167 results about "Oscillatory reaction" patented technology

The invention belongs to the field of deep processing of starch, and particularly relates to a method for preparing resistant starch employing a microwave technology. The method is characterized by comprising the following steps: (1) preparing a starch emulsion from raw starch, and pregelatinizing the starch by virtue of microwave; (2) carrying out autoclaving treatment on the pregelatinized material at proper temperature and pressure, cooling materials, and hydrolyzing the starch with heat-resistant alpha-amylase and pullulanase until the chain length is 20-120DP; (3) paving the material on a flat plate, storing at 4 DEG C for 3-5 hours, heating the material to 30-50 DEG C by virtue of the microwave, cooling to a room temperature, repeating the temperature circulating process for 2-4 times until the moisture content of the starch is smaller than 14%, crushing and sieving to obtain resistant starch A; and (4) adding water to the resistant starch A, carrying out thermal treatment, adjusting the pH to be 1.5-2, carrying out oscillating reaction, adjusting the pH to be 7-8, adding pancreatin for enzymolysis, filtering and drying a filter cake by airflow until the moisture content is smaller than 14%, and crushing and sieving through a 100-mesh sieve, so as to obtain high-purity resistant starch B.

The invention relates to an in-situ interfacial polymerization method of a fiber-based conductive polypyrrole / carbon nano tube composite electrode material. The method includes the following steps that: cellulose fiber fabric is immersed in an aqueous-phase solution containing an oxidizing agent, a surfactant and carbon nano tubes; an organic-phase solution containing monomers and a surfactant is added into the mixture of the cellulose fiber fabric and the aqueous-phase solution dropwise; and after the organic-phase solution is added into the mixture dropwise, the newly formed mixture is put into an ice-water mixing bath so as to be subjected to oscillation reaction. According to the in-situ interfacial polymerization method of the fiber-based conductive polypyrrole / carbon nano tube composite electrode material, the micro porosity of cellulose fibers is utilized; and the flexible composite electrode material which is jointly composed of fiber, conductive polypyrrole and carbon nano tubes is prepared in an in-situ polymerization mode. Compared with a traditional in-situ chemical polymerization method, and with the method of the invention adopted, reaction time can be shortened, and the structure of the electrode material is more uniform and regular, and resistivity of the electrode material is lower, and specific capacitance and cyclic stability of the electrode material is high. The method has a bright application prospect in the fields of portable electronic and energy products and intelligent textiles.

The invention relates to a biology chip reaction device that includes main box body, material carrying platform and constant temperature reaction device. Control circuit board, pump, electromagnetic valve, pressure adjusting device, vertical movement mechanism and horizontal movement mechanism are set in the main box body. The constant temperature reaction device is set at the side of material carrying platform. The device box body is made up of multilayer heat resistant material. Heating components are equally distributed in interlayer. Air cycling device and temperature sensors are set in the box body. An active door is set at the front wall of box body to keep sealing while the chip taking oscillating reaction. The control system realizes parameter setting, and finishing operation process and monitoring in real time and displaying on LCD. The invention is easy to operate, high automaticity, good accuracy and has no pollution.'

The invention relates to a method of preparing single-crystal and silver-nanometer rice noodles by reducing plant biomass, in particular to a method of preparing one-dimensional nanometer material. The invention provides a method of preparing the single-crystal and silver-nanometer rice noodles by reducing the plant biomass, which has the advantages that the technology is simple, convenient, rapid, economic and environment-friendly and has warm reaction conditions. The method comprises the following steps: adding 0.5g to 4.0g of plant leave dry powder to 50mL of distilled water to be boiled and cooled to a room temperature before being filtered; measuring filtrate to 50mL by the distilled water to obtain a plant leave extracting solution with the concentration of 10-80 g / L; mixing the plant leave extracting solution with a silver nitrate solution with the molar concentration of 0.5-8mmol / L and adding the solution into a water bath table concentrator for an oscillatory reaction so as to obtain a single-crystal and silver-nanometer rice noodle product.

