1975 results about "Polyphenol" patented technology

The invention discloses a preparation method of an interface-modified flame-retardant polypropylene-based bamboo-plastic composite material. According to the method, a modification solution composed of a polyphenol component and a boron-containing component is adopted, bamboo powder is treated under the normal-temperature stirring condition, and the interface modified bamboo powder is successfully prepared. The mechanism is that polyphenol and a boron-containing component are subjected to a coordination reaction on the surface of bamboo powder, and a reversible borate dynamic covalent bond is constructed. The dynamic bond has a temperature response characteristic: reversible dissociation is realized during high-temperature processing, so that the melt viscosity of a composite system is reduced, and the processing fluidity is improved; the interface bonding force between the bamboo powder and the polypropylene matrix and the mechanical strength of the composite material are remarkably enhanced. In addition, the introduced boron element is used as an efficient flame-retardant component and promotes generation of a compact protective carbon layer during combustion, so that the flame-retardant property of the composite material is comprehensively improved.

The invention discloses a metal-doped carbon quantum dot as well as preparation and application of the metal-doped carbon quantum dot in a nano antibacterial agent, citric acid, urea and tea polyphenol are taken as precursors, metal salt is added, carbon dot synthesis and metal ion doping are synchronously completed in one step through a hydrothermal method, and the metal-doped carbon quantum dot is prepared; the surfaces of the metal-doped carbon quantum dots are negatively charged, and the metal-doped carbon quantum dots have peroxidase-like activity and catalase-like activity at the same time; the metal ions adopt any one of Fe < 3 + >, Cu < 2 + > and Ce < 3 + >; the metal-doped carbon quantum dots are in a sphere-like shape. The metal-doped carbon quantum dots prepared by the preparation method disclosed by the invention have peroxidase-like activity and catalase-like activity at the same time through precise doping of metal ions, and the two activities have a synergistic effect in an oral periodontitis microenvironment, so that a good antibacterial effect is achieved.

The invention relates to the technical field of food processing, and in particular relates to a sparrow chensinensis Kangpu tea as well as a preparation method and application thereof, the preparation method comprises the following steps: extracting sparrow chensinensis and water according to a ratio of 1: (50-100) at 70-90 DEG C for 40-60 minutes, filtering, and adding cane sugar to obtain a fermentation substrate; the preparation method comprises the following steps: preparing seed liquid, namely activating casei paracasei, phytobacterium plantarum, acetobacter pasteurianus and kluyveromyces marxianus into seed liquid, inoculating the seed liquid into a substrate according to the inoculum size of 0.5-1.5%, fermenting for 5-10 days under the conditions that the temperature is 37 DEG C and the pressure is 0.03-0.05 MPa, and sterilizing (optionally drying) to obtain the parochetus ocellatus Kangpu tea. The preparation method of the parochetus ocellatus Kangpu tea is accurate and controllable in fermentation, safe and stable; the product retains the nutrition of the raw materials, the bioavailability of polyphenol after fermentation is improved, the antioxidant activity is enhanced, the flavor is soft, caffeine is avoided, and the product is suitable for a wide range of people and can be used for preparing antioxidant functional food.

The invention relates to the field of oral cavities, and particularly discloses a lasting antibacterial type composite tooth socket for medicine carrying and a preparation method thereof.The lasting antibacterial type composite tooth socket comprises an adsorption layer and an antibacterial membrane layer, the adsorption layer is used for adsorbing oral cavity treatment liquid medicine, and the antibacterial membrane layer comprises a nano-silver antibacterial layer and a chitosan antibacterial layer; the preparation method comprises the following steps: mixing a tea polyphenol-polylactic acid composite solution, a nano-silver-carboxylation modified cellulose compound and a polyvinyl alcohol solution, and carrying out electrostatic spinning to prepare a nano-silver antibacterial fiber membrane, so as to form the nano-silver antibacterial layer; mixing chitosan with hot water, adding cinnamyl aldehyde, glycerol and boric acid, stirring to obtain a mixed solution, coating one side of the nano-silver antibacterial layer with the mixed solution, and curing to form a chitosan antibacterial layer; the adsorption layer is attached to the side, away from the chitosan antibacterial layer, of the nano-silver antibacterial layer, and then the lasting antibacterial type composite tooth socket for carrying the medicine is prepared through hot-pressing compounding. The drug-loaded composite tooth socket has the characteristic of further improving the antibacterial property and the antibacterial durability of the drug-loaded composite tooth socket.

