232 results about "Tannic acid" patented technology

This invention discloses a ternary composite adsorbent based on iron-catechol-boric acid, its preparation method, and its application, belonging to the field of dyeing and printing wastewater treatment. The adsorbent of this invention uses tannic acid with a surface rich in catechol groups as a substrate. A stable metal-phenolic network is formed through the coordination of trivalent iron with catechol groups, efficiently capturing anions using metal bridging and electrostatic attraction to form the adsorption core. Boric acid groups are further introduced as specific recognition units, forming specific dynamic covalent bonds with the catechol groups of anionic dyes. Compared with traditional adsorbents, the adsorbent of this invention provides ultra-high adsorption capacity and selectivity through the synergistic effect of multiple mechanisms, including electrostatic adsorption, coordination complexation, hydrogen bonding, and reversible covalent bonding of borate ester bonds. It can achieve efficient desorption of dyes and recycling of materials, and efficiently and rapidly remove anionic dyes from water.

The application discloses a high-oil-content essential oil microcapsule powder and a preparation method thereof, and belongs to the technical field of microcapsules. The preparation method comprises the following steps: preparing a gelatin water solution, preparing an acacia water solution, preparing an acacia-starch water solution, preparing a chitosan-tannic acid water solution, preparing an emulsion, primary crosslinking, and secondary crosslinking. The essential oil microcapsule powder prepared by the method has high oil content, low surface oil content, excellent slow-release performance, solubility, long-term controlled-release performance and fluidity, and uniform particle size distribution.

The application discloses a kind of based on MXene / bimetallic phosphide / multi-polyphenol polymer multilevel flame-retardant photothermal material and preparation method, the material with nanosheet as base, by in-situ construction precursor and form bimetallic cobalt-nickel phosphide structure through phosphorization reaction, subsequently introduce tannic acid and dopamine on its surface, in-situ copolymerization is formed with the characteristics of multi-polyphenol photothermal layer of imitation mussel, to construct MXene / bimetallic phosphide / multi-polyphenol layer multilevel composite structure.The prepared photothermal material described in the application has excellent flame-retardant performance and photothermal conversion performance, can promote the formation of dense carbon layer during combustion, effectively inhibit heat release, smoke generation and toxic gas release;Under light condition, it can realize efficient photo-thermal conversion, and is used for preventing and removing ice in low-temperature environment.Adding the material as flame retardant to thermoplastic polyurethane can significantly improve the limiting oxygen index of the composite material and reduce the peak heat release rate.

This invention discloses a method for preparing a chitosan antibacterial film. First, berberine aqueous solution and tannic acid aqueous solution are prepared separately. Then, the berberine aqueous solution is added dropwise to the tannic acid aqueous solution to form a mixed solution. The mixed solution is stirred and heated to obtain a suspension. The suspension is freeze-dried to obtain berberine-tannic acid nanoparticles. Next, a chitosan acetic acid aqueous solution is mixed with the berberine-tannic acid nanoparticles, and a film is formed to obtain a chitosan antibacterial film loaded with berberine-tannic acid nanoparticles. The prepared chitosan antibacterial film has low water content and swelling degree, strong ultraviolet shielding ability, high transparency, and strong inhibitory activity against Staphylococcus aureus and Salmonella typhimurium, which can better meet the needs of food preservation.

The application belongs to the technical field of lithium ion batteries, and discloses a poly-m-phenylene isophthalamide-based electrostatic spinning flame-retardant separator and application thereof. The m-phenylene isophthalamide-based electrostatic spinning separator, namely PMIA-based electrostatic spinning separator, is prepared by mixing modified PZS microspheres, PMIA and an organic solvent, and then adopting an electrostatic spinning method. The modified PZS microspheres are prepared by in-situ growth of an inorganic layer SiO2 on the surface of polyphosphazene PZS microspheres with flame-retardant properties. The polyphosphazene PZS microspheres are prepared by a polymerization reaction between tannic acid and hexachlorocyclotriphosphazene. The spinning separator prepared by the application has very excellent porosity, liquid absorption rate and ionic conductivity, and good thermal stability and flame retardancy.

