870 results about "Gallic acid ester" patented technology

Hydrogel comprises hydroxyapatite nanowires and a base material for forming the hydrogel, and further comprises glucose oxidase (GOx), gallic acid, magnesium ions (Mg < 2 + >) and the like, the gallic acid and the Mg < 2 + > form Mg-MOF, and the GOx is loaded on the Mg-MOF, so that the diabetes microenvironment of a bone defect part is locally adjusted, and bone defect repair is facilitated. Through verification, the sustained-release gallic acid of GOx-MOF participates in cascade reaction, GOx is removed to generate H2O2, the benefit is maximized, and the sustained-release gallic acid has good effects of controlling blood glucose, removing ROS, regulating inflammation and promoting osteogenesis and angiogenesis. The research is expected to play a role in microenvironment regulation of diabetes mellitus bone regeneration and minimally invasive treatment of bone defects.

The invention provides a metal polyphenol nanoparticle, a preparation method thereof and an application of the metal polyphenol nanoparticle in preparation of a medicine for treating acute lung injury, the metal polyphenol nanoparticle is formed by self-assembly of metal ions and polyphenol, the metal ions are selected from Mg < 2 + >, Zn < 2 + >, Mn < 2 + > or Cu < 2 + >, and the polyphenol is selected from Mg < 2 + >, Zn < 2 + >, Mn < 2 + > or Cu < 2 + >. The polyphenol is selected from epigallocatechin gallate (EGCG), caffeic acid (CA), chlorogenic acid (CGA), gallic acid (GA) and luteolin (LUT). The metal polyphenol nanoparticles are used for preparing a medicine for treating acute lung injury induced by sepsis, pneumonia, serious trauma or inhalation injury, and the medicine further comprises a pharmaceutically acceptable carrier. The metal polyphenol nanoparticles provided by the invention are simple in preparation process and high in biological safety, polyphenol and metal ions synergistically enhance the anti-inflammatory and antioxidant activity, and the metal polyphenol nanoparticles are superior to the single use of polyphenol or metal ions.

The invention belongs to the technical field of biological medicines, and particularly relates to hydrogel with photo-thermal multiple antibacterial and hemostatic functions. The multifunctional hydrogel is prepared from epsilon-polylysine (EPL), gallic acid (GA), tannic acid (TA) and ferric trichloride hexahydrate. The polyphenols are obtained through multiple mechanisms such as reaction between the polyphenols and amino groups, metal chelation, pi-pi interaction and electrostatic attraction (as shown in Figure 1). The metal ion and multiple dynamic cross-linking system hydrogel is constructed, the hydrogel with positive charges enriched on the surface can act with blood platelets with negative charges, red blood cell aggregation, blood platelet adhesion and vasoconstriction effects are promoted, and the blood coagulation efficiency is improved. The hydrogel shows excellent antibacterial performance and photo-thermal performance, can prevent infection in the inflammation stage of wound healing, can effectively accelerate wound healing, and has good biological safety.

The invention belongs to the technical field of microorganisms, and particularly relates to pseudomonas monteilii BDLZ-3 and application thereof in relieving continuous cropping obstacles of crops. The invention discloses a strain of pseudomonas monteilii BDLZ-3, the preservation number of which is CGMCC (China General Microbiological Culture Collection Center) No.34349. The pseudomonas monteilii BDLZ-3 is separated and screened from the nature for the first time, phenolic acid autotoxic substances generated in the ginseng continuous cropping obstacle process can be efficiently degraded, the degradation rate of benzoic acid can reach 95.36%, various phenolic acids such as vanillic acid, cinnamic acid, palmitic acid and gallic acid can be effectively degraded, and the degradation spectrum is wide; when the pseudomonas monteilii BDLZ-3 is applied in a field, the content of benzoic acid in soil can be effectively reduced, meanwhile, the occurrence of ginseng root diseases can be controlled to a certain extent, the prevention and treatment effect reaches 41.23%, the growth indexes such as root length and root thickness are remarkably improved, and the yield increasing effect is achieved.

