39 results about "Beta-Cyclodextrins" patented technology

The invention relates to an anti-aging composition, a skin care product and a preparation method of the anti-aging composition and the skin care product. The anti-aging composition is prepared from the following components in parts by weight: 0.05 to 0.20 part of collagen, 0.05 to 0.20 part of elastin, 0.10 to 3.00 parts of water lily flower extract, 0.50 to 2.20 parts of folium mori extract, 0.50 to 2.40 parts of rhizoma dioscoreae extract and 1 to 10 parts of beta cyclodextrin. Compared with the prior art, the water lily extract, the mulberry leaf extract and even elastin have the capability of scavenging free radicals, and the Chinese yam extract has the capability of activating human body to synthesize collagen, so that the anti-aging effect is very remarkable through the synergistic interaction of the water lily extract, the mulberry leaf extract and even elastin; external supplement of collagen is matched with an internal synthesis effect, so that the collagen accumulation speed in the skin is greatly increased, the number of wrinkles is effectively reduced, and the anti-aging effect is improved.

The invention belongs to the technical field of external diagnosis devices, and particularly relates to a memristor for adenovirus concentration detection and a preparation method of the memristor. The memristor comprises a bottom electrode layer, a metal oxide layer, a functional layer and an upper electrode layer which are sequentially formed from bottom to top in the thickness direction, the bottom electrode layer is an FTO conductive glass layer, the metal oxide layer is tantalum pentoxide, the functional layer is a gelatin-beta cyclodextrin composite film, and the upper electrode layer is a conductive electrode layer. The gelatin-beta cyclodextrin composite film with the memristive effect serves as a functional layer, after the film makes contact with adenoviruses, the film adsorbs virus particles, then the unique resistance change characteristic of the memristor is caused, the memristive behavior of the memristor is further fed back, and the memristive effect of the memristor is improved. The method is used for recording and analyzing the electrochemical or bio-electricity signal characteristics of adenovirus solutions with different concentrations, the adenovirus solutions with different concentrations are effectively distinguished according to the electric signal difference of the adenovirus solution and the control solution, the effect is obvious, and the repeatability is good.

The solid beverage is prepared from deep sea fish oil, sesame oil, walnut oil, N-acetylneuraminic acid, radix astragali, radix codonopsis, rhizoma polygonati, fructus alpiniae oxyphyllae, rhizoma dioscoreae, poria cocos, fructus corni, fructus lycii, herba menthae, beta cyclodextrin and white granulated sugar, and the solid beverage is prepared by blending, potting, packaging and inspecting. And the solid beverage with the effects of protecting heart and blood vessels, strengthening brain and improving intelligence is obtained. The deep sea fish oil, the sesame oil, the radix astragali, the radix codonopsis and the rhizoma polygonati are powder prepared after spray drying. According to the solid beverage capable of protecting the heart and blood vessels, strengthening the brain and improving intelligence and the preparation technology and device, the effects of protecting the heart and blood vessels, strengthening the brain and improving intelligence can be achieved at the same time, and the product adopts medicinal and edible raw materials and is scientific in compatibility, safe and effective; a set of device is also designed in the scheme, so that the mixing uniformity and sufficiency of the powdery beverage are ensured, the mixing time is shortened, and the production efficiency is improved.

The invention discloses a carbon-coated copper catalyst as well as a preparation method and application thereof, and relates to the technical field of catalysts. According to the technical scheme, beta cyclodextrin is used as a carbon source, so that active component copper-containing particles are uniformly distributed on a carbon coating layer; wherein a carbon coating layer derived after cyclodextrin pyrolysis can effectively inhibit migration and agglomeration of copper active sites, so that the catalyst has relatively high selectivity and relatively good reaction activity, and the catalytic performance of the catalyst is promoted to be improved; the carbon-coated copper catalyst is suitable for catalyzing an ethanol water phase reforming hydrogen production reaction, the hydrogen production rate reaches 35.6 [mu] mol H2 / gcat / s, the hydrogen selectivity is higher than 99.9%, and long-time continuous and stable operation of ethanol water phase reforming hydrogen production can be ensured.