The application discloses a preparation method and application of a polyacid tannic acid modified ultrafiltration membrane, and the preparation method comprises the following steps: preparing a casting solution containing a high molecular film forming material and a solvent; adding a polyoxometalate into the casting solution, uniformly mixing, and obtaining a polyacid modified casting solution; scraping and coating the polyacid modified casting solution to form a liquid membrane, pre-evaporating, immersing into a coagulation bath containing tannic acid to perform phase inversion and film forming, and obtaining the polyacid tannic acid modified ultrafiltration membrane. Through the synergistic effect of the polyacid blending regulation of the membrane pore structure and the in-situ coordination modification of the tannic acid phase separation, the simultaneous improvement of the permeation flux and the retention rate is realized, the pure water flux of the obtained ultrafiltration membrane reaches 221.37 LMH, the bovine serum albumin retention rate reaches 96.17%, and the preparation process is simple, efficient, and has a good large-scale application prospect.

This invention discloses an acid-triggered hydrogel plugging agent and its preparation method, comprising polyacrylamide, carboxylated tannic acid, and slow-release iron, wherein the mass ratio of polyacrylamide, carboxylated tannic acid, and slow-release iron is 10:0.03-0.06:0.005-0.01. This invention solves the problems of existing gel plugging agents being unable to remain stable in acidic environments for extended periods and being difficult to inject.

The application discloses a toughened composite polyurethane impact-resistant material based on dynamic covalent bond energy regulation, and belongs to the technical field of polyurethane materials. A double dynamic covalent network containing DA bonds and disulfide bonds is constructed by reacting polyurethane prepolymer, furfurylamine, cystine diethyl ester and bismaleimide, then nano molybdenum disulfide is modified by silane, then a metal-polyphenol / polymer composite interface layer is constructed on the surface of aramid fiber by tannic acid-iron complex and polyethyleneimine, finally, the components are mixed, impregnated and hot-pressed to obtain the composite polyurethane material. The application effectively dissipates impact energy through the reversible rupture and recombination of dynamic covalent bonds, and enhances the interfacial bonding force between components by using multiple interface modification, so that the material has excellent impact resistance, high strength, high ductility and efficient self-repairing function, solves the problems of easy damage of the interface of traditional composite materials, insufficient impact resistance and irreversible damage, and has wide application prospect in the fields of safety protection and buffer components.

This invention relates to the field of metal nanomaterials technology, and discloses a MgTA@MnO2 nanozyme, which uses manganese dioxide nanoparticles as the core, with a metal phenolic network coating formed by the coordination of tannic acid and magnesium ions on the surface of the manganese dioxide nanoparticles; its preparation method; and the application of the MgTA@MnO2 nanozyme in the preparation of biomaterials for bone tissue repair or regeneration. This invention is the first to propose a nanozyme with manganese dioxide nanoparticles as the core, coated with a metal phenolic network coating formed by the coordination of natural polyphenols tannic acid and magnesium ions on the surface of the MnO2 core. This provides a multifunctional integrated bioactive material that can simultaneously and synergistically address the complex pathological microenvironment of bone repair. The overall process is simple, the conditions are mild, no complex equipment is required, it has good reproducibility, and it is easy to scale up production.

This invention belongs to the technical field of filtration aids for food-grade enzyme preparation production, specifically relating to a composite filter aid comprising food-grade diatomaceous earth, food-grade expanded perlite, microcrystalline cellulose, food-grade silica powder, food-grade calcium carbonate, food-grade magnesium carbonate, hydroxypropyl methylcellulose, a diatomaceous earth porous framework compound modified with a low-adsorption sodium alginate pectin silica hydration layer for glucose oxidase, a perlite microcrystalline cellulose chitosan tannic acid-bridged gradient pore modification compound, and food-grade silica. Its preparation includes preparation of a basic mixture, preparation of a composite mixture, drying and cooling, and sieving. This invention forms a loose and stable filter cake, reduces filtration resistance, and improves the filtration speed, filtrate clarity, and enzyme activity retention rate of the glucose oxidase production solution.