The invention discloses a preparation method and application of a mulberry leaf extract with high stability and high activity in a protein food system, and belongs to the field of food processing and nutrition and health. The mulberry leaf extract is prepared by taking mulberry leaves as a raw material through steam explosion and ball milling pretreatment, compound enzyme directional enzymolysis, ultrasonic-assisted extraction, protein-induced sedimentation combined with ultrafiltration membrane selective impurity removal, compound stabilization treatment and drying. The obtained extract is rich in 1-deoxynojirimycin (DNJ) and mulberry leaf polysaccharide, high-polymerization-degree polyphenol is remarkably removed, and high clarity and heat stability are achieved. The DNJ retention rate gt is obtained after the milk is stored at 37 DEG C for 7 days when the milk protein is applied to a milk system; and therefore, the product prepared by the method is obviously superior to the product prepared by the prior art. The extract is pure in flavor and high in biological activity, and can be widely applied to the field of healthy foods such as dairy products and protein beverages.

The invention discloses a bacteriostatic and antiviral bamboo pulp paper-based sanitary isolation bag as well as a preparation method and application thereof, and belongs to the field of functional paper-based packaging materials. The isolation bag takes bamboo pulp fiber paper as a base material, and the surface of the isolation bag is coated with a water-based polyhydroxyalkanoate functional coating. According to the preparation method, a special polyphenol derivative-chitosan quaternary ammonium salt-nano zinc oxide organic-inorganic hybrid factor is introduced, and the problem of agglomeration of nano particles is effectively solved by utilizing the special bridging effect of polyphenol, so that high-density cation capture and oxidation inactivation sites are constructed on the surface of the coating. Compared with the prior art, the method has the advantages that the method does not need to depend on organic fluorine compounds, and the excellent waterproof and oil-proof barrier effect and the efficient inactivation of viruses can be achieved only through the extremely low coating amount. In addition, the isolation bag has unique environmental chemical responsiveness, can be efficiently dissociated under the alkaline condition to facilitate repulping recovery, can be completely biodegraded in the natural environment, and perfectly considers the requirements of biological safety protection and green environmental protection.

The invention discloses a high-oxidation-resistance long-life polyethylene cable sheath material and a preparation method thereof, and relates to the technical field of high polymer materials. Comprising the following components: high-molecular-weight high-density polyethylene, surface-modified nano-dioxide, furan-maleimide grafted polyethylene, a Schiff base dynamic cross-linking agent, tea polyphenol grafted polyethylene, a temperature-responsive oxygen-blocking microcapsule, a main antioxidant, an auxiliary antioxidant, an emergency antioxidant, a light stabilizer, a halogen-free flame retardant, a processing aid and an acid absorbent. According to the invention, the main antioxidant, the auxiliary antioxidant and the tea polyphenol grafted polyethylene form a chemically synthesized and naturally modified composite antioxidant system, the designed service life of the material is greatly prolonged, the temperature-responsive oxygen-blocking microcapsule automatically cracks to release the core material when the operating temperature of the cable is greater than or equal to 90 DEG C, a dynamic oxygen-blocking layer is formed, and the service life of the cable is prolonged. The defect that the effect of traditional physical oxygen barrier is attenuated at high temperature is overcome, and the oxygen permeability at high temperature is reduced compared with that of a single nano barrier scheme.

