43results about How to "Strong purity" patented technology

The invention relates to a preparation method of a human IgG immunomagnetic bead (IMB) for staphylococcus aureus enrichment. With a magnetic bead as a carrier and human IgG as a recognition intermediate, the human IgG immunomagnetic bead is prepared through the processes of activation, coupling, washing and blocking. The human IgG immunomagnetic bead incubated in an appropriate buffer solution and under certain conditions can be used for high efficiency capture and enrichment of staphylococcus aureuses in a detection sample. The method of the invention has the advantages of strong specificity, high efficiency and rapidity, simple operation, low cost, and has no need for large equipment as well as specially trained professional operation personnel. Also, the sample needs no special pretreatment. Therefore, the method provided in the invention can be widely used for enrichment separation and detection of staphylococcus aureuses in food, feed, cosmetics, environment and clinics.

The invention belongs to a preparation technology of natural antioxidant, particularly relates to a preparation method of antioxidant in blueberry leaves. The preparation method of the antioxidant in the blueberry leaves includes the steps as follows: (1) collecting fresh blueberry leaves, washing the fresh blueberry leaves with water, draining away water, shearing the leaves into segments with different length, adding 8-14 times water, adjusting pH to 3-8, conducting extraction in hot-water bath at the temperature of 90-100 DEG C, filtering the extract, and decompressing and concentrating the extract to 15-25 times of original concentration at the temperature of 50-60 DEG C; and (2) conducting adsorption with macroporous resin, eluting with water and 10%-30% alcohol, detecting by ultraviolet spectrophotometry, collecting adsorbed eluent with strong antioxidant activity at 280nm part, decompressing and concentrating the collected eluent to paste, and conducting vacuum-drying at the temperature 50-60 DEG C, thus obtaining light brown powder. The preparation method is simple in technology, friendly to environment and good in purity; and the product is safe and has strong antioxidantactivity.

The invention discloses a method for preparing copper powder with a silver-plated surface and belongs to the field of processes of plating silver on the surface of copper powder. The method for preparing the copper powder with the silver-plated surface is characterized by comprising the following steps: reducing Cu<2+> to Cu atoms by redox reaction between a soluble copper salt and a reducing agent in a liquid phase to prepare needed copper powder; adding an AgNO3 solution into ethylenediamine tetraacetic acid, stirring, adding the copper powder, and performing replacement reaction between Cu and Ag<+> to obtain Ag which is precipitated on the surface of the copper powder; and washing with distilled water, and then baking to obtain the copper powder with the silver-plated surface. The silver plating treatment on the surface of the copper powder can be finished by improving an existing copper powder preparing process, and the copper powder with the silver-plated surface is prepared; and under a condition that excellent characters of the copper powder are kept, the oxidation resistance of the copper powder is effectively improved, and the application range of the copper powder is enlarged. The method for preparing the copper powder with the silver-plated surface is simple in preparation process, easy to operate and suitable for popularization and application.

The invention discloses a metal boride coating and a preparation method thereof. The preparation method comprises the steps that solid inorganic salt is mixed and ball-milled to be micron-sized, metalboride nanoparticles are added into the ball-milled mixed salt, then acetone liquid is added, ultrasonic dispersion is conducted, and solid mixed salt containing the metal boride nanoparticles is obtained after vacuumizing and heating in a vacuum drying box; solid inorganic salt is put into a crucible, and is heated to be fused in a resistance furnace under the protection of inert gas, the solidmixed salt is added into the fused inorganic salt to form nanometer inorganic fused salt, after stabilizing, a graphite anode and a cathode to be deposited are inserted into the crucible, and the metal boride coating can be obtained after electrophoretic deposition. According to the method, the high-temperature environment of the inorganic fused salt is utilized, the two procedures of electrophoretic deposition and sintering of the metal boride nanoparticles in the inorganic fused salt are carried out at the same time, namely electrophoretic deposition and sintering are carried out at the sametime, and therefore the compact metal boride coating with high binding force is obtained.

