349 results about "Trisodium citrate" patented technology

The invention provides a separation and purification method of urokinase, and relates to the technical field of separation and extraction. The separation and purification method comprises the following steps: S1, regulating the pH value of male urine to 8.5, standing, and taking supernate; s2, mixing the supernate with an adsorption material, and eluting with an eluent to obtain a urokinase crude product solution; the adsorption material is a core-shell silica gel polymer, Fe3O4atSiO2-NH2 is taken as a core, and polystyrene is taken as a shell; the eluent is a sodium citrate buffer solution with the concentration of 0.5 to 0.15 M, acetonitrile with the concentration of 1 to 5 weight percent and EDTA (Ethylene Diamine Tetraacetic Acid) with the concentration of 0.5 to 1.5 mM; and S3, carrying out anion exchange column chromatography on the urokinase crude product solution, eluting with an eluent, and precipitating to obtain the urokinase. The urokinase prepared by the method has the advantages of high polymer urokinase content, high recovery rate and high activity yield.

The invention discloses a zinc-bromine flow battery multifunctional electrolyte and a preparation method thereof, and belongs to the technical field of electrochemical energy storage, and the method comprises the following steps: dissolving an electrolyte in a solvent, and sequentially adding a supporting electrolyte, a positive electrode complexing agent and a positive electrode additive to obtain a positive electrode electrolyte; the positive electrode additive is zinc iodide; i <-> in zinc iodide and Br2 in a Br2 / Br <-> reaction system form mixed halide ions, so that the bromine resistance function is achieved, and the overall conductivity and comprehensive electrochemical performance of the electrolyte are improved; dissolving an electrolyte in a solvent, and sequentially adding a supporting electrolyte and a first negative electrode additive to obtain a negative electrode electrolyte; the first negative electrode additive comprises sodium acetate and sodium citrate; sodium acetate and sodium citrate are combined to form a wide-range buffer system, the pH value of the electrolyte can be dynamically adjusted and stabilized, the long-term stability of the battery is improved, the cycle life is prolonged, and the positive electrode electrolyte and the negative electrode electrolyte form the multifunctional electrolyte for the zinc-bromine flow battery; and the zinc deposition behavior is cooperatively regulated and controlled through sodium salt buffering and ion coordination.

The invention relates to the technical field of fluorescent hydrogel, in particular to high-strength and high-stability fluorescent hydrogel as well as a preparation method and application thereof, the fluorescent hydrogel is formed by physical crosslinking of a hydrogel matrix, a rare earth fluorescent complex and a stabilizer, the hydrogel matrix is of a double-network structure formed by physical crosslinking of polyvinyl alcohol and carboxymethyl cellulose; the rare earth fluorescent complex is formed by connecting rare earth metal ions and an organic antenna material through coordination; the stabilizer is trisodium citrate. Compared with other fluorescent hydrogel, the fluorescent hydrogel with high strength and high stability provided by the invention has the advantages that the phenomena of fluorescence decay and fluorescence quenching caused by metal ions and saturated salt solution are avoided, and the fluorescence is kept stable in a wide pH range. Because the fluorescence characteristic is not influenced by environmental corrosion factors, the information can be stably displayed for a long time, and the method can be used for information encryption and anti-counterfeiting in an extreme environment.

The invention discloses a preparation process of a rare earth precipitation resistant electrophoretic coating for an automobile body. The preparation process comprises the following steps: S1, preparing a stable solution; s2, preparing a rare earth chelating solution; adding lanthanum lactate into the stable solution for multiple times, and adding ammonium ceric sulfate for multiple times after the lanthanum lactate is completely dissolved; s3, preparing a resin base solution; s4, preparing mixed slurry; s5, adding a solvent and an auxiliary agent; a five-membered ring chelate with thermodynamic stability is formed by carboxyl, hydroxyl and rare earth elements in sodium citrate, rare earth ions can be tightly wrapped through strong coordination bonds, namely, empty orbits of the rare earth ions and lone pair electrons of a chelating agent form coordination bonds, so that the rare earth ions cannot be dissociated in a system, and the rare earth ions are prevented from being dissociated in the system. And a path of generating hydroxide precipitates by free rare earth ions is thoroughly blocked, so that rare earth elements are effectively ensured to be uniformly distributed in the electrophoretic paint, and the surface of a raw material treated by a subsequent electrophoresis process is more uniform.