The invention discloses a silk protein-MXene composite film and a preparation method thereof. The silk protein-MXene composite film sequentially comprises a conductive surface layer, a porous response layer and a supporting bottom layer from top to bottom, the invention relates to the technical field of composite films. According to the fibroin-MXene composite film and the preparation method thereof, a three-layer gradient structure is formed by the conductive surface layer, the porous response layer and the supporting bottom layer, good conductivity and electromagnetic shielding effectiveness are ensured by utilizing oriented arrangement of MXene of the conductive surface layer, gallic acid and MXene form a hydrogen bond network, and nitrogen-doped carbon quantum dots coat the surface of MXene to form a physical barrier, so that the electromagnetic shielding effect is improved, and the electromagnetic shielding effect is improved. Through double oxidation resistance of gallic acid and nitrogen-doped carbon quantum dots, a sponge body structure formed by the porous response layer is matched to endow the composite film with high-sensitivity response to external stimulation, the supporting bottom layer is crosslinked by hexamethylene diisocyanate and enhanced by nanocellulose, the tensile strength is improved, and the tensile strength of the composite film is improved. And the contradiction between the mechanical property and the conductivity of the traditional composite film is effectively solved.

The invention discloses a natural eutectic solvent enhanced konjac glucomannan film as well as a preparation method and application thereof, and belongs to the technical field of food packaging. The konjac glucomannan film enhanced by the natural deep eutectic solvent, provided by the invention, comprises konjac glucomannan, the natural deep eutectic solvent and gallic acid modified MXene nanoparticles; the mass ratio of the konjac glucomannan to the natural eutectic solvent to the gallic acid modified MXene nanoparticles is (850 to 950) to (50 to 250) to (10 to 40). Through the synergistic effect of all the components, the defects that KGM is insufficient in intrinsic mechanical strength, weak in antibacterial and antioxidant performance and poor in moisture resistance are overcome, the comprehensive performance of the film is remarkably improved, and the film can be used for cold-chain packaging of high-value fresh food and has environment friendliness and functional practicability.

The invention belongs to the field of biomedical materials, and discloses a composite hydrogel dressing and application. The composite hydrogel dressing is prepared by the following steps: blending 4-aminophenylboronic acid grafted hyaluronic acid and gallic acid grafted collagen, adjusting the pH value, carrying out a cross-linking reaction to obtain a cross-linking product, and stirring and mixing the cross-linking product with a gallic acid reduced silver nanoparticle solution. The antibacterial and self-healing composite hydrogel dressing for promoting wound repair has proper adhesion, mechanical properties and free radical scavenging ability, and excellent antibacterial property, biocompatibility and self-healing ability.

The invention provides an ultra-high molecular weight polyethylene fiber resin composite material interface regulation composition which comprises the following components in parts by weight: 100 parts of ultra-high molecular weight polyethylene fiber, 12 parts of polyethylene, 0.6 part of a compatilizer, 0.03 part of an initiator, 2.5 parts of gallic acid, 1 part of tetraethylenepentamine and 5 parts of nano silicon dioxide. The compatilizer is used for melt grafting with polyethylene, and the initiator is used for initiating melt grafting of the compatilizer and polyethylene. The invention also provides a method for carrying out interface regulation and control by adopting the interface regulation and control composition and an ultra-high molecular weight polyethylene fiber resin composite material prepared by the method. The ultra-high molecular weight polyethylene fiber resin composite material obtained by carrying out interface regulation and control treatment on the ultra-high molecular weight polyethylene fiber resin composite material interface regulation and control composition has a good interface state, excellent mechanical properties and good impact resistance.

The invention relates to the field of coatings, and discloses a biomass-based oil-resistant coating and a preparation method thereof, the coating comprises an additive solution, a paraffin solution and gallic acid; the paraffin solution is obtained by dissolving paraffin in absolute ethyl alcohol; a preparation method of the additive solution comprises the following steps: mixing chitosan powder and an acetic acid aqueous solution to prepare a chitosan solution, ultrasonically dispersing functionalized montmorillonite in deionized water to prepare a suspension, then uniformly mixing the chitosan solution and the suspension, adding modified phytic acid prepared by grafting phytic acid and ethylene glycol diglycidyl ether, and stirring to react; the functional montmorillonite is prepared by modifying modified montmorillonite with titanium dioxide and zinc oxide, then activating the modified montmorillonite with 3-aminopropyltriethoxysilane and succinic anhydride, and then carrying out a ring-opening reaction with glycidyl neodecanoate. The coating prepared by the invention has high water resistance, the Kit oil-proof grade is kept at grade 12, and the oil-proof performance of the coating is greatly improved. Meanwhile, the antibacterial performance, the tensile index and the ultraviolet aging resistance are relatively high.

