53 results about "Anhydrous sodium acetate" patented technology

The invention discloses a preparation method and application of magnetic montmorillonite modified sludge-based hydrothermal carbon, and belongs to the technical field of sludge carbonization. The method comprises the following steps: (1) mixing sludge, montmorillonite and ethylene glycol to obtain montmorillonite sludge dispersion liquid; (2) adding ferric trichloride, lauryl sodium sulfate and anhydrous sodium acetate into the montmorillonite sludge dispersion liquid to obtain montmorillonite sludge mixed liquid; (3) carrying out hydrothermal reaction on the montmorillonite sludge mixed solution, and cooling after the reaction is completed to obtain a hydrothermal product; and (4) respectively washing the hydrothermal product with deionized water and absolute ethyl alcohol, carrying out suction filtration, drying and grinding to obtain the magnetic montmorillonite modified sludge-based hydrothermal carbon. The montmorillonite modified sludge-based hydrothermal carbon is prepared by taking sludge as a raw material, modifying and dispersing the sludge in ethylene glycol through montmorillonite, then carrying out hydrothermal reaction, washing, carrying out suction filtration and drying, and the hydrothermal carbon has an excellent pore structure and adsorption performance and is particularly suitable for adsorbing and removing methylene blue in a water body.

The invention provides an organoid basic culture medium and a method for maintaining and promoting organoid growth, and the organoid basic culture medium comprises a basic culture medium and an additive, the additives comprise taurine sodium 3-hydroxybutyrate, taurine, sodium hypoxanthate, creatinine, L-ornithine, urea, L-sodium lactate, putrescine dihydrochloride, anhydrous citric acid, ethanolamine, N-acetylglycine, alpha ketoglutaric acid, formic acid, malic acid, malonic acid, succinic acid, uric acid, ammonium metavanadate, manganese dichloride, sodium selenite, creatine, glycerol and uridine. Anhydrous sodium acetate and para aminobenzoic acid. When the organ-like basic culture medium is used for treating the organ-like, the activity of the organ-like can be effectively maintained, and basic nutrition and metabolism requirements of the organ-like can be provided, so that the organ-like has the advantages of high activity, fast proliferation and long-term stable passage, and is suitable for various types of organs and wide in application.

The invention discloses a preparation method and an evaluation method of a high-stability ferric oxide / graphene nano composite material, and relates to the technical field of nano materials. The preparation method comprises the following steps: dissolving expanded graphite in DMF (Dimethyl Formamide), standing for one night, carrying out ultrasonic treatment on a mixture in an ice bath environment for 2.5-3 hours, and adding water to prepare a multi-layer graphene solution; respectively weighing FeCl3. 4H2O and anhydrous sodium acetate, adding the FeCl3. 4H2O and the anhydrous sodium acetate into the multilayer graphene solution, and violently stirring to obtain a reaction precursor solution; carrying out heat preservation on the reaction precursor solution in a water bath, cooling to room temperature, and carrying out high-speed centrifugal separation to obtain a wet sample; and washing the wet sample with absolute ethyl alcohol and purified water, and drying to obtain reddish brown powder. The Fe2O3 particles are loaded on the graphene, the two-dimensional lamellar structure, high thermal conductivity and high dispersity of the graphene can effectively prevent agglomeration of the nano particles, uniform distribution of the particles is guaranteed, the stability of the nano material in an aqueous solution is improved, the light absorption capacity of the nano material is improved, and the performance of the material in photothermal conversion is more stable.

The present application relates to a kind of meloxicam benzene sulfonic acid tablets and its preparation method and application, the meloxicam benzene sulfonic acid tablets include stabilizer, the stabilizer is selected from one or more of anhydrous citric acid, polyethylene glycol, sorbitol, crosslinked povidone, sodium acetate trihydrate, anhydrous sodium acetate, nicotinic acid, nicotinamide, polyacrylic acid resin, ascorbic acid palmitate.The stability of meloxicam benzene sulfonic acid tablets prepared according to the prescription of the present application is significantly improved, while the preparation process is simple, and has good application prospect.