The invention discloses a urease-producing microorganism induced calcium carbonate deposition solution for foundation reinforcement and a preparation method and application thereof, and belongs to the technical field of foundation reinforcement. The urease-producing microorganism induced calcium carbonate deposition solution comprises a bacterial solution, a cementing solution and a sodium citrate solution, the bacterial liquid comprises bacteria capable of generating urease and citrobacter freundii. Sodium citrate in the urease-producing microorganism induced calcium carbonate deposition solution can chelate free calcium ions in advance, the concentration of the free calcium ions is reduced, the risk of precipitation at an injection port in the single-phase injection process is eliminated, and the solution can smoothly permeate into a deep layer; citrobacter freundii produces acid through metabolism and utilizes citric acid radicals through metabolism to ensure gradual release of calcium ions, so that uniform deposition of calcium carbonate is triggered. Through the synergistic effect of sodium citrate chelated calcium ions and citrobacter freundii metabolism, the solution can be uniformly distributed in the soil sample, and the problem of uniformity of single-phase perfusion is successfully solved.

The application provides a kind of superfine copper powder and its preparation method and application, the preparation method of the above-mentioned superfine copper powder uses two-step liquid phase reduction method to prepare superfine copper powder, and improves process conditions, using dropwise feeding mode. Among them, the first step uses alkaline ascorbic acid solution to reduce copper chloride to cuprous chloride with narrow particle size distribution; the second step uses ferrous sulfate and sodium citrate as mixed reducing agent, and sodium citrate can also be used as a complexing agent, which helps to reduce the cuprous chloride to spherical, well-dispersed, uniform particle size distribution of superfine copper powder. At the same time, the raw materials used by the application are easy to obtain, the reaction process is mild, and organic solvents and toxic and hazardous reagents such as sodium borohydride and hydrazine hydrate are not needed, the preparation process has cost effectiveness, is friendly to the environment, and is suitable for industrial production.

The invention relates to the technical field of high-performance polyester, and discloses a modified preparation method of functionalized antibacterial polyester fibers, which comprises the following steps: S1, graphene is treated by oxygen-argon mixed plasma to obtain hydroxylated graphene; s2, after hydroxylated graphene is dispersed, cerium nitrate and sodium citrate are added, and cerium-based metallized graphene is obtained; s3, carrying out a reaction on the cerium-based metallized graphene and 3-(2-aminoethylamino) propyltrimethoxysilane, so as to obtain aminated graphene; s4, aminated graphene dicyandiamide, ammonium chloride tetraethoxysilane and hexadecyl trimethyl ammonium bromide are subjected to a reaction, and guanidyl-meso-porous silicon-metal composite graphene is obtained; s5, reacting the product with epsilon-polylysine and polycaprolactone to obtain a modified composite antibacterial agent; s6, treating the polyester fibers with a mixed solution of alkali and a surfactant; s7, the polyester fibers react with a solution containing an antibacterial agent, tetrabutyl titanate, an initiator and a dispersing agent, and a finished product is obtained.

The invention discloses concrete with anti-freezing performance and a preparation method thereof, and belongs to the technical field of concrete. The invention aims to solve the problems that the porosity of an interface transition area is high, hydration products are easy to degrade and the anti-freezing and anti-permeation performances are insufficient under the working conditions of high altitude, low air pressure, strong ultraviolet rays and salt-freezing synergy of the existing large-dosage fly ash concrete. The concrete is prepared from the following components in parts by weight: 100 parts of cement, 100 to 150 parts of coal ash, 280 to 320 parts of fine aggregate, 1000 to 1200 parts of modified basalt coarse aggregate, 1.5 to 3.5 parts of polycarboxylic acid water reducing agent, 0.2 to 0.6 part of PEG (Polyethylene Glycol) coated chitosan quaternary ammonium salt microspheres, 0.05 to 0.25 part of chitosan grafted nano cerium oxide composite particles, 1.0 to 3.0 parts of bacillus pseudofirmus microcapsule-polyvinylpyrrolidone mixture and 0.03 to 0.12 part of trisodium citrate. Through the synergistic effect of all the components, the interface structure of the concrete is effectively optimized, the ultraviolet aging resistance, the salt-freezing synergistic damage resistance and the chloride ion infiltration resistance are improved, the high-altitude severe service condition is adapted, and reliable material support is provided for high-altitude infrastructure construction.

