311 results about "Macromolecular Substances" patented technology

The invention discloses a kind of eucommia leaf fermentation extract and its preparation method and application, and belongs to the technical field of microorganisms and feed additives. With eucommia leaf and wheat bran as substrates, by configuring a specific black aspergillus niger-trichoderma harzianum-saccharomyces cerevisiae complex bacterial liquid as a fermentation agent, a closed fermentation is carried out to make black aspergillus, trichoderma harzianum, and saccharomyces cerevisiae ferment to produce a large amount of cellulase, protease, lipase, amylase and glucosidase, etc., and then by pumping and circulating treatment, the cellulose, protein, starch, beta-glycan and other macromolecular substances in eucommia leaf are further enzymolyzed into protein oligopeptides, monosaccharides, and soluble oligosaccharides that are beneficial to livestock and poultry absorption. The eucommia leaf fermentation extract prepared by the present invention is used as a feed additive for beef cattle feeding, improves the daily weight gain and feed intake of beef cattle, and significantly reduces the feed-to-meat ratio, saves feed consumption, improves the protein content in meat, reduces the fat content, reduces energy, and improves meat quality.

The invention provides an efficient composite material manufacturing method based on front-end polymerization initiation point design, relates to manufacturing of forming materials containing macromolecular substances, and belongs to the technical field of common technological processes of processing and batching of macromolecular materials. According to the invention, the epoxy resin composite material with excellent mechanical properties is rapidly prepared with low energy consumption by preparing the epoxy resin front-end polymerization solution and initiating front-end polymerization at multiple points. The method has the advantages of being high in designability, easy to operate and the like, and rapid and energy-saving manufacturing of the epoxy resin and the composite material thereof is achieved while the mechanical property is maintained through multi-point initiation of front-end polymerization. The method has a wide application prospect in batch production of epoxy resin and composite materials and manufacturing of large-scale structures.

The invention belongs to the technical field of chromatographic packing, and particularly relates to a double-layer hole type SiO2 (at) SiO2 core-shell microsphere based on a double-phase method and a preparation method and application of the double-layer hole type SiO2 (at) SiO2 core-shell microsphere. According to the core-shell microsphere, micron-sized non-porous SiO2 serves as a core, a mesoporous SiO2 framework with pore channels perpendicular to the surface of the non-porous SiO2 core serves as a porous shell layer, the porous shell layer sequentially comprises a first ordered mesoporous shell layer and a second ordered mesoporous shell layer which are different in pore diameter from inside to outside, and the pore channels of the two shell layers are completely consistent in direction and are communicated with each other. According to the invention, a porous shell structure with dual or multiple pore size distribution is constructed on the surface of a SiO2 core, and by integrating more than two pore sizes with obvious size difference, exclusive mass transfer paths are provided for solute molecules with different sizes, exclusive mass transfer channels can be provided for small-molecular compounds and macromolecular substances at the same time, and the pore size difference is greatly reduced. Therefore, the selectivity and column efficiency of chromatographic separation are remarkably improved.

The invention discloses a gradient chelation-free radical activation synergistic eucalyptus chemithermomechanical pulp wastewater composite coagulant and a preparation method thereof, and belongs to the technical field of eucalyptus chemithermomechanical pulp wastewater treatment. Ferrous sulfate heptahydrate, aluminum hydroxide and magnesium sulfate are used as raw materials, and the water purifying agent with the viscosity of 35-45 mPa.s is prepared through gradient chelation reaction, free radical activating treatment, functional component composite reaction, pH and specific gravity regulation and control and curing treatment. By utilizing the synergistic effect of the polydimethyldiallylammonium chloride and the formaldehyde dicyandiamide resin, the electric neutralization capability on macromolecular colloidal substances in the wastewater is remarkably enhanced, and macromolecular substances which are difficult to biodegrade in the water are effectively removed; when the compound coagulant is used for treating the eucalyptus chemithermomechanical pulp wastewater, the addition amount of the compound coagulant is small, and the compound coagulant has excellent COD (Chemical Oxygen Demand) reduction and decolorization effects.

