185results about How to "Change pH" patented technology

The invention relates to the fields of analytical chemistry and food safety, in particular to a method for detecting the residual quantity of multiple alkaline drugs in animal derived food. Based on the vortex mixed extracting of acetonitrile, isopropanol and citric acid buffer solutions, the purification of a hydrophilic polystyrene-divinylbenzene solid phase extraction column and a cation exchange solid phase extraction column and the liquid phase chromatography-mass spectra determination, the method can detect the residual quantity of multiple alkaline drugs in pork, pork liver, eggs, shrimps and milk, such as beta-receptor agonists,sulfonamides, benzodiazepines, nitroimidazoles, benzimidazoles and triphenylmethanes. The method has the advantages of simple operation, fast and accurate detection and high efficiency.

The invention discloses a multi-walled carbon nanotube-loaded nano ferrofferic oxide (Fe3O4) catalyst and a preparation method and an application thereof. In the multi-walled carbon nanotube-loaded nano ferrofferic oxide catalyst, ferroferric oxide is distributed on the surface of the outer wall of the multi-walled carbon nanotube. The preparation process is simple, the cost is low, and easiness in industrialized popularization is realized. In the synthesized catalyst, the crystallinity of the Fe3O4 nano particles is high, the particle size is controllable, and the particles distribution is narrow. The catalytic activity of the multi-walled carbon nanotube-loaded nano ferrofferic oxide (Fe3O4) catalyst multi-walled carbon nanotube-loaded nano ferrofferic oxide (Fe3O4) catalyst (Fe3O4-MWCNTs) is high and the Fe3O4-MWCNTs is easy for being repeatedly used through magnetic separation. The Fe3O4-MWCNTs which is prepared by the method can be used as peroxide mimic enzyme and can be used as catalyst for organic pollutants which are difficult to degrade and for organic synthesis.

The invention provides a preparation method and a using method of human mesenchymal stem cell exosome freeze-dried powder, used for solving the problems of exosome such as low separation and recovery quantity, poor quality and low efficiency. The preparation method of the human mesenchymal stem cell exosome freeze-dried powder comprises the following steps: 1) performing culture, purification and passage on human mesenchymal stem cells; 2) inducing large-scale synthesis of the human mesenchymal stem cells and secreting functional exosome; 3) performing ultrafiltration and concentration on the exosome of the human mesenchymal stem cells, preparing a concentrated culture solution, and refrigerating; 4) preparing the freeze-dried powder from the refrigerated concentrated culture solution, and adding complex liquid into the freeze-dried powder for preserving. According to the method disclosed by the invention, synthesis of the human mesenchymal stem cells and secretion of the exosome can be effectively induced to the greatest degree, and the active ingredients are obtained on a large scale and are conveniently and directly used for various aspects of massive health, such as diagnosis and treatment of diseases and cosmetic plastic surgery of the human body.

The invention discloses a microfluidic chip electrophoretic-electrochemical detecting device with adjustable pH after separation and use of the device in aminoglycoside antibiotics analysis. The analysis device comprises a double-T shaped sampling channel, a separating channel, two auxiliary channels, a W-shaped channel and an electrode placement channel. Through adding the two auxiliary channels and the W-shaped channel at the tail end of the separating channel in a microfluidic chip, an alkaline solution is added through the auxiliary channels after being electrophoretically separated, and the solution from the separating channel and the auxiliary channels is mixed evenly through the W-shaped channel, a pH value of the solution in a working electrode determining region is improved, so that the solution meets a strong alkaline condition needed by the detection of carbohydrates, simultaneously, electrophoretic separation under an acidic separation buffer solution is not influenced. By the device disclosed by the invention, a transition metal nano material is decorated on the surface of the electrode by using an electrodeposition method and by means of the relatively large specific surface area and the special catalytic property of the metal nano material, so that the working electrode with high performance is obtained, and aminoglycoside antibiotics are determined through the amperometry.

