210 results about "Ethylene diamine" patented technology

The invention discloses a method for preparing calcium hydroxide slurry with high specific surface area and high pore volume, which comprises the following steps: S1, adding an alcohol reagent into water to obtain a solution A; s2, adding an inorganic salt solution into the solution A, and uniformly mixing to obtain a solution B; s3, a reagent X is added into the solution B, ultrasonic mixing is performed to obtain a solution C, and the reagent X is a mixture of phenol or triethanolamine, ethidene diamine and ethylamine; and S4, adding calcium oxide powder into the solution C, continuously stirring, and reacting to obtain calcium hydroxide slurry. The invention provides a method for preparing calcium hydroxide slurry with high specific surface area and high pore volume, the calcium hydroxide slurry prepared by the method can form calcium hydroxide with high specific surface area and high pore volume when in use, and the method aims to solve the problems of low specific surface area and low pore volume of the existing calcium hydroxide. Therefore, the problem of desulfurization performance inactivation caused by blockage of calcium hydroxide (desulfurizer) pores by generated CaSO3 and CaSO4 in the desulfurization process is avoided.

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 provides a composite quality control liquid for an electrochemical multi-parameter detector. The composite quality control liquid comprises a buffer volume, a quality control substance and a stabilizer, the stabilizing agent comprises 5 to 50 g / L of bovine serum albumin, 0.1 to 10 g / L of EDTA-2Na (Ethylene Diamine Tetraacetic Acid), 10 to 100 g / L of a viscosity regulator, 0.3 to 25 g / L of a preservative and 5 to 20 g / L of a surfactant; the preparation method comprises the following steps: adding components of the stabilizer into a buffer system, preparing a preparation solution, preparing mother liquor of each quality control substance, proportionally mixing glucose mother liquor, uric acid mother liquor, beta-hydroxybutyric acid mother liquor and cholesterol sodium sulfate and triglyceride composite mother liquor according to the target concentration of the quality control solution, and fixing the volume by using the preparation solution to obtain the quality control liquid. And fully and uniformly mixing to obtain the composite quality control liquid. The composite quality control liquid can ensure that uric acid is not degraded, cholesterol triglyceride is not separated out, the formula is mild, and active substances in a detection system are not influenced.

A sheet molding compound (SMC) composition formulation including a curable resin, such as unsaturated polyester of vinyl ester, in an ethylenically unsaturated monomer; a low profile additive, in a curable solvent; and an intumescent additive, such as melamine polyphosphate or ethylene diamine phosphate. An article formed of the SMC composition formulation experiences no more than a 100% increase in thickness as compared to an initial thickness of the article after exposure to a flame. The low profile additive is present in the composition and the intumescent additive is present in the composition. The resulting article has a char strength at 3 mm thickness of between 100 and 1,000 Newtons.

The invention discloses an efficient extraction method of large-molecular-weight astragalus polysaccharide, which belongs to the technical field of plant extraction, and comprises the following steps: cleaning astragalus, filtering, and crushing; the preparation method comprises the following steps: mixing a beta-1, 3-glucanase aqueous solution and trehalose ethylene diamine, and stirring for 10-30 minutes to obtain an enzyme protection system; soaking the radix astragali powder in a citric acid solution, adding an enzyme protection system, applying a bipolar pulsed electric field, and reacting at 40-60 DEG C for 30-40 minutes; adjusting the concentration of the ethanol to 40-50%, standing, centrifuging and collecting crude astragalus polysaccharide; purifying, decolorizing, concentrating, freeze-drying and crushing the crude astragalus polysaccharide to obtain refined astragalus polysaccharide; the mass ratio of the trehalose ethylene diamine to the beta-1, 3-glucanase is (15: 1) to (30: 1). The enzyme protection system maintains the activity of the enzyme, the enzyme and the pulsed electric field act synergistically, the extraction time is shortened, and the extraction rate is increased while the astragalus polysaccharide with large molecular weight is obtained.

