying out two times of reaction on the intermediate product 2 and nano-zinc oxide, 4-amino-2, 2, 6, 7, 8-tetramethyl-1, 3, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3, 4-tetramethyl-1, 3-tetramethyl-1, 3- The self-repairing modified polyolefin hose material for the water supply pipe is obtained by reacting nano-zinc oxide-based gemini quaternary ammonium salt and hindered amine modified gemini quaternary ammonium salt with 2, 2, 6, 6-tetramethylpiperidine, introducing the nano-zinc oxide-based gemini quaternary ammonium salt and hindered amine modified gemini quaternary ammonium salt into polypropylene and polyethylene, uniformly mixing, melting and blending, extruding and granulating, and carrying out injection molding. The prepared modified polyolefin hose material has excellent self-repairing performance, antibacterial performance, anti-aging performance and mechanical performance, and the service life of a water supply pipe can be prolonged when the modified polyolefin hose material is applied to the water supply pipe.

The present invention relates to the technical field of topcoats, and discloses a quick-drying corrosion-resistant topcoat and a preparation process thereof. The quick-drying corrosion-resistant topcoat is composed of component A and component B; wherein component A includes the following raw materials: epoxy acrylate resin, anti-corrosion resin, mercapto-dimethylbenzene, defoamer, antioxidant, emulsifier, and leveling agent; component B includes the following raw materials: photoinitiator and deionized water; wherein the anti-corrosion resin is prepared by reacting a modified chloroacetic acid resin with 2-amino-5-fluorobenzotrifluoride; the modified chloroacetic acid resin is prepared by reacting a hydroxychloroacetic acid resin with 2-chloroacrylic acid; the mercapto-dimethylbenzene is prepared by reacting a modified dimethylbenzene with mercaptoethylamine; and the modified dimethylbenzene is prepared by intercalating dimethylbenzene with (3-carboxypropyl)trimethylammonium chloride. The topcoat prepared by the present invention has excellent quick-drying properties, wear resistance, and corrosion resistance, greatly expanding the application field of the topcoat.

The invention discloses a preparation method of an electrode catalyst for preparing ethylene by electrochemical reduction of carbon dioxide, which comprises the following steps: step 1, ultrasonically dispersing a conductive carrier in a dispersant to form a carrier dispersion liquid; step 2, stirring the carrier dispersion liquid obtained in the step 1 under a water bath heating condition until the carrier dispersion liquid is uniformly mixed; step 3, adding mercaptoethylamine, uniformly dispersing, then adding a copper salt trihydrate copper solution precursor, and heating and stirring in a water bath until the mixture is uniformly mixed; and 4, dropwise adding a reducing agent, and heating and stirring in a water bath to obtain the electrode catalyst. According to the catalyst for loading the copper-based nanoparticles on the conductive carrier prepared by the preparation method disclosed by the invention, the problem of relatively large internal resistance caused by stacking of the copper-based nanoparticles is reduced through support expansion of the conductive material.

The invention discloses a preparation method of UV waterproof ink, and relates to the technical field of UV waterproof ink. An esterification product of linoleic acid and linoleyl alcohol is used as an A-phase component of the ink, mercapto-terminated polyethylene glycol is used as a B-phase component of the ink, the film-forming speed of the ink under the action of ultraviolet light is increased by utilizing a thiol-ene click reaction, and a polyethylene glycol skeleton introduced into the structure has a good film-forming effect. In the ultraviolet curing process, the photoinitiator is connected into a three-dimensional network formed after the ink is cured, the viscosity of the ink is improved, the binding force between the ink and a printing medium is improved, rosmarinic acid and mercaptoethylamine are used for forming a self-made antioxidant under ultraviolet irradiation, the self-made antioxidant is added into the ink, oxygen is efficiently captured, other components in the ink are protected, and the ink has the advantages of being environmentally friendly and free of toxic and side effects. The service life of ink is prolonged. The prepared UV waterproof ink is high in ultraviolet curing rate, waterproof, temperature-resistant and high in oxidation resistance.

The present application relates to the technical field of solar cells, in particular to a buried bottom modification material for flexible perovskite solar cells and a preparation method and application thereof, wherein polyacrylic acid and its derivatives and mercaptoethylamine or its analogues are used as main reaction raw materials, a buried bottom modification material containing mercapto is generated through cross-linking reaction, the buried bottom modification material is spin-coated on a hole transport layer to prepare a buried bottom interface layer, and a flexible perovskite solar cell containing the buried bottom interface layer is prepared based on the buried bottom interface layer. The present application uses the above-mentioned buried bottom modification material for flexible perovskite solar cells and a preparation method and application thereof, and uses the polymer containing mercapto as the buried bottom modification material in the transverse flexible perovskite solar cell, so that the efficiency and mechanical stability of the flexible perovskite solar cell are improved.