The utility model relates to the technical field of anhydrous sodium acetate production, and discloses a reaction tank for anhydrous sodium acetate production, which comprises a support, a reaction tank is fixedly mounted in the support, and a first feed port is fixedly mounted at the top of the reaction tank. Through operation of the servo motor, the rotating disc and the brake block rotate together, the brake block rotates to drive the material distributing plate through the ratchet wheel to conduct batch discharging, then the screw rod descends by rotating the rotary knob, at the moment, when the brake block drives the ratchet wheel to rotate, the screw rod abuts against the induction rod, and the brake block stops driving the ratchet wheel to rotate; compared with a traditional device, the device is driven by the servo motor, so that the six groups of material distributing plates start to feed materials in batches, the pressure burden in the reaction tank is prevented from being increased, the feeding interval of the material distributing plates is controlled through the screw rod, the feeding precision is improved, the reaction between acetic acid and dietary alkali is smoother, and the product quality is improved.

The present invention provides a practical method for preparing a chlorella culture medium, wherein anhydrous sodium acetate, soil leaching solution, jackfruit leaf extract, oxalis leaf extract, macronutrient water-soluble fertilizer and tracenutrient water-soluble fertilizer are mixed to prepare the chlorella culture medium. The chlorella culture medium of the present invention is rich in various nutrients and growth factors, can ensure the rapid growth requirements of chlorella, has a strong inhibitory effect on bacteria and parasites, can effectively reduce the contamination of miscellaneous bacteria and parasites during the chlorella culture process, and has obvious effects.

The invention discloses a water-soluble diamond grinding paste for a high-hardness material as well as a preparation method and application of the water-soluble diamond grinding paste. The water-soluble diamond grinding paste for the high-hardness material comprises the following components in parts by mass: 10-80 parts of stearic acid; 1 to 20 parts of vinyl ether; 1 to 10 parts of vaseline; 0.1 to 10 parts of wax; and 2-200 parts of artificial diamond micro powder. The preparation method of the water-soluble diamond grinding paste for the high-hardness material comprises the following steps: putting 10-80 parts of stearic acid, 1-20 parts of vinyl ether, 1-10 parts of vaseline, 0.1-10 parts of wax and 2-200 parts of artificial diamond micro powder into a heating device, and adding anhydrous sodium acetate and triethylamine as catalysts; the heating device is placed in an autoclave to be pressurized and heated, the heated abrasive paste is obtained, the heating temperature ranges from 100 DEG C to 150 DEG C, the pressure ranges from 1 MPa to 200 MPa, and the heating time ranges from 2 h to 4 h; and cooling the heated grinding paste to room temperature to obtain the water-soluble diamond grinding paste.

The application relates to the field of anhydrous sodium acetate drying technology, in particular to an anhydrous sodium acetate drying equipment, which comprises a drying machine body, a feeding port and a discharging port are arranged on the drying machine body respectively, a supporting frame is arranged on the outer side of the drying machine body and close to the feeding port, and a pretreatment shell is fixedly installed on the supporting frame; a feeding mechanism is connected to the top of the pretreatment shell, the feeding mechanism is used for containing anhydrous sodium acetate wet material; a batch processing mechanism is arranged in the pretreatment shell, the batch processing mechanism is used for stirring and crushing the wet material entering the inside of the pretreatment shell; a discharge hopper is communicated with the bottom of the pretreatment shell, and an intermittent discharging mechanism is connected to the discharge hopper, controlled batch processing is formed by cooperation of the pretreatment shell and the batch processing mechanism, the traditional bulk continuous feeding is converted into controlled batch processing, the caking phenomenon of the wet material caused by accumulation before entering the drying machine body is effectively avoided, and the consistency of the feeding is ensured.

