141 results about "Sodium periodate" patented technology

The invention discloses a preparation method of an edible pectin film capable of monitoring and prolonging fruit freshness, which comprises the following steps: carrying out oxidation reaction on pectin and sodium periodate, then terminating the reaction and purifying to obtain oxidized pectin; the preparation method comprises the following steps: dissolving oxidized pectin in water, then adding histidine, and carrying out heating reaction at 60-120 DEG C for 1-3 hours to obtain a reaction product with pH-responsive fluorescence characteristics; adding a calcium chloride aqueous solution as a cross-linking agent into the reaction product, simultaneously adding glycerol as a plasticizer, stirring and mixing for 5-15 minutes at the temperature of 50-70 DEG C, and then stirring and mixing for 1.5-2.5 hours at the temperature of 20-30 DEG C to obtain a uniform film forming solution; pouring the film-forming liquid into a film, and drying to obtain an edible pectin film; the invention also provides the edible pectin film prepared by the preparation method. The prepared edible pectin film is mainly used for packaging fruits, and the freshness of the fruits can be visually displayed through fluorescence change while the fruits are kept fresh.

The invention discloses a novel dust falling material with strong wettability and high strength and toughness and a preparation method thereof. The novel dust falling material is prepared from the following raw materials in parts by weight: 1-3 parts of pectin, 10-35 parts of acrylamide, 1-2.5 parts of an initiator, 0.06-0.1 part of sodium periodate, 20-60 parts of bentonite, 8-12 parts of a wetting agent and 1000-3000 parts of water. According to the dust suppressant, the remarkable advantages of performance breakthrough, environment friendliness and economic optimization are achieved through the synergistic effect of multiple components, it is measured through experiments that the dust suppressant can form a solidified shell layer with toughness and strength on the surface of a coal sample, and the dust suppressant has the unique double-water-locking mechanism that polymer carboxyl chemical bonding water molecules and bound water physically adsorbed between bentonite layers are combined, so that the dust suppressant has the good dust suppressant effect on the surface of the coal sample. A good water loss rate can be maintained in a high-temperature drought environment, and the dust suppression efficiency can be improved due to the rapid film forming characteristic. A solidified layer with a complete structure is formed after drying, pulverized coal is effectively prevented from loosening, the inhibition rates of PM2.5 and PM10 both exceed 95%, and the efficient and lasting dust suppression effect is achieved.

The invention discloses a degradable packaging material and a preparation method thereof, and relates to the field of packaging materials. When the degradable packaging material is prepared, after vermiculite powder is grafted with chloromethyltrimethoxysilane, the vermiculite powder reacts with piperazine, bis (2-chloroethyl) methylphosphonate and ethylenediamine, and modified vermiculite powder is obtained; oxidizing corn starch with sodium periodate to obtain modified corn starch; the preparation method comprises the following steps: reacting polyvinyl alcohol, allyl trimethyl ammonium chloride and 5-allyl mercapto-[1, 3, 4] thiadiazole-2-amine to obtain modified polyvinyl alcohol; and uniformly mixing the modified corn starch, glycerol, modified polyvinyl alcohol, modified vermiculite powder and zinc chloride to obtain the degradable packaging material. The degradable packaging material prepared by the invention has excellent flame retardance, antibacterial property, mechanical property and rapid degradability.

The invention provides a high-barrier nanocellulose-based composite liquid mulching film and a preparation method thereof.The preparation method comprises the steps that sodium periodate is added into a sodium alginate solution for an oxidation reaction, an oxidized sodium alginate solution is obtained, a chitosan solution is added into the oxidized sodium alginate solution, and a composite solution is obtained after uniform mixing; mixing the nanocellulose solution with the composite solution, dropwise adding an ammonia water solution to adjust the pH value, and carrying out a cross-linking reaction to obtain a matrix solution; the preparation method comprises the following steps: dissolving 2-acrylamido-2-methylpropanesulfonic acid and methacryloyloxyethyl trimethyl ammonium chloride in deionized water to obtain a precursor solution, and adding an initiator into the precursor solution for copolymerization to obtain a zwitterionic polymer; adding a zwitterionic polymer into the Na-montmorillonite dispersion liquid for intercalation reaction to obtain modified montmorillonite; and uniformly mixing the matrix solution, the modified montmorillonite, the plasticizer, the rheology modifier and the surfactant, and then carrying out standing curing and vacuum defoaming.