The invention relates to the technical field of analysis and test technologies and medical methods, and discloses a reagent and a method for molecular structure analysis of an estrogen isomer, which are based on cyclodextrin and are used for molecular structure analysis of an alpha / beta-E2 / E3 isomer. The reagent comprises gamma cyclodextrin (gamma-CD), beta-CD and a mixed aqueous solution of compounds containing different metal ion ligands, the molecular formula of the beta-CD is C42H70O35, the molecular weight of the beta-CD is 1134.98, and the compound containing the metal ions is salt of any metal ion or soluble alkali containing the metal ions. According to the method, an alpha / beta-E2 / E3 sample, CD, a compound containing metal ions, such as monovalent metal or divalent metal ions and the like are simply prepared into a mixed solution, then non-covalent compound ions of alpha / beta-E2 / E3-gamma-CD / beta-CD-containing metal ions are generated by utilizing electrospray ionization, and then the ion mobility spectrometry of the non-covalent compound ions is measured by utilizing an ion mobility spectrometry technology. And different position structure information of alpha / beta-E2 / E3 molecules can be obtained.

The present application provides a milbemycin oxime praziquantel-based parasitic expelling drug, which comprises the following components in parts by mass: modified milbemycin oxime 10-30 parts, nano-coated praziquantel 20-50 parts, compound synergist 5-15 parts, flavoring agent 3-8 parts, and disintegrating agent 2-5 parts. The application of the milbemycin oxime praziquantel-based parasitic expelling drug is used for preparing a preparation for preventing or treating mixed parasitic infection of dogs and cats, wherein the parasites include tapeworms, nematodes, trematodes and Demodex. Through the integrated innovation of chemical modification (succinylated milbemycin oxime), nanotechnology (HPMC-coated praziquantel) and compound synergy (non-ban Tai'er-beta cyclodextrin), the comprehensive advantages of broad-spectrum parasitic expelling, long-acting stability, safety and low toxicity are realized, and the pain points such as poor palatability, high metabolic burden and weak environmental adaptability in the prior art are solved, and the application is suitable for the prevention and treatment of mixed parasitic infection of dogs and cats.

The invention relates to the technical field of food processing, in particular to a functional oligosaccharide-containing glycolipid double-control composite tablet candy, which is prepared from the following raw materials: functional oligosaccharide, a lipid control component, a sweet base, microcrystalline cellulose, magnesium stearate, monoglyceride and beta cyclodextrin, the functional oligosaccharide is selected from one or more of fructo-oligosaccharide, isomaltooligosaccharide and galactooligosaccharide; the fat control component is selected from one or more of phytosterol ester and conjugated linoleic acid glyceride; the sweet base material comprises maltitol and isomaltulose; the raw materials can also comprise a mulberry leaf extract. According to the invention, a compound system of the functional oligosaccharide, the special fat control component and the auxiliary sugar control component is adopted, and all the components form a synergistic effect, so that not only can the glycemic index be effectively reduced, but also the fat absorption can be obviously inhibited, the double control of the sugar and the fat in a real sense is realized, and compared with the existing single-function product, the efficacy is more comprehensive and more obvious.

The present invention relates to the field of new energy technology, discloses a kind of anode oxygen evolution catalyst and its preparation method and application of PEM water electrolysis hydrogen production, including steps: step 1, mixing a solution of platinum salt or palladium salt with a solution of iridium trichloride, adding ethylenediamine iridium organic skeleton, mixing under inert atmosphere, suction filtration, washing, drying to obtain a precursor solid; step 2, reacting the precursor solid at 100-200 DEG C under inert atmosphere to obtain the anode oxygen evolution catalyst; wherein the ethylenediamine iridium organic skeleton is prepared by mixing single (6-ethylenediamine-6-deoxy) beta cyclodextrin and iridium halide. In the present invention, the catalyst containing platinum or palladium prepared by preparing ethylenediamine iridium organic skeleton using single (6-ethylenediamine-6-deoxy) beta cyclodextrin as raw material can effectively improve the oxidation reaction speed on the prototype, increase the active sites on the catalyst surface, inhibit the deactivation of the catalyst, and is used for catalytic water electrolysis hydrogen production, with efficient and stable catalytic effect.

The invention belongs to the technical field of pharmaceutical preparations, and particularly relates to a 4-aminopyridine sustained release preparation and a preparation method thereof. The sustained release preparation comprises 4-aminopyridine, ethyl-beta cyclodextrin-calcium carbonate microspheres, a filler, an adhesive, a disintegrating agent and a lubricant. According to the sustained-release preparation, the sustained-release time can be prolonged, the medicine taking frequency is reduced, the content uniformity of the preparation is improved, meanwhile, the preparation process is improved, and stimulation to operators, environment control in a production workshop and equipment cost are reduced.