The present invention discloses a method for preparing a separation-catalysis structured ultrafiltration membrane using electrospun nanofibers as a substrate. The method uses a nanofiber membrane doped with nanoparticles prepared by electrospinning as a substrate, synthesizes an ultrafiltration membrane thereon by a non-solvent induced phase separation method, and obtains a multifunctional membrane with a separation-catalysis spatial order. The membrane successfully integrates separation and catalysis into a functionalized molecular sieve membrane, which not only maintains the original high flux and high retention of the ultrafiltration membrane, but also can select suitable nanomaterial electrospun nanofibers as a base catalytic layer according to different pollutants, thereby achieving efficient degradation of pollutants. The removal of multi-component pollutants mainly depends on the orderly arrangement of separation and catalysis. Membrane separation removes macromolecular substances such as natural organic matter that affect the advanced oxidation process before catalysis, thereby improving the degradation performance of the catalytic layer for small molecules; at the same time, the confinement effect of the spinning fiber on the catalyst effectively solves the problem of nanoparticle loss.

The invention relates to the technical field of wastewater purification, in particular to a phosphorus-containing wastewater treatment system. Comprising a pre-purification unit, a deep purification unit, a membrane concentration unit and a multi-effect evaporation unit which are sequentially connected, the pre-purification unit is used for diluting phosphorus-containing wastewater and filtering impurities; the deep purification unit is used for receiving the wastewater treated by the pre-purification unit and filtering multivalent metal cations, macromolecular substances and divalent salts in the wastewater; the membrane concentration unit is used for receiving the wastewater treated by the deep purification unit and evaporating water at low temperature under vacuum negative pressure and steam heating so as to concentrate phosphoric acid; and the multi-effect evaporation unit is used for receiving the phosphoric acid concentrated by the membrane concentration unit and further evaporating water under steam heating so as to further concentrate the phosphoric acid, so that a phosphoric acid product with the concentration reaching the selling standard is obtained. The method is simple in process and low in operation energy consumption, phosphorus-containing wastewater can be efficiently recycled, pollution to the environment is reduced, and economic benefits are improved through recycling of phosphorus resources.

The invention belongs to the technical field of chromatographic packing, and particularly relates to a double-layer stacking hole type SiO2-coated SiO2 core-shell microsphere as well as a preparation method and application thereof. The core-shell microsphere takes micron-sized non-porous SiO2 as a core and takes a SiO2 nanoparticle stacking layer as a porous shell layer, the porous shell layer sequentially comprises a first SiO2 mesoporous shell layer and a second SiO2 mesoporous shell layer from inside to outside, SiO2 nanoparticles in the first SiO2 mesoporous shell layer are stacked to form a first gap pore channel, and SiO2 nanoparticles in the second SiO2 mesoporous shell layer are stacked to form a second gap pore channel. According to the invention, a porous shell structure with dual or multiple pore size distribution is constructed on the surface of a SiO2 core, and by integrating more than two pore sizes with obvious size difference, exclusive mass transfer paths are provided for solute molecules with different sizes, exclusive mass transfer channels can be provided for small-molecular compounds and macromolecular substances at the same time, and the pore size difference is greatly reduced. Therefore, the selectivity and column efficiency of chromatographic separation are remarkably improved.

To improve the storage stability of mirabegron formulations and mitigate changes in drug release behavior dependent on storage environment humidity.SOLUTION: A pharmaceutical composition contains mirabegron and isomalt hydrate. The pharmaceutical composition may further contain a macromolecular substance forming hydrogel. The macromolecular substance forming hydrogel may be polyethylene oxide, cellulose ether, or a combination of them.SELECTED DRAWING: Figure 1

The invention relates to the technical field of cables, and discloses a flame-resistant polyethylene wire and cable and a production method thereof.The wire and cable comprises a metal conductor and a polyethylene cable material wrapping the outer side of the metal conductor, and the polyethylene cable material takes high-density polyethylene and low-density polyethylene as main raw materials; according to the preparation method, a polyethylene matrix is used as a main material, an organic-inorganic composite flame retardant and other additives are used as auxiliary materials, mixing and extrusion processes are performed, the prepared organic-inorganic composite flame retardant is palygorskite of which the surface is coated with a phosphorus-containing polymeric macromolecular substance, and the organic phosphorus-containing polymeric macromolecular substance can form a'transition 'connection structure between the palygorskite and the polyethylene matrix; the transition structure can greatly improve the compatibility between the palygorskite and a polyethylene matrix, so that a mutual uniform dispersion effect can be generated between the palygorskite and the polyethylene matrix, and further the reinforcing effect of the organic-inorganic composite flame retardant can be utilized to improve the mechanical strength and flame resistance of the polyethylene.

