67 results about "Citrate ion" patented technology

The invention discloses a platinum nano-material with the activity of four mimic enzymes and a preparation method thereof. The preparation method comprises the following steps: using citrate ions as a modifier, reducing chloroplatinic acid by utilizing sodium borohydride, and preparing the platinum nano-material modified by citric acid. The platinum nano-material is simply and quickly prepared, the particle size is small, and the dispersibility and stability of a water solution are high. The obtained platinum nano-material has the activity of four mimic enzymes at the same time, and comprises peroxidase, oxidase, catalase and superoxide dismutase. The activity of the four mimic enzymes of the platinum nano-material can be adjusted and controlled through the concentration of the citrate ions used in the preparation process.

The invention relates to a preparation method of a low-surface-residual-alkali nickel cobalt manganese ternary positive electrode material and belongs to the field of chemical energy storage batteries. The preparation method includes that boric acid or citric acid is dissolved in alcohol, so that a certain amount of free-state hydrogen ions are contained in a solution; a nickel cobalt manganese ternary positive electrode material is added then, acid-alkali neutralization reaction between H+ and material surface residual alkali is utilized, and reaction intensity is regulated through stirring time, so that the residual alkali on the surface of the material can be reduced effectively, and pH value of the surface of the material is lowered; an alcohol solution is used for flushing then, so that the surface of the material is ensured to be free of residual borate ions or citrate ions; alcohol molecules probably left on the surface are removed through a two-time calcining method, so that uniformity and stability of the material are improved.

The invention provides a weathering crust illuviation-type rare-earth ore leaching agent and a method for extracting rare earths by using the same, particularly a leaching agent solution for weathering crust illuviation-type rare-earth ores. The active component is citrate, wherein the citrate is any one of ammonium citrate, sodium citrate, potassium citrate and magnesium citrate, or mixture of sodium citrate, potassium citrate and magnesium citrate. The method for extracting rare earths from weathering crust illuviation-type rare-earth ores comprises the following steps: leaching by using the citrate as the active component of the leaching agent to obtain a rare-earth leaching mother solution, removing impurities, and adding a precipitant to obtain a rare-earth enriched substance. In the weathering crust illuviation-type rare-earth extraction process, cation exchange interaction and anion (citrate ion) complex action exist, and the two actions can cooperate to enhance the rare-earth recovery rate and lower the concentration and consumption of the leaching agent.

The invention relates to an analytically chemical detection method of dopamine and particularly relates to a dopamine detection method based on a surface enhanced resonance Raman spectrum. The dopamine detection method comprises the following steps: taking gold nano-particles obtained by taking sodium citrate as a reducing agent to reduce chloroauric acid as an SERRS substrate; taking ferric iron as a central body to be simultaneously coordinated with citrate ions remained on the surfaces of the gold nano-particles and dopamine molecules in a solution to be detected to form a citric acid-iron-DA complex, so as to selectively capture DA molecules in the solution to be detected; and forming resonance by the citric acid-iron-DA complex and Raman exciting light to generate a very strong SEERS signal so as to obtain an SEERS characteristic fingerprint signal of the DA molecules and realize high-sensitivity SERRS detection on the DA molecules. The detection method provided by the invention has the advantages that the needed materials are simple, the operation period is short and the cost is low; and the detection lower limit is very low.

The invention relates to a method of catalytically hydrating alkylene oxide to produce ethylene glycol. The method includes: under hydration reaction, subjecting alkylene oxide and water to contact with ion exchange resin catalyst; the ion exchange resin catalyst has a structural general formula that is shown in the description, wherein the symbol herein is macroporous nano composite resin matrix;M<-> is an anion, selected from bicarbonate ions, hydroxyl ions, hydrogen sulfite sulfites, carboxylate ions, and citrate ions; POSS is polyhedral oligomeric silsesquioxane unit; another symbol herein is an imidazolium cation unit; R is a connective group between the POSS unit and the imidazolium cation unit, and is alkylene or arylene.