Tetrodoxine conjugate and its preparation method and application. A synthetic carboxyl-containing polymer compound and tetrodoxine are used as raw materials, a catalyst and a solvent are added, and a tetrodoxine conjugate is obtained through a coupling reaction. The carboxyl-containing polymer compound is selected from carboxylated dextran or carboxylated β-cyclodextrin. The tetrodoxine conjugate can be used to prepare sodium channel blockers and drugs for treating neuropathic pain caused by chemotherapy. The tetrodoxine conjugate of the present invention has analgesic efficacy associated with TTX, and the drug window is enlarged, and the safety of medication is greatly improved.

The invention discloses a method for raising sheep in alpine regions and a special feed thereof. The invention relates to a diatom-source antifreeze protein peptide-III-microencapsulated calcium palmitate-containing compound preparation, which specifically comprises the following components in parts by mass: 100 to 130 parts of microencapsulated calcium palmitate, 6 to 10 parts of diatom-source antifreeze protein peptide AFP-III, 0.01 to 0.1 part of CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats) edited lactobacillus plantarum LP-7, 1 to 2 parts of selenium-loaded mesoporous hydroxyapatite, 1 to 1.5 parts of dimercaptosuccinic acid, 0.1 to 0.3 part of resveratrol-beta cyclodextrin inclusion compound, and 500 to 600 parts of highland barley straw. The invention relates to the technical field of feeds, in particular to a cold-resistant feed additive which comprises, by mass, 1-1.5 parts of complex microbial inoculants, 50-100 parts of cold-resistant composite extracts and 20-40 parts of rare earth modified bentonite. According to the breeding method and the special feed for the sheep in the alpine region, highland barley straw is fermented by adopting an aspergillus niger and xylanase complex microbial inoculant in stages, so that the degradation rate of lignin is greater than or equal to 76%, the lignocellulose structure of the straw is greatly damaged, and fermentable carbohydrates are exposed; the palatability and the feed intake of the coarse feed are improved.

The application provides a polyethylene glycolized recombinant canine human uricase injection preparation and a preparation method thereof. The injection preparation is composed of polyethylene glycolized recombinant canine human uricase, a beta cyclodextrin derivative, a buffer and an osmotic pressure regulator. The preparation method comprises the steps of solution preparation, sterilization, canning, plug pressing and the like. The polyethylene glycolized recombinant canine human uricase injection of the application has high purity, few impurities and little PEG residue, avoids the problem of increased drug immunogenicity after PEG shedding, and has high stability; compared with a freeze-drying preparation, the production process is simple, the production cycle is short, the freeze-drying process is not needed, and the energy consumption is low.

The utility model discloses a glucosyl stevioside production device, and relates to the technical field of glucosyl stevioside production, an inlet of a conversion tank is communicated with a raw material tank, a cyclodextrin tank, a beta cyclodextrin transferase tank and a first alkali liquor tank, and an outlet of the conversion tank is communicated with a reaction tank; an inlet of the reaction tank is respectively communicated with a sucrose tank, a sucrose synthase tank, a uridine diphosphate tank, a UGT glycosyltransferase tank and a second alkali liquor tank through pipelines, an outlet of the reaction tank is communicated with a cation exchange resin column, an inlet of the cation exchange resin column is communicated with an ethanol tank, an outlet of the cation exchange resin column is communicated with a concentration tank, and the concentration tank is communicated with a second alkali liquor tank. An outlet of the concentration tank is communicated with a dryer, and an outlet of the dryer is communicated with a glucosyl stevioside tank. The residue of unreacted glucoside in the glucosyl stevioside is reduced through a double-enzyme method, the conversion rate of a substrate is improved, the residue of the substrate is further reduced, and the taste of the product is integrally improved.

Inclusion complex comprising an active pharmaceutical ingredient which is a P2X7 inhibitor receptor antagonist (e.g. lidocaine hydrochloride, articaine) and a cyclodextrin (e.g. HP beta cyclodextrin) for use in the treatment of an autoimmune disease or a condition in which an immune response caused by a disease or infection causes hyperinflammation (e.g. Long COVID) wherein the inclusion complex is presented for administration to the lymphoid system. A base (e.g. sodium bicarbonate) may be further included in the inclusion complex. Inclusion complex may be administered intra- or sub-dermal or subcutaneously, e.g. by infusion pump or pen injector. Also claimed is a formulation comprising an inclusion complex, said complex comprising lidocaine.HCl or articaine.HCl, hydroxypropylated β-CD, a pH modifier and water wherein the pH is 5-7.4 and the ratio and concentration of components is further limited. Said formulation may have a shelf life of at least 32 weeks based on accelerated testing at 60 °C.