The invention provides a method for preparing calcium carbonate by using catalysis of microbial carbonic anhydrase, which comprises the following steps of: adding the carbonic anhydrase extracted from a microbial culture into a liquid system containing calcium ion and bicarbonate radical ion solution or a gas diffusion system containing calcium ion solution and releasing CO2 by using ammonium hydrogen carbonate solution, performing oscillating reaction at room temperature, controlling initial pH at 5 to 10, taking out the produced sediment, and performing filtration, washing and drying to obtain the calcium carbonate. The method makes full use of microbial resources and characteristics of specificity and high efficiency of enzyme catalytic reaction, prepares the calcium carbonate by accelerated deposition, and has the advantages of riche resources, simple process, clean environment, low cost, high efficiency, quickness and the like. The calcium carbonate prepared by deposition has high purity, is calcite crystal calcium carbonate, can be used as an industrial filler, and can also be used for repairing cracks of building engineering, buildings, stone landscapes and carved stone cultural relics.

The present invention relates to preparation method of aflatoxin immuno-affinity column, including steps of: preparation of hydrazine antibody: employing sodium periodate oxidating unconjugated active area Fc hydroxoy of antibody to aldehyde group, and reacting with adipic dihydrazide to gain hydrazine antibody; preparation of aldehyde solid substrate: oxidating solid substrate containing continued diol structure by sodium periodate to gain aldehyde solid substrate; coupling of antibody and solid substrate: mixing hydrazine antibody and aldehyde solid substrate, adding sodium borohydride to seal unreacted aldehyde group on solid substrate after oscillating reaction to gain coupling antibody solid substrate; column packed. The present invention couples the unconjugated active area Fc end of antibody to solid substrate to remain activity of antibody better; hydrazide derived on antibody instead of solid substrate to avoid nonspecific adsorption of hydrazide group; the combined affinity column not introducing new groups ( such as carboxyl, amido and so on) except coupling antibody to avoid nonspecific adsorption from them.

The invention provides a preparation method of a polymer film with hydrophilic and anti-fouling performance. The preparation method is characterized by including the steps of firstly, adding macroinitiator end halogen polydimethyl siloxane, a complexing agent, a monomer, a catalyst cuprous halide and a solvent into a reaction container, heating to 20-120 DEG C under magnetic stirring, performing reaction for 1-72 hours, and purifying to obtain amphiphilic polymer; secondly, blending a polymer film material, a solvent, a pore-foaming agent and the amphiphilic polymer obtained in the first step to prepare a film casting solution, and using the film casting solution to prepare a hydrophilic polymer film; thirdly, placing the hydrophilic polymer film obtained in the second step into the ethanol solution of 3-bromo-propionic acid, performing oscillatory reaction under 0-70 DEG C to achieve surface amphoteric ionization of the polymer film so as to obtain the polymer film with hydrophilic and anti-fouling performance. The polymer film is applicable to water treatment and especially applicable to municipal water and industrial water purification.

The invention discloses a preparation process of a 68Ge line source used for PET attenuation correction, which aims to provide a preparation process of a 68Ge line source which has high utilization rate, uniform activity distribution and low cost and is used for PET attenuation correction. The process comprises the following steps: (1) putting a ceramic microsphere into a mixed solution of nitric acid and germanium chloride [68Ge], carrying out an oscillating reaction, taking out after the 68Ge is absorbed on the ceramic microsphere, washing and then airing; and (2) evenly filling the dried ceramic microsphere adsorbed with the 68Ge into a stainless steel tube one end of which is sealed, sealing the other end of the stainless steel tube by using glass wool, then sleeving the stainless steel tube into a stainless steel sleeve and finally, connecting the stainless steel sleeve with a magnetic tungsten steel base, wherein the concentration of the nitric acid in the mixed solution in the step (1) is 12 to 15mol / L, the concentration of Ge ions is not greater than 5mg / ml, and the adsorption time is 10 to 20min.