The invention belongs to the technical field of feed additives, and particularly provides a compound preparation for improving the digestibility of dry coconut shreds, which comprises a compound enzyme preparation, the compound enzyme preparation comprises xylanase with the enzyme activity of 0.5 million U / g to 25 million U / g, glucanase with the enzyme activity of 0.8 million U / g to 200 million U / g, mannase with the enzyme activity of 10,000 U / g to 200 million U / g, cellulase with the enzyme activity of 1.2 million U / g to 25 million U / g, pectinase with the enzyme activity of 10,000 U / g to 25 million U / g, galactosidase with the enzyme activity of 10,000 U / g to 300 million U / g and phytase with the enzyme activity of 0.8 million U / g to 200 million U / g. According to the compound preparation provided by the invention, macromolecular substances such as starch in the dry coconut shreds can be degraded into micromolecular substances which are easy to digest, so that the digestion utilization rate is greatly increased; fat is degraded, fatty acid components such as palmitic acid, oleic acid and lauric acid in the coconut shreds are released, and the effects of reducing blood pressure, promoting digestion and the like are achieved; meanwhile, the generated active substances can improve the disease resistance of animals, improve the health state of organisms, improve the nutritional value of the dried shredded coconut and increase the variety of unconventional feed raw materials.

The invention provides degradation liquid for degrading an unsaturated polyester type wind turbine blade and a degradation and recovery method, and belongs to the technical field of thermosetting resin degradation and resource utilization. The degradation liquid comprises a polar solvent, an alcohol solvent and organic alkali; wherein the mass of the alcohol solvent accounts for 1%-40% of the total mass of the polar solvent and the alcohol solvent, and the mass of the organic base accounts for 0.5%-15% of the total mass of the polar solvent and the alcohol solvent. The polar solvent, the alcohol solvent and the organic base are mixed to form the degradation liquid, the polar solvent, the alcohol solvent and the organic base cooperate with one another, the degradation rate is greatly increased, the organic base serves as a catalyst, corrosivity is low, equipment cannot be damaged, the dosage is small, the degradation liquid can be recycled, various macromolecular substances can be recycled, the degradation process is relatively mild, and the degradation efficiency is high. The performance of the recycled fibers cannot be damaged.

According to the application of the controllable delivery of the multi-membraneless compartment interlamellar substances in the cell-free system, two independent and coexisting protein enrichment phases are rapidly formed in the optimized cell-free system by utilizing the protein expression of a protein expression vector and adding histidine tag (His Tag) protein, namely, after the multi-membraneless compartment is formed, the two independent and coexisting protein enrichment phases are separated from the cell-free system, and the cell-free system can be used for controlling the delivery of the multi-membraneless compartment interlamellar substances in the cell-free system. And controllable delivery of micromolecular substances and macromolecular substances in multiple membrane-free zone chambers is carried out. The multiple membrane-free compartments constructed by the invention can controllably enrich specific active components and biochemical reactions in a cell-free system into the compartments and separate the specific active components and biochemical reactions from other complex metabolic reactions, and due to the high dynamic nature of the compartments, controllable communication between biomolecules and the external environment and among multiple compartments can be realized; further, the accuracy and controllability of metabolic reaction are greatly improved, and a solid foundation is laid for application of a cell-free system in the aspects of complex metabolic pathway exploration, multi-enzyme catalysis, drug delivery and the like.

The invention belongs to the technical field of biological pharmacy, and relates to a method for preparing tremella aurantialba polyphenol by utilizing tremella aurantialba TA58.21 fungus chassis cell fermentation, which comprises the following steps: adding a cooked soybean meal culture medium and a tremella aurantialba seed solution into a fermentation tank, introducing sterile oxygen, controlling the stirring rotating speed of the fermentation tank and the culture temperature to be 25-30 DEG C, continuously culturing for 5-8 days, and when the fermentation liquor becomes red, stopping the fermentation; when a large amount of foam is generated, closing an exhaust valve, keeping the tank pressure at 0.1 MPa, increasing the fermentation temperature to 50 DEG C, continuing to culture for 24 hours, increasing the stirring rotating speed of the fermentation tank, heating the fermentation liquor to 80-90 DEG C, keeping the temperature for 4-8 hours, stopping stirring, continuing to heat to 120 DEG C, and keeping the temperature for 30 minutes; centrifuging the fermentation liquor to remove precipitates and mycelia; collecting supernate, and pre-treating macromolecular substances and thallus fragments; collecting permeate liquid, and intercepting through a nanofiltration membrane to obtain a concentrated solution; and carrying out spray drying or freeze drying treatment on the concentrated solution to obtain a high-purity product. According to the invention, the tremella aurantialba polyphenol product with good water solubility, heat resistance, acid resistance and molecular weight of less than 10000 Da can be obtained.