The application belongs to the technical field of cellulose derivative preparation, and discloses a hydroxypropyl methyl cellulose acetate succinate and a preparation method and application thereof. The method comprises the following steps: mixing glacial acetic acid, a first part of acetone, acetic anhydride and anhydrous sodium acetate, then adding hydroxypropyl methyl cellulose and an oxidizing agent to perform a first-stage esterification reaction, dissolving succinic anhydride in a second part of acetone, then dropping and performing a second-stage esterification reaction, adding water to terminate the reaction after the reaction is completed, placing the terminated reaction material in water to suspend and disperse, and sequentially performing soaking, water replacement, centrifugal washing and drying. The obtained hydroxypropyl methyl cellulose acetate succinate has low free acid residue, the material is not easy to gather and agglomerate, and has good quality stability, and can be used for preparing enteric preparations.

This invention belongs to the field of catalytic materials technology, and discloses a NiCo nanosphere alloy catalyst material, its preparation method, and its application. The invention involves dissolving nickel nitrate, cobalt nitrate, and anhydrous sodium acetate in ethylene glycol and stirring vigorously until homogeneous. The homogeneous solution is then transferred to a polytetrafluoroethylene (PTFE) reactor and reacted at an ambient temperature of 25–350°C for 1–120 h. The reaction product is washed, centrifuged, and the resulting pale blue precipitate is dried. The dried pale blue precipitate is then reduced in a tube furnace to obtain a NiCo alloy catalyst material with a nanosphere structure. The synthesis process of this NiCo alloy catalyst material is simple and the conditions are mild. When used for the catalytic hydrogenolysis of lignin to high-value aromatic monomers, the obtained catalyst material exhibits high selectivity for aromatic monomers, and its catalytic performance is comparable to commercially available noble metal catalysts, representing a significant breakthrough in replacing noble metals with inexpensive transition metals.

The invention belongs to the technical field of sewage treatment, and discloses an adsorption-degradation function integrated recoverable catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a cobalt source, an iron source, sodium acrylate, anhydrous sodium acetate and a solvent, and performing solvothermal reaction to obtain cobalt ferrite; the preparation method comprises the following steps: mixing cobalt ferrite, ammonia water, tetrapropoxysilane, resorcinol, formaldehyde, ethanol and water, reacting, pyrolyzing, etching with alkali liquor, and pyrolyzing again to obtain the catalyst. Core-shell hollow mesoporous carbon sphere encapsulated cobalt ferrite nanoparticles are prepared and used for activating PMS to degrade LFX. Due to the remarkable adsorption capacity, LFX can be effectively enriched, and free radical and non-free radical oxidation jointly act on PMS activation to complete LFX degradation. The catalyst can be effectively recovered and reused through magnetic separation, and has the advantages of small dosage, wide pH application range and high stability.

This invention provides a method for removing impurities from an enoxylation reaction solution, comprising the following steps: (1) adding methanol and anhydrous sodium acetate solution to the enoxylation reaction solution, mixing and precipitating to obtain a solid-liquid suspension; (2) adding purified water to the solid-liquid suspension while stirring, then stopping the stirring and allowing it to stand, removing the supernatant, taking the wet solid, washing with methanol, and drying to obtain dried enoxylated heparin. This method reduces the amount of methanol used, optimizes the impurity removal effect of the enoxylated heparin process, reduces material transfer operations between equipment, optimizes the process flow, improves the yield and production efficiency of enoxylated heparin, and is convenient and safe to operate, suitable for large-scale production.

The invention belongs to the technical field of adsorbents, and discloses preparation of a magnetic fluorine functionalized three-dimensional covalent organic framework and application of the magnetic fluorine functionalized three-dimensional covalent organic framework in analysis of benzoylurea insecticides, and the preparation method of the magnetic fluorine functionalized three-dimensional covalent organic framework comprises the following steps: mixing an ammonia source, anhydrous sodium acetate, ferric chloride and ethylene glycol according to a ratio, and stirring uniformly; heating, violently stirring and premixing, and then heating and reacting for set time to obtain NH2-Fe3O4; the preparation method comprises the following steps: mixing and grinding tetra (4-aminophenyl) methane, 2, 3, 5, 6-tetrafluoro-p-dibenzaldehyde, NH2-Fe3O4, 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide and 1-carboxymethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide according to a ratio, introducing nitrogen into a reaction system, emptying air, sealing, and reacting at 20-40 DEG C for 10-30 hours, so as to obtain the tetra (4-aminophenyl) methane, 2, 3, 5, 6-tetrafluoro-p-dibenzaldehyde, NH2-Fe3O4, 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide and 1-carboxymethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide. And after the reaction is finished, extracting by using an organic solvent, and drying an extracting solution to obtain the NH2-Fe3O4-coated F-3D COF. The NH2-Fe3O4 (at) F-3D COF shows strong adsorption performance on the BUs through the interaction of fluorine-fluorine affinity and hydrogen bonds.