Disclosed is a process for synthesizing benzaldehyde by selective oxidation of toluene, wherein the catalyst mainly comprises manganese, copper, cobalt, ferrum, nickel, zirconium, zinc, Argentine or/and halides of sodium, calcium, potassium, nitrates, sulfates, acetates, benzoates. The preparing process comprises letting in oxygen at the presence of the catalyst. When the conversion rate of toluene is 10%, the selectivity of benzaldehyde is 62%, the selectivity of benzoic alcohol is 14%, the selectivity of benzene carbonic acid is 22%, when the conversion rate of toluene is 39%, the selectivity of benzaldehyde is 20%, the selectivity of benzoic alcohol is 5%, the selectivity of benzene carbonic acid is 73%.

A process for extracting the active polyphenol substances from the natural plants includes such steps as washing, drying, pulverizing, loading it along with the deoxidizing purified water in an extractor, heating at 50-90 deg.C under the protection of inertial gas while stirring for 30-60 min in order to extract the active components or ultrasonic or microwave extracting for 10-40 min 1-5 times, collecting liquid extract, filtering, cooling concentrating and drying.

The invention relates to a technique of filling an infusion bag with hydrogen and discloses a device for filling a medical infusion bag with hydrogen in a non-contact manner. The device comprises a hydrogen generator (1), a gas and liquid mixer (2), a positive displacement pump (3), a vane pump (4), an open water tank (8), a pressure regulation valve (10), and a sealed water tank (7). By means of the hydrogen generator, the solubility of the hydrogen is improved while any characteristic of water is not changed. The positive displacement pump and the vane pump are used, so the hydrogen is processed into micro-nanometer bubbles, the solubility of the hydrogen in water is greatly improved, and the dissolving time of the hydrogen is shortened. The invention further discloses a method for filling the medical infusion bag with the hydrogen in a non-contact manner. The method comprises the steps of mixing gas and liquid, dissolving the gas under high pressure and releasing the micro-nanometer hydrogen bubbles under low pressure. The solubility of the hydrogen is high, the consumed time is short, the production cost is saved, the purity of the product is improved, the content of impurities is reduced, it is guaranteed that bacteria and heat sources are avoided in the operation process, and accordingly clinical requirements for injection are met.

The invention provides a magnetic field controllable sustained-release magnetic substance thickening liquid flow polishing pad. The polishing pad is a multilayer superimposed porous wear-resistant polishing pad. Pores are reserved in the polishing pad; abrasive capsules are embedded in the holes and contain a magnetic abrasive, a thickening phase and an acid-base agent. The invention discloses a polishing method applying the magnetic field controllable sustained-release magnetic substance thickening liquid flow polishing pad. After the magnetic field is applied, the abrasive capsules in the polishing pad are subjected to the action of the magnetic field; the magnetic abrasive in the abrasive capsules impacts shells of the capsules; when the magnetic field intensity is sufficient, the capsules are broken by impact, the polishing substance is released along the pores, and is gradually dispersed and dissolved in an aqueous solution to form sustained-release magnetic substance thickening liquid flow polishing liquid. After the magnetic field is removed, the abrasive capsules stop releasing the polishing substance, and the concentration of the polishing liquid no longer changes. Duringpolishing, the magnetic field acts on the magnetic abrasive. On the basis of the thickening phase thickening liquid flow, the thickening liquid flow characteristics of the polishing liquid are furtherenhanced, and the polishing efficiency is improved. The polishing pad has long service life and high polishing efficiency.

The invention discloses a method for preparing a medicine with liver target taxis for slow-releasing the nanometer microcapsule. The method comprises the following steps: proceeding with enzymatic reaction of liver target taxis gene with sugar monomer of cerebrose residue and ethylated carboxylate; copolymerizing vinyl ester with glycosyl and unsaturated cationic or anion; getting liver target taxis polyelectrolyte; getting the medicinal microcapsule with liver target taxis by multilayer packaging polyelectrolyte on the surface of medicine by electrostatic action, wherein the deactivation speed of microcapsule medicine can be controlled. The polymerization method is simple, high effective and non-toxicity. The coating method has the high efficient, the simple operation and the mild technology, which can cycle several times. The preparing medicine can save for a long time, which can release step by step, can accumulate in the liver, improves the medicinal effect of disease portion, reduces the toxic effect of the other healthy organ, and has the good application prospect.