The invention relates to the technical field of sewage treatment, and provides a magnetic multi-effect multi-element composite amphiphilic particle as well as a preparation method and application thereof. The particle comprises a core-shell separated magnetic Fe3O4 particle core and a shell layer, wherein the shell layer is a silicon dioxide / titanium dioxide hybrid shell layer with a fine hole structure; the outer surface of the shell layer comprises a hydrophilic part and a hydrophobic part, the hydrophilic part has an amino group, the amino group is grafted with polydopamine, and gallic acid and catechinic acid are compounded on the polydopamine; poly (diethylaminoethyl methacrylate) is grafted on the inner surface of the shell layer and the surface of the magnetic Fe3O4 particle core. The magnetic multi-effect multi-component composite amphiphilic particle provided by the invention has excellent emulsifying performance and can realize oil-water separation; meanwhile, partial hydrolyzed polyacrylamide can be selectively adsorbed, and oily sewage containing partial hydrolyzed polyacrylamide can be efficiently treated in one step.

The invention belongs to the technical field of biomedical anti-inflammatory gels, and discloses a renewable boundary lubrication natural polyphenol anti-inflammatory hydrogel and a preparation method and application thereof.The hydrogel is of a hydrophilic viscoelastic sea island structure, gallic acid grafted gelatin blended with hyaluronic acid serves as a base material, celecoxib lipidosome is entrapped in the hydrogel, and the hydrogel is prepared from natural polyphenols, an articular cavity is injected through an enzyme crosslinking technology to form gel, hyaluronic acid and lipidosome form a hydrated lubricating layer on a cartilage-gel interface, and after the interface is abraded, internal lipidosome and hyaluronic acid are exposed to supplement lubrication so as to form sustainable lubrication; the liposome responds to friction shear crushing to release celecoxib and cooperates with gallic acid at an interface to resist inflammation progress and repair cartilage, the injectable hydrogel is developed based on gallic acid, hyaluronic acid, gelatin and celecoxib liposome to treat early osteoarthritis, mechanical lubrication and inflammation resistance are combined, and the preparation method has the advantages that the preparation method is simple, the preparation cost is low, and the application prospect is wide. The problems of large-dose toxicity, short lubrication period and the like caused by independent treatment are effectively solved, and the preparation has important clinical application significance.

The invention discloses a zirconium-based MOF material and a preparation method and application thereof, in the zirconium-based MOF material, metal ions are Zr < 4 + >, an organic ligand is ellagic acid, a conditioning agent is gallic acid, and the material has an oxygen vacancy structure and a hierarchical pore structure; the preparation method comprises the following steps: (1) mixing ellagic acid, gallic acid, zirconium oxychloride octahydrate and a solvent, and carrying out solvothermal reaction; and (2) washing and drying the solid after the reaction in the step (1) to obtain the zirconium-based MOF material. According to the invention, renewable and low-cost ellagic acid and gallic acid are respectively used as an organic ligand and a conditioning agent, and an oxygen vacancy structure is constructed in a competitive coordination manner, so that more hydroxyl and unsaturated metal Zr active sites are exposed, the interaction with formaldehyde (HCHO) is enhanced, and meanwhile, the oxygen vacancy structure can be used as an oxygen vacancy catalyst. And the existence of the hierarchical pore structure can effectively promote mass transfer, so that the HCHO adsorption capacity is improved.

The invention provides a tropical fruit preservative film which is of a double-layer structure, the outer layer is a moisture-resistant antibacterial layer, and the inner layer is a water-absorbing antifogging antibacterial layer; and the water-absorbing anti-fog antibacterial layer also comprises a pH sensitive microcapsule. The outer layer is prepared from polyhydroxyalkanoate, a humidity sensitive type block copolymer and CuO / SiO2 antibacterial nano-enzyme; and the water-absorbing anti-fog antibacterial layer comprises polyhydroxyalkanoate, a humidity-sensitive block copolymer, hygroscopic zeolite, thymol, gallic acid and a pH-sensitive microcapsule. The preservative film has a certain hydrophobic effect, the humidity of a packaging microenvironment can be adjusted, breeding of putrefying bacteria can be inhibited, meanwhile, thymol and gallic acid form a slow-release antibacterial system, and tropical fruits keep good quality in the storage and transportation links through cooperation of all the components; besides, the pH sensitive microcapsules can respond to acidic substances generated by corruption in real time, help merchants to quickly sort deteriorated fruits, and provide a visual judgment basis for consumers at the same time.