The invention belongs to the technical field of mineral flotation, and particularly relates to a cellulose-based coal slime collecting agent and a preparation method and application thereof. The method comprises the following steps: performing wet grinding on recycled waste paper to obtain a paper pulp solution, stirring until paper pulp fibers are uniformly dispersed, adding excessive lithium chloride and sodium periodate, performing stirring reaction, cleaning and centrifuging to obtain precursor cellulose, performing amino alkylation modification to obtain amino alkyl cellulose, preparing the amino alkyl cellulose into a 20 g / L solution, and performing vacuum drying to obtain the lithium ion battery cathode material. And then uniformly mixing with non-polar hydrocarbon oil according to the volume ratio of 1: 2 to obtain the coal slime collecting agent. The prepared coal slime collecting agent contains the hydrophobic nanocellulose with the large length-diameter ratio, in the flotation process, adhesion of bubbles and minerals can be promoted, diffusion of the bubbles is promoted, and the flotation efficiency and the recovery rate are improved.

The invention belongs to the technical field of oil-proof coatings, and discloses a starch-based oil-proof coating as well as a preparation method and application thereof. The method comprises the following steps: 1) reacting cassava starch with sodium periodate under the condition that the pH is 2-4, centrifugally washing to be neutral, and drying to obtain dialdehyde starch; 2) dispersing dialdehyde starch in water, and then performing gelatinization treatment to obtain a dialdehyde starch solution; dissolving chitosan in an acetic acid solution to obtain a chitosan solution; and 3) mixing the chitosan solution with the dialdehyde starch solution, adjusting the pH value to be acidic, and reacting to obtain the starch-based oil-proof coating. The method is simple, green and environment-friendly; the prepared coating is safe and biodegradable, has excellent oil-proof performance, and improves the tensile strength and tear strength of the paper.

This invention discloses a composite hydrogel based on a polysaccharide-based hybrid dual network, its preparation method, and its applications, belonging to the field of marine polysaccharide technology. Based on the important role of amorphous calcium phosphate, a precursor in biomineral formation, in mineralization, this invention prepares a multifunctional composite hydrogel with wet bonding, antibacterial, and remineralization functions. This composite hydrogel can achieve rapid and convenient repair of enamel demineralization. This invention prepares oxidized sodium alginate via an alcohol-aqueous phase using the sodium periodate method. Sodium alginate reacts with carboxymethyl chitosan and dopamine through a Schiff base reaction to form dynamic imine bonds, thus preparing an in-situ self-crosslinking hydrogel. Simultaneously, amorphous calcium phosphate is introduced for secondary crosslinking, preparing a dense dual-network composite hydrogel. The composite hydrogel prepared by this invention has an interconnected three-dimensional porous structure, stable mechanical properties, and uniformly dispersed amorphous calcium phosphate in the form of nanospheres. The composite hydrogel prepared by this invention provides an integrated strategy with clinical translational potential for orthodontic enamel demineralization, with broad market prospects.

The application belongs to the technical field of soft capsules, and discloses a starch-based soft capsule material and a preparation method thereof. The preparation method comprises the following steps: mixing wheat starch and deionized water, adding a sodium periodate solution to react, so as to obtain dialdehyde starch; reacting the dialdehyde starch with glycidyl methacrylate and triethylamine, so as to obtain grafted modified starch; mixing the grafted modified starch with modified nano-silicon dioxide, and reacting after ultrasonic oscillation, so as to obtain nano-silicon dioxide composite modified starch; mixing the composite modified starch with polyvinyl alcohol and polyvinylpyrrolidone, so as to obtain a film forming solution; and after the film forming solution is cast and dried, hot pressing is performed, so that the starch-based soft capsule material is finally obtained. The starch is subjected to multiple hydrophobic modifications, so that the hydrophilic performance is reduced, and the stability of the soft capsule is improved.

The invention relates to the technical field of battery diaphragms, in particular to a wood fiber composite diaphragm and a preparation method thereof. According to the diaphragm, renewable softwood pulp is used as a basic raw material, after aldehyde groups are introduced through sodium periodate oxidation, tannic acid, zinc acetate and cystamine are utilized to synergistically construct a zinc coordination network functional layer; then, molecular crosslinking with methoxypolyethylene glycol, polyethylene glycol, hexamethylene diisocyanate, gamma-aminopropyltriethoxysilane and nano silicon dioxide is realized under the action of a catalyst; and finally, the paper-making and hot-pressing processes are performed to prepare and mold. The diaphragm is particularly suitable for being applied to high-safety and high-performance aqueous metal zinc batteries, and an innovative technical path is provided for industrialization and green upgrading of zinc ion battery diaphragm materials.

