58 results about "TRISODIUM CITRATE DIHYDRATE" patented technology

The invention relates to a preparation method of tin dioxide nanometer material. The specific steps of the method are as follows: using stannous sulfate (SnSO4) and trisodium citrate dihydrate (Na3C6H5O7 2H2O) as raw materials, the amount of the two is used as a measurement basis according to a certain molar ratio, that is, SnSO4:Na3C6H5O7 2H2O=2 :5~4, weigh it and add it to a certain amount of mixed solution of absolute ethanol and deionized water with a volume ratio of (1:9~9), stir it quickly for 1~2 hours and then put it into the autoclave React at 120-200°C for 2-48 hours, wash with deionized water and ethanol several times after cooling, and obtain tin dioxide nanomaterials after drying. The invention has simple process, good repeatability and can be produced in batches. The particle size of the obtained tin dioxide nanosphere is about 50nm, and the monodispersity is good.

Belonging to the technical field of boar semen dilution, the invention relates to a boar antiviral long-acting semen diluent formula and a preparation method. The boar semen diluent comprises: alpha-D-glucopyranose powder, fructose, trisodium citrate dihydrate, ethylenediamine tetraacetic acid disodium, sodium bicarbonate, polyvinyl alcohol, trishydroxymethylaminomethane, inositol, vitamin C, arginine, a radix isatidis injection, a 5% ceftiofur sodium injection, and a 5% Ribavirin injection. The preparation method includes: dissolving all the components in distilled water, mixing the components evenly, and conducting sterilization to obtain the boar semen diluents. The formula involves rich nutrients, antibacterial Chinese and western medicine components and antibacterial components, thus ensuring normal sperm metabolism. After certain period of time at the lower limit of storage temperature, the effects of nutrition and sperm shock prevention can be realized, and the invasion of external bacterial viruses in an artificial insemination process can be avoided.

The invention discloses a preparation method of a nano 1T phase molybdenum disulfide / nickel disulfide composite nano material, belonging to the field of preparation of inorganic material transition metal chalcogenide. The preparation method adopts a two-step method, and comprises the following steps of: firstly, synthesizing a molybdate- radical- intercalated nano nickel hydroxide nanosheets froma plurality of substances of nickel nitrate, nickel chloride, ammonium molybdate hydrate, sodium molybdate, hexamethylene tetramine, trisodium citrate dihydrate, sodium dodecyl benzene sulfonate and sodium dodecyl sulfate as raw materials; and then carrying out hydrothermal synthesis by taking the nanosheets as templates and taking one or more of thiourea, thioacetamide or L-cysteine as sulfur sources to obtain a high-purity nano 1T-phase molybdenum disulfide / nickel disulfide composite nano material. The preparation method has simple process, mild conditions, high production efficiency and safe preparation process. By adjusting the dosage of the sulfur sources, the proportion of 1T phase molybdenum disulfide can be adjusted to obtain high purity 1T phase molybdenum disulfide.

The present invention provides a method for reducing metal ions (for example, silver ions) and stably dispersing metal nanoparticles by nanosilicate platelets. An organic dispersant, nanosilicate platelets and a metal ionic solution are mixed to perform a reductive reaction, wherein the organic dispersant is tri-sodium citrate dihydrate (SCD), chitosan or polyvinyl pyrrolidone (PVP), to produce a mixture of stably dispersed metal nanoparticles.

The invention discloses a magnetic nano functional material for extracting uranium from seawater, and a preparation method thereof. The preparation method includes the following steps: step 1, reacting ferric chloride hexahydrate with trisodium citrate dihydrate to obtain Fe3O4 particles; step 2, preparing Fe3O4@SiO2 particles through a compound reaction; step 3, dispersing Fe3O4@SiO2 in a mixed solution of ethanol and ammonium hydroxide, adding titanium isopropoxide, and obtaining Fe3O4@SiO2@TiO2 particles after reaction; step 4, dispersing Fe3O4@SiO2@TiO2 in an NaOH solution, and performingcalcination after reaction to obtain Fe3O4@s-TiO2 particles with developed surfaces; step 5, dispersing Fe3O4@s-TiO2 in acetic acid, adding a crosslinking agent, and carrying out an oil bath reactionto obtain cyanated Fe3O4@s-TiO2-CN particles; step 6, dispersing Fe3O4@s-TiO2-CN in a mixed solution of methanol and water, adding hydroxylamine hydrochloride, adjusting the pH of the solution to 7, and carrying out an oil bath reaction to obtain amidoximated Fe3O4@s-TiO2-AO particles. The Fe3O4@s-TiO2-AO material prepared by the preparation method has a developed surface, good magnetic properties, high stability, durability and bio-resistance and excellent adsorption selectivity for the uranium, and can be used for eliminating the uranium in uranium-containing water bodies and extracting theuranium from the seawater.