The invention discloses a method for improving in-vivo and in-vitro antioxidant activity of pomegranate peel polyphenol extract through combined enzymolysis of tannase and beta-glucosidase, and relates to the technical field of food science and biology. The pomegranate peel polyphenol extract provided by the invention is obtained from pomegranate peel powder through solvent extraction. According to the present invention, tannase and beta-glucosidase are adopted to perform single or combined enzymolysis on the pomegranate peel polyphenol extract, and the determination on the in vitro antioxidant activity of the pomegranate peel polyphenol extract shows that the antioxidant activities of DPPH and ABTS after the combined enzymolysis are improved by 29.84% and 29.30% compared with the antioxidant activities of the untreated polyphenol extract; the UPLC-ESI-QTOF-MS is used for identifying and analyzing the components of the enzymatic hydrolysate, the content of macromolecular ellagic tannin is obviously reduced, and the content of micromolecular ellagic acid and gallic acid is increased. The enzymolysis polyphenol is applied to D-galactose induced oxidative stress mice, and the result shows that the oxidative damage relieving effect of the enzymolysis polyphenol on the mice is better than that of untreated polyphenol.

The invention relates to the field of biomedicine, particularly provides a copper-based nano-enzyme as well as a preparation method and application thereof, and aims to solve the problems that in the prior art, clinical treatment on primary sclerosing cholangitis (PSC) is difficult in diagnosis and lacks of effective treatment drugs. The copper-based nano-enzyme comprises a nano-enzyme carrier and a copper-based nano-enzyme, wherein the nano-enzyme carrier is a two-dimensional nanosheet formed by copper ions, gallic acid and ursodesoxycholic acid through coordinate bonds; the probe molecule is a cyanine dye molecule connected to the surface of the nano-enzyme carrier through a covalent bond; wherein the fluorescence intensity of the copper-based nano enzyme is enhanced after the action of the alkaline phosphatase. The three functions of alkaline phosphatase responsive diagnosis, nano-enzyme catalytic treatment and ursodesoxycholic acid hepatic targeting are innovatively and synergistically integrated into one nano platform, the treatment function can be executed while specific imaging diagnosis is performed on diseases, and a new strategy is provided for diagnosis and treatment of diseases such as PSC.

The invention belongs to the technical field of metabolic engineering and biological manufacturing, and particularly relates to an engineering bacterium for producing gallic acid (GA) and application of the engineering bacterium in production of gallic acid. According to the method, key metabolic nodes in the gallic acid production process are systematically regulated, for example, the hydroxylase activity is improved, the pyruvic acid flow direction is regulated, the aromatic amino acid precursor supply is improved, and the dynamic balance between the engineering bacterium growth and the gallic acid product synthesis is realized, so that the gallic acid yield and the carbon yield are remarkably improved. Experiments show that the gallic acid yield of the engineering bacteria prepared by the invention reaches 12.5 g / L in a shake flask experiment, and reaches 109.8 g / L in a 3 L fermentation tank; and the carbon yield is increased to 0.64 g / g glucose, which is the highest level reported in the current literature.

The invention discloses a bio-based antibacterial mask and a preparation method thereof, and relates to the technical field of masks. When the bio-based antibacterial mask is prepared, firstly, chitosan is grafted with gallic acid to obtain modified chitosan, secondly, magnesium-based porphyrin, 5, 15-(aminophenyl)-10, 20-phenylporphyrin and 2, 5-diaminobenzene sulfonic acid react to prepare functional polyimide, and then the functional polyimide reacts with thionyl chloride to prepare modified polyimide; finally, the modified chitosan, hyaluronic acid and gelatin are mixed and subjected to an electrostatic spinning process, a functional film is prepared, modified polyimide and ethidene diamine are mixed and spun on the functional film through the electrostatic spinning process, and the bio-based antibacterial mask is prepared. The bio-based antibacterial mask prepared by the invention has good moisture retention, antibacterial property and oxidation resistance.