The invention provides an electrolyte composition, an electrochemical in-situ etching method of non-metallic inclusions for heavy rail steel and application of the electrochemical in-situ etching method. The electrolyte composition comprises the following components in parts by weight: 1.6 to 2.3 parts of lithium chloride, 10 to 13.5 parts of acetylacetone, 45 to 84 parts of methanol and 2 to 43 parts of a reagent A, the reagent A is a mixed aqueous solution of ethylenediamine tetraacetic acid and sodium citrate. The lithium chloride, the acetylacetone, the methanol and the reagent A in specific parts are matched for use, the obtained electrolyte composition is used for in-situ electrochemical etching of the heavy rail steel, and three-dimensional in-situ etching of the non-metallic inclusions in the heavy rail steel can be successfully achieved. The in-situ information of the non-metallic inclusions in the hypereutectoid heavy rail steel is reserved, and the three-dimensional morphology of the non-metallic inclusions can be presented more comprehensively.

The invention discloses a nano-enzyme detection method for aflatoxin B1, and relates to the technical field of analysis and detection.The method comprises the following specific steps that nano-enzyme preparation and carrier selection are conducted, specifically, nano-gold is prepared through a sodium citrate reduction method to serve as the nano-enzyme, a chloroauric acid solution is added into a round-bottom flask and heated to be boiled, and a carrier is obtained; according to the method, the PNIPAM serves as an immobilization carrier of the nano-enzyme, reversible immobilization of the nano-enzyme is achieved, cyclic utilization of the nano-enzyme is promoted, the detection cost is reduced, after detection is completed, phase change of the PNIPAM can be achieved by changing environmental conditions, and therefore effective separation of nano-gold and the carrier is achieved; after the recovered nanogold is washed and subjected to re-functionalization treatment, the catalytic activity of the nanogold is maintained, and the nanogold can be used for detecting aflatoxin B1 again, so that the utilization rate of the nano-enzyme is increased, and the waste of resources is reduced.

The application provides a preparation method of a SERS substrate of a zirconium-based MOF-808 / AuNPs. The method comprises three steps: in the first step, an AuNPs solution is prepared by using deionized water, chloroauric acid and sodium citrate to perform an oil bath reaction to obtain the AuNPs solution; in the second step, MOF-808 is prepared by mixing zirconium chlorohydrate, 1,3,5-benzene tricarboxylic acid, N,N-dimethylformamide and formic acid, and then performing a hydrothermal reaction on the mixed solution, centrifuging and vacuum drying to obtain activated MOF-808-Zr powder; in the third step, the activated MOF-808-Zr powder is dissolved in anhydrous ethanol, and then fully stirred and mixed with AuNPs solutions of different amounts to form a zirconium-based MOF-808 / AuNPs solution; and in the fourth step, the zirconium-based MOF-808 / AuNPs solution is poured into sample boxes containing silicon substrates, and the silicon substrates are immersed, and after drying, a SERS substrate of the zirconium-based MOF-808 / AuNPs is obtained. The method has the advantages of simple preparation process, low cost, good uniformity of the prepared substrate, good signal repeatability, high sensitivity, good structural stability and the like.

The invention provides a breeding method suitable for breeding litopenaeus vannamei in saline-alkali soil, and relates to the technical field of aquaculture. According to the breeding method suitable for breeding the litopenaeus vannamei in the saline-alkali soil, the proportion of Ca < 2 + > to Mg < 2 + > to K < + > in a water body is optimized to be 2.8: 1: 0.3 by customizing a compound ion regulation and control solution, SO4 < 2-> / Cl <-> is controlled to be 0.14-0.8, and the pH is stabilized to be 8.2-8.8 in combination with a citric acid-sodium citrate buffer system; a slow-medium-fast segmented domestication strategy is adopted to adapt to different development stages of the fries; ethanol clostridium protein (CAP) is added into the feed to be combined with compound probiotics, so that immune metabolism regulation and control are enhanced. Experiments prove that according to the method, the survival rate of the litopenaeus vannamei seedlings reaches 86.3% + / -2.1%, the culture period is shortened by 12-15 days, the hepatopancreas SOD activity is improved by 42.6%, the vibrio inhibition rate reaches 78.5%, and the method is remarkably superior to the prior art. The method does not need large-scale pond transformation, adapts to different types of saline-alkali soil water bodies, realizes efficient green culture, and has important application value.