The invention discloses a preparation method and application of a ratiometric fluorescent probe for detecting copper ions. The method specifically comprises the following steps: firstly, preparing water-soluble CQDs from ethylenediamine and citric acid by virtue of a one-step hydrothermal method, and taking the water-soluble CQDs as reference fluorophores; then, through a reflux method, synthesizing GSH@CdTe QDs adopted as detection fluorophores of the ratiometric fluorescent probe, with the molar ratio of cadmium chloride hydrate, sodium tellurite, glutathione, trisodium citrate dihydrate tosodium borohydride in the reaction being controlled to be 1:0.06:1.02:2.13:8.28; finally, directly mixing the CQDs and the GSH@CdTe QDs to prepare the CQDs / GSH@CdTe QDs ratiometric fluorescent probe.Under the optimal condition, the prepared ratiometric fluorescent probe is used for quantitatively detecting copper ions based on a fluorescence quenching method. The detection limit of the ratiometric fluorescent probe to copper ions is as low as 0.35 nM, and the ratiometric fluorescent probe has great application potential in copper ion detection and analysis.

The invention relates to a preparation method of flaky Cu9Fe9S16 nanoflowers. The preparation method includes dispersing a ferric salt and a manganese salt into a solvent with stirring, adding trisodium citrate dihydrate with stirring, adding sodium acetate with mixing uniformly, performing solvothermal reaction for 6-8 hours at 180-240 DEG C prior to centrifuging and washing so as to obtain Fe2MnO4 nanocrystalline; dispersing the Fe2MnO4 nanocrystalline into water, adding a (NH4)2S solution, conducting ultrasonic dispersion and centrifugal washing, and dispersing a product into water so as to obtain dispersion liquid; adding a copper salt solution into the dispersion liquid, and conducting ultrasonic dispersion and centrifugal washing so as to obtain the flaky Cu9Fe9S16 nanoflowers. The preparation method has the advantages of simplicity, safety, environment friendliness, low cost and easiness in operation. The flaky Cu9Fe9S16 nanoflowers are capable of effectively converting near-infrared light into heat and have a nuclear magnetic imaging effect, thereby being quite promising in application prospect for photothermal therapy and diagnosis of cancers.

The invention provides a cold-water instant pig seminal fluid dilution powder formula, a manufacturing process and an application method, and is characterized in that each dosage of the formula comprises the following components: 36.0-40.0 g of glucose, 0.8-2.0 g of sodium bicarbonate, 6.0-8.0 g of trisodium citrate dihydrate, 1.0-3.0 g of potassium chloride, 1.0-3.0 g of citric acid monohydrate, 1.0-3.0 g of disodium ethylenediamine tetraacetic acid, 0.2-1.0 g of penicillin of 800,000 units, and 1.0-3.0 g of Tris (tris(hydroxymethyl)metyl aminomethane). The formula has easily-available materials, simple preparation, easy transport and storage, convenient usage, low cost, and long preservation time for seminal fluid; during application, only a certain amount of secondary distilled water is added, and dissolution is realized with cold water; the formula is suitable for dilution of pig seminal fluid which is preserved at a constant temperature of 17 DEG C, can reduce seminal fluid production cost and increase economic benefits.