This invention belongs to the field of activated carbon regeneration technology, specifically relating to a modified thermal regeneration method for waste activated carbon. This invention enhances the oxidation performance of hydrogen peroxide through complexation with tannic acid and ferric chloride, and promotes the desorption of adsorbates from the surface of waste activated carbon using ultrasound assistance. This deep oxidation desorption removes most soluble pollutants and some blockages. Further deep oxidation desorption of large-molecule organic adsorbates using ozone reduces the harmful fumes that may be generated by traditional pyrolysis. Finally, staged steam activation avoids high-temperature sintering of the activated carbon, and heat is returned to the ozone reactor via a heat exchanger to reduce reaction energy consumption. This modified thermal regeneration method for waste activated carbon uses oxidation combined with thermal regeneration to avoid secondary pollution and reduce reaction energy consumption, resulting in a lower carbon loss rate and improved quality of the regenerated activated carbon.

This invention discloses a biomimetic bundled fiber evaporator, its preparation method, and its application, belonging to the field of solar interface evaporation water treatment technology. The evaporator includes a bundled fiber core formed by binding C-shaped or Y-shaped cross-section fibers or multi-twisted cotton threads with binding straps; a tannic acid-iron ion complex or MXene superhydrophilic photothermal coating coated on its surface; a hydrophobic thin layer of polydimethylsiloxane or polymethylhydrosilane sprayed onto the upper side of the evaporator; and an insulating float for buoyancy. This invention's biomimetic bundled fiber structure, inspired by enoki mushrooms, replaces the traditional ice template method with simple physical constraints, resulting in a simple, rapid, and low-cost preparation process. This structure achieves efficient, low-resistance water transport and excellent thermal localization effects. Experiments show that the evaporator can achieve a pure water evaporation rate of 2.43~2.82 kg·m³ under one day of sunlight. ‑2 ·h ‑1 It also has excellent evaporation performance and long-term stability, and can be widely used in seawater desalination, high-salt wastewater treatment and other fields.

This invention discloses a layer-by-layer deposition modified ultrafiltration membrane with both antifouling and antibacterial properties, its preparation method, and its applications. Through layer-by-layer assembly technology, a tannic acid (TA) anion layer and a polyhexamethylene biguanide (PHMB) cation layer are alternately deposited on the surface of an ultrafiltration membrane. Under weakly alkaline conditions, electrostatic interactions, hydrogen bonding, Schiff base reactions, and Michael addition reactions are simultaneously utilized to achieve both non-covalent and covalent bonding, constructing a stable and dense integrated antibacterial-antifouling composite coating. This coating has a contact-type antibacterial structure, which can effectively kill bacteria in water and inhibit biofilm formation at the source. Simultaneously, it significantly improves the hydrophilicity of the membrane surface, reduces pollutant adsorption and deposition, and achieves synergistic enhancement of antibacterial and antifouling properties. The preparation process of this invention is mild, simple, low-cost, and environmentally friendly. The modified membrane exhibits high flux retention, excellent separation performance, and excellent operational stability, and can be widely applied in water treatment scenarios such as municipal wastewater treatment.

This invention discloses a titanium dioxide core-shell structured photocatalyst supported on metal particles. The catalyst is obtained by calcining titanium-based metal-organic framework material MIL-125(Ti) as a precursor, after introducing metal components, tannic acid, and metal coordination. Titanium oxide forms the core structure, and a carbon layer coating the surface forms the shell structure, supporting metal particles. During preparation, the preparation conditions can be optimized by controlling the concentration of metal ions, the concentration of tannic acid, and the pH of the tannic acid coordination system. This photocatalyst exhibits high catalytic activity, target product selectivity, and cycle stability in the photocatalytic oxidation conversion of biomass derivatives. It is suitable for the selective oxidation of biomass platform compounds such as 5-hydroxymethylfurfural to prepare high-value-added products. Furthermore, the preparation method is simple, the raw materials are widely available, and it is suitable for catalytic conversion applications under visible light conditions, demonstrating good application prospects and promotional value.