The invention discloses a heavy metal biological absorbent, a preparation method of the absorbent and an application in treating cadmium-containing wastewater. The heavy metal biological absorbent mainly consists of penicillium simplicissimum bacteria powder after being modified by rhamnolipid. The method for preparing the biological absorbent comprises the following main steps: culturing penicillium simplicissimum in a liquid culture medium, then continuously enlarging and culturing the cultured penicillium simplicissimum, adding the rhamnolipid taken as biosurfactants during the process, collecting fungus balls after the culture, cleaning the fungus balls with inorganic salt solution, freezing and drying the fungus balls to the constant weight and grinding the fungus balls into powder to obtain the heavy metal biological absorbent. In the application in treating the cadmium-containing wastewater, the heavy metal biological absorbent is mainly utilized to remove the cadmium in the wastewater, and the method mainly comprises the following steps: adding the heavy metal biological absorbent into the cadmium-containing wastewater, carrying out oscillatory reaction and completely removing after the filtration. The heavy metal biological absorbent has good absorption effect when being used for treating the cadmium-containing wastewater. The method for removing the cadmium contained in the wastewater has the advantages of simple operation conditions, low cost and high efficiency and is easy to implement.

The invention discloses a method for preparing a Ge sealed radioactive source, which consists of the following steps: putting 0.2 to 50 g of silicon dioxide with grain diameter of 50 to 400 meshes as an adsorbent in a reaction vessel, and adding 1 to 50 mL of 8 to 15 mol / L sulfuric acid water solution, 0.1 to 10 mL of Ge water solution with the radioactive concentration of 0.1 to 100 mCi / mL and 0 to 15 mL of 0.1 to 50 g / L water solution of a carrier germanium; performing stirring or oscillatory reaction on the mixture for 10 to 120 minutes under normal pressure; taking supernatant out of the reaction vessel, and washing and drying the sediment to be loaded into a stainless steel tube; and performing solder sealing on two ends of the tube, arranging the sealed stainless steel tube in a bushing, and assembling the bushing on a pedestal to prepare the Ge sealed radioactive source. The method has simple and convenient preparation process, the adsorbed solution can be reused, the pollution to the environment is reduced, and the cost for treating radioactive waste is reduced.

The invention provides a preparation apparatus and a preparation method for graphene. The apparatus comprises a first reaction vessel, a second reaction vessel, a first stirrer, a second stirrer and a pneumatic valve. The method comprises the following steps: introducing graphite powder and a dispersant into the first reaction vessel; introducing a reaction medium into the first reaction vessel, allowing the reaction medium to form a supercritical fluid, and allowing the graphite powder to undergo a reaction so as to obtain graphite powder reacted in the first reaction vessel; adjusting the pneumatic valve to allow the graphite powder reacted in the first reaction vessel and the dispersant to enter into a second reaction vessel with a normal pressure, introducing the reaction medium into the second reaction vessel, allowing the reaction medium to form a supercritical fluid, allowing the graphite powder to undergo a reaction so as to obtain graphite powder reacted in the second reaction vessel and repeating the previous steps several times so as to obtain a crude graphene product; and cleaning and drying the crude graphene product so as to obtain graphene. The preparation method for graphene utilizes performance of the supercritical fluid and the characteristics of a dual-reaction vessel oscillatory reaction so as to prepare high quality and high yield graphene.

The invention relates to methods for preparing and using a sudan red magnetic molecularly imprinted polymer. The methods aim to solve the problems that the conventional separated / purified sudan red I magnetic molecularly imprinted polymer has a 'solution polymerization' phenomenon in the synthesis process and the obtained separated / purified sudan red I magnetic molecularly imprinted polymer has a non-uniform spatial network structure. The preparation method comprises the following steps of: 1, preparation of Fe3O4; 2, preparation of magnetic SiO2; 3, preparation of aminated magnetic SiO2; 4, preparation of initiator / magnetic SiO2; and 5, polymerization reaction. The using method comprises the following steps of: adding the sudan red magnetic molecularly imprinted polymer into a sample solution containing sudan red, and then sequentially performing oscillatory reaction, magnetic separation and elution. The method is mainly used for preparing the sudan red magnetic molecularly imprinted polymer.

The invention relates to a sensitization-free and activation-free chemical silvering method for a polyamide base body. The method comprises the following steps: (1) soaking a polyamide fabric in a pretreatment solution, washing, taking out and cleanly rinsing to obtain the washed polyamide fabric, and performing ultraviolet laser radiation to obtain the treated polyamide fabric; (2) preparing chitosan and polyvinyl alcohol mixing solution, adjusting the pH value by using glacial acetic acid, and dropwise adding a cross-linking agent under a stirring state to obtain a chitosan derivative solution; (3) soaking the treated polyamide fabric obtained in the step (1) in the chitosan derivative solution, and baking to obtain the polyamide fabric modified by chitosan derivatives; and (4) soaking the modified polyamide fabric in a silvering reaction solution, chemically plating, performing vibrating reaction in a vibrating dyeing machine, and then taking out, washing and drying to obtain the polyamide base body. The preparation method is simple and convenient, production conditions and requirements are simple, and according to the method, sensitization-free and activation-free effects are achieved, the production cost is low and the environmental pollution is low.