The invention relates to a high-density enterococcus faecalis fermentation culture medium and a fermentation process thereof. The fermentation culture medium is prepared from 20-30 g / L of glycerol, 10-15 g / L of soybean meal, 1-3 g / L of ammonium sulfate, 2-3 g / L of potassium hydrogen phosphate, 3-8 g / L of sodium acetate trihydrate, 2-4 g / L of trisodium citrate dihydrate, 0.3-0.8g / L of magnesium sulfate heptahydrate and 0.1-0.3 g / L of manganese sulfate monohydrate. The fermentation process comprises the steps that high dissolved oxygen (25%) is adopted and combined with glycerin to serve as a fermentation carbon source, the pH value of the constant sodium carbonate fermentation liquid is 5.5, the glycerol concentration is controlled to 10 g / L by adding a supplementary material in the fermentation process in a flowing mode, culture is performed for 16 hours, and then the fermentation is completed when OD (600 nm) is greater than 35, wherein the viable count of the enterococcus faecalis contained in the fermentation liquid can be up to 8*1010 CFU / mL or above. In the fermentation mode that the high dissolved oxygen is combined with the glycerin to serve as the carbon source, the lactic acid concentration in the fermentation liquid is reduced, the enterococcus faecalis contained in the fermentation liquid can be up to 8*1010 CFU / mL or above, the biomass separation cost is reduced, a production cycle is shortened, the production cost is reduced, and the production efficiency is improved.

The invention discloses a preparation method of strontium titanate nano powder. The method comprises the following steps: by using strontium carbonate, strontium nitrate, strontium oxide or strontium chloride as a strontium source, anatase titanium dioxide as a titanium source and NaCl-KCl two-element eutectic salt as a basic molten salt, adding a third-element molten salt sodium nitrate, sodium sulfate, trisodium citrate dihydrate or sodium hydroxide, introducing anionic functional group as a guide agent, and carrying out a molten salt process to obtain the strontium titanate nano powder. The variety of the third-element molten salt can be changed in the preparation process to obtain the nano powder with different shapes. The preparation method obviously lowers the reaction temperature, is simple in synthesis technique and required production equipment, and can easily implement industrial production.

The invention belongs to the field of swine reproduction, and relates to boar seminal fluid long-acting diluting powder and an application thereof. The boar seminal fluid long-acting diluting powder is prepared from, by weight, formula 1, which comprises 4-6 g of glucose, 5-7 g of trisodium citrate dihydrate, 2-3 g of citric acid monohydrate, 7-8 g of edetic acid, 5-6 g of sodium bicarbonate, 2-3 g of potassium chloride, 6-7 g of tris(hydroxymethyl) aminomethane, 0.1-0.3 g of cysteine, 2-3 g of trehalose, 0.3-0.5 g of antibiotic enrofloxacin and 0.05-0.07 g of polymyxin B standard solution; formula 2 (optimized), which comprises 5.06 g of glucose, 6.12 g of trisodium citrate dehydrate, 2.3 g of citric acid monohydrate, 7.38 g of edetic acid, 5.54 g of sodium bicarbonate, 2.37 g of potassium chloride, 6.85 g of tris(hydroxymethyl) aminomethane, 0.21 g of cysteine, 2.11 g of trehalose, 0.42 g of antibiotic enrofloxacin and 0.06 g of polymyxin B standard solution.

The invention relates to a trimethylglyine compound nanoemulsion used for nourishing and moisturizing skin and a preparation method thereof. The nanoemulsion is prepared from the following raw materials in parts by weight: 10-17 parts of isopropyl myristate, 20-25 parts of Caprylocaproyl Macrogolglycerides, 6-16 parts of polyglyceryl fatty acid ester, 33-38 parts of triple distilled water, 0.1-1.0part of citric acid, 5.5-12 parts of Trisodium citrate dihydrate, 13-19 parts of trimethylglyine lactone, 13-19 parts of hydroxyethyl carbomite, 36-46 parts of Vitamin E and 10-16 parts of azone. Theinvention has the innovations that the newest international drug targeting vector transfer system is improved and optimized so as to enable the nanoemulsion to have dual effects of nourishing and moisturizing skin; the nanoemulsion can be made up and produced only at normal temperature, and the complex processes of respectively dissolving, heating, then mixing and emulsifying the oil phase and the water phase are not needed; the process is scientific, the operation is simple, special equipment is not needed, the preparation period is short (about 30 min), the production efficiency is high, and the industrialization is easy to realize; moreover, the nanoemulsion has stable quality, high comfort and high safety, and the effect ingredients are not easy to break; compared with the like products, the nanoemulsion has better effect, saves more energy, energy resources, materials, time and cost, reduces environmental pollution and the like.