The invention discloses a sensing material for detecting atmospheric carboxylic acid, a preparation method, a detection method and application, belongs to the technical field of environmental functional materials, and solves the problems that an existing method is complex in operation and cannot realize real-time online monitoring, the sensing material for detecting atmospheric carboxylic acid is an MOF-802-EDTA-Pt composite film, and the preparation method comprises the following steps: taking 1, 3, 4, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5- The preparation method comprises the following steps: synthesizing an MOF-802 material through a hydrothermal reaction by taking 1, 3, 5-benzene tricarbonic acid (BTC) and aluminum nitrate as raw materials and ethylene diamine tetraacetic acid (Na-EDTA) as a ligand; the preparation method comprises the following steps: dispersing MOF-802 in DMF to form a coating solution, and forming a film on a glass substrate through a pulling method; and then loading platinum nanoparticles, and carrying out solvothermal reaction and vacuum drying to obtain the composite sensing film. The MOF-802-EDTA-Pt composite film has a porous structure and fluorescence characteristics, and detection is realized through a fluorescence quenching effect of carboxylic acid molecules and an MOF skeleton. The method disclosed by the invention is controllable in process and high in material stability, still keeps excellent selectivity under the coexistence condition of interferents such as CO2 and NO2, and is suitable for real-time monitoring of carboxylic acid pollutants in the atmospheric environment.

The invention provides a treatment method for removing EDTA-Ca in a high-salt and high-chlorine lithium-containing mother solution, and belongs to the technical field of lithium salt preparation. The treatment method sequentially comprises the following steps: S100, adjusting the pH value of the lithium-containing mother liquor to be treated to be acidic, and stirring to react for a period of time; s200, after stirring reaction, standing for a period of time, filtering to remove precipitate, and collecting filtrate; s300, adjusting the pH value of the filtrate to be alkaline, adding an oxidizing agent, and stirring to react for a period of time; and S400, heating for a period of time after stirring reaction, filtering to remove precipitate, and collecting filtrate to obtain treated lithium-containing mother liquor. The treatment method can effectively break complexation of EDTA-Ca in the high-salt and high-chlorine lithium-containing mother liquor, effectively remove calcium ions and reduce the EDTA content and solution complexation ability, and has the advantages of less lithium ion loss, low cost, simple and safe process and less impurity introduction.

The invention relates to the technical field of functional antioxidants, in particular to a stability-enhanced antioxidant based on pterostilbene and a preparation method and application thereof. The pterostilbene tablet comprises the following components in percentage by weight: 10-30% of pterostilbene, 8-20% of Arabic gum, 5-15% of tocopheryl succinate, 1-5% of disodium ethylene diamine tetraacetate, 30-60% of beta-cyclodextrin, 2-8% of rosmarinic acid, 1-6% of chitosan quaternary ammonium salt, 0.5-3% of nano silicon dioxide and 2-7% of polyglycerol fatty acid ester. In the preparation process, beta-cyclodextrin and pterostilbene form an inclusion compound, the dispersity of nano silicon dioxide and chitosan quaternary ammonium salt is improved through hydrogen bonds, and tea polyphenol or ascorbyl palmitate can be added to enhance the synergistic effect. The antioxidant is high in stability, high in pterostilbene retention rate, uniform in dispersion, free of agglomeration, excellent in antioxidant activity, suitable for the fields of foods, cosmetics and medicines, simple in preparation process, low in consumption and suitable for industrial production.