The invention discloses oily diamond grinding paste as well as a preparation method and application thereof, the preparation method comprises the following steps: putting 10-80 parts of stearic acid, 1-20 parts of vinyl ether, 1-10 parts of vaseline, 2-15 parts of glyceride, 0.1-8 parts of glycerol, 0.1-10 parts of wax and 2-200 parts of artificial diamond micro powder into a heating device, and adding anhydrous sodium acetate and triethylamine as catalysts; the heating device is placed in a high-pressure kettle to be pressurized and heated, argon is introduced into the high-pressure kettle at the same time, the temperature rise time for heating to 105 DEG C is 2-4 h, the pressure of the high-pressure kettle is 1-200 MPa, and heated abrasive paste is obtained; and cooling the heated grinding paste to room temperature to obtain the oily diamond grinding paste.

The application discloses a preparation method and an evaluation method of high-stability iron oxide / graphene nanocomposite, and relates to the technical field of nanomaterials. The expanded graphite is dissolved in DMF and left overnight, a multilayer graphene solution is prepared by adding water after ultrasonic treatment of the mixture in an ice bath environment for 2.5-3 hours; FeCl3.4H2O and anhydrous sodium acetate are weighed and added into the multilayer graphene solution, and the mixture is stirred intensively to obtain a reaction precursor solution; the reaction precursor solution is kept in a water bath, cooled to room temperature, and subjected to high-speed centrifugal separation to obtain a wet sample; the wet sample is washed by using anhydrous ethanol and pure water, and dried to obtain a red-brown powder. By loading Fe2O3 particles on graphene, the two-dimensional sheet structure, high thermal conductivity and high dispersibility of the graphene can effectively prevent the agglomeration of the nanoparticles, ensure the uniform distribution of the particles, improve the stability of the nanomaterials in an aqueous solution, improve the light absorption capacity of the nanomaterials, and make the materials more stable in the photothermal conversion.

The invention provides a method and equipment for efficiently preparing anhydrous sodium acetate, and relates to the technical field of organic chemical product preparation, and the method comprises the following steps: (1) inputting food-grade glacial acetic acid and ionic membrane liquid sodium hydroxide into a pH self-adaptive neutralization reactor according to a molar ratio of 1: (1.02-1.05), dynamically adjusting the flow of alkali liquor through a PID (Proportion Integration Differentiation) controller, and maintaining the pH value to be 7.2 + / -0.05 and the temperature to be 60 + / -0.5 DEG C; (2) removing impurities from the reaction liquid through a cyclone filter, wherein a conical flow baffle and five layers of 316L stainless steel sintered mesh filter elements are arranged in the filter; (3) inputting the filtrate into a multifunctional evaporation drying kettle through a heat preservation pipeline, and sequentially completing concentration, crystallization and dehydration drying in the multifunctional evaporation drying kettle, the concentration, crystallization and dehydration drying are completed in the same multifunctional evaporation drying kettle, solid-liquid separation is not needed, no mother liquor is generated in the production process, no centrifugal separation procedure is needed, the technological process is simplified to the maximum extent, and the production cost is reduced. The production efficiency is improved, the production cost is reduced, and the product quality is stable.