The invention discloses an industrial preparation method of alkali copper sulfate. The used materials are non-toxic and harmless and can be obtained at low cost, which is good for industrial production; in the production process, citric acid root ion is used as a complexing agent so that the product grain size is increased, which is beneficial to cleaning; usually, washing just needs to be carried out twice and the production efficiency is improved; after reaction, the citric acid root ion is remained in the waste water, is non-toxic, pollution-free and degradable, and can be complex with heavy metal ions (such as arsenic and lead) possibly existing in the production system so that the heavy metal ions can be discharged out of the production system together with the waste water, thereby effectively preventing the heavy metal ions from entering the target output and further improving the purity of the product. In addition, ammonia nitrogen is not involved in the production process, thereby solving the problem of recycling of ammonia nitrogen in the traditional method. Therefore, the invention has favorable social and economical benefits.

This invention relates to electrolyte formulations and methods of use thereof to treat or prevent dehydration and taste fatigue. The electrolyte formulation of the invention addresses the needs of a broad population, particularly the needs of an older population. The electrolyte formulation of this invention comprises a dietary fiber source, such as Acacia Gum, a sodium ion source, a potassium ion source, a calcium ion source, a chloride ion source, and a citrate ion source.

The invention provides a preparation method of particle size controllable cuprous oxide micro-spheres, and belongs to the technical field of preparation of inorganic functional materials. The preparation method is characterized by comprising the following steps of: preparing an aqueous solution containing citrate ions and calcium hydroxide; agitating to obtain uniform suspension; adding phosphoric acid containing aqueous solution by drops; stopping dropping until the pH of the suspension is lowered down to reach 10; standing; washing with an ammonium chloride aqueous solution; preparing another aqueous solution through centrifugally separated hydroxyapatite colloid; adding copper sulfate; agitating to react for 12 hours; then adding glucose, sodium carbonate and trisodium citrate in sequence; reacting for 12 hours under the temperature of 95 DEG C; filtering; washing; drying to obtain the cuprous oxide micro-spheres. The preparation method has the advantages that the process is simple, the reaction temperature is low, the chemical agents adopted are safe, and the size of the cuprous oxide micro-spheres is conveniently controlled, and ranges from 0.5 to 10 microns.

The invention discloses a preparation method of hollow cerium dioxide. The preparation method comprises the following steps: S1, dissolving a water-soluble trivalent cerium salt, citric acid and / or citrate in deionized water to prepare a mixed solution, wherein the mass ratio of Ce <3+> to citrate ions in the mixed solution is 1: 1-2: 1; and S2, carrying out a hydrothermal reaction on the mixed solution at 180-230 DEG C for 1-5 hours to obtain hollow cerium dioxide. A template-free method is adopted, and hollow cerium dioxide is synthesized in one step in a high-temperature closed environment.The preparation method is simple and efficient in steps, micron-sized hollow cerium dioxide with uniform distribution is obtained, and the average particle size of hollow cerium dioxide is 4 [mu]m. The defects that in the prior art, a template and a surfactant are required, and complex after-treatments such as high-temperature sintering is needed are overcome, the production period of hollow cerium dioxide is effectively shortened, and the production cost of hollow cerium dioxide is reduced.

The invention provides a method for doping rare earth lanthanum in nano molybdenum powder, and belongs to the field of rare earth materials. The method includes the following steps that (1) ammonium paramolybdate, rare earth lanthanum nitrate and complexing agent citric acid are doped in a solution mode, the pH value of the solution is adjusted through HNO3 and NH3 water to be 1-3, complexing is performed on citrate ions, molybdate ions and rare earth ions to obtain a stable compound, water bath is performed on the solution at the temperature of 70-90 DEG C to obtain transparent faint yellow sol, and the transparent faint yellow sol is dried at the temperature of 100-120 DEG C to obtain xerogel; (2) the xerogel is sintered for 6 hours at the temperature of 560 DEG C, then in a four-tube sintering reduction furnace, two-step reduction is performed with hydrogen as a reducing agent to obtain doped MoO3 powder and doped Mo powder respectively, the reduction temperatures of the two-step reduction are 540 DEG C and 980 DEG C respectively, the doped nano rare earth molybdenum powder which is round and normal in particle and even in distribution is prepared, the size of doping phase is below 100nm, and the size of doped molybdenum powder particles is 300-500nm. According to the method, the nano molybdenum powder doped with the earth lanthanum evenly is prepared, and meanwhile chemical reaction sediments in the liquid-liquid doping process are eliminated.