The application discloses a preparation method of a hydrophilic oil-water separation anti-pollution membrane and the anti-pollution membrane and application thereof, and prepares MNRs material; the MNRs material is dispersed in dimethylacetamide, is uniformly stirred, polyvinylpyrrolidone is added, and stirring is continued, and a first mixture is obtained through ultrasonic treatment; the first mixture is mixed with polyvinylidene fluoride to obtain a second mixture, and the second mixture is stirred; the treated second mixture is dip-coated on a carrier, the dip-coated carrier is treated in deionized water to obtain an ultrafiltration membrane; the ultrafiltration membrane is soaked in a tea polyphenol solution with a Tris-HCl buffer solution, and is shaken to obtain the hydrophilic oil-water separation anti-pollution membrane. The hydrophilic oil-water separation anti-pollution membrane has excellent separation efficiency and flux recovery rate for four different oil-water mixtures of kerosene, gasoline, edible oil and n-hexane. The preparation process of the oil-water separation membrane is simple, the cost is low, and the reaction condition is mild; when the oil-water separation membrane is applied to organic wastewater separation, the oil-water separation membrane has the advantages of high efficiency, good removal performance and good recycling performance.

The invention discloses a liver protection gastrodia elata polyphenol extract as well as a preparation method and application thereof, and belongs to the technical field of natural product extraction. The method aims at solving the problems that in the prior art, gastrodia elata polyphenol extraction efficiency is low, and active ingredients are prone to being damaged by heat. According to the technical scheme, the method is characterized by comprising the following steps: mixing a gastrodia elata raw material with liquid nitrogen after being subjected to freezing and unfreezing circulating pretreatment, and performing cell wall breaking treatment through a high-voltage pulsed electric field; mixing the wall-broken raw material with a buffer solution, carrying out enzymolysis by virtue of an immobilized enzyme reactor, cooling the system after enzymolysis, and carrying out ultrahigh-pressure extraction; centrifugally filtering the extracting solution, purifying through a macroporous adsorption resin column, and collecting ethanol eluent; and finally, carrying out vacuum concentration and spray drying on the eluent to obtain the gastrodia elata polyphenol extract. According to the method, the polyphenol yield is effectively improved, the activity of the components is protected, and the obtained extract can be used for preparing liver protection medicines.

The invention discloses a preparation method of a catalytic membrane for organic wastewater treatment, which comprises the following steps: dissolving polyvinylidene fluoride (PVDF), a pore-forming agent and plant polyphenol in an organic solvent, and stirring to obtain a membrane casting solution, wherein the PVDF accounts for 12-20%, the pore-forming agent accounts for 1-8%, and the plant polyphenol accounts for 1-6%; standing and defoaming the membrane casting solution, blade-coating the membrane casting solution on a support body to form a membrane, and performing phase inversion in a water bath to obtain the plant polyphenol modified PVDF membrane; and immersing the membrane in a 3-10 mmol / L metal chloride aqueous solution, and reacting at 40-80 DEG C for 6-48 hours, so that metal ions and polyphenol are coordinated and crosslinked, and a metal-polyphenol network layer is formed on the surface of the membrane and the inner walls of membrane pores, thereby obtaining the catalytic membrane. The catalytic membrane can activate peroxymonosulfate (PMS) and synergistically degrade organic pollutants in water under a differential pressure filtration working condition, active sites are anchored stably, metal precipitation is reduced, and flux and catalytic efficiency are both considered.

The invention belongs to the technical field of biological materials, and particularly relates to nano composite hydrogel as well as a preparation method and application thereof. In the preparation process of the hydrogel, preparation of gelatin hydrazide and preparation of pullulan oxidation are sequentially completed, then preparation of active component loaded PLGA nanoparticles and self-assembly coating with metal-polyphenol are completed, and finally, the metal-polyphenol coated PLGA nanoparticles are mixed with gelatin hydrazide and pullulan oxidation to form gel in situ. The hydrogel has the characteristics of injectability, self-healing, wet adhesion and the like, the metal-polyphenol layer has the effects of resisting inflammation, resisting oxidation and promoting angiogenesis and generates photo-thermal response to near infrared rays, on-demand controllable release of the drug-loaded nanoparticles is achieved, the composite hydrogel can improve the wound surface microenvironment, promote angiogenesis and inhibit inflammation and scar formation, and the drug-loaded nanoparticles can be applied to wound healing. The ointment is suitable for burns, scalds and various complex wounds.