The application relates to a preparation method of a networked amidoxime beta cyclodextrin adsorbent, which comprises the following steps: first, carrying out a first step reaction of beta-cyclodextrin and epichlorohydrin; then, adding acrylonitrile to carry out a second step reaction under a nitrogen atmosphere to obtain a networked beta-cyclodextrin acrylonitrile polymer; and finally, carrying out a third step reaction of the networked beta-cyclodextrin acrylonitrile polymer and hydroxylamine hydrochloride to obtain a networked beta-cyclodextrin amidoxime polymer. The synthesis steps are simple, water is used as a reaction medium (avoiding the use of a large amount of organic solvents), and the environment is good; the prepared adsorbent has excellent selectivity for gallium in Bayer mother liquor; the adsorption capacity of the adsorbent for gallium ions reaches 41.6 mg / g or more, and the saturated adsorption time is extremely short, which is 6 minutes; the adsorbent has excellent adsorption kinetics; in addition, the adsorbent has a stable structure, the adsorbent can be made into a liquid filter paper, has a long service life in the Bayer mother liquor, and the adsorption capacity retention rate is not less than 90% after 5 adsorption-desorption cycles.

The invention provides ChS-betaCD as well as a preparation method and application thereof, and particularly provides application of a preparation in preparation of a medicine, the medicine is used for preventing and / or treating tumors caused by STING protein function defects, and the preparation comprises a beta cyclodextrin-chondroitin sulfate conjugate. The formulations further comprise a STING agonist, such as cGAMP. The preparation provided by the invention has organelle targeting and intracellular cholesterol distribution regulation ability, promotes STING transport and activation, induces immune response and generates lasting immune memory, and plays an anti-tumor effect. Meanwhile, the preparation provided by the invention can effectively reduce the cytotoxicity of beta-cyclodextrin, and has a good application prospect.

The invention discloses a multifunctional gamma-PGA carrier material as well as a preparation method and application thereof, and belongs to the technical field of biological carrier materials. Comprising the following steps: S1, taking a proper amount of beta cyclodextrin and paratoluensulfonyl chloride, dissolving the beta cyclodextrin and the paratoluensulfonyl chloride in a NaOH solution, violently stirring under the reaction condition of 0 DEG C, and performing post-treatment to obtain beta-CD-TS; s2, adding the compound beta-CD-TS obtained in the step S1 into a proper amount of ethidene diamine for reaction, and performing post-treatment to obtain a compound beta-CD-NH2; and S3, activating the beta-CD-NH2 obtained in the step S2, 3-aminophenylboronic acid and 4-dimethylaminopyridine (DMAP) in a reaction bottle by using an N, N-dimethylformamide (DMF) solution, simultaneously taking a proper amount of gamma-PGA and a proper amount of dicyclohexylcarbodiimide (DCC00) in the reaction bottle, activating by using DMF as a solvent, and merging liquids to continue the reaction to obtain a product. The gamma-PGA molecular structure prepared by the invention has high drug loading rate and good physicochemical properties, and can be used in the aspects of drug sustained release, wound tissue repair, biological adhesion, hemostatic, enzyme packaging and the like.

The invention discloses a slow-release essential oil natural preservative, which comprises plant essential oil, beta-cyclodextrin, starch and an activator, the plant essential oil is a core material, the beta-cyclodextrin is a wall material, the plant essential oil is one or two of mustard essential oil, garlic essential oil, cumin essential oil and mint essential oil, and the combination ratio is 1: 0-3. The starch is activated by using the principle of electron beam irradiation of free radicals, and is used for a beta cyclodextrin-essential oil embedding system, so that the subsequent irradiation grafting link and the water washing and alcohol washing link in an acrylamide system are omitted, and the process is simpler and more efficient.

The invention discloses a preparation method of compound essential oil, and relates to the technical field of fine chemical engineering, the preparation method comprises the following steps: uniformly mixing base oil, a plant extract and an antioxidant to obtain a core material, the antioxidant being a composite system of resveratrol and vitamin E; preparing a composite wall material from chitosan and beta cyclodextrin, mixing the composite wall material with the core material, carrying out high-pressure microjet treatment, and adding sodium tripolyphosphate to crosslink and solidify the microcapsule wall, so as to obtain a microcapsule suspension; mixing the microcapsule suspension with EDTA-disodium and hyaluronic acid, and then cooling to 20-30 DEG C by adopting a gradient cooling method to obtain a microcapsule concentrated solution; and compounding the micro-capsule concentrated solution, grape seed oil and a preservative, filtering through a 0.20-0.25 mu m microporous membrane, and then filling nitrogen and packaging.