The invention discloses a production method of a mulberry trunk biomass charcoal / iron and manganese oxide compound adsorbent. The production method of the trunk biomass charcoal / iron and manganese oxide compound adsorbent comprises the steps of adding crushed dried mulberry trunk powder into a ZnCl2 solution, stirring a mixture, and heating the mixture in a water bath for oscillation reaction; after naturally cooling, filtering and drying a product, conducting carbonization, grinding, screening, washing and drying on the product to obtain mulberry trunk biomass charcoal; placing a mulberry trunk biomass charcoal material in ultrapure water for ultrasonic treatment, adding a KMnO4 solution with magnetic stirring, heating a mixture in a water bath, and stirring the mixture; adding a NH4HCO3solution, and stirring a mixture; adding a FeSO4 solution dropwise, then using a NaOH solution for adjusting a mixture pH value to 6.0-8.0, heating a mixture in a water bath, and stirring the mixture;after naturally cooling, filtering and washing a product, drying the product to obtain the mulberry trunk biomass charcoal / iron and manganese oxide compound adsorbent. The production method of the mulberry trunk biomass charcoal / iron and manganese oxide compound adsorbent is simple in technology and equipment and easy to implement; and the obtained adsorbent has a good effect on treating chromium-containing wastewater, and can be widely applied in chromium-containing wastewater advanced treatment working procedures of industrial and mining enterprises.

The invention discloses a MOF-100(Fe) / bacterial cellulose composite material and a preparation method and application thereof. The preparation method comprises 1) activating a bacterial cellulose membrane in an alkali mixed solution to obtain an activated bacterial cellulose membrane, 2) orderly putting the activated bacterial cellulose membrane into an ethanol solution of ferric iron and an ethanol solution of trimesic acid, carrying out oscillation for a reaction and repeating oscillation multiple times to obtain the MOF-100(Fe) / bacterial cellulose composite material as a wet membrane, and 3) putting the wet membrane into an alkali solution for a reaction and carrying out washing to obtain the MOF-100(Fe) / bacterial cellulose composite material. The MOF-100(Fe) / bacterial cellulose composite material obtained through the cyclic oscillation method has good adsorption effects on organic pollutant diclofenac sodium and is easy to recover and recycle.

The invention discloses a chlorine-resistant polyamide composite reverse osmosis membrane and a preparation method thereof. The chlorine-resistant polyamide composite reverse osmosis membrane is prepared by immersing a polyamide reverse osmosis membrane in an active acyl chloride reactant solution with the concentration of 1 wt%-4 wt%, oscillating for reaction, carrying out secondary interfacial polymerization and forming a polyamide separation layer structure completely terminated by carboxyl groups. The chlorine-resistant polyamide composite reverse osmosis membrane overcomes the shortcomingof poor chlorine resistance of a conventional commercial reverse osmosis membrane, and the obtained composite reverse osmosis membrane has good salt rejection and chlorine resistance, can still maintain the rejection rate of more than 90% of NaCl under the chlorination condition of 30,000 ppm.h, can work for a long time under the condition of residual chlorine, and has wide application prospects.

The invention discloses a roxburgh rose polysaccharide functionalized nanometer selenium compound, a preparation method thereof and application of the roxburgh rose polysaccharide functionalized nanometer selenium compound in a blood glucose reducing drug and belongs to the technical field of nanometer selenium preparation. The preparation method comprises the following steps of (1) uniformly mixing a sodium selenite solution and a roxburgh rose polysaccharide solution, then adding a vitamin C solution, and performing uniform stirring and oscillatory reaction; and (2) dialyzing and drying a reaction liquid obtained in the step (1) to obtain the roxburgh rose polysaccharide functionalized nanometer selenium compound. By taking sodium selenite as a selenium source, vitamin C as a reducer andthe roxburgh rose polysaccharide (RTFP-3) as a surface modifier, the nanometer selenium compound (RP3-SeNPs) with the functionalized surface is environmentally friendly prepared, a nanometer seleniumpolysaccharide compound with good stability, narrow particle size distribution and good dispersibility is prepared, and the use of the roxburgh rose polysaccharide functionalized nanometer selenium compound in preparing a drug for inhibiting islet beta cell damages is provided.