The invention discloses a scale dissolving agent for rapidly dissolving wet-process phosphoric acid scaling substances as well as a preparation method and application of the scale dissolving agent, and belongs to the technical field of descaling. The scale dissolving agent comprises the following components in percentage by weight: 20-30% of a scale remover, 3-5% of a penetrating agent, 0.3-0.8% of a penetrating aid, 0.5-1% of a surfactant, 0.3-0.5% of a synergist and the balance of water, wherein the descaling agent comprises trisodium citrate dehydrate, sodium ethylene diamine tetracetate and ammonium fluoride; the penetrating agent is prepared from dioctyl sodium sulfosuccinate and perfluoroalkyl ethyl acrylate; the permeation auxiliary agent comprises disodium hydrogen phosphate and sodium carbonate; and the synergist is 1-ethyl-3-methylimidazolium acetate. The scale dissolving agent is specially used for dissolving wet-process phosphoric acid scaling substances and has the advantages of being high in scale dissolving speed, mild in reaction condition, low in formula cost and the like, the pH value of the scale dissolving agent is neutral and slightly alkalescent, and corrosion to production equipment is effectively avoided.

The invention discloses bacteriostatic gel for gynecology and a preparation method thereof, and relates to the technical field of bacteriostatic gel. The antibacterial gel is prepared from a gel matrix, a plant extracting solution, antibacterial peptide, a humectant, astaxanthin microcapsules and a specific buffer solution. The buffer solution contains sodium citrate, hyaluronic acid and citric acid, and intelligent regulation and control of the drug release behavior of the astaxanthin microcapsule are realized by utilizing the synergistic effect of a hyaluronic acid and citric acid buffer system and preferably adopting hyaluronic acid compounded or modified with different molecular weights. The gel can maintain stable drug release in a normal vagina and pathological fluctuation pH environment, and trigger accelerated release in a high active oxygen inflammation environment, so that the problems that the release behavior is greatly influenced by environmental fluctuation and cannot adapt to different disease stages in the prior art are effectively solved, accurate and personalized drug delivery is realized, and the drug delivery efficiency is improved. The antibacterial agent has the advantages of good antibacterial effect and high environmental adaptability.

A pharmaceutical composition containing high concentrations of opiranserin is disclosed. More specifically, the pharmaceutical composition contains opiranserin or a pharmaceutically acceptable salt thereof, a carrier selected from sodium benzoate, trisodium citrate, sodium salicylate, and mixtures thereof, and an injectable solvent.

The invention discloses a preparation method of a luminescent material for an epoxy negative photoresist, and belongs to the technical field of photoresists. The preparation method comprises the following steps: mixing Yb / Er / Tm doped rare earth chloride with oleic acid, 1-octadecene and oleylamine, dehydrating to form a homogeneous complex, injecting NaOH and NH4F solutions, and synthesizing an up-conversion nano core dispersion liquid at high temperature; heating the gold nanoparticles, adding HAuCl4, sodium citrate and PEI, and performing in-situ reduction to form a gold nanoparticle modification layer; successively adding GPTMS, APTES, PTMS, deionized water and ammonia water, and carrying out a hydrothermal reaction to prepare a functionalized siloxane shell layer; adding dopamine hydrochloride, and performing oxidative polymerization in a Tris buffer solution to form a polydopamine layer; adding thiolated polyethylene glycol to passivate, and centrifugally drying to obtain a nano luminescent material; and adding bisphenol A epoxy resin and other photoresist systems, and carrying out high-speed shearing and ultrasonic dispersion to obtain the uniform luminous composition. According to the method, plasmon enhancement and surface collaborative optimization are realized, the luminous intensity, heat and moisture resistance, resolution and adhesive force are improved, and the method is suitable for a high-performance photoetching process.