The invention relates to the field of aquatic feed, and provides a low-temperature adhesive type aquatic feed particle composition and a preparation method thereof. The composition is composed of puffed soybean meal, flour, fish meal, low-temperature directed enzyme, microcrystalline cellulose, modified zein nanoparticles, a protein adhesive and a modified zein ethanol water solution. The preparation method comprises the following specific steps: reacting soybean protein isolate with cross-linking enzyme to generate a protein adhesive, reacting proanthocyanidins with gallic acid to generate gallic acylated proanthocyanidins, and carrying out multi-step treatment on zein. Experimental results show that the composition has excellent water resistance and oxidation resistance, and the growth efficiency and the survival rate of aquatic animals are remarkably improved. The preparation method is simple, the cost is low, heat-sensitive substances in the feed are not damaged, and an economical, efficient and nutrient-rich feed solution is provided for aquaculture.

The invention discloses a graphene oxide-chitosan-carboxymethyl cellulose composite aerogel and an application of the graphene oxide-chitosan-carboxymethyl cellulose composite aerogel in adsorption of amaranth. The preparation method comprises the following steps: mixing a carboxymethyl cellulose aqueous solution with a chitosan acetic acid solution, adding gallic acid, stirring until the gallic acid is completely dissolved, adding the graphene oxide dispersion liquid, and stirring until a system forms uniform and stable gel; the gel is firstly subjected to ultralow-temperature freezing and then subjected to freeze drying, and finally the graphene oxide-chitosan-carboxymethyl cellulose composite aerogel is obtained. The aerogel prepared by the method is environment-friendly and stable in pore structure, and is a composite aerogel material with high adsorption capacity and good regeneration performance on anionic dyes. The adsorption capacity of the aerogel to amaranth can reach 125 mg / g, the adsorption rate is still kept at 77% after the aerogel is recycled for 3 times, and the aerogel is suitable for efficient treatment of dye wastewater.

The invention discloses a preparation method and application of an anti-blue-light eye-protecting car window film, relates to the technical field of optical thin films, and discloses a window film which can effectively cut off harmful short-wave blue light with the wavelength range of 415-455nm. According to the invention, a multi-layer coating structure is constructed by utilizing alternate deposition of a high-refractive-index material titanium dioxide and a low-refractive-index material silicon dioxide. The optical thickness of the coating film meets the Bragg reflection condition, reflection of the wavelength of 435 nm can be enhanced, and the effect of preventing blue light is achieved. According to the invention, tannic acid is adopted to prepare silicon dioxide, and tannic acid can be used as a pore-forming agent, so that the prepared silicon dioxide has a larger surface area and can be grafted with more octadecylamine. Secondly, tannic acid and gallic acid are used for modifying silicon dioxide, tannic acid and gallic acid can cooperate with octadecylamine to conduct hydrophobic modification on silicon dioxide, and the hydrophobic performance of the car window film is enhanced.

The invention discloses a preparation method and application of a zinc gallate catalyst for synthesizing carbon dioxide-based polycarbonate, and belongs to the technical field of catalysts.The zinc gallate catalyst is prepared through the steps that zinc salt and gallic acid (3, 4, 5-trihydroxybenzoic acid) are subjected to a reaction, low-carbon-number alcohol serves as a complexing agent, and a reaction solution is obtained; the copolymer can be applied to ring-opening copolymerization of carbon dioxide and epoxide, and a third monomer even a fourth monomer can be added on the basis to carry out ternary copolymerization and quaternary copolymerization to generate aliphatic polycarbonate with a multi-element structure. The activity of the zinc gallate catalyst for catalyzing ring-opening copolymerization of carbon dioxide and epoxypropane is larger than 900 g polymer / g catalyst, the content of carbonate units is larger than 96%, the selectivity is larger than 91%, the balance of the activity and the content of the carbonate units can be met, the synthesis process is simple, the reactant cost is low, and the zinc gallate catalyst is very suitable for industrial production of carbon dioxide-based polycarbonate.