The invention relates to a preparation method of a double-bacterium fermented opuntia ficus-indica fermentation extract and application of the double-bacterium fermented opuntia ficus-indica fermentation extract in cosmetics, and belongs to the technical field of cosmetics. The invention provides a preparation method of a double-bacterium fermented opuntia ficus-indica fermentation extract and application of the double-bacterium fermented opuntia ficus-indica fermentation extract to cosmetics, and the preparation method roughly comprises the following steps: preparing opuntia ficus-indica stem slurry and rice milk, mixing the slurry and the rice milk, performing double-bacterium fermentation, centrifuging, retaining residues, and finally enriching supernate. According to the invention, food-grade opuntia ficus stem and rice are used for fermentation, and aspergillus oryzae and saccharomycetes are used for combined fermentation, so that the introduction of exogenous enzyme is avoided, macromolecular substances are fully decomposed through synergistic metabolism, the release rate of micromolecular active ingredients is increased, and finally, the effects of moisturizing, oxidation resistance, wrinkle resistance and the like of the product are further improved through enrichment.

The invention relates to the technical field of microbiology and food processing, in particular to pediococcus acidilactici and application of the pediococcus acidilactici in preparation of a brain-intestinal axis regulating efficacy metagen product.The high-activity pediococcus acidilactici DY-1 is separated out from natural fermentation pickles of super-polyselenium plant cardamine violifolia for the first time; the strain can be widely applied to fermentation of high-selenium plant-based food, can significantly promote glycolysis release of selenium-containing active substances, has good acid resistance, high protease activity and high lipase activity, can fully ferment plant-based fermentation raw materials, and has high yield. Glycolysis of macromolecular substances such as protein, saccharides and fat is facilitated, accumulation of active ingredients such as essential amino acid, unsaturated fatty acid, alkaloid and phenolic substances is promoted, and the edibility and functionality of the product are improved; and the organic selenium-rich metagen product prepared by sterilizing the fermentation mixture can synergistically improve human body cognition and emotion regulation regulated by microorganism-intestinal-brain axis.

The invention provides a printing and dyeing wastewater concentration method and system, and the method comprises the steps: carrying out pretreatment on desizing wastewater, so that suspended particles and colloidal impurities in the wastewater are intercepted and adsorbed by a filtering medium; carrying out buffering and flow regulation on the pretreated wastewater, and meanwhile, carrying out heat exchange on hot condensate water generated in the printing and dyeing production process and the pretreated wastewater; raising the temperature of the wastewater to 40 DEG C or above; pressurizing the heated wastewater and then carrying out membrane separation and concentration treatment, forming dialysate by micromolecular substances and part of water, and gradually accumulating intercepted macromolecular substances to form concentrated solution; when the concentration of the concentrated solution reaches the discharge standard, pollutants are treated by adopting a chemical precipitation method and a biological treatment method, or useful substances are recycled. The wastewater concentration process flow is optimized, the wastewater is filtered, intercepted and adsorbed through multiple media, a good water inlet condition is provided for concentration treatment, modified starch and PVA in the wastewater are effectively concentrated, and the follow-up treatment volume and difficulty are reduced.

The invention discloses a steam explosion method for improving quality and value of rice straw roughage, which can destroy fiber structures in straws through steam explosion and hydrolyze cellulose, hemicellulose and hemicellulose macromolecular substances into small molecular substances. According to the method disclosed by the invention, after the pressure is maintained for 150 seconds under the pressure of 1.2 MPa, the content degradation rates of neutral detergent fiber, acid detergent fiber, acid detergent lignin, cellulose and hemicellulose are respectively 31.81%, 37.49%, 43.64%, 36.24% and 52.89%, and the content of crude protein is increased by 11.6%. The relative quality and the relative feeding value of the coarse feed of the rice straws can be obviously improved.