The invention relates to the technical field of electrochemical water treatment, in particular to a preparation method of a self-supporting antimony-doped tin dioxide nanoflower electrode, which comprises the following steps: dissolving trisodium citrate dehydrate and antimony trichloride in absolute ethyl alcohol; then adding water and stannous chloride dehydrate to form a precursor solution; heating the precursor solution, and naturally cooling; after cooling, carrying out solid-liquid separation on the bottom mud, and then cleaning and drying to obtain antimony-doped tin dioxide powder; taking antimony-doped tin dioxide powder, a pore-forming agent and a binder, grinding the materials until the materials are uniformly mixed, and transferring the materials into a tabletting mold for pressure casting to obtain a blank; and calcining the green body to obtain the product. Nano-flower-shaped antimony-doped tin dioxide powder is prepared, in the die casting and sintering process, due to the fact that nano-flower petals of the nano-flower-shaped antimony-doped tin dioxide powder are mutually staggered, a connection mode similar to a mortise and tenon joint mode is formed, and compared with nanospheres, the binding force between the powder is enhanced; and the mechanical strength, the electrochemical active area and the catalytic activity of the electrode are improved.

The invention discloses an anti-biofilm nano composite material added with resveratrol and a preparation method of the anti-biofilm nano composite material. According to the method, ferric trichloride hexahydrate, trisodium citrate, sodium acetate, polyetherimide, resveratrol and hyaluronic acid are used as raw materials, modified magnetic Fe3O4 nanoparticles with positive charges are prepared through a hydrothermal method, carbon dots derived from a resveratrol and hyaluronic acid mixture are introduced, and the magnetic Fe3O4 nanoparticles with positive charges are prepared. The anti-biofilm nano composite material added with the resveratrol is prepared. The nano composite material disclosed by the invention can be attached to a biological membrane, so that the loss is reduced in a transfer process, the effective utilization rate of a medicine is remarkably improved, and excellent magnetic property, antibacterial property and biological membrane resistance are shown.

The invention discloses a preparation method of silver-loaded nano-cluster-adriamycin composite hydrogel. The method comprises the following steps: preparing a silver nano-cluster from an AgNO3 solution and a gallic acid solution; preparing a prepolymer from chitosan, hyaluronic acid, an acetic acid solution and methacrylic anhydride; mixing silver nanoclusters, a doxorubicin hydrochloride solution and the prepolymer, and adding a photoinitiator to obtain preliminarily formed hydrogel; and immersing the primarily formed hydrogel into a sodium citrate solution to obtain the silver-loaded nano-cluster-adriamycin composite hydrogel. The composite hydrogel prepared by the invention has a pH-responsive drug release characteristic, the drug release is accelerated in an acidic environment, and the drug release is slow in a neutral environment; the antibacterial agent has an inhibiting effect on bacteria such as escherichia coli and staphylococcus aureus, and shows good antibacterial performance; the toxicity to cancer cells is obviously higher than that of normal cells, and certain tumor targeting is achieved; and the polymer has good mechanical strength and good swelling performance in different pH environments, and has a wide application prospect.

The invention discloses a method for removing calcite yellow skin, which comprises the following steps of: adopting sodium citrate (or trisodium citrate), disodium 1-hydroxyethylidene-1, 1-diphosphate and ethylenediamine tetraacetic acid (EDTA) as reaction solutions, adding NaOH to adjust the pH value of the reaction solutions to be neutral, decoloring calcite under the condition of constant-temperature stirring, filtering, washing and drying to obtain the calcite yellow skin. The calcite with the yellow skin removed is obtained. The brand-new method for removing the yellow skin of the calcite is provided, the yellow skin of the colored calcite can be removed, main components of the calcite are not affected, and the method has the advantages of being obvious in color fading effect and very small in quality loss.

The invention provides a preparation method of a water-responsive shrinkage collagen membrane. The preparation method comprises the following steps: providing a cyanidin-coated gallium-indium liquid metal and a collagen solution; mixing the cyanidin-coated gallium-indium liquid metal with a collagen solution, and carrying out vacuum drying to obtain slices; and salting out the slices by using a sodium citrate solution, and stretching to obtain the water-responsive shrinkage collagen membrane. The collagen membrane prepared by the method disclosed by the invention has excellent water response shrinkage performance, can be quickly shrunk under the stimulation of water, and also has excellent mechanical properties, electrical conductivity and oxidation resistance.