An organic electroluminescent material emitting blue light for the organic electroluminescent device is prepared through preparing the solution of 8-hydroxy quinoline in alcohol or acetone, adding triethyleneamine and aqueous solution of lithium sulfate, heaitng while stirring for reaction, filtering, washing and baking. Its advantages are high output rate and purity, high luminescent efficient and color purity, and high thermal stability.

The invention discloses a preparation method of a flexible nanometer interface composite textile material. A magnetron sputtering method is utilized to establish a layer of flexible nanometer material on the surface of a fiber reinforcement body so as to improve the flexibility of a fiber reinforcement body material and the surface bonding strength between the fiber reinforcement body material and a basic material. Compared with the prior art, a film obtained through magnetron sputtering is good in compactness and high in purity, the bonding performance of the basic material and the film is good, and the basic material is not damaged. A corresponding function can be added for the composite material while the effect of a flexible interlayer layer is played.

The invention provides a recovery method of a waste lithium iron phosphate battery positive electrode material. The recovery method comprises: (1) removing a binder from a positive electrode sheet obtained by disassembling a waste lithium iron phosphate battery, separating out a current collector to obtain a waste positive electrode material, dissolving the waste positive electrode material with nitric acid, and filtering to obtain a first filtrate; and (2) heating the first filtrate at 50-90 DEG C for 1-4 hours to completely oxidize ferrous ions in the first filtrate, adding ammonia water toadjust the pH value of the system to 1-2, continuously heating at 60-90 DEG C for 1-4 hours, filtering to obtain a first filter residue and a lithium-containing filtrate; and washing the first filterresidue for multiple times by adopting a shearing emulsification pump to obtain high-purity iron phosphate. According to the method, when the first filtrate is directly heated, ferrous ions can be completely oxidized, an oxidizing agent does not need to be added, and then the ferrous ions are converted into high-purity iron phosphate. The method is simple to operate, low in cost and environment-friendly.

The invention discloses a NaSbS2 nano material preparation method and belongs to the technical field of nano material preparation. Na3SbS4.9H2O prepared by a water bath method is utilized as a precursor material; water is utilized as a solvent, so that safety hazards caused by heat evaporation of an organic solvent and effects on the sample purity are avoided, and feasibility is strong; a reactionprocess is performed in a container with an opening, an expensive high-pressure reaction kettle has no need to be used, and limit of the reaction container volume is avoided; the technological conditions have the advantages of moderate conditions, environmental friendliness, simpleness and low cost; a NaSbS2 nanoparticle material can be prepared under a low temperature through heat treatment in the argon atmosphere; the NaSbS2 nanoparticle material has the advantages of good crystallinity, high purity, even dispersion and even morphology. According to the NaSbS2 nano material preparation method disclosed by the invention, the reaction raw materials are easy to obtain, the cost is low, processing equipment is simple, and energy consumption is low; furthermore, the precursor is prepared under the normal pressure, so that safety is good, and feasibility is strong; thus, the NaSbS2 nano material preparation method has the advantages of economic property, practicability and very good industrialization prospect.

The invention discloses vibrio marinopraesens and a separation method thereof. Vibrio marinopraesens HN897 generating agarase is separated and obtained from seawater samples of coastal areas in SouthChina, and is preserved in China General Microbiological Culture Collection Center on August 8, 2018 with the preservation number of CGMCC NO.16232. Through species identification, the vibrio marinopraesens HN897 is shown as Vibrio astriarenae. The bacterial strain cultured on a solid agar plate shows that the bacterial strain has the capacity for degrading agar, and the activity of agarase secreted from 2 culturing liquid (TSB and LB) shows that the bacterial strain has high-yield capacity of agarase. Therefore, the vibrio marinopraesens HN897 has wide application and market prospects in thebiopharmaceutical fields of agaro-oligosaccharides and the like, and besides, establishes a basis for subsequent preparation of enzyme products being high in vitality and high in purity.