The invention relates to a catalytic hydrating method of alkylene oxide, comprising the step of under hydration reaction, subjecting alkylene oxide and water to contact with ionized exchange resin, wherein the ionized exchange resin has a structural general formula shown in the description; the symbol herein is gel-type nano composite resin matrix; M<-> is an anion, selected from bicarbonate ions,hydroxyl ions, hydrogen sulfite sulfites, carboxylate ions, and citrate ions; POSS is polyhedral oligomeric silsesquioxane unit; another symbol herein is imidazolium cation; and R is a connective group between the POSS unit and is alkylene or arylene.

The invention relates to a stable lactoprotein liquid system and application thereof. The liquid system contains lactoprotein, Ca<2+>, Mg<2+> and citrate ions, wherein the mass fraction of milk protein is 0.01-20%, the difference value between the total molar concentration of the Ca<2+> and the Mg<2+> and the molar concentration of the citrate ions is less than or equal to 10mmol / L, and the pH ofthe liquid system is 7.0-10.0; the lactoprotein in the liquid system provided by the invention is high in stability, and can avoid precipitation and coagulation of the lactoprotein under the technological conditions of heating, shearing and the like, so that the application range of the lactoprotein is expanded; furthermore, the mouthfeel and the brewing property of the prepared product are improved.

This invention relates to electrolyte formulations and methods of use thereof to treat or prevent dehydration and taste fatigue. The electrolyte formulation of the invention addresses the needs of a broad population, particularly the needs of an older population. The electrolyte formulation of this invention comprises a dietary fiber source, such as Acacia Gum, a sodium ion source, a potassium ion source, a calcium ion source, a chloride ion source, and a citrate ion source.

The invention belongs to the field of medical in-vitro diagnosis, and particularly relates to an anticoagulant for a vacuum blood collection tube. The anticoagulant is prepared from the following rawmaterials in percentage by mass: 2.5 to 3.5 percent of sodium citrate, 0.1 to 0.3 percent of citric acid, 0.1 to 0.2 percent of ascorbic acid, 0.5 to 1 percent of biquaternary ammonium salt and 95.6 to 96.8 percent of water. Sodium citrate, citric acid and ascorbic acid form a buffer solution, and meanwhile, ascorbic acid and nitrogen can prevent citrate ions from being oxidized, so that the stability of the concentration of the citrate ions in the liquid is ensured, and the accuracy of the erythrocyte sedimentation rate measurement is improved.

The invention discloses a preparation method for dysprosium oxide powder. The preparation method comprises the steps that 1) a dysprosium-containing stock solution with the acidity of 0.03-1 mol / L andthe concentration of dysprosium chloride and / or dysprosium nitrate of 0.3-1 mol / L is prepared; 2) a deionized water mixed solution with the concentration of carbonate ions of 0.3-0.6 mol / L and the concentration of a composite dispersing agent of 0.0045-0.08 mol / L is prepared, wherein the composite dispersing agent comprises citrate ions with the concentration of 0.002-0.048 mol / L; 3) the dysprosium-containing stock solution is dropwise added into the deionized water mixed solution while stirring is carried out, the temperature of the reaction process is controlled to be 40-50 DEG C so as to obtain a white precipitate; and 4) the white precipitate is filtered, washed, dried and fired so as to obtain the dysprosium oxide powder. The dysprosium oxide powder prepared through the preparation method has the advantages of being small in particle size, low in apparent density, high in dispersion and less in agglomeration.