This invention provides a direct-inoculation lactic acid bacteria starter culture, its preparation method, and its application. The method includes: inoculating activated lactic acid bacteria strains into a nucleotide medium for expansion culture to obtain a high-density lactic acid bacteria inoculum; centrifuging the high-density lactic acid bacteria inoculum, mixing the bacterial cells with a freeze-drying protectant, and freeze-drying to obtain the direct-inoculation lactic acid bacteria starter culture; wherein the nucleotide medium comprises: 0.3–0.8 g / L nucleotides, 2–10 g / L beef extract powder, 25–35 g / L soybean peptone, 10–17 g / L sucrose, 1–6 g / L anhydrous sodium acetate, 2–8 g / L triammonium citrate, 1.0–1.6 g / L potassium dihydrogen phosphate, 0.1–0.8 g / L magnesium sulfate monohydrate, 0.023–0.029 g / L manganese sulfate, and 2–6 g / L Tween 80; the nucleotides include at least one selected from guanine, adenine, xanthine, or uracil. The method provided by this invention can improve the activity and stress resistance of lactic acid bacteria strains, and enhance their adaptability to harsh environments, thereby obtaining a direct-inoculation lactic acid bacteria starter with high density and freeze-drying survival rate.

The invention relates to the technical field of kits, in particular to an oral cavity swab nucleic acid protection liquid and an extraction kit.The oral cavity swab nucleic acid protection liquid is composed of, by weight, 3.5-4.5% of anhydrous sodium acetate, 5-10% of polyethylene glycol, 5-10% of ethylenediaminetetraacetic acid and 5-10% of Tris hydrochloric acid, and the specific content is as follows: the anhydrous sodium acetate is 3.5-4.5%; 6%-8% of ethylenediamine tetraacetic acid; 0.8%-1.2% of Tris hydrochloric acid; 0.8%-1.2% of polyethylene glycol; the nucleic acid extraction method based on the paramagnetic particle method extraction kit is simple and convenient to operate, does not contain toxic reagents such as phenol chloroform and the like, can extract a plurality of samples at one time, realizes rapid diagnosis, simplifies experimental operation steps to the greatest extent, and ensures the safety of experimenters; the kit can meet the requirements of simplicity and convenience in operation, high sample flux and good nucleic acid extraction quality.

The present invention provides a CNTs / Fe3O4 / FeS2 / MoS2 composite material and a preparation method thereof, which relates to the technical field of microwave absorption materials. The method comprises the following steps: adding ferric chloride hexahydrate into an ethylene glycol solution and stirring to make it evenly mixed, then adding carbon nanotubes, polyethylene glycol and anhydrous sodium acetate into the mixed solution and continuing magnetic stirring; transferring the obtained solution to an autoclave for solvothermal reaction; after the obtained solution is cooled to room temperature, centrifuging to collect the sample, washing the sample with deionized water and alcohol, centrifuging the washed sample to collect it, and carrying out vacuum drying in a vacuum drying oven to obtain the CNTs / Fe3O4 material; dissolving thioacetamide and sodium molybdate in deionized water and stirring evenly, dissolving the CNTs / Fe3O4 material into the above solution for neutralization and ultrasonic treatment to make the solution uniform; carrying out hydrothermal reaction on the solution at 200 °C; centrifuging and collecting the obtained solution, washing it with deionized water and ethanol, and then drying it in a vacuum drying oven to obtain the CNTs / Fe3O4 / FeS2 / MoS2 composite material.

The invention discloses a chemical reduction gold working solution without additionally adding KCN. The working solution does not contain potassium cyanide (KCN); the gold-potassium alloy is prepared from the following components in percentage by mass or volume: gold potassium cyanide; pure water; the complexing agent comprises 8% of anhydrous sodium acetate, 6% of sodium ethylene diamine tetracetate, 3% of sodium sulfate, 2% of glycine, 0.08% of formaldehyde, 0.0002% of lead acetate trihydrate and 80.918% of water; the stabilizer comprises 2% of ethylene diamine tetraacetic acid tetrasodium salt, 1% of potassium ferrocyanide and 97% of water; the reducing agent comprises 5% of glycine, 4% of phosphoric acid, 0.8% of formaldehyde and 90.2% of water; and a pH adjusting agent. The invention further discloses a chemical gold plating method. The working solution provided by the invention does not contain potassium cyanide (KCN), so that a non-toxic chemical plating solution is realized; and meanwhile, the consistency and high stripping degree of a gold-plated layer after gold plating can be ensured.