The invention provides a compound material used for hexavalent chromium removal and a preparation method thereof. The compound material is prepared from charcoal and magnetic ferriferrous sulfide loaded onto a charcoal matrix; the preparation method comprises the steps that through a pyrolysis and calcination method, rice hull is used as a raw material to prepare the charcoal; the charcoal is immersed in a solution containing ferrous sulfate, L-cysteine is used as a sulfur source, ethylene glycol is used as a solvent, and through a solvothermal method, the magnetic charcoal / ferriferrous sulfide compound material is synthesized in one step; application comprises the steps that the compound material is added into hexavalent chromium wastewater with a concentration of 20 mg / L, the usage amount of the compound material is 0.2-1.0 g / L, and after oscillatory reaction is carried out for a period of time at 25 DEG C, a magnet is used for separating the compound material and the solution, so that hexavalent chromium ions in the wastewater are removed. The compound material used for hexavalent chromium removal and the preparation method thereof have the advantages that the compound materialpreparation method is simple, low in cost, environmentally friendly and high in efficiency of removing the hexavalent chromium ions in the wastewater and the like.

The invention relates to a method for using chitose the heavy metal in the boiling solution of mussel, which comprises that adding 5-15ml chitose into each milliliter of mussel solution, adjusting the pH value to 6-8.0, heating to 60-80Deg. C, vibrating at 150-300r / min, cooling, and eccentrically filtering. The invention can reduce the contents of cadmium and chromium and whole the nourishments of mussel.

The invention provides a bio-adsorbent for treating dye wastewater and a preparation method therefor and application thereof and belongs to the technical field of dye wastewater treatment. The bio-adsorbent contains the raw materials in parts by weight: 35-40 parts of edible fungus waste, 22-30 parts of bamboo shoot waste, 20-25 parts of pomelo peel and 5-12 parts of tea leaves. The preparation method comprises the steps of pretreating the raw materials, then, adding aqueous alkali into the pretreated raw materials, carrying out stirring, washing an activated product with water until the activated product is neutral, drying the washed activated product, then, adding a citric acid solution to soak the activated product, carrying out heating stirring, washing a modified product with water until the modified product is neutral, drying the modified product, then, adding an alcoholic solution to soak the modified product, carrying out ultrasonic wave assisted treatment, washing a product with water until the product is neutral, and drying and crushing the product, thereby obtaining the bio-adsorbent for treating the dye wastewater. According to the application of the bio-adsorbent in the treatment of the dye wastewater, the bio-adsorbent is added into a dye aqueous solution for oscillatory reaction, and filtering separation is carried out, so as to complete adsorption removal for the dye aqueous solution. According to the bio-adsorbent for treating the dye wastewater and the preparation method therefor and the application thereof, the problem of environmental pollution is solved, the resourcing of the wastes is realized, and the aim of treating wastes with wastes is achieved.

The invention relates to a method for extracting a flavonoids compound from zostera marina. According to the method provided by the invention, the zostera marina is taken as a raw material, the extracted flavonoids compound and metal salt are enabled to be in reaction, stirring is performed, temperature and pH value are adjusted, after the reaction, precipitates are collected and dissolved into an ethanol solution, then an EDTA decomplexing mixture is added for oscillating reaction, rotating and drying by distillation are performed, then methyl alcohol is added for dissolving and filtering, and then filtrate concentration and drying are performed, namely the flavonoids compound of the zostera marina can be obtained after purification. The method provided by the invention can enable the content of the flavonoids compound of the zostera marina to reach more than 55 percent. According to the method provided by the invention, the technological process is simple, the operation period is short, the raw material is easy to access, solvent recovery is easy, energy consumption is low, and the method is a purification method for the flavonoids compound and has broad prospects for development.