The invention discloses a contact lens care solution, which comprises the following components: 100-200 parts of trisodium citrate dihydrate, 30-80 parts of sodium chloride, 50-100 parts of boric acid, 60-120 parts of sorbitol, 30-80 parts of aminomethyl propanol, 30-100 parts of edetate disodium, 50-130 parts of a wetting agent, 50-150 parts of a wetting matrix, 15-35 parts of vitamin B6, 30-50 parts of sodium carboxymethylcellulose, 0.1-0.3 part of polyquaternary ammonium salt-1, 0.01-0.03 part of myristamidopropyl dimethylamine, 0.01-0.03 part of polyhexamethylene biguanide and 0.01-0.03 part of naphazoline hydrochloride, wherein the wetting agent is any several kinds of taurine, panthenol and potassium L-aspartate; and the wetting matrix is a poly(oxyethylene) / poly(oxybutylene) copolymer and a polyoxyethylene / polyoxypropylene copolymer. The contact lens care solution has a good wetting effect; meanwhile, lipid and protein deposits on a contact lens can be effectively removed; and harmful microorganisms can be effectively killed.

The invention relates to a preparation method of a flower-like Au / Bi2O2CO3 / Bi2O3 photocatalyst, and belongs to the field of photocatalytic materials. The method comprises the following steps: (1) dissolving bismuth nitrate, trisodium citrate dihydrate, urea and PVP into ultrapure water, then carrying out hydrothermal reaction on the solution, conducting cooling, filtering and separating after thereaction is finished, and carrying out cleaning, drying and grinding treatment to obtain flower-like Bi2O2CO3; and (2) dispersing the flower-like Bi2O2CO3 powder in methanol to prepare a solution A, adding HAuCl4.4H2O into methanol to prepare a solution B, dropwise adding B into A under the condition of rapid stirring, and conducting stirring to a dry state, and scraping off the sample, conductinguniform grinding, and conducting calcining to obtain Au / Bi2O2CO3 / Bi2O3. According to the invention, the prepared flower-like Au / Bi2O2CO3 / Bi2O3 photocatalyst has very good photocatalytic activity under visible light.

The invention discloses a soft boiled egg preservative and application thereof in preparation of the soft boiled eggs, and belongs to the technical field of food preservation. The soft boiled egg preservative disclosed by the invention is prepared from the following components in percentages by mass: 5-15% of glucose oxidase, 17-28% of protein-glutaminase, 6-18% of phospholipase, 15-30% of citric acid and 20-40% of trisodium citrate dihydrate. According to the the soft boiled egg preservative of the invention, the glucose oxidase and the protein-glutaminase have synergistic effects with the citric acid and the phospholipase by cooperating with each other, so that the natural antibacterial ability can be improved, the adding amount of additives is reduced, and the edible safety of soft boiled egg foods is improved. When the soft boiled egg preservative is applied to the soft boiled eggs, the preservation effect of the soft boiled egg preservative can be effectively exerted, the phenomena that soft boiled egg soup becomes turbid and egg white is cracked are remarkably reduced, the total number of initial bacterial colonies and the number of coliform groups of the soft boiled eggs can be remarkably reduced, and the product has a long shelf life at normal temperature without adding chemical preservatives.