The invention belongs to the technical field of antibacterial polyurethane, and particularly relates to a preparation method of antibacterial polyurethane foam. The preparation method comprises the following steps: (1) adding 0.5-1 part by weight of water, 1-3 parts by weight of a catalyst, 1-6 parts by weight of a foam stabilizer and 0.5-1 part by weight of an inorganic antibacterial filler into 100 parts by weight of antibacterial polyether under the condition of 25-35 DEG C to obtain a combined material; (2) adding 100-110 parts by weight of polyisocyanate into the combined material obtained in the step (1) under the condition of 25-35 DEG C, stirring, foaming and curing to obtain polyurethane foam; the number-average molecular weight of the antibacterial polyether is 550-650, guanidine hydrochloride, cane sugar, diethylene glycol and ethidene diamine are used as initiators and react with epoxypropane to prepare the antibacterial polyether, and the mass fraction of epoxypropane in the antibacterial polyether is 75-80%. The foam prepared by the method is high in strength and high in antibacterial property.

The invention discloses a microbial odor remover suitable for environment and a preparation method thereof, and relates to the technical field of daily chemical products. The preparation method comprises the following steps: adding pediococcus acidilactici and bacillus velezensis into a citric acid-disodium hydrogen phosphate buffer solution according to a ratio, standing and activating, adding bromelain, lipase, rosmarinic acid nanoemulsion, tea polyphenol and citrus polyphenol-EDTA (Ethylene Diamine Tetraacetic Acid) mixture, homogenizing, adding konjac glucomannan-chitosan gel and a trehalose-glycerol compound according to a ratio, stirring, filtering, and drying to obtain a finished product. And subpackaging in a dark place to prepare the microbial odor remover suitable for the environment. Through the synergistic effect of microorganisms, enzymes and a natural deodorization medium, a multi-stage peculiar smell elimination system is constructed, the dual functions of immediate neutralization and continuous bacteriostasis are achieved, the application scene is wide, corrosion and residues to base materials such as fabric and plastic are avoided, and the concentration of harmful gas can be more effectively controlled and pathogenic microorganisms can be inhibited in large-scale breeding application.

The invention discloses a toning lotion composition, and belongs to the technical field of cosmetics. The toning lotion composition is prepared from the following preparation raw materials in percentage by mass; 0.09%-0.23% of a thickening agent, 2%-9% of an oily component, 0.1%-2% of a stabilizing agent and the balance of water; the thickening agent is prepared from agarose, gellan gum and xanthan gum; the stabilizing agent is selected from at least one of sodium chloride, calcium chloride or disodium EDTA (Ethylene Diamine Tetraacetic Acid); the viscosity of the toning lotion composition at the temperature of 25 DEG C is 50 to 500 Pa.s. The toning lotion has fresh and cool use feeling and moist degree of oil, is high in transparency and flexible in use mode, can be used as essence for smearing and can also be atomized through a spray bottle.

Disclosed herein are pharmaceutical formulations including epinephrine that have increased epinephrine retention over long-term storage, e.g., 30-months. In one aspect, a formulation includes: one or more of 0.1 mg / mL of epinephrine or a pharmaceutically acceptable salt thereof provided without any overage, a tonicity regulating agent including 8.2 mg / mL of sodium chloride, a pH adjusting agent including a mixture of 1.5 mg / mL sodium citrate dihydrate, 3.3 mg / mL of citric acid monohydrate, and, optionally, an as-needed amount of sodium hydroxide to maintain the pH level of the formulation within a range of 3.6 to 4.0, 0.075 mg / mL of sodium metabisulfite, and 4 μg / mL of ethylene diamine tetra-acetate disodium. The formulation has an API recovery of 94.5% or more after at least 30 months of storage at long-term storage conditions defined as 25° C.±2° C. at 1 atmosphere. In addition, in another aspect, a formulation includes 1 mg / mL of epinephrine and other ingredients.

The invention belongs to the technical field of dangerous solid waste treatment, and relates to a cascade deep detoxification method and system for waste incineration fly ash. Comprising the following steps: carrying out natural carbonation pretreatment on the fly ash to stabilize the pH value of the fly ash to be about neutral so as to obtain pretreated fly ash; carrying out primary washing on the pretreated fly ash by adopting an EDTA (Ethylene Diamine Tetraacetic Acid) solution, and carrying out solid-liquid separation to obtain primary washing slag; wherein the residual heavy metals in the first-stage washing slag obtained by the first-stage washing are mainly distributed in a weak acid extraction state; and carrying out second-stage washing on the first-stage washing slag by adopting an acetic acid solution. The method provided by the invention synergistically realizes deep and efficient removal of heavy metals in fly ash, and the final product meets safe disposal or resource utilization standards.