A method for preparing hollow cerium fluoride nanometer structure material comprises the steps as follows: the oscillating reaction adopts potassium bromate, sodium bromate-organic acid or sugar-cerium-sulphuric acid, with the consistence of 0.06 plus or minus 0.04, 0.06 plus or minus 0.04, 0.02 plus or minus 0.02 and 0.6 plus or minus 0.4mol / L respectively; Naf is adopted as the fluorin source with consistence of 0.1 to 0.5mol / L; the preparative process of hydro-thermal reaction is performed under the temperature of 110 to 170 DEG C. The cerium source can be K7Ce6F31 powder, ammonium ceric nitrate or ceric ammonium sulfate; the organic acid or the sugar can use the organic matter such as propane diacid, oxalic acid, sucrose and glucose to replace the citric acid. The preparation of the hollow cerium fluoride nanometer structure material needs 12 to 100 hours in a high pressure kettle having polyfluortetraethylene as the lining. Furthermore, the invention prepares the hollow cerium fluoride nanometer structure materials with hexagonal or circular section respectively by controlling the temperature of the hydro-thermal reaction.

The invention discloses a method for preparing an iodine-125 brachytherapy source core for treating tumor, which comprises the following steps: firstly, putting a standby filamentary silver in a 20-80 percent sodium hypochlorite solution, and performing oscillatory reaction at room temperature for one hour so that the surface of the filamentary silver is covered with a layer of compact AgCl deposition; and secondly, putting the filamentary silver into a mixture solution of an acetic acid buffer solution and a Na<125>I solution to react for one hour so that a layer of even and compact Ag<125>I deposition which is firm and hard to fall off is formed on the surface of the filamentary silver. The reagents used in the method are all conventional ones which are convenient to purchase and have low prices; irritant chlorine is not generated in the process of preparation; the surface of the iodine-125 brachytherapy source core is even and compact; the utilization rate of the radioiodine is high; and the process time is short, thus mass production is easy to realize.

The invention relates to the field of sewage processing, in particular relating to a composite material for processing sewage. The composite material for processing sewage is prepared from 28-48wt% of magnetic multi-wall carbon nano tube, 12-26wt% of bromelin and 28-50wt% of additive through the following steps: adding a proper quantity of water into the magnetic multi-wall carbon nano tube, and causing the magnetic multi-wall carbon nano tube to evenly disperse in the water; adding glutaraldehyde to prepare a multi-wall carbon nano tube carrier containing an active ester group; then adding into an ethyl[3-(dimethylamino)propyl] carbodiimide hydrochloride aqueous solution; adding a phosphate buffer solution (PBS) containing bromelin and glutaraldehyde for oscillatory reaction; and finally, washing with distilled water, and mixing with the additive after vacuum drying. The composite material disclosed by the invention can simultaneously carry out chemical oxidation and biodegradation processing for sewage and provides necessary conditions for simplifying the sewage processing process, effectively shortening the process flow and reducing the equipment and facility investment.

The invention relates to the technical field of preparation of road surface construction materials and in particular relates to a preparation method of water-permeable concrete. The preparation method comprises the following steps: taking natural sponge as a template; after washing the natural sponge with water, carrying out fumigation on the natural sponge with tetraethyl orthosilicate steam and then mixing the natural sponge with a dopamine solution; filtering and separating to obtain filtering residues; mixing the filtering residues with a sodium silicate solution and regulating the pH (Potential of Hydrogen) with hydrochloric acid; carrying out oscillation reaction to obtain a reaction solution; heating the reaction solution to raise the temperature; after stirring the solution to react, filtering the solution; after carbonizing a filter cake, immersing the filter cake with hydrofluoric acid to obtain self-made water-permeable particles; then crushing bean curd and mildewing; then fermenting and filtering to obtain fermentation filtrate; mixing the self-made water-permeable particles and the fermentation filtrate; fermenting and filtering a mixture to obtain fermented filtering residues, namely modified self-made water-permeable particles; finally, mixing the modified self-made water-permeable particles, common Portland cement, fly ash and the like to obtain the water-permeable concrete. The water-permeable concrete prepared by the preparation method has extremely good water permeability and mechanical compressive property and can be widely applied to road surface construction.