The invention relates to a phosphatidylcholine structure compound and a preparation method thereof, and the preparation method of the phosphatidylcholine structure compound comprises the following steps: taking hydroxyethyl methylacrylate and beta-mercaptoethylamine as raw materials, and reacting at room temperature to obtain an intermediate M1; carrying out addition reaction on the intermediate M1 and acryloyl ester to obtain an intermediate M2; the intermediate M2 and 2-chloro-2-oxo-1, 3, 2-dioxaphospholane are subjected to a reaction, and an intermediate M3 is obtained; and reacting the intermediate M3 with chain or cyclic tertiary amine to obtain the phosphatidylcholine compound. The phosphatidylcholine compound obtained by the method disclosed by the invention is simple in reaction and mild in condition, can be combined with numerous compound fragments on the market, and is rich and diversified in products. The phosphatidylcholine compound is used for delivery of wrapped nucleic acid drugs and can be selectively delivered to the spleen part.

The invention belongs to the field of medicinal chemistry, and discloses an aromatic pleuromutilin derivative with an antibacterial effect as well as a preparation method and application of the aromatic pleuromutilin derivative. The pleuromutilin is structurally modified, aromatic group modification is further increased through a reductive amination method after mercaptoethylamine is introduced into a C-14 side chain, and the structural formula of the pleuromutilin is shown in the specification. Research on an antibacterial mechanism finds that the series of derivatives can effectively interfere with expression of bacterial protein and show unique and excellent antibacterial activity, and the pleuromutilin can be applied to preparation of antibacterial agents. Compared with pleuromutilin in the prior art, most of the pleuromutilin compounds have antibacterial activity on staphylococcus aureus, escherichia coli, salmonella, micrococcus luteus and enterococcus faecalis which are common in in-vitro clinical application, hardly generate drug resistance, have stable safety and are expected to be further optimized into lead compounds of novel antibiotics.

This invention provides a composite aerogel for adsorbing Cu in water and its preparation method, belonging to the fields of new materials and energy conservation and environmental protection. The specific method is as follows: First, graphene oxide (GO) is synthesized, then molybdenum disulfide is aminated in a mercaptoethylamine solution, and a methanol solution of polyetherimide at a specific mass concentration is added to obtain MoS2-PEI. Finally, the prepared MoS2-PEI and GO are ultrasonically mixed, and the resulting product is immersed in an aqueous solution of zinc acetate dihydrate, followed by multiple growth cycles in an aqueous solution of 2-methylimidazole. This yields a ZIF-8 / MoS2-PEI / GO aerogel. This composite aerogel uses GO as a carrier and can selectively adsorb Cu, achieving efficient purification of the heavy metal Cu. This invention features low energy consumption, high separation efficiency, one-step solidification separation, and no secondary pollution, effectively avoiding the drawbacks of redundant separation operations and large waste volumes in traditional methods.

The present invention discloses a selective herbicide based on bispyribac, and its preparation method and application. The herbicide has the following molecular structure expression, and its preparation method includes: mixing bispyribac and mercaptoethylamine hydrochloride in a solvent, adding a catalyst and an acid binding agent, and heating to 120-170°C for reaction; after the reaction, purifying to obtain a product; the bispyribac derivatives in the present invention have significantly improved selective weed control ability against grass weeds, and can ensure the weed control effect when used at a lower concentration, which fundamentally controls the probability of phytotoxicity in cereal crops and reduces the degree of damage to crop growth caused by the drug;.

The application discloses a method for detecting L-cysteine in serum based on N and S co-doped carbon nanodots, and belongs to the field of analysis and detection. 3+ After that, carbon dot fluorescence quenching phenomenon appears, and a carbon dot-Fe 3+ mixed system is obtained. 3+ After L-cysteine is added into the carbon dot-Fe The application first uses beta-mercaptoethylamine and p-phenylenediamine as precursors to prepare carbon dots, realizes quantitative detection of L-cysteine, has low cost, high sensitivity, is suitable for on-site rapid detection, and has high practical value and popularization prospect.