A composition includes water; a eutectic solvent; and unmodified beta cyclodextrin. A method of making a composition includes combining a hydrogen bond acceptor, a hydrogen bond donor, and unmodified beta cyclodextrin to form a eutectic solvent, wherein the hydrogen bond acceptor comprises a monosaccharide, a disaccharide, or a sugar alcohol; and adding the eutectic solvent to water and a perfume, forming the composition.

The invention relates to the technical field of cyclodextrin detection, and discloses a method for detecting cyclodextrin in fermented grains based on a UHPLC-CAD (Ultra High Performance Liquid Chromatography-Computer Aided Design) technology, which comprises the following steps of: optimizing chromatographic column selection and detection parameters of a high performance liquid chromatograph and detection parameters of an electric fog type detector by adopting an ultra high performance liquid chromatograph and electric fog type detector combined system; in cooperation with pretreatment of a sample in the fermented grains, qualitative and quantitative detection of alpha cyclodextrin, beta cyclodextrin and gamma cyclodextrin in the fermented grains at the same time is successfully realized; the separation effect is excellent, interference is small, the detection speed is high, and the internal relation between the starch content, the dextrin content and the gelatinization degree in the fermented grains can be deeply excavated.

The application provides a eugenol-based tobacco bud inhibitor preparation and a compounding reduction-increase efficiency method thereof, and belongs to the technical field of tobacco bud inhibitor preparation. The specific process comprises the following steps: first, forming a clathrate of the eugenol mixture and beta cyclodextrin to realize molecular level protection; then, mixing the clathrate with gelatin and arabic gum to prepare an aqueous solution, adding chitosan to form a stable emulsion, and precisely controlling the particle size by using microemulsion technology; then, adding ultraviolet absorbers and antioxidants to enhance the environmental stability, and preparing core-shell structure microcapsules by optimizing the parameters of the spray drying method; finally, mixing the microcapsules with corn starch and dispersants to form the final slow-release product, thereby successfully solving the technical problems of poor stability, large volatile loss and limited application of the eugenol mixture used for tobacco bud inhibitor, and reducing the use of chemical bud inhibitor 2-chloro-3, 3- dimethyl-1-propene.

A composition includes water; a eutectic solvent; and unmodified beta cyclodextrin. A method of making a composition includes combining a hydrogen bond acceptor, a hydrogen bond donor, and unmodified beta cyclodextrin to form a eutectic solvent, wherein the hydrogen bond acceptor comprises a monosaccharide, a disaccharide, or a sugar alcohol; and adding the eutectic solvent to water and a perfume, forming the composition.

The present application relates to the technical field of dressings, in particular to a composite dressing patch based on glucomannan and a preparation method thereof. First, glucomannan is compounded with alpha cellulose, so that the structural functional group -OH on the alpha cellulose chain and the hydrogen bond network formed by the glucomannan in water act, the functional group -OH extends outward along the cellulose molecular structure, thereby realizing that the cellulose molecules are inserted in the glucomannan network structure, and the mechanical strength of the glucomannan hydrogel is enhanced. Secondly, amino beta cyclodextrin treated by amino functionalization is selected and grafted to the functional group -OH of the glucomannan and alpha cellulose through citric acid. Finally, the drug curcumin is dispersed in the mixed solution. Since the beta-cyclodextrin has a hydrophobic cavity, it can load the hydrophobic curcumin through host-guest interaction, thereby preparing a dressing patch with good sustained release effect and moisturizing effect.

The invention belongs to the technical field of biomass carbon materials, and discloses a bamboo-based biochar composite material and a preparation method thereof.The method comprises the steps that bamboo powder serves as a raw material, a deep eutectic solvent system composed of choline chloride and urea according to the molar ratio of 1: 2 is adopted, and a functional small molecule composite system composed of lactic acid and ethanolamine is introduced; the bamboo powder is subjected to esterification and ammoniation pretreatment to construct nitrogen-oxygen functionalized active sites, meanwhile, beta cyclodextrin is added as a degradable green template agent, and the beta cyclodextrin is self-degraded in the carbonization process to form a hierarchical porous structure. The bamboo-based biochar obtained after drying, carbonization and composite modification has high specific surface area, high functional group density and excellent adsorption performance. The method does not need acid-base activation, is green in process and low in energy consumption, has a hierarchical pore structure and chemical functionalization characteristics, and is suitable for wastewater heavy metal adsorption, gas purification and catalytic carrier application.