The invention discloses a FeNi-S@N-RGO nanosheet supercapacitor electrode material and a preparation method thereof. The preparation method comprises the following steps of S1, mixing nickel chloridehexahydrate, ferric nitrate nonahydrate, carbamide, trisodium citrate dihydrate and deionized water, carrying out hydrothermal reaction in a hydrothermal reactor, carrying out centrifuging after reaction is finished, and carrying out washing and drying; S2, adding sample FeNi LDH obtained in the S1 through the hydrothermal reaction and thioacetamide to ethanol solution, carrying out the hydrothermal reaction, carrying out the centrifuging after the reaction is finished, and carrying out the washing and the drying to obtain a FeNi-S sample; and S3, mixing the FeNi-S sample and RGO, and then calcining a mixture in a tube furnace, thereby preparing the FeNi-S@N-RGO nanosheet electrode material. The preparation method provided by the invention is environmentally friendly. The preparation method is simple. The preparation method is convenient for mass production.

The invention belongs to the field of biotechnology and relates to preparation of animal sperm low-temperature and freeze preservation diluents, in particular to a horse sperm low-temperature and freeze preservation liquid. The sperm low-temperature and freeze preservation diluent is prepared by combining sodium bicarbonate, hydroxyethylpiperazine ethane sulfonic acid, trisodium citrate dihydrate, potassium citrate monohydrate, sodium hydroxide, lactose, glucose, inositol, gentamicin, neomycin, apramycin, colistin, amphotericin, sodium pyrophosphate, sodium caseinate, whey protein, an antioxidant and deionized water. The horse sperm low-temperature and freeze preservation diluent can effectively increase the survival rate of sperms obtained after unfreezing of low-temperature and freezing of horse seminal fluid and the hybridization conception rate. Compared with a conventional method, the method is easy and stable to implement and especially remarkable in technical effect.

The invention discloses a zinc phosphate chemical conversion-hydrothermal compounding protection film and a preparation method thereof. The method comprises the steps that disodium hydrogen phosphate,zinc nitrate, sodium nitrite and sodium fluoride acid are prepared into a zinc phosphate solution, phosphoric acid is adopted for adjusting the pH of the zinc phosphate solution, and water bath heatpreservation is performed; a magnesium alloy sample is placed in the zinc phosphate solution, and after a stirring reaction is performed, the sample is taken out, cleaned and air-dried; the zinc nitrate and trisodium citrate dihydrate are dissolved in deionized water for preparing a mixed solution, then stearic acid is added to the mixed solution for stirring, and after even stirring is performed,the pH of the solution is adjusted by adopting ammonium hydroxide; the mixed solution is placed in a reaction kettle, then the magnesium alloy sample is placed in the reaction kettle, and heat preservation is conducted for 10-40 hours at 80-230 DEG C; and after the reaction kettle is naturally cooled to the room temperature, the sample is taken out, washed through the deionized water and dried toobtain the zinc phosphate chemical conversion-hydrothermal compounding protection film. According to the zinc phosphate chemical conversion-hydrothermal compounding protection film, the corrosion-resistance performance of magnesium alloy can be obviously improved, and accordingly the application range of the magnesium alloy is further enlarged.

The invention discloses a chemical plating solution formula for a Ni-P-Ag nano-coating and a plating process thereof. The formula comprises a plating solution A and a plating solution B, wherein the plating solution A and the plating solution B are used after being mixed. The plating solution A is prepared from the following components: 20 to 25g / L of nickel sulfate hexahydrate, 25 to 30g / L of sodium phosphite monohydrate, 50 to 100g / L of trisodium citrate dihydrate and 30 to 50g / L of pH buffering agent; the plating solution B is prepared from the following components: 1 to 2g / L of silver nitrate and 50 to 80mL / L of complexing agent. The plating process comprises the following steps: performing alkaline degreasing, acid pickling, and rust removing, and surface activation pretreatment; preparing and mixing the plating solution A and the plating solution B respectively; plating the mixed plating solution. The Ni-P-Ag nano-coating prepared by the formula and the process has a bright, clean, flat and firm surface, is 200 to 300 nanometers in nanoparticle diameter, has higher corrosion resistance and higher microorganism resistance, and has high application value in various energy, chemical and power equipment and devices needing antibacterial and anti-biofouling coatings.