The invention discloses a Lactobacillus paracasei CCFM1455 strain, a polysaccharide prepared from the Lactobacillus paracasei CCFM1455 strain for promoting gastric mucosa repair and application of the Lactobacillus paracasei CCFM1455 strain in synergism with rhizoma polygonati, and belongs to the technical field of microorganisms and medicines. According to the lactobacillus paracasei CCFM1455 exopolysaccharide disclosed by the invention, by regulating an STAT3 / SOCS3 signal channel, the levels of gastric mucosal lesion markers PGE2 and TFF3 are remarkably reduced, the expression of inflammatory factors is regulated, and gastric barrier protection and inflammation relief are realized. In addition, when the strain is used for fermenting polygonatum sibiricum, double synergistic effects can be generated: (1) macromolecular substances such as polygonatum sibiricum saponin are biologically converted, and easily absorbed micromolecular active substances such as oleanolic acid and liukucoumarin are generated; (2) polygonatum polysaccharide is converted into high-activity compound polysaccharide, so that the mucous membrane repairing synergistic effect is enhanced; therefore, the lactobacillus paracasei CCFM1455 and the fermentation derivative thereof provide an innovative solution for targeted intervention of gastric mucosal lesion and modernization of traditional Chinese medicines.

The application provides a fruit peel biochar and a preparation method and application thereof in reinforcing residual sludge methanogenesis, and belongs to the technical field of solid waste resource treatment. The preparation method of the fruit peel biochar comprises the following steps: drying, carbonizing, and grinding banana peels after being cut into pieces to obtain the fruit peel biochar; the heating speed in the carbonizing process is 10-15 DEG C / min, the pyrolysis temperature in the carbonizing process is 500-600 DEG C, and the holding time under the pyrolysis temperature is 1-2 h. The fruit peel biochar has the advantages of strong alkalinity, and the residual sludge is pretreated first, the hydrolysis rate of the residual sludge is improved, the barrier of macromolecular substance dissolution is broken, more organic substrates are provided for the subsequent anaerobic digestion process, meanwhile, the biochar added in the pretreatment stage can still reinforce the effect of the anaerobic digestion in the subsequent stage, and a more competitive new idea for the application of the biochar in the anaerobic digestion is provided.

The invention provides a method for preparing beef jerky through synergistic fermentation of a mixed microbial fermentation agent and spices, and belongs to the technical field of microbial fermentation and beef food deep processing. The spices are used for pickling the beef, the flavor of the beef is improved, the mixed microbial leavening agent is added for fermentation, macromolecular substances such as protein and fat in the beef are decomposed in the growth and reproduction process of microorganisms, and substances such as micromolecular peptide, amino acid and fatty acid which are better absorbed are generated; the nutritional value, flavor and quality of the beef jerky can be remarkably improved, meanwhile, microbial fermentation acid production effectively inhibits growth of other microorganisms, and the safety of the beef jerky is improved.

The invention discloses a process for preparing a liquid fertilizer from high-purity tryptophan fermentation waste liquid, and relates to the technical field of fertilizer preparation, and the process comprises the steps of pretreatment of tryptophan fermentation liquid, concentration of the fermentation waste liquid, component optimization and stabilization treatment. The first filtering operation can remove suspended particles and macromolecular impurities in the waste liquid, the second filtering operation can remove macromolecular substances such as protein aggregates and polysaccharides in the waste liquid, meanwhile, the light transmittance of the waste liquid is improved, and the recovery rate of tryptophan is improved. A low-frequency pulse electromagnetic field is applied into the fermentation tank, so that the permeability of microbial cell membranes can be enhanced, the uptake of microorganisms to substrates and the secretion of metabolites can be promoted, the fermentation efficiency can be improved, and the fermentation time of tryptophan fermentation liquor can be shortened.

The invention discloses an antibacterial peptide concentration and purification device, and particularly relates to the technical field of concentration and purification device.The antibacterial peptide concentration and purification device comprises a sewage tank and a liquid storage tank, a filtering part is fixed to the upper side of the sewage tank, a water storage tank is fixed to one side of the liquid storage tank, a first water pump is fixed to the upper side of the liquid storage tank, and a concentration part is fixed to the upper side of the water storage tank; a purification assembly is mounted on one side of the concentration part. According to the concentration and purification device for the antibacterial peptide, broken cell sap can be tangentially filtered through the arranged filtering parts, macromolecular substances such as cell debris and lipid are prevented from being deposited on the surface of a membrane, and the multiple filtering assemblies can be backwashed, so that the cell debris attached to the surface of the membrane in the filtering assemblies is reduced, and the concentration and purification efficiency of the antibacterial peptide is improved. The problem of frequent replacement caused by blockage of the filtering membrane is avoided, meanwhile, impurities in the filtered supernatant can be less, and the influence on the product quality is reduced.