The invention discloses a nano-island confinement iron mononuclear site catalyst and a synthesis method and application thereof, and relates to the technical field of water pollution control and resource recovery, the catalyst takes spheroidal C-Fe0 as a nano-island confinement carrier, urea is introduced as a nitrogen source through a calcination process, and is coordinated with Fe atoms in C-Fe0 to form a FeN4 mononuclear site, and the nano-island confinement iron mononuclear site catalyst is prepared. And a space synergistic effect is formed with the nano island confinement carrier. The preparation method specifically comprises the following steps: dissolving anhydrous sodium acetate in a green tea extracting solution, adding an iron nitrate nonahydrate solution, magnetically stirring, and centrifuging, washing and freeze-drying after the reaction is completed to obtain an iron precursor; the preparation method comprises the following steps: mixing an iron precursor with urea, and roasting in an inert gas environment to obtain the nano island confinement iron mononuclear site catalyst marked as C-Fe0-coated FeN4. According to the catalyst, the co-activation capability of PAA and 2, 6-DCP on a C-Fe0-coated FeN4 interface can be enhanced, 2, 6-DCP is induced to be subjected to an efficient oxidative polymerization reaction, and synchronous emission reduction and carbon resource recovery of 2, 6-DCP are achieved.

The invention relates to a stable determination kit for a multi-parameter electrolyte analyzer. The stable determination kit comprises a solution A and a solution B, the solution A is prepared from the following components: 80 to 160 mmol / L of sodium chloride, 2 to 10 mmol / L of potassium chloride, 1 to 10 mmol / L of lithium acetate, 0.1 to 5 mmol / L of magnesium acetate, 0.1 to 4 mmol / L of anhydrous calcium chloride, 10 to 100 mmol / L of anhydrous sodium acetate, 50 to 100 mmol / L of buffer solution, 0.1 to 10 g / L of preservative, 0.1 to 10 g / L of stabilizer and 0.1 to 10 g / L of surfactant. The solution B is prepared from the following components: 10 to 100 mmol / L of sodium chloride, 2 to 10 mmol / L of potassium chloride, 1 to 10 mmol / L of lithium acetate, 0.1 to 5 mmol / L of magnesium acetate, 0.1 to 4 mmol / L of anhydrous calcium chloride, 10 to 100 mmol / L of anhydrous sodium acetate, 50 to 150 mmol / L of buffer solution, 0.1 to 10 g / L of preservative, 0.1 to 10 g / L of stabilizer and 0.1 to 10 g / L of surfactant. The content of K < + >, Na < + >, Cl <->, Ca < 2 + >, Li < + >, Mg < 2 + > and pH in a sample can be tested at the same time, the accuracy, repeatability and recovery rate are not affected when the sample is stored for 24 months at the temperature of 2-37 DEG C, and the raw materials are easy to obtain.

The invention discloses a composite material of ZnFe2O4 nano microspheres loaded on residual carbon of coal gasification fine ash and a preparation method thereof. In the composite material, the ZnFe2O4 nano microspheres are disorderly adhered to the surface of the residual carbon of coal gasification fine ash, and one end of the flaky structure of part of the residual carbon of coal gasification fine ash is inserted into the ZnFe2O4 nano microspheres. The preparation method of the composite material comprises the following steps: S1: Preparation of residual carbon of coal gasification fine ash; S2: Adding the residual carbon of coal gasification fine ash in S1 into ethylene glycol and carrying out ultrasonic treatment for dispersion; S3: Adding zinc salt and iron salt into the mixed solution in S2, stirring and mixing evenly, then continuing to add polyethylene glycol 4000 and anhydrous sodium acetate, and stirring and mixing evenly; S4: Placing the mixed solution in S3 into a reaction kettle for reaction, and after the reaction, washing and drying to obtain an ultra-thin wave-absorbing material. The wave-absorbing material prepared by the invention has excellent electromagnetic wave absorption performance, and realizes the resource recycling of solid waste in coal gasification technology.