The invention discloses a preparation method of a multifunctional cellulose-based fiber, and belongs to the technical field of multifunctional fibers.The preparation method comprises the steps that firstly, a phosphoric acid compound and a polyphenol compound are placed in a reactor to be evenly mixed and react to obtain phosphoric acid modified polyphenol, and then the phosphoric acid modified polyphenol is subjected to wet grinding to obtain the multifunctional cellulose-based fiber; then adding the phosphoric acid modified polyphenol dispersion liquid subjected to ball milling into the cellulose-based spinning solution, finally stirring, mixing and defoaming to obtain a spinning solution containing phosphoric acid modified polyphenol, and spinning and forming to obtain the multifunctional cellulose-based fiber. The phosphoric acid modified polyphenol enables the fibers to have better flame retardance, antibacterial property, ultraviolet resistance and oxidation resistance, does not influence the softness and comfort of the fibers, has better binding force with the fibers, and ensures that the finishing effect is lasting and stable. The technology has high environmental protection property and sustainability, and is suitable for production of functional textiles, sportswear and high-performance fibers.

The present invention discloses a high thermal conductivity rubber material and a preparation method thereof, and relates to the technical field of rubber production, the high thermal conductivity rubber material comprises a rubber matrix, modified carbon black, a vulcanizing agent, a composite accelerator, an anti-aging agent, zinc oxide, stearic acid, white carbon black, montmorillonite and aramid pulp according to a weight ratio of 100: (40-60): (1.5-3): (2-4): (1-3): (3-8): (1-3): (10-20): (5-15): (3-8); the modified carbon black is prepared by reacting a composite modifier solution prepared from a silane coupling agent, sodium alginate, ammonium polyacrylate, tea polyphenol, polyethyleneimine, nano aluminum oxide and deionized water with carbon black; the composite accelerant is prepared by carrying out pre-dispersion treatment on N-cyclohexyl-2-benzothiazole sulfenamide, tetramethylthiuram disulfide, a rare earth complex and nano zinc oxide. The prepared high-thermal-conductivity rubber material is good in mechanical property and thermal conductivity.

The invention belongs to the field of optical sensing technology and food component analysis, and discloses a tea polyphenol detection method and a tea polyphenol detection device based on an infrared evanescent wave absorption spectrum. Comprising the following steps that a conical infrared optical fiber sensor is provided, the conical infrared optical fiber sensor is obtained by drawing an optical fiber with the diameter of 150-1000 microns to obtain a conical infrared optical fiber, and then the end faces of the two ends of the conical infrared optical fiber sensor are polished till the end faces of the optical fiber are free of scratches, so that the two end faces of the optical fiber are flat, smooth and bright and form mirror faces; the conical infrared optical fiber sensor is packaged in the sample pool, the upper end of the sample pool is open, and a to-be-detected sample solution is injected and fully coats the optical fiber; an 850-4000 cm <-1 > infrared light source is provided, focused infrared light enters the optical fiber and is fully coupled with the optical fiber, an infrared evanescent wave absorption spectrum is collected, and qualitative and quantitative analysis is carried out on the tea polyphenol content based on the tea polyphenol characteristic peak intensity. The method for detecting the tea polyphenol has the characteristics of rapidness, high sensitivity and low detection limit.