The invention relates to the technical field of coatings, and discloses an anti-corrosion thermal insulation coating and a preparation method thereof.The anti-corrosion thermal insulation coating is formed by mixing epoxy resin serving as a film forming substance and modified inorganic mineral additives, hollow glass beads and the like serving as auxiliary materials. Wherein the modified inorganic mineral additive is prepared by modifying a polymer macromolecular substance on the surface of sepiolite, and the polymer macromolecular substance can participate in the subsequent curing process of the epoxy acrylic resin, so that mutual winding and crosslinking with the epoxy acrylic resin are realized, the structural compactness of the coating is improved, and meanwhile, the coating has a good application prospect. The sepiolite is promoted to be uniformly dispersed in the coating, the permeation path of a corrosive medium is prolonged by utilizing the self-layer chain structure of the sepiolite, so that the anti-corrosion effect of the coating is enhanced, and the sepiolite and the modified inorganic mineral additive can also synergistically enhance the impact resistance of the coating.

The invention provides a high-activity pectin methylesterase mutant designed based on a diffusion model as well as preparation and application of the high-activity pectin methylesterase mutant. The amino acid sequence of the pectin methylesterase mutant PME-DS12 is shown as SEQ ID NO: 2. According to the invention, the structure of the pectin methylesterase is redesigned by utilizing an RFdiffusion generative diffusion model, and the mutant PME-DS12 of which the enzyme activity is remarkably improved is obtained by screening. Compared with wild pectin methylesterase, the enzymatic activity of the PME-DS12 is improved by about 6.3 times, and the PME-DS12 has higher industrial application value. The mutant has wide application prospects in the fields of food processing, spinning and the like. In particular, in the aspect of flavor substance generation, macromolecular substances in food are degraded by the enzyme, so that the generation of aroma lipid substances is provided, and the aroma quality of a product is improved; the method can also be used in the papermaking industry, including biological bleaching of paper pulp, reduces the use of chemical reagents, and reduces environmental pollution.

The utility model discloses an organic matter tail gas recovery treatment device, a tail gas pretreatment system comprises a spray tower, the spray tower removes macromolecular substances, mechanical impurities and heavy oil of tail gas, neutralizes and absorbs acidic components, the spray tower reduces partial temperature by spraying absorption liquid, a plurality of adsorbers are connected in parallel, and the adsorbers are connected in parallel. Primary chambers of the adsorbers are communicated with a gas outlet of the tail gas pretreatment system, interlayers of the adsorbers are filled with adsorbents, the interlayers are suitable for introducing a desorption medium, the plurality of adsorbers orderly and alternately perform adsorption work and desorption work, auxiliary chambers are suitable for discharging purified gas to the atmosphere, and the collection system collects an organic solution settled by the interlayers. Compared with the prior art, the recycling rate of tail gas materials reaches 95% or above, the materials recycled from the tail gas can be reused for production, the production cost is reduced, and emission is reduced. The air pressure and temperature detection piece, the air pump / regulating valve and the like are connected, regulated and controlled by the central controller, automatic control is achieved, operation is simple, and unattended operation can be achieved.

The invention discloses a method for obtaining high-content madecassoside from centella asiatica by using a membrane separation method, which comprises the following steps: extraction: crushing a centella asiatica raw material, and extracting by using an ethanol solution to obtain a centella asiatica extracting solution; the centella asiatica extracting solution is filtered and centrifuged, and impurities and macromolecular substances in the centella asiatica extracting solution are removed; membrane separation: carrying out ultrafiltration separation on the pretreated extracting solution through an ultrafiltration membrane, and intercepting impurities of which the molecular weight is greater than that of madecassoside, so as to obtain permeate containing madecassoside; a concentration step: concentrating the permeate through a nanofiltration membrane to obtain a concentrated solution with high content of madecassoside; and a drying step: drying the concentrated solution to obtain a solid product with high content of madecassoside. The method has the beneficial effects that impurities are effectively removed, and the purity of madecassoside is improved; the operation process is simple and easy to control, and the production cost is reduced; and high-content madecassoside can be obtained.