The invention provides a fluorescent chemical sensor for detecting biological sulfhydryl compounds and a preparation method thereof, and the method comprises the following steps: mixing a compound L1 / L2, 4-aminophenylboronic acid, tetrakis (triphenylphosphine) palladium, an inorganic base, an organic solvent and a water mixture, carrying out freezing-vacuumizing-nitrogen filling-unfreezing operation, then carrying out heat treatment and carrying out a reaction, after the reaction is completed, separating a product to obtain a compound P1 / P2; dissolving the compound P1 / P2 and maleic anhydride in a solvent for reaction, and removing the solvent after the reaction is finished to obtain an intermediate; mixing the intermediate, acetic anhydride and anhydrous sodium acetate, heating for continuous reaction, and separating a product after the reaction is completed to obtain a target compound M1 / M2; the fluorescent chemical sensor prepared by the invention shows good biological sulfydryl sensing performance, can efficiently detect biological sulfydryl compounds, is reasonable in scheme, has the advantages of simplicity in operation, high sensitivity, convenience in preparation, on-site detection and the like, and provides a new choice for efficient detection of the biological sulfydryl compounds.

To provide a method for producing powdered brewed vinegar capable of improving shelf life without deteriorating taste of a food product, and by suppressing acid taste, and easy to pulverize the brewed vinegar.SOLUTION: A method for producing this powdered brewed vinegar comprises: Step A, concentrating brewed vinegar into a concentrated brewed vinegar with an acidity exceeding 85% by performing a distillation process, in which the acetic acid component is evaporated, cooled, and recovered, a predetermined number of times; Step B, spraying a predetermined amount of the concentrated brewed vinegar in mist form onto a powdered base material such as anhydrous sodium acetate and mixing; and Step C, after Step B, drying the mixed material while stirring, with the brewed vinegar adsorbed on the powdered base material, to produce a powder with a pH of 4.8 or less and an acidity of 30% or more.SELECTED DRAWING: None

The invention provides a composite scaffold material and a preparation method and application thereof, and relates to the technical field of composites.The preparation method comprises the steps that ferric chloride hexahydrate and anhydrous sodium acetate are added into ethylene glycol for a reaction, and Fe3O4 nanoparticles are obtained; potassium ferricyanide and a dispersion medium are added into a hydrochloric acid solution to be dissolved, then Fe3O4 nanoparticles are added for a reaction, and a Fe3O4 / PB heterojunction is obtained; the preparation method comprises the following steps: mixing and grinding a Fe3O4 / PB heterojunction and poly-L-lactic acid, and carrying out laser printing to form the PLLA-Fe3O4 / PB microwave antibacterial composite scaffold material. PLLA is taken as a carrier, the Fe3O4 / PB heterostructure scaffold material is loaded, the microwave absorption performance is enhanced through a magnetic-dielectric synergistic effect, under microwave irradiation, by virtue of a dual mechanism of interface polarization and dipole polarization, the composite scaffold material is prepared into the PLLA-Fe3O4 / PB microwave antibacterial composite scaffold material, and the composite scaffold material is prepared into the PLLA-Fe3O4 / PB microwave antibacterial composite scaffold material. Microwave thermal therapy and microwave power are synchronously realized, and the microwave thermal therapy and the microwave power synergistically show an efficient antibacterial effect on the osteomyelitis infected by the staphylococcus aureus.