The invention belongs to the technical field of skin care products, and particularly relates to a multi-effect skin care mask containing loropetalum chinense extract and a preparation method of the multi-effect skin care mask. The mask liquid is prepared from, by mass, 2%-5% of loropetalum chinense extract, 5% of glycerinum, 0.1%-1% of sodium hyaluronate, 0.1%-1% of phenoxyethanol, 0.01%-0.05% of EDTA disodium, 0.05%-0.5% of citric acid / sodium citrate and the balance deionized water, and the multiple-effect skin care mask is excellent in ABTS free radical scavenging rate and tyrosinase inhibition rate, has the multiple effects of moisturizing, resisting oxidation and whitening and can be used for skin care. And a new thought is provided for development and utilization of loropetalum chinense.

The invention provides a full-automatic accelerated solvent extraction method for extracting antibiotics in soil, and belongs to the technical field of chemical detection. The extraction method provided by the invention comprises the following steps: mixing a soil sample with a mixed antibiotic internal standard solution, a purifying agent and methanol to obtain a to-be-extracted soil sample; the soil sample to be extracted is extracted in an accelerated solvent extraction evaporator ExtrevaASE, and a liquid to be detected is obtained; the extraction solvent is a mixed solution of a citric acid-trisodium citrate buffer solution and acetonitrile; the pH value of the citric acid-trisodium citrate buffer solution is 3 to 4. According to the method, an accelerated solvent extraction evaporator ExtrevaASE is adopted for extraction, so that the extraction process is fully automatic, manpower resources are saved, meanwhile, the extraction pressure is low (200 psi), and a mixed solution of a citric acid-trisodium citrate buffer solution and acetonitrile is adopted as an extraction solvent, so that the extraction effect is improved.

The invention discloses a salmonella typhimurium aptamer lateral flow chromatography test strip based on the photothermal effect of a ferroferric oxide and colloidal gold composite nanomaterial, a preparation method and application, and belongs to the technical field of lateral flow chromatography test strips. The preparation of the probe comprises the step of preparing a Fe3O4 (at) Au composite nano material; the preparation method comprises the following steps: under the protection of nitrogen, dissolving FeCl3. 6H2O and FeCl2. 4H2O in deionized water, adding ammonia water, stirring at room temperature, adding trisodium citrate, collecting by using a magnet, then adding into a boiling HAuCl4 solution, keeping boiling until the color of the solution becomes reddish brown, continuing heating, cooling, and collecting by using a magnet; the test strip provided by the invention can realize quantitative detection of salmonella typhimurium.

The invention relates to a water-based asphalt cleaning agent and a preparation method thereof, and belongs to the technical field of environment-friendly cleaning agents. The cleaning agent is prepared from the following components in percentage by mass: 3.5 to 6.5 percent of a D-limonene oxidized derivative, 0.8 to 1.5 percent of a C4-C6 perfluoroalkyl acrylate monomer, 0.3 to 0.7 percent of a betaine type quaternization reagent, 4 to 8 percent of alkyl glycoside, 2 to 4 percent of polyglycerol fatty acid ester, 1 to 2 percent of trisodium citrate, 0.3 to 0.8 percent of polyepoxysuccinic acid, 0.02 to 0.1 percent of a photoinitiator, 0.2 to 0.6 percent of a thickening agent and the balance of deionized water. According to the method, the terpene-fluorocarbon hybrid ampholytic surfactant is generated in situ through UV illumination of a D-limonene oxidation derivative and a C4-C6 perfluoroalkyl acrylate monomer at 55-60 DEG C, and a thermodynamically stable micro-emulsion structure is formed through programmed cooling and self-assembly, so that the rapid removal capability on high-viscosity asphalt is remarkably improved.

The invention relates to a preserving fluid for stabilizing viruses at normal temperature and high temperature as well as a preparation method and application of the preserving fluid. The preserving fluid is an aqueous solution containing the following components in concentration: 2mM-15mM of ethylenediamine tetraacetic acid tetrasodium salt, 5mM-20mM of sodium citrate, 0.1 wt%-10wt% of tween-20, 10wt%-30wt% of a structure stabilizer, 0.5 wt%-10wt% of an amide solution, 0.5 wt%-10wt% of a hemolysis inhibitor, 0.05 wt%-10wt% of a reducing agent and 0.1 mM-2mM of 3-morpholine propanesulfonic acid. According to the preservation solution, the formula is optimized, and particularly, the amide solution and the reducing agent component are matched with MOPS for use, so that the activity of viruses in a sample under normal-temperature and high-temperature conditions can be greatly maintained, and the stability of nucleic acid is effectively improved.