The invention relates to the technical field of lithium / sodium ion batteries, in particular to a preparation method of a highly graphitized coated carbon material based on phenolic resin, which comprises the following steps: uniformly mixing formaldehyde, resorcinol and a basic catalyst, and then catalyzing and curing; carrying out carbonization treatment on the uncarbonized phenolic resin based on a gradient heating method; mixing ethidene diamine, dichloromethane and carbonized phenolic resin, and heating in an oil bath; and placing the cured and coated graphitized phenolic resin in a tubular furnace for highly graphitizing. According to the preparation method of the highly-graphitized coated carbon material based on the phenolic resin, high ordering of a carbon layer is achieved through gradient heating graphitization, a carbon six-membered ring plane is promoted to expand, an ABAB stacked graphite structure is formed, the conductivity is effectively improved, a CVD coating and nitrogen doping synergistic technology is combined, a CVD reaction is formed through ethanediamine and dichloromethane, and the high-graphitization coated carbon material based on the phenolic resin is obtained. Functional groups such as pyridine-N and graphite-N are introduced to the surface of the carbon layer, so that the interface bonding force between the carbon layer and the matrix is enhanced, and the conductivity of the carbon layer is further improved.

The invention relates to the field of medicinal emulsifiable paste, in particular to compound fluconazole emulsifiable paste and a preparation method thereof. The compound fluconazole emulsifiable paste is prepared from the following components in parts by weight: 0.6 to 5 parts of fluconazole, 0.2 to 2 parts of neomycin sulfate, 0.1 to 0.2 part of triamcinolone acetonide, 5 to 15 parts of stearic acid, 10 to 25 parts of white vaseline, 2 to 8 parts of glyceryl monostearate, 0.5 to 3 parts of medicinal dimeticone, 1 to 5 parts of polysorbate-80, 0.1 to 0.3 part of sorbic acid, 0.1 to 1 part of vitamin E, 0.01 to 0.1 part of EDTA (Ethylene Diamine Tetraacetic Acid) disodium, 5 to 15 parts of glycerol and the balance of purified water, wherein the total amount is 100 parts. According to the application, the antioxidant property of the cream is improved by adding the vitamin E and the EDTA disodium, the vitamin E is used for directly scavenging free radicals, the EDTA disodium is used for eliminating an oxidation catalyst, and the quality guarantee period of the cream can be remarkably prolonged and the drug effect can be maintained by combining the vitamin E and the EDTA disodium.

The invention relates to the technical field of biology, in particular to a method for extracting PDRN from plants and application. In the preparation process, the casein is added, so that the casein and the PDRN are competitively combined with impurities in plants; enzyme is added for enzymolysis treatment, so that subsequent centrifugation and other operations are facilitated; the impurities are further removed by adding Tris-HCl, NaCl, CTAB (cetyltrimethyl ammonium bromide) and EDTA (ethylene diamine tetraacetic acid) and controlling each concentration. By adopting the method provided by the invention, the A260 / A280 of the PDRN extracted from the plant is greater than or equal to 1.69, the A260 / A230 is greater than or equal to 1.55, the PDRN has the advantage of high purity, and the obtained PDRN has the effects of resisting aging, repairing a barrier, resisting inflammation and the like, and has a good application prospect.