The invention discloses a method for preparing strawberry cell nucleus suspension. The steps are as follows: 1) Take 50 mg of young strawberry leaves, put them in a plastic petri dish and add 1 ml of the extract, which is mainly composed of the following components at the final concentration: 14.8 g / L trisodium citrate dihydrate, 10 g / L Polyvinylpyrrolidone K-30, and Tween 20 at a volume concentration of 0.5%; 2) Use a blade to chop young strawberry leaves in the extract, then collect the extract and filter it through a 350-mesh nylon mesh to obtain a suspension of strawberry nuclei. The beneficial effects of the present invention: 1) The use of harmful reagents, such as mercaptoethanol, is reduced to the greatest extent, and the harm of the extract to the human body is reduced; 2) The extract has simple ingredients, only three kinds, all of which are conventional laboratory reagents, and the cost Inexpensive, easy to configure, can greatly reduce the cost; 3) The steps are simple, no centrifugation is required, which saves time and improves efficiency, and can obtain high-quality cell nucleus suspension for flow cytometry detection in a short time.

The present invention relates to an anticoagulant composition. Particularly, the anticoagulant is able to prevent coagulation of fish blood effectively. The anticoagulant comprises potassium chloride, sodium chloride, EDTA, trisodium citrate dehydrate and phosphate buffer.

The invention discloses an intravesical instillation liquid for treating struvite urinary stone of pet dogs and belongs to the medical field of pets. The intravesical instillation liquid is prepared from components by mass as follows: 20-30 g of tea polyphenol, 6-10 g of sodium hyaluronate, 10-15 g of a rhizoma imperatae extract, 10-15 parts of a common jasminorange leaf and twig extract and 1,000ml of a buffer medium. The buffer medium comprises components by mass as follows: 10-12 g of citric acid monohydrate, 14-16 g of trisodium citrate dihydrate and 1,000 ml of water for injection; the pH value of the buffer medium ranges from 4.5 to 5.5. The intravesical instillation liquid can improve the pH value of urine, promote litholysis and discharge, control urinary tract bacterial infection, protect bladder mucosa, stop bleeding and relieve pain caused by stone under the synergistic effect of all components. The intravesical instillation liquid is economical and convenient to operate and is a new generation of ideal chemical litholysis product for treating struvite stone.

1. A composition, which is an anthocyanin-based colorant composition comprising 50-90 mol-%, based on the total amount of anthocyanins, of pelargonidin-based anthocyanins, and wherein (i) >70 mol-% of all anthocyanins are acylated with at least one phenolic acid; and (ii) >20 mol-% of all anthocyanins are acylated with at least one hydroxycinnamic acid; and wherein the composition has a red color with a hue value H≧in the L*C*h* color system in the range of 10-30, measured at an L*-value of (70.0±0.1) in a 0.1 mol / l trisodium citrate dihydrate buffer at pH 3 in a 1 cm-length quartz cell using Spectraflash 650 (Datacolor) in transmission mode under D65 illuminant 10 Deg. Also, the present invention relates to use of the above compositions as a food colorant.

The invention relates to a crown-shaped oxygen-deficient tin oxide nanosheet array structure and a preparation method thereof, and belongs to the technical field of preparation and application of newenergy materials. According to the method, stannous chloride dihydrate and trisodium citrate dihydrate are used as raw materials, and the crown-shaped anoxic tin oxide nanosheet array structure is obtained through deposition and growth on a foamed nickel substrate by adopting a solvothermal method. The nanostructure is an array formed by a crown-like nanostructure in appearance, and each crown-like structure is formed by stacking oxygen-deficient tin oxide nanosheets in a staggered manner. The nanosheet array structure is large in specific surface area, small in material band gap, high in light absorption capacity, good in structural stability and thermal stability, non-toxic and harmless to a human body, and is an excellent visible light catalyst. The method is simple in raw material, equipment and technological process, clean, environment-friendly, mild in reaction condition, wide in applicability, high in technological parameter controllability, high in product yield, high in purityand easy to realize large-scale production.