The invention discloses a composition for regulating body weight through satiety-sugar control double channels. The composition is prepared from the following components in parts by weight: 5-25 parts of cinnamon extract, 1-20 parts of ganoderma lucidum EGCG composite powder, 10-40 parts of L-arabinose, 5-40 parts of composite fruit and vegetable fiber powder, 5-25 parts of fructus cannabis protein peptide, 1-20 parts of apple polyphenol, 1-20 parts of white kidney bean dietary fiber powder and 1-20 parts of agaricus bisporus powder. The composition is characterized in that digestion and absorption of carbohydrate are inhibited, the swelling ratio larger than or equal to 35 times is achieved through a composite fiber system, gastric emptying is remarkably prolonged, satiety hormones such as GLP-1 are adjusted, and the composition can be used as a non-alternative weight management product and is good in safety.

The invention relates to the technical field of plastic films, in particular to an antibacterial degradable film and a preparation method thereof. The problem that a traditional degradable film is poor in antibacterial property and mechanical property is solved. The film is prepared from the following raw materials: PLA, PBS, PHA, PCL, modified nanocellulose, an antibacterial agent, composite antibacterial particles and maleic anhydride grafted PLA. The preparation method comprises the following steps: preparing functional master batches from silane coupling agent modified nano-crystalline cellulose and PLA, preparing antibacterial master batches from ZIF-8 loaded tea polyphenol antibacterial agent, mesoporous silica loaded chitosan composite antibacterial particles and PBS, adding the rest of matrix resin, functional master batches, antibacterial master batches and compatilizer into an extruder step by step, and carrying out extrusion molding to obtain the composite antibacterial material. And after mixing, plasticizing and exhausting, blow-molding to form a film, thereby obtaining the antibacterial degradable film. The mechanical property is enhanced through the functional master batch, and the composite antibacterial system has synergistic interaction, so that the film has excellent antibacterial property and mechanical property on the basis of degradability.

The present invention is drawn to an adhesive or binder composition comprising, —a cationic polyelectrolyte, —an anionic polyelectrolyte, —a mineral salt selected from the group consisting of alkaline metal or alkaline earth metal halogenides, —a particulate mineral filler, —a water-soluble polyphenol comprising at least one polyhydroxylated aromatic ring structure, and —water It is also drawn to the use of such a composition as an adhesive, binder, coating or sealant in the construction industry.

The invention belongs to the technical field of preparation of probiotics, and provides a bacterial strain with anti-allergic and immunity-improving effects and application of the bacterial strain. According to the method, a three-layer physical self-assembly structure is adopted, and polysaccharide-polyphenol layer-by-layer self-assembly coating treatment, lipid insertion layer treatment and calcium ion crosslinking protection coating treatment are sequentially carried out. And mannan oligosaccharide MOS and / or galactooligosaccharide GOS are / is mixed in the chitosan layer in a ratio of 0.05-0.15% w / v, and the surface sugar ligand density reaches 4-8 [mu] g per 10 CFU. The coating is constructed under the condition that the pH value is 5.4-5.8; the thickness of the lipid layer is 20-80 nm when the pH value is 5.6-6.2; the cross-linked layer is treated at the pH of 6.0-6.5, so that the gastric acid environment is stable for 2 hours, and the gastric acid is controllably released in intestinal juice for 2-4 hours. The prepared strain has the total thickness of 220-900 nm, the outermost layer coverage rate is larger than or equal to 85%, the gastric juice survival rate is remarkably improved, the strain can be prepared into an oral preparation to be used for preventing and relieving allergic diseases, the viable count of each dose is 1 * 10 <-1 > * 10 <-1 > CFU, and the process is mild and suitable for industrial production.