The invention discloses an antibacterial dressing based on gallic acid-copper coated gamma-polyglutamic acid and a preparation method and application thereof, and belongs to the technical field of biomedicines.The preparation method comprises the steps that gallic acid and copper chloride dihydrate are dissolved in pure water according to the mass ratio of 3: 1, and stirring is conducted to form a solution I; stirring and reacting the solution I at 40 DEG C for 24 hours, centrifuging, collecting precipitate, washing with pure water, and freeze-drying to obtain gallic acid-copper nanoparticles; the gallic acid-copper nanoparticles and gamma-polyglutamic acid powder are mixed and dissolved in pure water according to the mass ratio of 3: 20, and after freeze drying, gallic acid-copper coated gamma-polyglutamic acid hydrogel powder is obtained. The gallic acid-copper coated gamma-polyglutamic acid hydrogel powder disclosed by the invention can absorb exudate near a wound and is subjected to in-situ gelation to form a hydration layer, so that damage to newborn tissues caused by frequent dressing replacement is avoided; it is verified that the healing promoting effect of the hydrogel can be remarkably enhanced through blue light adjuvant therapy, and the healing speed of infected wounds is remarkably increased.

The application discloses a mussel-inspired multifunctional double-network crosslinked hydrogel wound dressing. A hydrogel network formed by dynamic covalent crosslinking between carboxymethyl chitosan and oxidized sodium alginate is utilized; further, a natural antioxidant, gallic acid, with a catechol structure is introduced to enhance the tightness of the hydrogel network combination and endow the hydrogel with certain adhesion and antioxidant properties; finally, a mussel adhesive fluid containing catechol and iron is imitated to have strong tissue adhesion behavior under alkaline conditions, which is suitable for dynamic wound treatment, so as to prepare a mussel-inspired multifunctional double-network crosslinked hydrogel wound dressing. In addition, catechol-Fe 3+ Metal coordination also shows strong antibacterial effect, and under the irradiation of near-infrared light, light energy can be converted into heat energy for preventing and treating wound infection, shortening wound closure time and preventing scar formation.

The invention discloses a Chinese gall leaven preparation method based on constant-temperature fermentation, and relates to the technical field of Chinese gall leaven preparation. The preparation method comprises the following steps: respectively and independently cleaning gallnut, distiller's yeast of white spirit and tea water, and removing non-medicinal parts, mildewed medicinal materials and impurities; the method comprises the following steps: uniformly mixing gallnut powder, distiller's yeast of Baijiu and tea leaves according to a mass ratio of (10-15): (0.5-1): (2-4), adjusting the moisture content to 40-45%, and spreading the mixture in a material tray; according to the method, constant-temperature fermentation equipment is introduced, so that the temperature in the fermentation process is always kept within the range of 26 + / -5 DEG C for 60-72 hours, and drying, crushing and briquetting are performed. Compared with the traditional natural fermentation process, the constant-temperature fermentation has the advantages that the tannin biotransformation efficiency is remarkably improved, the tannin content is greatly reduced, the gallic acid content is greatly improved, the curative effect is greatly improved, the sour and astringent taste of the product is remarkably improved, the fermentation time is greatly shortened, the production efficiency is improved, and the energy cost is reduced.

The invention discloses application of a reducing agent in heme peroxidase catalytic reaction, the reducing agent is selected from ascorbic acid, dehydroascorbic acid, gallic acid and pyrogallic acid, and the reducing agent has a remarkable promotion effect on oxidation reaction and hydroxylation reaction catalyzed by heme peroxidase. A new scheme is provided for improving the catalytic oxidation efficiency of the heme peroxidase, and the development and application potential is huge.

The invention discloses a preparation method and application of a repulpable gallic acid-based waterproof and oil-proof agent, and belongs to the technical field of bio-based oil-proof hydrophobic paper surface coatings. The preparation method comprises the following steps: by taking alkyl gallate and epoxy chloropropane as raw materials, preparing alkyl gallate epoxy through epoxidation reaction; and uniformly mixing the alkyl gallate epoxy resin with an acid anhydride / phenol compound to obtain the alkyl gallate epoxy resin series waterproof and oil-proof agent. The structure of the bio-based waterproof and oil-proof agent prepared by the invention contains groups such as a non-polar long alkyl chain, an epoxy group and an amino group, a compact cross-linked coating can be formed on the surface and the interior of paper, and gaps between paper cellulose are filled, so that permeation of oil, water and gas is blocked, meanwhile, the adhesive force between the coating and the paper is increased, and the waterproof and oil-proof effects are improved. The fibers are more tightly combined together; non-polar long alkyl chains and benzene ring groups in the structure can endow the paper with excellent oil-proof, hydrophobic and mechanical properties, and flexible chain segments (alkyl carbon chains) with different lengths are introduced to adjust the flexibility of the coating, so that the flexibility and tensile strength of the paper can be effectively adjusted; the coating paper can be recycled and reused in an alcoholysis mode. The raw materials are easy to obtain and renewable, paper can be re-pulped after being coated, and the paper has the potential of replacing plastic packaging and meets the performance requirements of paper packaging on specific scenes such as water resistance and oil resistance.