The invention discloses a solubility-resistant fluoride-free aqueous film-forming foam extinguishing agent and a preparation method thereof, and relates to the technical field of extinguishing agents. The invention discloses a soluble-resistant fluoride-free aqueous film-forming foam extinguishing agent. The cleaning agent is prepared from the following raw materials in parts by weight: 8 to 12 parts of a compound surfactant, 15 to 20 parts of modified polyvinyl acetate, 3 to 5 parts of modified xanthan gum, 5 to 8 parts of ethylene glycol butyl ether, 4 to 6 parts of propylene glycol, 0.5 to 1 part of benzotriazole, 0.3 to 0.6 part of triethanolamine, 0.2 to 0.4 part of disodium ethylene diamine tetraacetate, 0.8 to 1.2 parts of hydroxyethyl cellulose, 0.1 to 0.3 part of polyether modified silicone oil and 0.05 to 0.1 part of isothiazolinone. 6-9 parts of ammonium dihydrogen phosphate and the balance of deionized water. According to the anti-dissolution fluoride-free aqueous film-forming foam extinguishing agent, fluoride-free components are more environmentally friendly, and the requirement for green development is met; the compound surfactant has a synergistic effect with the modified polyvinyl acetate and the modified xanthan gum, so that the fire extinguishing efficiency and the solubility resistance are improved; the process is clear, parameters are clear, the product stability is good through ultrasonic dispersion and high-pressure homogenization treatment, the performance is optimized through multiple additives, and the application scene is wide.

The invention belongs to the technical field of dental pulp blood supply reconstruction, and relates to a multi-omics data fusion analysis method for EDTA (Ethylene Diamine Tetraacetic Acid) induced cell differentiation in dental pulp blood supply reconstruction. A space-time matched multi-level data basis is provided for analyzing a dynamic rule; then through standardization processing and difference analysis, screening out differential molecules which realize corresponding modes and are strongly related to phenotypes, focusing on core regulation and control candidate objects, and avoiding limitation of single omics; the method comprises the following steps: constructing a dynamic multi-layer regulation and control network comprising a transcription layer, a protein layer, a metabolism layer and interlayer connections thereof, finally identifying key nodes and modules through network topology analysis, tracking a time evolution rule in combination with dynamic trajectory analysis, and finally screening a core regulation and control module and predicting a cross-level key path. System analysis from multi-omics data to a hierarchical regulation and control mechanism and a dynamic rule is realized, and the limitation of single-dimension research is effectively broken through.

The invention relates to the technical field of biomedical materials, in particular to silver-containing collagen sponge and a preparation method thereof.The preparation method comprises the following steps that S1, silver salt is added into a collagen solution, and a first solution is obtained; s2, glutathione and ethylene diamine tetraacetic acid disodium salt are added into the first solution, and a second solution is obtained; s3, adding sodium alginate and chitosan into the second solution, and homogenizing to obtain a homogenized solution; and S4, carrying out freeze drying on the homogenized liquid to obtain the silver-containing collagen sponge. The preparation method of the silver-containing collagen sponge provided by the invention is simple in process, good in reproducibility and suitable for large-scale production; according to the silver-containing collagen sponge, chelating is stably combined with a microcapsule coating composite system, oxygen is isolated from silver ions, the oxidation rate of the silver ions is remarkably reduced, meanwhile, slow release of silver is achieved, and therefore the antibacterial time efficiency of the silver-containing collagen sponge can be prolonged.

The invention discloses a monovalent alkali metal ion doped iron-based perovskite type ceramic membrane as well as a preparation method and application thereof, and belongs to the technical field of mixed conductor oxygen permeation ceramic membrane materials. The method comprises the following steps: (1) synthesizing layered rock salt oxide M1 by adopting an EDTA-CA (Ethylene Diamine Tetraacetic Acid-Carboxylic Acid) sol-gel method; (2) mixing the M1 with other metal carbonate or oxide according to the stoichiometric ratio of the target perovskite oxide M2, and preparing a solid precursor M1 + M2 through a solid-phase reaction method; and (3) sintering the precursor into a compact ceramic membrane by using a static pressure-roasting method. According to the invention, the problem that monovalent alkali metal ions are easy to volatilize in a high-temperature solid-phase reaction is effectively solved through a process of stabilizing the alkali metal at a low temperature and then forming a film at a high temperature, and the monovalent alkali metal ions are successfully doped into iron-based perovskite crystal lattices. The prepared ceramic membrane has the advantages that the oxygen permeation flux is obviously improved while the good structural stability is maintained, and the ceramic membrane is particularly suitable for oxygen separation in an oxygen-enriched combustion process.