The invention relates to a method for extracting and purifying lycium barbarum polyphenol by combining bacteria and enzymes. The method comprises the following steps: pretreating lycium barbarum fruits to obtain lycium barbarum powder; extracting the wolfberry powder by using a first solvent to obtain a first crude extract; fermenting the first crude extract with lactobacillus plantarum to obtain a second crude extract; performing enzymolysis on the second crude extract by using pectinase, hemicellulase and beta-glucosidase in sequence to obtain an enzymolysis extracting solution; adsorbing and purifying the enzymolysis extracting solution by using first ion exchange resin, washing and eluting to obtain a first eluent; adsorbing and purifying the first eluent by using second ion exchange resin, washing and eluting to obtain a second eluent; and concentrating and drying the second eluent to obtain wolfberry polyphenol powder. According to the method disclosed by the invention, the fermentation of lactobacillus plantarum is combined with the synergistic effect of pectinase, hemicellulase and beta-glucosidase, polysaccharide in a crude extract is decomposed, polyphenol is released and combined, the extraction rate and the purity of the polyphenol are improved, and meanwhile, a continuous purification process of macroporous resins AB-8 and D-101 is combined, so that the product quality is further improved.

The invention relates to a medicine for skin regeneration and repair and a preparation method thereof, and belongs to the technical field of biological medicine, the medicine comprises cyperus esculentus extract peptide, brooklet anemone root tremella extract, rhodomyrtus tomentosa root-suberect spatholobus stem-radix cyathulae composite extract, pomegranate peel polyphenol and the like. The cyperus esculentus extracted peptide is a product which is more than 1kDa and is obtained by performing enzymolysis on cyperus esculentus through cellulase, alpha-chymotrypsin and ficin protease in sequence and then performing purification through a G-50 sephadex column; the tremellodon gelatinosum tremella extract is a product which is less than 3kDa and is obtained by performing common enzymolysis on tremellodon gelatinosum tremella sporocarp through cellulase and bromelain; the rhodomyrtus tomentosa root-suberect spatholobus stem-radix cyathulae composite extract is a product obtained by performing gradient extraction on rhodomyrtus tomentosa root, suberect spatholobus stem and radix cyathulae through an ethanol water solution to obtain an extract, and performing polyamide resin column adsorption and LH-60 sephadex column purification in sequence. A good repairing system is constructed by multiple components, and wound repairing and healing are accelerated.

The invention discloses a method for impregnating coffee beans with fructose under the assistance of ultrasonic waves, and relates to the technical field of food processing, and the method is technically characterized by comprising the following steps: selecting Robursta coffee beans with the moisture content of 10-12%; mixing with a 5% fructose solution according to a solid-liquid ratio of 1: 4, treating for 5-20 minutes (preferably 5 minutes) under ultrasonic waves of 40 kHz and 120 W, and totally impregnating for 4 hours; performing forced air drying at 40 DEG C for 23h until the water content is 10- And baking at the temperature of 175 DEG C for 7-8 minutes. A honeycomb net structure is formed on the surface of the coffee beans through ultrasonic treatment, the total sugar content is remarkably increased to 54.65 mg / g, amino acid composition is affected, and bioactive substances such as polyphenol and flavone are increased. The score of the baked coffee beans is more than 72 (the score of the coffee beans is 74.92 after the coffee beans are subjected to ultrasonic treatment for 5 minutes) through an SCA cup test, and the coffee beans have caramel fragrance, nut fragrance and smoother mouth feel. The method is simple and convenient to operate, low in cost and capable of effectively improving the flavor quality of the Robursta coffee.

The invention relates to a preparation method of a high-dispersity metal-polyphenol nano enzyme, which comprises the following steps: dispersing a metal compound and a polyphenol compound in water, uniformly mixing and stirring to preliminarily form a dispersion liquid containing nano enzyme particles, and homogenizing; adding hydrolyzed corn starch into the homogenized dispersion liquid, and homogenizing again; and carrying out micro-jet refining treatment on the nano-enzyme dispersion liquid to finally obtain the dispersion liquid containing the high-dispersity metal-polyphenol nano-enzyme. Compared with the prior art, the prepared nano-enzyme dispersion liquid is uniform in particle size, transparent and clear, and the long-acting activity is remarkably enhanced.