The invention discloses magnetic nail-free glue and a preparation method thereof.The magnetic nail-free glue is prepared from, by weight, 30-40 parts of silane-terminated polyether resin, 10-20 parts of nano-calcium with the particle size ranging from 5000 meshes to 10000 meshes, 5-15 parts of plasticizer, 25-35 parts of modified magnetic material, 10-20 parts of polypropylene glycol 2000, 1-5 parts of coupling agent, 0.3-0.5 part of catalyst and 1-2 parts of dewatering agent, the modified magnetic material is subjected to a reaction through FeCl36H2O, anhydrous sodium acetate and 1, 6-hexamethylenediamine to obtain an NH2-Fe3O4 nano-material, and then the NH2-Fe3O4 nano-material is added to the modified magnetic material to obtain the magnetic nail-free glue. The magnetic-attraction nail-free glue is prepared through an amidation reaction between the magnetic-attraction nail-free glue and ferrocene carbonyl acid, the viscosity of the magnetic-attraction nail-free glue is 2000-3000 cP, the magnetic-attraction nail-free glue is a gray paste, the magnetic-attraction nail-free glue is good in stability, the modified magnetic material does not agglomerate and does not settle in the storage process, and after coating and curing, the modified magnetic material is kept stable and does not lose magnetism due to oxidation.

The invention provides a method for detecting hydroxylamine hydrochloride in azithromycin, and belongs to the technical field of pharmaceutical analysis. The detection method adopts ultraviolet detector type high performance liquid chromatography for detection, and specifically comprises the following steps: (1) preparation of a test solution: taking to-be-detected azithromycin and anhydrous sodium acetate, dissolving the azithromycin and anhydrous sodium acetate with an alcohol organic solvent, and then adding acetic acid and benzaldehyde for derivatization to obtain the test solution; and (2) injecting the test solution into a high performance liquid chromatograph for detection, and recording a chromatogram. According to the detection method disclosed by the invention, quantitative detection of hydroxylamine hydrochloride in azithromycin can be realized by adopting an ultraviolet detector type high performance liquid chromatograph, the responsivity is high, and the universality is good. Besides, the detection method is good in separation effect on hydroxylamine hydrochloride in azithromycin, good in detection specificity, high in sensitivity and low in detection cost, so that the detection method is very suitable for quantitative detection of hydroxylamine hydrochloride in azithromycin and has a good application prospect.

The invention provides a direct vat set starter for lactic acid bacteria as well as a preparation method and application of the direct vat set starter. The method comprises the following steps: inoculating an activated lactic acid bacteria strain into a nucleotide culture medium, and carrying out enlarged culture to obtain a high-density lactic acid bacteria agent; the method comprises the following steps: centrifuging a high-density lactic acid bacterium agent, mixing thalli with a freeze-drying protective agent, and freeze-drying to obtain a lactic acid bacterium direct vat set starter; wherein the nucleotide culture medium comprises the following components: 0.3 g / L to 0.8 g / L of nucleotide, 2 g / L to 10 g / L of beef extract powder, 25 g / L to 35 g / L of soy peptone, 10 g / L to 17 g / L of cane sugar, 1 g / L to 6 g / L of anhydrous sodium acetate, 2 g / L to 8 g / L of triammonium citrate, 1.0 g / L to 1.6 g / L of monopotassium phosphate, 0.1 g / L to 0.8 g / L of magnesium sulfate monohydrate, 0.023 g / L to 0.029 g / L of manganese sulfate and 2 g / L to 6 g / L of Tween 80; the nucleotide comprises at least one of guanine, adenine, xanthine or uracil. According to the method provided by the invention, the activity and stress resistance of the lactic acid bacteria strain can be improved, and the adaptive capacity of the lactic acid bacteria strain to a severe environment is improved, so that the lactic acid bacteria direct vat set starter with relatively high density and freeze-drying survival rate is obtained.

The cell stabilizer is prepared from the following components in concentration: 3 to 10 percent (w / v) of a cell separating agent, 3 to 8 mu M of a caspase inhibitor, 0.33 to 0.40 mM of mimic peptide, 3.35 to 7.25 mM of alpha-D-glucose, 0.50 to 1.50 mM of N-acetyl-L-cysteine, 2 to 15 mM of NaCl, 0.02 to 90 mu g / ml of a platelet inhibitor and 20 to 40 mM of anhydrous sodium acetate. According to the cell stabilizer provided by the invention, the preservation time of a whole blood sample after being in vitro can be prolonged, so that the detection duration of the collected sample of the detection kit can be prolonged, and the stability of an ATP detection value of the detection kit can be ensured.