This invention discloses a method for preparing a self-healing, antibacterial dynamic hydrogel and its coating application. The method includes: 1. Reacting konjac glucomannan with sodium periodate to achieve aldehyde functionalization, and mixing it with sodium alginate powder to prepare a precursor polymer solution A; 2. Mixing an acylhydrazide or hydroxylamine small molecule crosslinking agent with an aminoglycoside drug to prepare an amino crosslinking agent solution B, and preparing a calcium salt ionic crosslinking agent solution C; 3. Mixing the three solutions and allowing them to stand to obtain a hydrogel. The application involves coating a hydrogel mixture solution onto a biodegradable metal surface after preparing a polyethyleneimine auxiliary layer and then gelling it. This invention utilizes aldehyde-functionalized oxidized konjac glucomannan and two crosslinking agents to form acylhydrazone, oxime, and imine bond networks, endowing the hydrogel with self-healing, self-responsive, and long-term antibacterial properties. The hydrogel of this invention improves the biocompatibility, antibacterial properties, and stability of biodegradable metal substrates, making it suitable for biodegradable implantation applications.

The present invention relates to a preparation method and application of a cyclodextrin - histidine / lanthanum complex, belonging to the technical field of fluorescence sensors. The preparation method includes: mixing a cyclodextrin - histidine fluorescent molecule with a lanthanum source in a solution and heating for reaction to obtain a cyclodextrin - histidine / lanthanum fluorescent complex; wherein, the preparation method of the cyclodextrin - histidine fluorescent molecule includes: mixing an aldehyde - group cyclodextrin and histidine in an aqueous solution for reaction to obtain; the aldehyde - group cyclodextrin is an aldehyde - group cyclodextrin obtained by pre - oxidizing β - cyclodextrin with sodium periodate. Compared with the prior art, the cyclodextrin - histidine / lanthanum complex prepared by the present invention can directly and highly specifically recognize phosphate ions, realizing highly sensitive detection of phosphate ions, being more suitable for accurate detection of trace pollutants at low concentrations and highly selective detection. In addition, portable detection of phosphate ions can be realized through a visualization technique based on fluorescence images.

The invention relates to the technical field of medical and chemical medicines, in particular to a novel synthesis method of L (-)-threo-3-hydroxyaspartic acid hydrochloride. The preparation method comprises the following steps: by taking cheap and easily available D-phenylglycinol as an initial raw material, firstly protecting amino with Boc anhydride, then oxidizing to obtain N-BOC-D-phenylalanine aldehyde 3, then carrying out Grignard reaction on the N-BOC-D-phenylalanine aldehyde 3 and vinyl magnesium bromide at low temperature to obtain corresponding o-amino alcohol, then reacting the o-amino alcohol with 2, 2-dimethoxypropane at 0 DEG C under the catalytic action of p-toluenesulfonic acid, and finally obtaining the 2, 2-dimethoxypropane. The obtained compound 4 is subjected to Upjohn dihydroxylation reaction and sodium periodate oxidation to obtain corresponding aldehyde, and then the aldehyde is oxidized by potassium permanganate under a weak acidic condition to obtain corresponding carboxylic acid 5. Oxidizing a benzene ring by taking ruthenium trichloride as a catalyst and sodium periodate as a co-oxidant to obtain dicarboxylic acid; and finally, refluxing and deprotecting by using hydrochloric acid to obtain the L (-)-chloro-3-hydroxyaspartic acid hydrochloride.

This invention relates to the technical field of organic chromium-free tanning agents, and discloses a method for preparing a sustainable green amphoteric organic chromium-free tanning agent, comprising the following steps: (1) adding corn starch to water, then adding sodium periodate, stirring and reacting in the dark to obtain DCST product; (2) mixing ethylene glycol diglycidyl ether, acetone and tetramethylenediamine, then adding hexahydro-1,3,5-tris(hydroxyethyl)-s-triazine dropwise, maintaining the reaction for a period of time after the addition is complete; after the reaction is complete, distilling under reduced pressure to obtain HHTT-EGDE product; (3) dispersing the HHTT-EGDE product in water to obtain HHTT-EGDE solution; mixing the HHTT-EGDE solution with the DCST product, heating and reacting to obtain organic chromium-free tanning agent. Leather tanned with the organic chromium-free tanning agent of this invention has higher Ts, better mechanical strength, whiteness and antibacterial properties.