The invention relates to a process for the preparation of a product comprising one or more nanoparticles of calcium phosphate (CaP-NP) with negative surface charge having a ζ-potential in the range from −41.0 mV to −27.0 mV comprising the steps of: a) maintaining a mixture having a pH in the range from 7 to 10 and comprising an aqueous solution of calcium, an aqueous solution of phosphate and a solution of citrate ions at a temperature in the range from 20° C. to 40° C. for a time in the range from 30 seconds to 10 minutes; b) removing non-reacted ions from the solution of step a), thus obtaining a suspension of one or more nanoparticles of calcium phosphate (CaP-NP); c) recovering the product of one or more nanoparticles of calcium phosphate (CaP-NP) from the suspension of step b). In an advantageous embodiment, the process of the invention provides, in the mixture of step a), also an aqueous solution of one or more therapeutic / diagnostic compounds. The product of the invention may be used as a vehicle for one or more diagnostic / therapeutic compounds for the treatment of cardiovascular diseases through inhalation administration.

The invention provides an application of citrate ions and iron ions to inhibition of RNA viruses, particularly an application of an active ingredient to be used for preparing pharmaceutical composition for inhibiting the RNA viruses. The active ingredient at least comprises a substance A providing citrate ions C5H7O5COO<-> and a substance B providing iron ions in the molar ratio of the citrate ions to the iron ions being 1:8-8:1. The compounded active ingredient can effectively inhibit multiple RNA viruses, such as enterovirus, influenza virus, HIV and the like, when the citrate ions and the iron ions are applied in a specific proportion, the produced effect has certain correlation with the proportion. Besides, the substances providing the citrate ions and the iron ions are not limited, so that the compounded active ingredient is very easy to prepare, simple and cheap and has bright application prospect.

A system and method of enhancing the antimicrobial and biofilm-resistant efficacy of surfaces that have cationic polyelectrolytes nonleachably bound thereto in order to impart antimicrobial activity to the surface. The system for enhancing antimicrobial efficacy involves brushing, dipping, wiping, spraying, or storing the surface in a solution containing citrate ion. The method involves treatment of the surface with a solution which enhances the antimicrobial and biofilm-resistant efficacy of the surface, and which prevents a loss of the antimicrobial properties of the surface which may occur over time. Preferably, the enhancement agent is citrate ion and the cationic polyelectrolyte is poly(diallyldimethylammonium chloride), also known as polyDADMAC. The system is particularly beneficial for surfaces of articles such as contact lenses.

The disclosure provides oral care compositions comprising zinc ions and citrate ions with molar ratios which unexpectedly high zinc bioavailability, together with methods of preparing and using the same.

The invention discloses a blood dialysis solution, and belongs to the field of medical treatment. The blood dialysis solution comprises chloride ions, sodium ions, potassium ions, magnesium ions, citrate ions, glucose, calcium ions, 4,6-dichloro-5-nitryl-2-propylthiouracil, 0.2-5% W / V of pirfenidone, hydrogenacetate ions and bicarbonate particles.

The invention discloses a refine method of a sodium citrate mother solution. The refine method includes mixing the sodium citrate mother solution and a citric acid clear solution to obtain a mixture; contacting the obtained mixture with a modified anion exchange resin, and enabling a citrate ion to be absorbed to the modified anion exchange resin; and performing elution by means of a sodium hydroxide aqueous solution to obtain a sodium citrate solution. Functional groups of the modified anion exchange resin contain OH- and Cl-, the mole ratio between the functional group OH- and the functional group Cl- in the modified anion exchange resin is 1:(5-20), and based on the integral molar quantity of the functional groups of the modified anion exchange resin, the content of the functional group Cl- in the modified anion exchange resin is 4.7mole%- 16.7mole%. The refine method is capable of effectively improving the yield of sodium citrate so as to reduce the preparation cost of the sodium citrate.

Provided is a compound and composition capable of increasing a sugar content in a fruit by a simple method, without being restricted by a cultivation area of a plant or a climatic environment. The agent for increasing a sugar content in a fruit of a plant comprises a compound represented by the formula MX as an active ingredient, wherein M represents alkali metal ion or alkaline earth metal ion, and X represents carbonate ion, hydrogen carbonate ion, acetate ion, citrate ion, succinate ion, phosphate ion, hydrogen phosphate ion, or pyrophosphate ion.