The invention relates to a collagenase-loaded LDH (layered double hydroxide) / EDTA (ethylene diamine tetraacetic acid) layered double hydroxide nano material as well as a preparation method and application thereof. The collagenase-loaded LDH / EDTA layered double hydroxide nano material is prepared from a zinc-aluminum layered double hydroxide LDH carrier, ethylenediamine tetraacetic acid EDTA inserted between layers of the LDH carrier through anion exchange, and collagenase loaded on the surface of the LDH carrier through an electrostatic adsorption effect. The invention further discloses a preparation method of the collagenase-loaded LDH / EDTA layered double hydroxide nano material for preparing the collagenase-loaded LDH / EDTA layered double hydroxide nano material for preparing the collagenase-loaded LDH / EDTA layered double hydroxide nano material.

The invention relates to the technical field of detergents, in particular to a dishwashing detergent for a descaling dishwasher and a preparation method of the dishwashing detergent, and the dishwashing detergent comprises non-fibrous components such as ethylene diamine tetraacetic acid, sodium hydroxide, sodium citrate, sodium polyacrylate, fatty alcohol-polyoxyethylene ether AEO-3 and the like. By optimizing the formula design, the problems of alkali scale and water scale residues are solved, phosphate is not contained, the efficient descaling capacity is achieved, and meanwhile the environmental protection performance is improved.

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 relates to the technical field of zinc hydrometallurgy, and discloses an analysis method for measuring high cobalt content by an EDTA complexing back titration method, which is based on the following steps: oxidizing Co < 2 + > into Co < 3 + > by using potassium nitrite in an acetic acid medium to form cobalt potassium nitrite precipitate so as to realize separation of cobalt and interfering ions, dissolving the precipitate, complexing with excessive EDTA, and performing back titration by using a zinc standard solution. Xylenol orange is used as an indicator, and determination is completed at room temperature in a hexamethylenetetramine buffer system with the pH value being approximately equal to 5.8. Coexisting ion interference is effectively eliminated through tartaric acid, sodium fluoride, thiourea and other masking agents, the method has the advantages of being easy and convenient to operate, sensitive in end point, high in accuracy and low in cost, and the requirement for conventional analysis of high-cobalt materials can be met.

The invention discloses a kHz crystal frequency electronic component production process, and belongs to the technical field of electronic component manufacturing. Comprising the steps of wafer cleaning, film coating, coarse adjustment, wafer feeding, curing, frequency adjustment, press sealing, pin cutting, backflow, wafer sleeving, aging and the like. A compound cleaning solution containing potassium hydroxide, EDTA (Ethylene Diamine Tetraacetic Acid) tetrasodium, sodium silicate and methyl isobutyl ketone is adopted for wafer cleaning, and residual impurities are removed in a gradient manner through five steps of processes of pre-chelation, main cleaning, solvent replacement, weak acid washing and ultrapure water washing in combination with outlet solution monitoring; (2) pre-cleaning by argon-oxygen mixed plasma before coating, activating by pure argon, and preparing a protective film by adopting a composite barrier liquid containing KR-38S, electronic-grade nano Al2O3 and a BHT hydrogen polymerization inhibitor; in the aging stage, a nitrogen-hydrogen-argon mixed atmosphere is adopted, and a honeycomb porous guide plate made of a quartz material is matched, so that the stability of an aging environment is optimized. The technical problems of wafer cleaning hidden residues, silver layer cross-process structure damage, poor frequency stability and the like in the prior art can be effectively solved.