The invention provides an extraction method and application of natural plant polyphenol, which mainly utilizes a polylactic acid-polyethylene glycol copolymer to prepare an extraction solution for extracting and embedding polyphenol in natural plant tissues. The preparation method comprises the following steps: (1) preparing a PLA-PEG extraction solution; (2) extracting the natural plant polyphenol to obtain the natural plant polyphenol extract; and (3) carrying out post-treatment on the natural plant polyphenol extract. The invention provides a new path for high-valued utilization of agricultural and sideline products and industrial upgrading of natural polyphenol. The stability of the polyphenol is remarkably improved and the shelf life is prolonged through copolymer embedding, long-acting bacteriostasis is achieved, and the hydrogel has good biocompatibility and wide market prospects.

The invention discloses a method for preparing a vanadium electrolyte by electrochemistry-ultrasonic synergistic reduction of a waste vanadium catalyst in the technical field of solid waste resource utilization, which comprises the following steps of: roasting the waste vanadium catalyst by NaOH and leaching by sulfuric acid, applying 80Hz pulse current by adopting a titanium-based lead dioxide anode and a graphite cathode in a three-chamber electrolytic bath, synchronously starting a 25kHz and 300W ultrasonic field for synergistic reduction, and controlling the reaction temperature to be 35 + / -2 DEG C until the V < 5 + > concentration is less than 0.05 g / L; and then adding a chitosan-tea polyphenol composite stabilizer, and concentrating through a PVDF (Polyvinylidene Fluoride) ultrafiltration membrane to obtain electrolyte with the vanadium concentration of 1.8 mol / L, wherein the molar ratio of V < 4 + > to V < 3 + > is 1: 1.2, Fe < 3 + > is less than 15 ppm, and Al < 3 + > is less than 10 ppm. In the process, the vanadium recovery rate reaches 95.2%, the energy consumption is 2.8 kWh / kg vanadium and is reduced by 65% compared with that of a traditional process, and the cycle life of the electrolyte is prolonged to 1200 times or above.

The invention discloses a protein / polyphenol composite nanofiltration membrane and application thereof, and belongs to the technical field of protein membrane separation. The nano-filtration membrane is formed by modifying an amyloid-like protein film with the thickness of 50-300 nm and the average pore size of 0.4-1 nm by polyphenol and then adhering the amyloid-like protein film to a porous base material, wherein the amyloid-like protein film is formed by unfolding and self-assembling protein under the action of a modifier. The nanofiltration membrane disclosed by the invention can realize efficient selective separation of Mg < 2 + > / Li < + > in salt lake brine with a high magnesium-lithium ratio, has selective separation capacity on mixed anions Cl <-> / SO4 < 2->, can effectively remove heavy metal ions and perfluoro / polyfluoroalkyl compounds in water, and provides an important basis for developing a sustainable and high-performance next-generation membrane separation technology.

The preparation method comprises the following steps: by taking natural chitosan, epsilon-polylysine and polyphenol as raw materials, firstly, respectively preparing polyphenol modified chitosan and carboxyphenylboronic acid modified polylysine through a carbodiimide coupling method, then, mixing single-component solutions of the polyphenol modified chitosan and the carboxyphenylboronic acid modified polylysine, and then, preparing the antibacterial and antioxidant glycopeptide hydrogel based on the polyphenol. And the antibacterial and antioxidant glycopeptide hydrogel is obtained by virtue of the synergistic effect of the phenolic hydroxyl group-boric acid group dynamic bond and the amino group-carboxyl group. The hydrogel disclosed by the invention has broad-spectrum antibacterial property and glucose response oxidation resistance, has self-healing capability and strong wound adhesion, is excellent in biocompatibility and can be naturally degraded; and the process is simple, convenient and controllable, large-scale production is easy to realize, the hydrogel can be used as a wound dressing for treating chronic difficult-to-heal wounds such as diabetes mellitus in a targeting manner, and integrated nursing of antibiosis, antioxidation, wound adhesion and self-repairing is realized.