The invention relates to a reagent erythrocyte preservation system and a preparation method thereof. The reagent erythrocyte preservation system comprises the following components: 0.400 g / L of citricacid-1 water, 6.100 g / L of trisodium citrate dihydrate, 20.500 g / L of glucose, 0.350 g / L of inosine, 0.143 g / L of chloramphenicol, 0.143 g / L of neomycin sulfate, 4.200g / L of NaCl, 0.500 g / L of adenine, 4.000 g / L of mannitol, and 3.000 g / L of potassium dihydrogen phosphate. Experiments prove that when the reagent erythrocyte preservation system is used for storing 3% of reagent erythrocytes at 2-8DEG C, the reagent erythrocytes can be effectively preserved for 90 days, and 15% of the reagent erythrocytes can be effectively preserved for 60 days. The preservation system has the advantages thatthe reagent erythrocytes obtained by using the preservation system are long in effective period, normal in appearance, high in red blood cell form proportion and good in antigen stability.

The invention discloses a screening method of resisting joint toxicity of heavy metals by trisodium citrate dehydrate. The screening method comprises the following steps: step one, preparing a mixed solution of multiple heavy metal pollutants; step two, determining LC50 of the heavy metal mixed solution by MTT; step three, by taking trisodium citrate dehydrate as an antagonist, sequentially mixing trisodium citrate dehydrate water solutions with different concentrations to be screened and the heavy metal mixed solution with concentration capable of causing the death of half number of cells, adding the mixture into a culture medium to be used as a cell line to be cultured; and step four, testing the survival activity of MTT cells, namely, poisoning for 24h, adding MTT, incubating for 3-4h, and measuring the survival activity of the cells, thus obtaining the resisting efficiency of the chemical antagonists with different concentrations to be screened. The screening method has the advantages that the screening rapid is high, the cost is low, and the antagonists with different concentrations can be screened simultaneously, so that the screening efficiency is high.

The invention discloses a zinc ferrite hollow sphere with a micro-nano structure and a preparation method of the zinc ferrite hollow sphere, wherein the hollow sphere is a micro-sphere with the diameter of 1.5-3 microns and comprises zinc ferrite hollow spheres, the sphere diameter of the zinc ferrite hollow spheres is 180-220 nm, the sphere wall thickness of the zinc ferrite hollow spheres is 28-32 nm, and the sphere wall is composed of zinc ferrite nano-particles; the method comprises the following steps: respectively preparing a urea aqueous solution, a trisodium citrate dihydrate aqueous solution, a ferric chloride hexahydrate aqueous solution and a zinc nitrate aqueous solution; uniformly mixing the urea aqueous solution and the trisodium citrate dihydrate aqueous solution; and sequentially adding the ferric chloride hexahydrate aqueous solution and the zinc nitrate aqueous solution into the obtained mixed solution, uniformly mixing, carrying out closed reaction on the obtained precursor solution at 120-180 DEG C, and sequentially carrying out solid-liquid separation, washing and drying treatment on the obtained reaction solution to obtain the target product. The material is uniform in size and large in specific surface area, and can be easily and widely commercially applied to the fields of photoconductive materials, water treatment, surface enhanced Raman scattering, sensors and the like.

The invention discloses a heavy metal chelating agent and a preparation method thereof. The heavy metal chelating agent is prepared from the following components in parts by weight: 35 to 40 parts of a dithiocarbamic acid compound, 0.8 to 1.2 parts of a penetrant, 1.0 to 1.5 parts of a polyoxyethylene surfactant, 4.0 to 5.0 parts of trisodium citrate dihydrate, 3.5 to 4.5 parts of ethylene diamine tetraacetic acid and 25 to 35 parts of soft water. The heavy metal chelating agent can remove trace heavy metals in dust.

The invention relates to a production process for complex Jing titanium, and belongs to chemurgy. Raw materials required in the production process comprise titanium dioxide, citric acid, trisodium citrate dihydrate, and potassium citrate monohydrate. The production process comprises the steps: mixing citric acid, trisodium citrate dihydrate and potassium citrate monohydrate with titanium dioxide respectively, heating to 100-150 DEG C in a stirring tank, and carrying out a reaction to generate citric acid complex titanium, to respectively obtain 5%-15% of water-soluble titanium dioxide. The production process for synthesis of the complex Jing titanium is simple, safe in synthesis, safe in use, low in cost, high in efficiency, and suitable for mass production.