A method for preparing theasinensin A (TSA) by means of a low-temperature enzyme process. The method comprises using a plant polyphenol oxidase enzyme extract or polyphenol oxidase enzyme formulation as an enzyme source, using epigallocatechin gallate (EGCG) as a substrate, using as a reaction system a buffer solution having a certain pH value, and performing an enzymatic reaction at a low temperature and subsequent steps such as column chromatography, distillation and concentration, liquid phase preparation, and freeze drying, thereby synthesizing TSA in a directional enzymatic manner. The method achieves EGCG enzymatic oxidation at a low temperature and obtains dimeric TSA by means of a conversion reaction, laying a theoretical and practical basis for green, safe, efficient and large-scale industrial production and utilization of TSA.

The invention discloses a dual-network injectable hydrogel as well as a preparation method and application thereof. The hydrogel is methacrylated gelatin / oxidized hyaluronic acid loaded with metal polyphenol nano-particles, and the metal polyphenol nano-particles are copper-gallic acid nano-particles which contain quaternized chitosan coatings and are loaded with antibacterial peptide HHC36. After the hydrogel is injected into a periodontal pocket, the hydrogel can adapt to different defect shapes, and the CuGA-coated HHC36-coated QCS nanoparticles are released by responding to a periodontitis microenvironment, so that the effects of resisting periodontal pathogenic bacteria, removing local excessive ROS (reactive oxygen species), effectively promoting fibroblast proliferation, collagen deposition, extracellular matrix accumulation and angiogenesis and further promoting periodontal bone regeneration are achieved. The preparation process is simple, the injectable hydrogel is low in price and easy to obtain, the injectable hydrogel can be prepared through simple steps, and a new thought is provided for treatment of periodontitis.

The invention provides a preparation method and application of an anoectochilus formosanus extract, belongs to the technical field of traditional Chinese medicines, and greatly improves the use effect of the anoectochilus formosanus extract by limiting compounding of anoectochilus formosanus polypeptide and thick paste. Polypeptides are mildly extracted through enzymolysis, key thermosensitive substances such as quercetin and gallic acid are prevented from being decomposed through technologies such as liquid nitrogen quick freezing and wall breaking, three solvents with different polarities are adopted, the pH and temperature of extraction are limited, directional separation of ingredients with different polarities such as flavone, polyphenol, polysaccharide and amino acid is achieved, and the extraction efficiency and the use effect are greatly improved. According to the invention, the core problems of loss of active ingredients, single effect and the like in the traditional anoectochilus formosanus extraction process are well solved, and the effects of moisturizing, relieving, oxidation resistance, tightening, wrinkle resistance and the like of the anoectochilus formosanus extract are enhanced.

The invention belongs to the technical field of cigarette filtration, and relates to a preparation method and application of a biomass-based supramolecular assembly functional material. According to the method, a large number of plant-based fibers existing in the nature serve as a substrate material, gallic acid and ellagic acid with small molecular sizes are adopted to be matched with tannic acid with large molecular sizes to be coordinated with metal ions, tannic acid molecules can be separated, crowding of the tannic acid molecules is relieved, the utilization rate of hydroxyl on the tannic acid molecules is increased, and the yield of the tannic acid is increased. The molecular assembly efficiency is improved. A metal-polyphenol network functional film is generated on the surface of the plant-based fiber material based on the polyphenol regulated supramolecular assembly structure, and the prepared material can effectively remove tar substances, especially polycyclic aromatic hydrocarbon strong cancerogenic substances, in cigarette smoke, so that harmful ingredients inhaled by smokers are reduced, meanwhile, the smoking experience feeling is not affected, and the cigarette quality is improved. The palatability of the filter tip is improved, and the filter tip has better application value and market prospect in the technical field of cigarette filtration.