The invention discloses an acid-base bifunctional catalyst for synthesis of methyl methacrylate by methyl propionate and formaldehyde. Active components of the catalyst are Cs and P, an auxiliary agent of the catalyst is one selected from the group consisting of Zr, Fe, Cu, La, Ce, Zn, Co, W and Mo, and a carrier of the catalyst is Al2O3 or Al2O3 treated by phosphoric acid, wherein Al2O3 is one selected from alpha-Al2O3, beta-Al2O3 and gamma-Al2O3. Based on the carrier, the loading capacity of the active components Cs and P is 5-20 wt% based on oxides, the loading capacity of the auxiliary agent is 0.1-1 wt% based on an oxide, and the concentration of a phosphoric acid treatment solution of the carrier is 1-5 wt%. The catalyst provided by the invention has better activity, selectivity andstability, and a simple preparation process, and is suitable for large-scale industrial application.

The invention discloses a matrix special for roof greening and belongs to the technical field of soilless culture. The matrix consists of vinegar residue, manioc waste, river sands, ceramsite, vermiculite and perlite and is characterized in that a formula of the matrix special for roof greening comprises, by volume, vinegar residue 20-30%, manioc waste 20-30%, river sands 10-20%, ceramsite 5-10%, vermiculite 15-20% and pumice 5-10%. The matrix water content is 25-35%, the organic content is larger than or equal to 25%, the total nutrient content is 1-3%, an EC value is 0.5-2.0mS/cm, and pH is 6-7.5. The soilless culture matrix special for roof greening mainly utilizes the vinegar residue and other organic wastes as raw materials, is produced through high-temperature fermentation treatment, turns waste into wealth and turns harm into good. In addition, the matrix is low in cost, light in texture, full in nutrition and capable of fixing plants well, does not influence the roof safety, is very suitable for roof greening and is a good matrix for horticultural crop soilless culture.

The invention belongs to the technical field of ceramic and particularly relates to ceramic glaze with a water activating function, a preparation method thereof, ceramic prepared by the ceramic glaze and a preparation method of the ceramic. The ceramic glaze is prepared by, by mass percentage, 60-80% of ceramic glaze base material, 5-20% of ceramic additives with the water activating function, 5-8% of nano-zirconia, 0.5-5% of phosphate, 1-5% of nano cesium oxide, 2-8% of yttrium oxide, 1-5% of nano titanium dioxide and 3-8% of tourmaline. The preparation method of the ceramic glaze includes: ball milling the ceramic glaze base material until all the ceramic glaze base material can pass a 250-mesh sieve, adding the rest of components, adding water and ceramic diluent to prepare slurry, ball milling, and discharging. The ceramic glaze has the advantages that the ceramic glaze can acts on water molecular cluster structures to allow the hydrogen bonds to be destroyed and chemical bonds to break, large molecular clusters become small molecular clusters only containing 5-6 water molecules, toxic gas dissolved in water is released at the same time, the water become slightly alkaline, and the activity of the water is increased.

The invention discloses a fertilizer for preventing bacterial wilt and promoting growth special for tomatoes. The fertilizer is prepared from pig manure, chicken manure, earthworm manure, bagasse, crucifer, urea, superphosphate, potassium sulphate, manganese sulfate, magnesium sulfate, ferrous sulfate, ammonium molybdate, borax, prohexadione-calcium, calcium metasilicate, calcium carbonate, phosphorous acid, heteroauxin, humic acid, attapulgite, bentonite, microbial flora, alkyl glycoside, oligosaccharins and polyaspartic acid. The fertilizer for preventing bacterial wilt and promoting growth special for the tomatoes is reasonable in formula, comprehensive in nutrition and capable of promoting growth of the tomatoes, the disease resistance of tomato plants is improved, and bacterial wilt can be effectively prevented and controlled.