The invention discloses a preparation method of pear dietary fiber. According to the preparation method, the problems of low utilization rate of pear residue raw materials, high processing cost, low product yield and the like are solved, a three-phase preparation separation technology is utilized to simultaneously decolor and deproteinize, the method is high in efficiency and short-time, the prepared pear residue dietary fiber has the advantages of small particle size, good color, strong water holding capacity and swelling capacity and good activity, the obtained soluble dietary fiber can be used as a food additive of beverages, biscuits, bread, noodles, pastries, ice cream, instant coffee, chocolate or milk tablets, or can be prepared into tablets, capsules or granules, the obtained insoluble dietary fiber can be used for making dietary fiber biscuits, bread, noodles or pastries, or can be prepared into tablets, capsules or granules, and the obtained soluble dietary fiber can be mixed with the insoluble dietary fiber to prepare tablets, capsules or granules.

The invention discloses a method for preparing a high-wear-resistance hard alloy in a powder metallurgy process. The method comprises the steps of raw material selection, drying, smashing, ball milling for mixing, cold press formation, high-temperature sintering, carburizing treatment and the like. According to the method for preparing the high-wear-resistance hard alloy in the powder metallurgy process, the preparation method is simple and scientific, by optimizing the process steps and the technical parameters, silicon carbide, hafnium carbide, manganese zinc ferrite and other raw materialsare added on the basis of iron powder and aluminum powder, the hard alloy prepared by using the method is resistant to high temperature, high in strength, resistant to wear, high in hardness, high indensity, high in anti-corrosion capacity, low in coefficient of thermal expansion, high in purity and high in compactness and uniformity, the bearing capacity of the hard alloy is improved, the service life of the hard alloy is prolonged, and the method is high in practicability and popularization value.

The invention discloses a method for extracting and separating paederosidic acid from Saprosma merrillii Lo. The method comprises the following concrete steps: (1) extracting the stem of Saprosma merrillii Lo by using an aqueous ethanol solution and concentrating liquid extract so as to obtain ethanol extract; (2) dispersing the ethanol extract in water, successively extracting the dispersed ethanol extract with petroleum ether and ethyl acetate of a same volume, dispersing a residual water phase part left after extraction in water, carrying out macroporous resin chromatography, then carrying out gradient elution with the aqueous ethanol solution, carrying out silica gel column chromatography on a target fraction and then carrying out gradient elution with chloroform-methanol so as to obtain a crude paederosidic acid product with a purity of no less than 50%; and (3) dissolving the crude paederosidic acid product with methanol and then carrying out gradient elution with chloroform-methanol so as to obtain a fine paederosidic acid product with a purity of no less than 90%. The method provided by the invention pioneers extraction of the active ingredient paederosidic acid from Saprosma merrillii Lo and has active significance to comprehensive utilization of the medicinal material resource of Saprosma merrillii Lo.

The invention discloses a rigid polymethacrylimide (PMI) foam integrated waveguide surface electroless copper plating method. The rigid PMI foam integrated waveguide surface electroless copper plating method is used for solving the technical field of the poor binding force of copper and a plastic substrate of an existing plastic surface electroless copper plating method. The technical scheme is that the rigid PMI foam integrated waveguide surface electroless copper plating method adopts polymethacrylimide foam of different densities as a substrate, and processing and hole conditioning, cleaning, surface roughening, activating, electroless copper plating and plating layer anti-corrosion treatment are conducted on the polymethacrylimide foam. According to the rigid PMI foam integrated waveguide surface electroless copper plating method, because the high-strength high-heat-resistance rigid PMI foam is adopted as a waveguide structure, compared with the prior art, the size and weight of antennas are reduced, and limit of shapes of the antennas do not influence on the polymethacrylimide foam; because a electroless copper plating technology is adopted, surface metallization can be conducted on waveguide structures of through holes and complicated shapes well, a plating layer is even, the plating layer does not need to be covered with a metal plate, and a gap influencing on performance does not exist; and the electroless copper plating technology adopts a one-step activation method and activating solutions using-repeatedly, waste of palladium metal is avoided, the plating layer is thick, the conductibility is good, and the binding force of the plating layer and the plastic substrate is high.