The invention discloses an acid-neutral nano PHA paperboard reinforcing agent as well as preparation and application thereof, and belongs to the technical field of papermaking chemicals. The reinforcing agent is a bio-based nano water-based emulsion, and the core of the reinforcing agent is that a stable high-positive-charge nanoparticle interface is constructed under an acid-neutral window through the synergistic effect of polyphenol and an amine polymer. The environment-friendly wet strength agent solves the potential safety hazard of the traditional wet strength agent, and does not contain free formaldehyde and epichlorohydrin. The method has the outstanding advantages that the method is completely compatible with a modern papermaking acid-neutral process, and the defect that the similar bio-based technology needs to react under alkalinity is overcome; the adhesive is flexible to apply, can be efficiently used for wet end addition, or can be stably compounded with oxidized starch for surface sizing; the preparation method is simple, efficient and energy-saving, can realize excellent wet strength retention rate and dry strength improvement under the conditions of low addition amount and conventional industrial drying at 105 DEG C, and does not need extra high-temperature curing.

The present disclosure relates to the technical field of film material, and particularly to a polymeric polyphenol-modified polymer film, a preparation method thereof and a metallized polymer film. According to the present disclosure, corona treatment is performed to a surface of a polymer layer, so that a polar modifying liquid can uniformly coat the surface of the polymer layer, thereby forming a modification layer tightly combined with the polymer layer. Thus, the low-polarity polymer layer surface can be imparted with a durable high polarity. Consequently, the polymer layer is capable of being stably and tightly bonded to a material layer with high polarity and high surface tension, such as a metal layer, for a long period of time, effectively broadening the application scenarios for non-polar polymer substrate layers. By controlling the concentrations of the polyphenolic compound and the cross-linking agent in the modifying liquid, the modification layer formed by a cross-linking reaction can have a suitable cross-linking density and an adequate number of hydroxyl groups, thereby further effectively and stably enhancing the long-term polarity and surface tension of the polymer layer. The preparation method is simple and easy to operate, cost-effective, efficient, and easy to scale up.

The invention discloses a degradable preservative film and a preparation method thereof. The film takes nano chitosan / agarose in a ratio of 1: 1 as a matrix, contains 0.5-5wt% of PVA (Polyvinyl Alcohol), 1-4wt% of protein powder or starch, 0.2-3wt% of tea polyphenol / carvacrol, 5-20wt% of glycerol and optional 5-15wt% of polylactic acid, and is cross-linked with sodium alginate. And carrying out tape casting at 55-65 DEG C, and carrying out gradient drying at 40-50 DEG C, thereby obtaining the product. The film is compact and flexible, the breaking strength is larger than or equal to 69 MPa, the oxygen permeability is low, the inhibition zone on six germs is enlarged by 3-4 mm, 98% of natural soil is degraded 20 days later, and no toxic smoke is generated during incineration. The biodegradable film is solvent-free in preparation, can be produced by existing equipment, is lower than a traditional biodegradable film in cost, can be in direct contact with food, remarkably prolongs the fresh-keeping period of fruits and vegetables, replaces PE and PVC, and solves white pollution.

The present disclosure belongs to the technical field of microorganisms, and in particular relates to a nano-coated growth-promoting bacterial agent and a composite growth-promoting bacterial agent, preparation methods and use thereof. The nano-coated growth-promoting bacterial agent includes a growth-promoting bacterial agent and a nano-coating formed by self-assembly of a plant-derived polyphenol and a soluble multivalent metal ion on the surface of the growth-promoting bacterial agent. The key to the present disclosure is to employ the plant-derived polyphenol and the soluble multivalent metal ion to self-assemble on the surface of the growth-promoting bacterial agent to form a nano-coating. Based on the interaction of the growth-promoting bacterial agent with the phyllosphere, the leaf face adhesion performance of the growth-promoting bacterial agent is significantly enhanced, the loss rate of the growth-promoting bacterial agent under rainfall erosion is effectively reduced, and the survival rate and colonization of the growth-promoting bacterial agent in the phyllosphere are enhanced.