The invention provides a preparation method of instant pickled beef, and relates to the technical field of food production. The method comprises the steps of preprocessing, tendering pickling, airing,roasting, cooling and packaging. A complex enzyme, compound phosphate and a pickling agent are adopted by the preparation method to perform tendering and pickling, the complex enzyme comprises, according to every gram of beef pieces, trypsase, papain and transglutaminase, the compound phosphate comprises sodium pyrophosphate, sodium tripolyphosphate and sodium hexametaphosphate; the pickling agent comprises carrageenan, soybean protein isolate, edible starch, edible salt, white sugar, five-spice powder, rice wine, soy sauce and a composite preservative. The method has the advantages that thetendering effect is improved, the elasticity of beef is improved and the taste is improved on the basis that the original flavor of the pickled beef is maintained.

The invention provides a fire coal desulfurization and denitrification decoking additive and a preparation process thereof. The fire coal desulfurization and denitrification decoking additive comprises a coal dust additive, which is added to the fire coal, and a catalytic activator, which is added to a slurry tank of a desulfurization system; and the preparation process comprises the following steps of: first, adding sodium carbonate, magnesium oxide, silicon dioxide, zinc oxide, manganese dioxide, copper oxide and barium oxide in sequence and stirring the mixture for 20 minutes; and then adding active calcium oxide and ammonium bicarbonate, and stirring the mixture for 10 minutes; uniformly mixing the mixture to obtain the coal dust additive; first stirring the active calcium oxide, active aluminum oxide and caustic calcined magnesite for 15 minutes; and then adding active carbon and calcium ammonium nitrate, and uniformly stirring the mixture to obtain the catalytic activator. According to the invention, without changing the traditional boiler and desulfurization equipment as well as the process thereof, the user selects corresponding additive and catalytic activator provided by the invention according to physical and chemical indexes of the coal so as to produce coal-saving, desulfurization, denitrification and decoking effects. During using high sulfur coals, the desulfurization efficiency is obviously increased and the SO2 emission reduction reaches the standard.

The invention discloses a production method for dried mutton. The production method comprises four steps of selecting and preprocessing a raw material, salting the raw material, curing and cutting, and drying by hot wind and microwave. Compared with the conventional drying method for producing dried mutton, a hot wind and microwave combined drying technology is adopted, so that the shortage of a single drying technology can be overcome, the advantages of hot wind drying and microwave drying are given into full play, the production cycle is shortened, the energy consumption is reduced, and the quality of a dried mutton product is improved. By adopting a salting way of uniformly applying salting materials and stacking material layers and mutton layers, the contact areas of the salting materials and mutton cubes can be greatly increased, the material liquid permeation speed is increased, and the produced dried mutton is fragrant and delicious in taste, proper in softness and hardness, chewy, scented, unique and long in aftertaste.

A chemical solution preparation method for a tungsten molybdate solid solution microcrystal is disclosed, which belongs to the field of luminescent material with a scheelite structure, and relates to a research about a novel chemical solution method preparation for a tungsten dimolybdate solid solution luminescent microcrystal host material. The solid solution microcrystal provided by the invention is expressed by a chemical general formula A(WO4)1-x(MoO4)x, wherein A is Ca, Sr or Ba; and x is not less than 0 and not greater than 1. The solid solution luminescent microcrystal of A(MoO4)x(WO4)(1-x) is obtained by adding A(NO3)2 solution, Na2MoO4 solution and Na2WO4 solution in corresponding amounts in a polytetrafluoroethylene beaker respectively according to the molar ratio of each raw material needed to prepare the microcrystal of a target system A(MoO4)x(WO4)(1-x) in a certain amount, stirring for 5 to 20 minutes at a normal temperature, then placing the polytetrafluoroethylene beaker in a high-pressure reactor; performing a hydrothermal reaction for 15 to 30 hours at 60 to 180 DEG C, and naturally cooling to a room temperature; centrifugally separating a precipitate, cleaning the precipitate by deionized water, then drying at 100 to 150 DEG C. The preparation technique disclosed by the invention is simple in equipment and low in reaction temperature; and the prepared luminescent microcrystal is pure in phase, uniform in granularity, controllable in grain size, regular in shape, excellent in luminescent performance, and good in practicability.