The invention discloses a private care wet tissue containing a bacteriostatic composition, the private care wet tissue comprises a composite non-woven fabric base material and an impregnation liquid, the impregnation liquid comprises the bacteriostatic composition, a soothing anti-inflammatory agent, a moisturizing repairing agent, an odor removal regulator, a cosolvent and a stabilizer; the preparation method comprises the following steps: adding purified water, a citric acid-sodium citrate buffer agent and EDTA (Ethylene Diamine Tetraacetic Acid) disodium into a vacuum stirring tank, then adding glycerol, micromolecular sodium hyaluronate and ceramide 3, and then adding L-lactic acid and a lactobacillus acidophilus fermentation product; sequentially adding nisin, cranberry extract, polyhexamethylene biguanide hydrochloride and beta-cyclodextrin inclusion tea tree essential oil, and finally adding dipotassium glycyrrhizinate, allantoin and citrus extract. Different from the prior art that private care wet tissues only have a single antibacterial function and neglect flora balance, peculiar smell is covered by depending on essence, the base material and the steeping liquor are designed at the same time, and the functions of bacteriostasis and antibiosis, gentle private care, odor removal and itching relieving, inflammation prevention and swelling prevention, flora balance maintenance and the like are achieved.

The application provides a fast-hardening early-strength high-pressure and freeze-resistant cement material and a preparation method thereof, belongs to the technical field of cement materials, and the cement material comprises silicate cement clinker, natural anhydrous gypsum, calcined kaolin, calcined quartz powder, a silicon-aluminum-titanium composite mineralized early-strength freeze-resistant agent, a crystal bridge-pore dual functional agent and the like. The silicon-aluminum-titanium composite mineralized early-strength freeze-resistant agent is prepared by sintering, quenching and heat reaction of bauxite, silica fume, titanium dioxide, anhydrous calcium chloride and trisodium citrate, and surface modification by KH-550. The crystal bridge-pore dual functional agent comprises a calcium silicate hydrate crystal bridge agent and a polymer-SiO2 composite elastic pore forming agent. The polymer-SiO2 composite elastic pore forming agent is prepared by shearing emulsification of an oil phase prepared from styrene, butyl acrylate, divinylbenzene and polyglyceryl-10 diisostearate and an aqueous phase prepared from deionized water, sodium dodecyl sulfate and polyethylene glycol allyl methyl ether, ammonium persulfate reaction and tetraethyl orthosilicate reaction.

The reagent for detecting MHC-II expression of tumor cells in gastric cancer tissue comprises the following components in parts by mass: 10-30 parts of paraffin section preparation liquid, 2-10 parts of dewaxing liquid, 2-10 parts of sodium citrate antigen repair liquid, and 20-40 parts of immunohistochemical staining liquid; the dewaxing liquid comprises dimethylbenzene, and at least one of flavonol aminobenzoate derivative and sinapamide benzyl trimethylammonium benzoate salt; the flavonol aminobenzoate derivative has a nitrogen-containing group and a benzene ring, and the sinapamide benzyl trimethylammonium benzoate salt has a long-chain unsaturated alkane and a nitrogen-containing group. The reagent for detecting MHC-II expression of tumor cells in gastric cancer tissue can obtain high-quality immunohistochemical staining sections, thereby improving the sensitivity and specificity of MHC-II expression detection.

This invention discloses a photoelectrocatalyst and its preparation method, wherein the photoelectrocatalyst comprises Zn 2+ Ce 4+ Au; Zn 2+ Including ammonium acetate, zinc nitrate, and hexamethylenetetramine; Ce 4+ Including cerium nitrate, ammonium chloride, and potassium chloride; Au includes PVP, sodium citrate, potassium bromide, and chloroauric acid; Zn 2+ Ce 4+ The molar ratio of Au to Zn is... 2+ Ce 4+ Au = 1:0.5 ~ 1:2.5 * 10 ‑7 ~7.5*10 ‑7 This method uses electrodeposition to prepare ZnO as a substrate. Its vertically aligned one-dimensional (1D) nanostructures exhibit quantum size-dependent effects, effectively shortening the carrier diffusion distance. CeO2 coats the ZnO, forming a stable, acid- and alkali-resistant substrate material. CeO2 traps electrons from Ce... 4+ Restored to Ce 3+ This forms oxygen voids and Ce 3+ / Ce 4+ Electron pairs produce high catalytic activity.