The invention relates to a method for editing target genes of prawn filial generations by exopalaemon carinicauda or vannabine and application of the method. Based on the gonad development and reproduction characteristics of shrimps and crabs, Cas9 RNP (a mixture formed by mixing sgRNA and Cas9 ribonucleoprotein) is directly injected into bodies of exopalaemon carinicauda or litopenaeus vannamei with developed ovaries in an intramuscular injection manner. The used sgRNA is a guide RNA (Ribonucleic Acid), namely EcIAG-gRNA or LvIAG-gRNA, which is designed on the basis of an IAG gene (EcIAG or LvIAG) of exopalaemon carinicauda or litopenaeus vannamei. Different gRNAs and Cas9 proteins are respectively mixed and then injected into an exopalaemon carinicauda or litopenaeus vannamei parent body through intramuscular injection, Cas9 RNP can enter an ovary along with blood circulation and enter an oocyte along with development of the ovary, editing of a target gene on a genome is realized, and after the edited oocyte develops into an ovum, a progeny edited mutant is formed through fertilization. The method can also be used for delivering other biological macromolecular substances to oocytes of decapod crustacean such as exopalaemon carinicauda or litopenaeus vannamei.

The invention discloses rose fermentation liquor as well as a preparation method and application thereof. According to the method, pure rose flowers are fermented by using unique maneosporium fibuligerum, and under the condition of not additionally adding a nitrogen source, a nitrogen source or a growth factor, macromolecular substances such as polysaccharide and protein which are difficult to decompose by lactic acid bacteria can be fully hydrolyzed by using a single strain, so that more rose phenol, rose flavone, vitamin C, anthocyanin and the like are released; meanwhile, the yeast is matched with the roses, so that the rose fermentation liquid is additionally endowed with an oil control effect. The method is short in fermentation time and high in process benefit, secondary high-temperature sterilization is not needed after fermentation is finished, loss of thermosensitive volatile components of the roses is avoided, the fragrance of the roses is reserved, meanwhile, the unique ester fragrance of yeast is fused, and the prepared rose fermentation liquor is richer and lasting in fragrance level and more lasting in fragrance. The rose fermentation raw material has the advantages of multiple functions, strong efficacy and low cost, and has a good application prospect in the daily chemical industry.

The invention relates to the technical field of adhesive tapes, and discloses a high-viscosity power-on viscosity-reducing adhesive tape and a preparation method thereof.The adhesive tape comprises an adhesive layer and release films attached to the two sides of the adhesive layer, the adhesive layer is prepared by adopting acrylate monomers, a carbon nano tube modification functional agent and the like as raw materials through free radical polymerization, and the release films are attached to the two sides of the adhesive layer; wherein the carbon nanotube modified functional agent is prepared by modifying a macromolecular substance with a block connection structure on the surface of a carbon nanotube, and the macromolecular substance contains an alkenyl functional group and can participate in the subsequent polymerization process of an acrylate monomer, so that the carbon nanotube is uniformly dispersed to form a continuous conductive network; compared with the prior art, the high-temperature-resistant adhesive has the advantages that the high-temperature-resistant performance of the adhesive can be improved, electrifying viscosity reduction of the adhesive is facilitated, the macromolecular substance can serve as a cross-linking agent, cohesive energy of the adhesive is improved, the adhesive performance of the adhesive can be further improved, and in addition, rigid rings and a large number of ether bonds in the structure of the macromolecular substance can effectively enhance the high-temperature-resistant performance and the adhesive performance of the adhesive.

The invention relates to the technical field of sound insulation cotton, and discloses high-strength sound insulation cotton and a preparation method thereof.The sound insulation cotton is prepared by taking polylactic acid as a base material and a diatomite modifier and the like as additives through mixing, extrusion, spinning and needling processes, the macromolecular substance can act with an active group at the tail end of a polylactic acid molecular chain in the subsequent melt extrusion process, so that organic connection between the diatomite and the polylactic acid molecular chain can be realized while the chain extension effect on polylactic acid is realized, and therefore, the interfacial compatibility between the diatomite and the polylactic acid molecular chain is greatly improved; further, the mechanical property of the polylactic acid sound insulation cotton is effectively improved, the sound insulation effect of the polylactic acid sound insulation cotton can be improved through the rich pore structure of the kieselguhr, in addition, the macromolecular substance structure contains rich nitrogen and phosphorus flame-retardant elements, and the flame-retardant property of the sound insulation cotton can be effectively improved.