The invention relates to a deoiling-dephenolization combined treatment method for high-concentration phenol ammonia wastewater and a system. The treatment method comprises the following steps: (1) carrying out gas floating deoiling on a coke oven flue gas; (2) carrying out oil-water separation; (3) carrying out pressurized extraction dephenolization. A treatment system comprises a gas floating tank, an oil-water separator, an extraction device, a recycling tank and a flue gas buffer tank. As the coke oven flue gas is adopted as a foaming gas, the deoiling efficiency can be improved by virtue of nonpolar characteristics of carbon dioxide in the coke oven flue gas and the waste heat of the coke oven flue gas, and the acid gas carbon dioxide can be subjected to saturated absorption while deoiling is carried out; by changing the pH value of a solution, phenolate in wastewater can be induced to release phenolic substances of rich molecule modes, the allocation coefficient of the phenolic substances in an extraction agent can be increased, and the extraction efficiency can be improved; finally, through synergetic effects of gas floating deoiling and acidification and extraction procedures, the wastewater treatment efficiency is greatly improved, and three purposes can be achieved with one stroke.

The invention discloses a heavy metal curing agent for repairing vanadium ore contaminated soil and a repairing method. The heavy metal curing agent consists of the following components in percentage by weight: 65-75% of goethite and 25-35% of protonated chitosan, and the goethite which is ground to be 50 meshes and the ground protonated chitosan are mixed uniformly; the method for repairing the vanadium ore contaminated soil with the heavy metal curing agent comprises the following steps: deeply ploughing the contaminated soil, applying the curing agent and uniformly raking, watering in the process of deep ploughing and uniformly raking, wherein watering is performed once every other day in a maintenance period; and curing for 1-2 weeks. According to the heavy metal curing agent disclosed by the invention, the goethite, which is taken as a natural mineral, is free from toxicity and pollution, and the protonated chitosan is also conducive to the improvement of organic matter content in the soil and the increase of soil fertility; therefore after the mixture is applied, the pH value of the soil is not significantly changed, and the toxicity leaching rate of vanadium and other heavy metals in the repaired soil can be effectively reduced.

The invention discloses a clean pulping process for dissociated modified plant fibers. The clean pulping process comprises the following steps: (1) pre-processing raw materials; (2) preparing coarse pulp; (3) pulping; (4) removing sand; (5) screening; and (6) concentrating and extruding pulp. According to the clean pulping process disclosed by the invention, no sodium hydroxide is added, pulp-washing and bleaching processes can be reduced, and the wastewater in the pulping process can be sufficiently reutilized through simple treatment, so that pulping black liquor which is severely polluted is not produced. Meanwhile, plant fibers can be sufficiently dissociated, and the pulping quality is greatly improved.

A preparation method for oil-soluble orange flavochrome takes orange peel dry powder as the raw material and the oil-soluble orange flavochrome is obtained by the processes of acidolysis, zymohydrolysis and extraction. The preparation method adopts the zymohydrolysis method to complete the zymohydrolysis process to obtain the orange pectine and then the flavochrome is extracted, thus greatly saving the consumption of extractant and obviously lowering the cost. The product is natural pigment and is nontoxic and non-polluted, thus being applicable to be the colorant of oleaginous foods to replace synthetic food color.

The invention provides a novel special liquid fertilizer for rice capable of comprehensively controlling plant diseases and insect pests, and a preparation method thereof. The novel special liquid fertilizer is prepared from the following components: 5 to 15 parts of urea-ammonium nitrate solution, 5 to 15 parts of ammonium polyphosphate solution, 5 to 10 parts of potash fertilizer, 0.1 to 2 parts of microelement, 20 to 50 parts of water, 1 to 10 parts of homemade plant pesticide extracting solution, 1 to 2 parts of soil conditioner, 1 to 5 parts of natural activity organic materials, and 1 to 5 parts of natural surfactant, wherein the homemade plant pesticide extracting solution is prepared from mixing trifolium pratense, folium artemisiae argyi, herba houttuyniae, semen persicae and black false hellebore in proportion, and extracting with water. The preparation method comprises the steps of adding the prepared urea-ammonium nitrate solution and the ammonium polyphosphate solution in proportion according to a formula into a mixing tank; then adding the other metered materials into the mixing tank; stirring, dissolving and filtering to prepare the liquid fertilizer. The liquid fertilizer provided by the invention is convenient to use and good in effect, and is a special multi-functional environment-friendly liquid fertilizer for the rice.