This invention relates to the field of bioimmobilization technology, and discloses a metal-organic framework composite material, its preparation method and application, a method for immobilizing biomolecules, and the immobilization of biomolecules. The metal-organic framework composite material comprises a metal-organic framework material and natural polyphenols modified on the surface of the metal-organic framework material; wherein the metal-organic framework material is UIO-66-NH2, and the natural polyphenols are selected from at least one of tannic acid, gallic acid, and dopamine. This metal-organic framework composite material can achieve efficient, mild, and stable immobilization of biomolecules, significantly improving the versatility, catalytic activity, and stability of immobilized biomolecules.

This invention discloses a preparation process for high-carbon ferrochrome based on plasma spheroidization technology, belonging to the field of powder metallurgy. The process involves crushing and ball milling high-carbon ferrochrome blocks to obtain pre-formed powder, adding tannic acid, urea, nickel acetate tetrahydrate, and citric acid for coating, followed by spray drying. After pre-reduction carbonization in an argon-hydrogen atmosphere, the powder is then spheroidized using a radio frequency inductively coupled plasma torch. In-situ nanostructure growth is achieved in a mixed atmosphere of argon, hydrogen, and acetylene. Nickel acetate is reduced to catalytically active elemental nickel nanoparticles under the action of hydrogen and carbon monoxide. The powder is then cooled, graded, and inertly encapsulated to obtain a high-sphericity, low-oxygen-content, high-carbon ferrochrome-based core-shell structured spherical powder. The process flow of this invention is continuous and controllable, effectively improving powder flowability, bulk density, hardness, and corrosion resistance, and is applicable to additive manufacturing, thermal spraying, and powder metallurgy forming.

This invention belongs to the field of algae preservation technology, specifically relating to a chitosan-based nano-preservative for spirulina preservation and its preparation method. The preparation method of the chitosan-based nano-preservative includes the following steps: (1) adding eugenol and zinc acetate sequentially to a tannic acid solution, mixing well, and then ultrasonically treating at 35-45℃ for 2-6 hours to obtain a nanosphere system; (2) adding the nanosphere system obtained in step (1) to a chitosan solution, then adding zinc acetate to the chitosan solution, and stirring and reacting at 25-60℃ for 8-12 hours to obtain the chitosan-based nano-preservative. This invention achieves a multi-effect combination of "antibacterial-antioxidant-slow release" through the synergistic effect of the antibacterial action of eugenol, the antioxidant / anti-inflammatory action of tannic acid, and the auxiliary antibacterial and cross-linking action of zinc acetate, thus solving the problem of the functional limitations of single preservation technology.

This invention belongs to the field of environmental remediation material preparation technology, and provides a porous structure-controlled activated carbon for formaldehyde adsorption and its preparation method. Eutectic microparticles are prepared by co-melting a potassium-containing activator with a nitrogen-containing precursor, which can achieve in-situ low-temperature micropore etching and nitrogen atom doping during heat treatment. Simultaneously, a microgel is prepared by complexing and self-assembling tannic acid and polyethyleneimine and mild cross-linking. This microgel acts as a soft template during the carbonization stage, constructing a continuous mesoporous network and providing abundant surface alkaline sites for the carbon skeleton. Furthermore, an inorganic nano-skeleton reinforcing agent is introduced during the forming stage, and the mechanical strength of the material is improved by microgelation treatment of the particle surface. During heat treatment, a microporous-mesoporous hierarchical pore structure is formed. Through acid washing purification and surface re-alkalization treatment, activated carbon particles with highly efficient formaldehyde capture and strong locking capabilities are obtained, showing broad application prospects in the field of indoor air purification.