The invention relates to a method for quickly extracting carotenoid generated by an in-vitro enzyme reaction, belonging to the technical field of biological engineering. The method comprises the following steps of: ultrasonically breaking the wall of a recombinant bacillus coli strain expressing a carotenoid metabolism-related enzyme, adding corresponding reaction substances, ultrasonically mixing uniformly and undergoing an enclosed oscillating reaction in a dark place; adding a 10% SDS (Sodium Dodecyl Sulfate) solution into the mixed liquor, adding an NaAc solution, oscillating, centrifuging and removing supernatant to obtain protein precipitates; and adding acetone into the protein precipitates, stirring, uniformly dispersing the precipitates, centrifuging, extracting supernatant, filtering with a filter film and detecting to obtain an acetone solution of carotenoid. According to the method, carotenoid and proteins are co-precipitated and carotenoid is concentrated from a large-volume in-vitro reaction solution into a small quantity of protein precipitates, so that the subsequent separating and purifying processes are avoided.

The invention belongs to the preparation field of nano-sized iron oxide and particularly relates to an absorption agent for repairing water polluted by cadmium and a preparation method of the absorption agent.The preparation method includes the steps of firstly, preparing excoecaria cochinchinensis leaf extract; secondly, under room temperature, slowly dripping ferrous sulfate solution of 0.2mol / L into the excoecaria cochinchinensis leaf extract obtained in the first step, and well mixing to obtain mixed liquid; thirdly, feeding compressed oxygen into the mixed liquid obtained in the second step at the flow speed of 10-50ml / minute, and performing oscillatory reaction for 1 hour; fourthly, performing suction filtration on the reaction liquid in the third step after the reaction, washing with deionized water until the pH of leachate is constant, freeze drying the solid obtained by filtration for more than 8 hours, grinding, and sieving with a 200-mesh sieve to obtain the nano-sized iron oxide.The preparation method has the advantages that the method is environmental friendly in raw material, low in cost and free of environmental pollution, the synthesized nano-sized iron oxide can evidently remove the cadmium in the water polluted by the cadmium, and the removing rate reaches up to 82%.

The invention belongs to the technical field of biomedical materials, and particularly relates to an extraction method of bovine tendon type I collagen. The extraction method comprises the following steps: washing fresh bovine tendons, removing fat, aponeuroses and muscles, cutting the bovine tendons into tendon blocks, soaking the tendon blocks with a sodium bicarbonate aqueous solution, cleaning, and airing to obtain pure bovine tendons; adding the pure bovine tendons in a triethanolamine-containing myristic acid solution for soaking, and cleaning and airing the soaked pure bovine tendons; adding the aired pure bovine tendons in liquid nitrogen, and grinding into powder to obtain bovine tendon powder; taking the bovine tendon powder, adding the bovine tendon powder in an acetic acid-sodium acetate buffer solution, adding pepsin and squalene, uniformly stirring, carrying out enzymatic hydrolysis, then adding glycol dimercaptoacetate, and carrying out oscillating reaction to obtain enzymolysis liquid; and carrying out salting-out and dialysis on the enzymolysis liquid to obtain the bovine tendon type I collagen. The preparation method provided by the invention is simple and the equipment requirement is low; and the obtained product is high-purity type I collagen with a triple helix structure, cannot cause mechanical injuries on nervous tissues, and is good in biocompatibility.

The invention discloses a method for preparing ultrafine fiber polyurethane synthetic leather by carbon nanotubes grafted with modified nano-titanium dioxide on the surfaces. The method comprises: diluting polyurethane resin with a solvent, adding a filler light calcium carbonate, a defoaming agent, a thickener, a nanometer titanium dioxide powder suspension, and carbon nanotubes grafted with polyacryloyl chloride on the surfaces into the solution, carrying out ultrasonic dispersion to obtain a uniform polyurethane impregnated emulsion, rolling a base cloth pretreated by polyvinyl alcohol through a roller coater with the polyurethane impregnated emulsion, putting the base cloth into a water-DMF mixed coagulating bath to obtain solid polyurethane, putting the base cloth into an aqueous solution, carrying out stirring so that the polyvinyl alcohol is degraded and dissolved, drying the base cloth, dipping the washed dried base cloth into a mixed solution of sodium hydroxide, ethylenediamine and a penetrant, carrying out vibration for a reaction, and opening fibers to obtain the ultrafine fiber polyurethane synthetic leather.