9 results about "Trisodium citrate" patented technology

The invention discloses a method for preparing a ZnWO4 nanorod photocatalysis material. The method includes preparing a tungstic acid solution A, a zinc chloride solution B and a sodium citrate solution C; dropwise adding the solution A and the solution C into the solution B to form a solution D; regulating potential of hydrogen (pH) of the solution D to 6-8, and uniformly stirring to obtain a solution E; adding the solution E into a microwave hydrothermal reaction kettle, performing a heating reaction, naturally cooling the solution E to the room temperature after the reaction is finished, and taking out the reaction kettle; and opening the reaction kettle, washing a product for 4-6 times by deionized water and absolute ethyl alcohol, and drying to obtain the ZnWO4 nanorod photocatalysis material. According to the method, the microwave hydrothermal method is utilized to rapidly synthesize the ZnWO4 nanorod with the photocatalysis property, the later crystallization heat treatment is not required, the obtained product is high in purity, and the shape is controllable. The ZnWO4 nanorod with the photocatalysis effect can be synthesized in 10 minutes, and the degradation rate of the prepared ZnWO4 nanorod to rhodamine B in 50-60 minutes can reach to 97%-99%.

The invention belongs to the field of chemical engineering, and particular relates to a method for compounding a hexagon silver nanosheet. The method for compounding the hexagon silver nanosheet takes carboxymethyl glucan as stabilizing agents and sodium borohydride as reducing agents and uses an ammoniacal silver solution. According to the method for compounding the hexagon silver nanosheet, a prepared Ag(NH3)2OH solution is added in a conical flask, redistilled water and stirrers are further added, and the conical flask is placed in a magnetic stirring apparatus; trisodium citrate, hydrogen peroxide, carboxymethyl glucan, newly prepared NaBH4 are added in the solution in sequence under stirring, reaction is carried out for 3-5min at room temperature, and a blue hexagon silver nanosheet solution is simply obtained. Compared with other silver nanosheet compounding methods, the method for compounding the hexagon silver nanosheet has the advantages of being short in compounding cycle, simple in operation, low in cost, convenient to compound in large scale and the like. The maximum absorption peak position of the method for compounding the hexagon silver nanosheet is around 680nm, and the average particle diameter is around 45nm.

The invention discloses a preparation method of zif-8 nanosphere loaded SERS coded gold nanoparticles for intracellular photothermal therapy. The preparation method comprises the following specific steps: (1) reacting chloroauric acid with trisodium citrate to generate 13nm gold nanoparticles; (2) labeling gold nanoparticles by using a Raman reporter DTTC, and adding sulfydryl-containing polyethylene glycol to stabilize the gold nanoparticles; (3) adding polyethylene glycol with a sulfydryl group at one end and a carboxyl group at the other end into (2), modifying the surfaces of the gold nanoparticles with a large amount of carboxyl groups, adding adriamycin and an activating agent, and reacting the materials for 24 hours to obtain drug-loaded gold nanoparticles; and (4) dispersing the drug-loaded gold nanoparticles in the step (3) into zinc nitrate and ligand dimethylimidazole, and reacting the materials to obtain the zif-8 nanosphere loaded SERS coded gold nanoparticles. The SERS coded drug-loaded nanoparticles prepared by the invention can be used for inhibiting cell transfer and intracellular photothermal therapy, and the drug is loaded on the surfaces of the gold nanoparticles to realize internalization of the drug and kill cancer cells to the maximum extent.

The invention relates to a long-acting preservative for meat products. The preservative is prepared from the following raw materials in parts by weight: 1-3 parts of ethanol, 4-8 parts of rhus chinensis, 10-15 parts of sodium diacetate, 5-7 parts of potassium sorbate, 6-7 parts of calcium propionate, 11-15 parts of tea flower extract, 3-4 parts of glycerinum, 3-9 parts of lactic acid, 2-4 parts of trisodium phosphate, 1-3 parts of sodium lactate, 2-6 parts of sodium citrate, 0.3-0.5 part of nisin, 3-6 parts of sodium succinate and 0.6-1 part of malic acid. The long-acting preservative for meat products provided by the invention has the benefits that the long-acting preservative for meat products provided by the invention is long in acting time, good in effect and safe and efficient, and the taste of the meat products is not affected while corrosion is prevented.

The invention discloses a novel charged nanofiltration membrane for removing organic matter and a preparation method of the novel charged nanofiltration membrane. The preparation method comprises the following steps: (1) dissolving polysulfone resin into a mixture of DMF and ethylene glycol, and conducting stirring and degassing to obtain a resin membrane casting solution; (2) coating a non-woven fabric with the resin membrane casting solution, and performing phase inversion in deionized water to form pores, so as to obtain a porous polysulfone-based membrane; (3) preparing any one of a disodium hydrogen phosphate-citric acid buffer solution, a citric acid-sodium citrate buffer solution or an acetic acid-sodium acetate buffer solution; (4) adding chitosan, a piperazine monomer and an anti-pollution additive into the buffer solution, and uniformly conducting stirring to obtain a water-phase solution; (5) mixing trimesoyl chloride and isophthaloyl chloride, adding the mixture into an organic solvent, and uniformly conducting stirring to obtain an oil phase liquid; (6) cutting the porous polysulfone-based membrane, soaking the porous polysulfone-based membrane in the water-phase liquid, and removing the water-phase liquid on the surface of the porous polysulfone-based membrane after soaking; (7) conducting polymerizing in the oil phase liquid after soaking; and (8) after polymerization, conducting drying to obtain the novel charged nanofiltration membrane for organic matter removal.

The invention discloses a cracking binding solution for rapidly extracting RNA through a paramagnetic particle method, a kit and application of the cracking binding solution. The cracking binding solution comprises 0.1-1 mmol/L dodine, 5-1000 mol/L sodium chloride, 10-50 mmol/L sodium citrate, 10-60 mmol/L dithiothreitol, 1-30 mmol/L ethylenediamine tetraacetic acid disodium, 10-30% (v/v) 50% polyethylene glycol 8000 and 0.1-1% (v/300) 100% Proclin300. Compared with the prior art, when the cracking binding solution or the kit provided by the invention is applied to RNA extraction by a paramagnetic particle method, cells can be effectively lysed in a short time, and nucleic acid can be released. The lysate is stable in property and is matched with the magnetic beads to adsorb and recover nucleic acid.