This invention belongs to the field of biomedical materials technology, specifically disclosing a core-shell microneedle, a core-shell microneedle patch, its preparation method, and its application. Through structural design and carrier material optimization, this invention provides a core-shell microneedle with a programmed sequential release of tannic acid in the outer shell and verteporfen in the core layer, successfully matching the dynamic physiological rhythm of wound healing and ensuring effective wound repair. In vitro and in vivo biological evaluations have confirmed that the core-shell microneedle patch prepared using the core-shell microneedles of this invention possesses excellent antibacterial, antioxidant, and immune microenvironment-regulating abilities. It can effectively induce macrophage polarization towards the M2 type, specifically inhibit YAP protein expression, and significantly accelerate the closure process of infected wounds. From both upstream immune regulation and downstream fibrosis inhibition levels, it dually blocks the pathological scar formation pathway, ultimately achieving high-quality, scar-free regenerative repair of infected wounds.

A carbon dioxide mineralization process is disclosed, which includes introducing ammonium hydroxide solution and a calcium chloride solution into a reaction vessel to form a mixed solution, introducing carbon dioxide gas into the reaction vessel, and forming a calcium carbonate precipitate. Implementations of the carbon dioxide mineralization process can include where the mixed solution further may include tannic acid. A concentration of tannic acid can be from about 0 mg / mL to about 2 mg / mL. A flow rate of the introduction of carbon dioxide gas can be from about 0 L / min to about 1.0 L / min. The carbon dioxide mineralization process may include providing ultrasonic energy at a frequency of from about 20 khz to about 130 khz to the mixed solution. The carbon dioxide mineralization process may include filtering the calcium carbonate precipitate through a polyvinylidene fluoride membrane. The calcium carbonate precipitate may include a metastable vaterite phase.

The application relates to a biological glass-containing wound-care ointment, a dressing and a preparation method, which comprises the following steps: uniformly stirring betaine and tannic acid to obtain a low glass transition temperature mixture; adding biological glass into a CaCl2 solution, uniformly stirring, centrifuging, and freeze-drying to obtain a pretreatment; melting vaseline, adding the vaseline into the pretreatment, uniformly stirring, and obtaining a hybrid ointment; adding the hybrid ointment into the low glass transition temperature mixture, uniformly stirring, and vacuum degassing to obtain the biological glass-containing wound-care ointment. The application can solve the problems of poor interface compatibility between biological glass particles and a polymer matrix, easy ion burst release or no release of the biological glass in the related art.

This invention discloses Bifidobacterium microspheres for alleviating Salmonella typhimurium infection, their preparation method, and applications. It belongs to the field of microbial shell-core gel technology, and particularly relates to Bifidobacterium microspheres for alleviating Salmonella typhimurium infection. The Bifidobacterium microspheres are prepared by mixing a thermal copolymer with Bifidobacterium, then adding it dropwise to a calcium chloride aqueous solution for the first cross-linking, followed by immersion in a tannic acid aqueous solution for the second cross-linking. The thermal copolymer is obtained by mixing equal volumes of polysaccharide aqueous solution and protein aqueous solution. This invention provides Bifidobacterium microspheres for alleviating Salmonella typhimurium infection, their preparation method, and applications. The Bifidobacterium microspheres prepared by this invention achieve concentrated responsive release of Bifidobacterium in the cecum, improving intestinal retention and adhesion colonization efficiency. Their alleviating effect on Salmonella typhimurium infection exceeds that of free bacteria, exhibiting better intestinal barrier damage repair and flora regulation effects.

The application belongs to the technical field of modified activated carbon preparation, and discloses a preparation method of activated carbon for lead adsorption in high-salt environment. 2+ Still have a certain adsorption performance of activated carbon material. In the modified reagent selected in the experiment, tannic acid is a food-grade acid modifier, which presents very good safety at normal temperature, and triethanolamine is also a stabilizer commonly used in chemical experiments, which is very safe. Therefore, the raw materials used in the entire modification experiment design are safe reagents, which are safer than the commonly used modification reagents of activated carbon. The activated carbon is modified at 80 DEG C water bath environment, and the composite modification effect is best after 2wt%+2vt% composite modification. The adsorption capacity K value after modification reaches 14.724 mg / g, which has practical application value.