A method for preparing a concentrated solution containing water, citrate ions and silver ions, including providing an amount of trisilver citrate, providing an amount of citric acid, wherein the amount of the citric acid is at least 19 times the amount of the trisilver citrate by weight, and mixing the trisilver citrate and the citric acid in an amount of water to produce the concentrated solution, wherein the amount of water is selected so that the concentrated solution has a citrate ion concentration which is at least 300 grams per liter. A concentrated solution containing water, citrate ions and silver ions, wherein the concentrated solution has a silver ion concentration which is at least 10 grams per liter. A diluted solution prepared by adding water to a concentrated solution containing water, citrate ions and silver ions.

The invention provides an aqueous solution preparation of sodium potassium hydrogen citrate for aerosol inhalation, wherein the aqueous solution preparation is used for reducing phlegm. In the aqueoussolution preparation of sodium potassium hydrogen citrate, the concentration of citrate is 10 to 110 mg / ml; a mol ratio of sodium ions to potassium ions is 1: 1; and the total mole number of sodium ions and potassium ions is 2.35 to 2.95 times the mole number of citrate ions.

The invention discloses a transparent gel hair care composition and a preparation method thereof. The transparent gel hair care composition is prepared from 0.1 to 50 percent of cationic surface active agent, 0.1 to 5 percent of moisturizing agent, 0.1 to 10 percent of hair conditioning agent, 0.1 to 30 percent of co-solvent, 0.05 to 1.0 percent of preservative, 0.5 to 2.0 percent of essence and the balance of deionized water, wherein the cationic surface active agent is a compound having the characteristics of quaternary ammonium salt R4N<+>N or a precursor having the structural characteristics and generated by virtue of chemical reaction, R4 is respectively a saturated alkane long chain of CH3 or C10 to C25, and at least one R is CH3- and at least one R is a saturated alkane long chain of C10 to C25, X represents anionic radicals with a chemical valence of -1 including chloride ions, lactate ions and citrate ions; and the moisturizing agent comprising small-molecular polyhydric alcohols or macromolecular polymers. The composition disclosed by the invention has a transparent gelling state, can provide an excellent moisturizing and conditioning effect to the hair, can effectively improve the wet rinsing performance, wet combing performance and dry combing performance of the hair, can reduce the electrostatic effect of the hair, and can enable the hair to be soft and smooth.

The invention relates to a method of catalytically hydrating alkylene oxide to produce ethylene glycol. The method includes: under hydration reaction, subjecting alkylene oxide and water to contact with ion exchange resin catalyst; the ion exchange resin catalyst has a structural general formula that is shown in the description; the symbol herein is gel-type nano composite resin matrix; M<-> is ananion, selected from bicarbonate ions, hydroxyl ions, hydrogen sulfite sulfites, carboxylate ions, and citrate ions; POSS is polyhedral oligomeric silsesquioxane unit; another symbol herein is an imidazolium cation; R is a connective group between the POSS unit and the imidazolium cation unit, and is alkylene or arylene.

The invention relates to a catalytic hydration reaction of alkylene oxide and a nano composite ion exchange resin catalyst thereof. The preparation process of the nano composite ion exchange resin catalyst comprises copolymerization of a nano material, a monomer and a cross-linking agent, a functionalization reaction of a copolymer and an ion exchange reaction. The nano composite ion exchange resin catalyst has the following structural general formula: P-N<+>R1R2R3M<->, wherein P is a nano composite resin matrix, R1, R2 and R3 are all fatty groups or aromatic groups CxHy, x is any integer from1 to 10, y is any integer from 3 to 21, and M<-> is an anion and selected from the group consisting of bicarbonate ions, hydroxide ions, bisulfite ions, carboxylate ions, citrate ions, heteropoly acid ions, trifluoromethanesulfonate, p-toluenesulfonate, benzenesulfonate, methanesulfonate, tetrafluoroborate or hexafluorophosphate. The catalyst can be applied to organic reactions such as catalytichydration of alkylene oxide.