A complex consisting of lipoic acid or a salt thereof, a chelating agent such as a salt of ethylene diamine tetraacetic acid (EDTA) or analogous compounds and an ester of ascorbic acid with long-chain fatty acids, in particular ascorbyl palmitate inhibits the pigmentation of teeth induced by chlorhexidine and salts thereof. In addition to the depigmenting complex, the formulations of the invention, in the form of gels, mouthwashes, toothpastes or periodontal sprays, may contain other ingredients such as hyaluronic acid or hyaluronates, glycerophosphocholine, sweeteners, flavourings, buffering agents, viscosifying agents, mucoadhesive and filming agents, solvents, co-solvents, surfactants.

The invention provides an angelica keiskei extracting solution with anti-wrinkle and firming effects and a preparation method of the angelica keiskei extracting solution. The preparation method comprises the following steps: extracting angelica keiskei by adopting hot water, adding EDTA (Ethylene Diamine Tetraacetic Acid) disodium before each extraction, adding ethanol into a concentrated solution in batches, carrying out cold precipitation overnight for refining and purifying, adding p-hydroxyacetophenone, EDTA disodium, 1, 2-hexanediol and 1, 3-butanediol into a filtrate, and uniformly stirring and mixing to obtain the angelica keiskei extract. The angelica keiskei extracting solution prepared by the method improves the discoloration problem under the conditions of high temperature and illumination, and meanwhile, the prepared angelica keiskei extract has remarkable anti-wrinkle, firming and anti-oxidation effects.

The present invention are co-crystals of Uric Acid with increased solubility with respect to crystals of Uric Acid, suitable for the pharmaceutical use. The invention comprises co-crystals with L-lysine, L-arginine, ethylene diamine, and tromethamine as co-formers, pharmaceutical compositions thereof and their therapeutical use in the prevention or treatment of cerebrovascular diseases.

The invention relates to the technical field of leather finishing agents, and discloses environment-friendly weather-resistant waterborne polyurethane for leather finishing and a preparation method of the environment-friendly weather-resistant waterborne polyurethane. The preparation method comprises the following steps: adding thiolated modified titanium dioxide into ethyl acetate, adding 4-allyl catechol, 2-methyl-2-acrylic acid-2, 2, 6, 6-tetramethyl-4-piperidyl ester and a photoinitiator, uniformly stirring, irradiating with ultraviolet light, filtering, washing, and drying to obtain a titanium dioxide weather-resistant agent; under the protection of nitrogen, heating polytetrahydrofuran glycol, composite modified montmorillonite and isophorone diisocyanate, adding a catalyst for reaction, adding dimethylolpropionic acid, stirring while keeping the temperature, adding ethylene glycol, and stirring while keeping the temperature to obtain a polyurethane prepolymer; and adding triethylamine, stirring, adding water and a titanium dioxide weather-resistant agent, uniformly dispersing, adding ethidene diamine, and uniformly stirring to obtain the waterborne polyurethane. The prepared waterborne polyurethane has good weather resistance and wear resistance.

Disclosed is a process for efficiently reclaiming copper and EDTA ligands from Cu-ethylene diamine tetraacetic acid (EDTA)-containing wastewater. The process includes: first, the initial pH value of the Cu(II)-EDTA containing wastewater was adjusted to ≥11.0; then proper amounts of formaldehyde and Cu0 powder were added into Cu(II)-EDTA containing wastewater; the hydrogen radical (H·) was generated through the Cu0-catalyzed HCHO reaction and involved in reductive decomplaxetion of Cu(II)-EDTA, resulting in formation of metallic copper and EDTA ligand; and subsequently, the metallic copper can be easily separated and recovered from wastewater after static settlement, and the recovery efficiency is up to 99.9%. In addition, EDTA ligand is efficiently recovered through acidification of the supernatant (pH=3.0), which dramatically reduce the concentration of total nitrogen in the wastewater.