The application relates to the technical field of medical materials, and discloses an antibacterial coating containing a peptide-like substance and a preparation method thereof, which comprises the following steps: step 1, preparing an antibacterial solution containing a peptide-like substance; step 2, cleaning and drying the surface of a medical material; step 3, immersing the medical material treated in step 2 in the antibacterial solution in step 1 and standing, then taking out and drying the medical material, and preparing the antibacterial coating on the surface of the medical material; the antibacterial solution containing the peptide-like substance comprises the following raw material components according to 100% by mass: 0.1-2% of a peptide-like substance, 5-20% of tannic acid, 0.5-2% of hydrochloric acid, and the rest is an organic solvent; the peptide-like substance has the following structure. In the application, the peptide-like substance compound with excellent antifungal effect is used in cooperation with natural plant polyphenol tannic acid, the hydrogen bond and the pi-pi stacking between the tannic acid and the peptide-like substance are used together, a hydrophobic antibacterial coating with excellent antibacterial effect, stable adhesion and uniformity is formed on the surface of the medical material.

This invention discloses a PVDF-modified ultrafiltration membrane based on a tannic acid crosslinking network, its preparation method, and its applications. The membrane is prepared by a phase inversion membrane fabrication method using polyethyleneimine, tannic acid, polyvinylidene fluoride (PVDF), and N,N-dimethylacetamide (NDM). The pyrogallol structure abundant in the tannic acid molecule can coordinate with metal ions and also form a robust covalent crosslinking network with the amine-rich polyethyleneimine through Michael addition and Schiff base reactions. This network firmly anchors TA to the membrane surface and pores, solving the problem of TA loss in traditional modifications. The introduction of TA imparts lasting hydrophilicity to the membrane, significantly improving pure water flux and separation efficiency. Simultaneously, the hydrophilic and positively charged surface synergistically constructed by TA and PEI effectively inhibits the adsorption and deposition of pollutants, endowing the membrane with excellent antifouling performance and operational stability. This PVDF membrane, prepared through a green and simple co-crosslinking strategy, shows broad application prospects in complex water treatment and bioseparation.

The application discloses a preparation method of an electric field-induced hydrogel electrode and application thereof. The method mainly uses polyvinyl alcohol as a base material, combines conductive media (PEDOT:PSS, NaCl or CaCl), a chemical crosslinking agent (glutaraldehyde) and a reversible coordination crosslinking agent (sodium tetraborate decahydrate), and introduces tannic acid to improve adhesion. The core of the method is that the electric field-induced hydrogel is added dropwise to the surface of an electrode to be grown, a redox reaction is induced in a cathode area by applying an electric field, the pH value of a solution is rapidly increased, the coordination crosslinking of sodium tetraborate is activated, and the hydrogel is rapidly and in-situ solidified on the surface of the electrode. The hydrogel electrode prepared by the method has high tensile property, high conductivity and self-repairing characteristics, has low contact impedance and high signal-to-noise ratio, and can be used as a high-performance flexible electrode and applied to detection of electrocardiosignal and other electrophysiological signals, and has obvious advantages compared with commercial electrodes.

This invention discloses a mitochondrial-targeted nanomaterial for senescent cells and its application in anti-aging. The material is a nucleic acid aptamer-tetrahedral DNA, mainly assembled from four single-stranded DNA sequences, SEQ ID Nos. 1-4. Preparation involves first hybridizing the four single-stranded DNA sequences, then concentrating them to obtain aptamer-modified tetrahedra, which are then coupled with tannic acid (TA) via a Mann reaction in the presence of formaldehyde to obtain the Apt-tFNAs-TA complex. Finally, it is incubated with excess catechins to obtain the final delivery material, Apt-tFNAs@catechin-TA. This invention's material exhibits good biocompatibility and skin tissue compatibility, significantly improving uptake efficiency and mitochondrial localization ability in senescent cells. It can effectively deliver polyphenolic compounds such as catechins and protocatechuic acid, improving mitochondrial function and addressing the technical problems of low delivery efficiency of active ingredients and insufficient targeted enrichment in senescent cells.