The application discloses a compound acidity regulator and a preparation method thereof, and relates to the field of acidity regulators. The compound acidity regulator comprises the following components in percentage by weight: modified glacial acetic acid: 25-35%, citric acid: 8-12%, lactic acid: 8-12%, DL-malic acid: 3-7%, and the rest is purified water; the modified glacial acetic acid is prepared by inclusion of glacial acetic acid molecules by beta cyclodextrin. The preparation method comprises the following steps: diluting the modified glacial acetic acid by adding 55-65% of the formula amount of purified water under a low-temperature environment; sequentially adding citric acid, lactic acid and DL-malic acid, and the interval time between two adjacent acids is 5-10 min; uniformly dispersing by high-speed stirring; adding the remaining purified water, and continuously stirring at high speed until colorless and transparent, so as to obtain the compound acidity regulator. The application can realize the synergistic optimization of acidity intensity, flavor softness, dissolution rate and storage stability.

The invention belongs to the technical field of plant extraction, and particularly relates to an efficient extraction and purification process of total glycosides of centella asiatica, which comprises the following preparation steps: crushing dried centella asiatica, adding a specific degreasing agent into the crushed centella asiatica, stirring, centrifuging, drying and collecting centella asiatica powder; adding a mixed functional enzyme and pure water, adjusting the pH value to 5-6.5, carrying out enzymolysis at 45-55 DEG C for 2-4 hours, and carrying out enzyme deactivation, concentration and drying, so as to obtain an enzymolysis centella asiatica solid; adding an extraction solution, heating, stirring and separating to obtain supernate and a solid, adding the extraction solution into the solid, repeatedly extracting for 1-2 times, combining the supernate, adding modified beta-cyclodextrin, and stirring to obtain a centella asiatica extracting solution; concentrating the centella asiatica extracting solution into paste, performing alcohol precipitation, removing ethanol under reduced pressure, and drying to obtain the centella asiatica total glycosides. The asiatic pennywort herb total glycosides prepared by the method are relatively high in purity and have very good biological safety.

The present application relates to the field of hydrogel tissue engineering, and particularly relates to an injectable conductive hydrogel and a preparation method and application thereof. The preparation method of the injectable conductive hydrogel comprises the following steps: mixing 7-amino beta cyclodextrin and four-arm polyethylene glycol amino to obtain a complex solution containing a slip ring structure; and mixing the complex solution containing the slip ring structure with a four-arm polyethylene glycol maleimide solution containing silver nanowires. The method for preparing the injectable conductive hydrogel with high mechanical properties is simple, and the prepared hydrogel has high mechanical properties, excellent tensile and compressive deformation capacity and fatigue resistance. The present application provides a new method for the application of the injectable hydrogel in the body.

The application discloses a carbon-coated copper catalyst and a preparation method and application thereof, and relates to the technical field of catalysts; the technical scheme is that beta cyclodextrin is used as a carbon source, so that copper-containing active components are uniformly distributed on a carbon coating layer; wherein, the carbon coating layer derived from cyclodextrin pyrolysis can effectively inhibit the migration and agglomeration of copper active sites, so that the catalyst has higher selectivity and better reaction activity, and the improvement of catalytic performance is promoted; the carbon-coated copper catalyst is suitable for catalyzing the hydrogen production reaction of ethanol aqueous-phase reforming, the hydrogen production rate reaches 35.6 mu mol H2 / gcat / s, the hydrogen selectivity is higher than 99.9%, and long-time continuous and stable operation of the hydrogen production of ethanol aqueous-phase reforming can be ensured.

The invention belongs to the technical field of biomedical materials and biomedical engineering, and discloses self-repairing peach gum hydrogel based on reversible subject-object and boric acid ester bonds, a preparation method and application. The preparation method comprises the following steps: modifying boric acid and amantadine on purified peach gum to obtain boric acid-amantadine peach gum; modifying chitosan with carboxymethyl cyclodextrin to obtain beta cyclodextrin-chitosan; boric acid-amantadine peach gum and beta cyclodextrin-chitosan are mixed, and the self-repairing peach gum hydrogel is obtained through the mutual synergistic effect of a subject, a guest and boric acid ester. The hydrogel has multiple functions of excellent biocompatibility, self-repairing, hemostasis, antibiosis and the like, and can be applied to body surface skin wound repairing.