The invention relates to the technical field of organic water-soluble fertilizers, in particular to an organic water-soluble fertilizer suitable for crops and a preparation method of the organic water-soluble fertilizer. The preparation method sequentially comprises the following steps: adjusting the pH value of an aqueous solution to 5.3-5.7, adding sodium polyaspartate, carboxyl polyethylene glycol carboxyl and dopamine hydrochloride, carrying out a condensation reaction in the presence of a condensing agent, and obtaining a solution A after the condensation reaction is ended; adding tannic acid, ferric nitrate and citrate, and keeping the pH value to obtain a solution B; adjusting the pH value to 6.6-7.0, adding sodium periodate for oxidation, and introducing taurine, histamine and ascorbic acid to obtain a solution C; and finally, adding carbonate, a large amount of ferric nitrate, zinc-magnesium salt and citrate, adjusting the pH value, and supplementing water to a certain amount to obtain a final product. By constructing a multidentate ligand and dynamic covalent network synergistic system, the long-term stability and anti-interference capability of metal ions are remarkably improved, hydrolytic precipitation is effectively inhibited, the low water-insoluble substance content is maintained, and good storage stability and field yield increasing effect are achieved.

The invention relates to the technical field of preparation of natural polysaccharides for in-vivo implantation, and particularly discloses a preparation method of low-molecular-weight oxidized sodium alginate and application of the low-molecular-weight oxidized sodium alginate as a biological cross-linking agent. The preparation method of the low-molecular-weight oxidized sodium alginate comprises the steps that a sodium alginate solution is prepared, after calcium coagulation acidification and neutralization pretreatment, a sodium periodate solution is added for an oxidation reaction, after the reaction is completed, modified activated carbon is added for adsorption and carbon removal, then the oxidized sodium alginate solution is obtained, and an MOFs structural layer is loaded in the modified activated carbon; dialyzing the oxidized sodium alginate solution, and freeze-drying to obtain purified oxidized sodium alginate; and carrying out gamma irradiation treatment on the purified oxidized sodium alginate to obtain the sodium alginate. The oxidized sodium alginate prepared by the preparation method of the low-molecular-weight oxidized sodium alginate is relatively low in harmful impurity content and relatively high in safety, the molecular weight is about 2000, and the oxidized sodium alginate has excellent cross-linking performance when being used as a biological cross-linking agent for an in-vivo implant material.

The invention belongs to the technical field of hydrogel preparation, and relates to a preparation method and application of metabolism programming hydrogel, and the preparation method comprises the following steps: 1, oxidizing dextran Dex through sodium periodate NaIO4 to generate oxidized dextran ODex rich in aldehyde; 2, under the protection of nitrogen, carrying out amino dynamic Schiff base reaction of APTC and carrying out covalent binding with an aldehyde group of oxidized dextran ODex to form ODex-APTC; 3, mixing ODex-APTCC and CMC GOx solutions at room temperature to form hydrogel based on hemiacetal crosslinking and a hydrogen bond mechanism; according to the invention, autonomous'antibacterial repair 'dual-phase switching is realized through metabolic microenvironment reprogramming; in the stage of wound surface high-glucose infection, the hydrogel utilizes a diabetes wound surface high-glucose environment as an endogenous fuel, and glucose reduction, active oxygen mediated sterilization and microenvironment acidification are realized at the same time through reaction of glucose oxidase and glucose; when glucose oxidase reacts, the acid environment triggers a controlled H2S release program, and wound healing is accelerated by relieving oxidative stress and activating a regeneration signal channel.

The invention provides oxidized sanguisorba officinalis cross-linked collagen hemostatic sponge and a preparation method thereof.The preparation method comprises the steps that firstly, sanguisorba officinalis extract is oxidized with sodium periodate, dialyzed and freeze-dried into powder, then the powder is dissolved with an acetic acid solution, a collagen solution is dropwise added, dialyzed and freeze-dried, and an oxidized sanguisorba officinalis cross-linked collagen sponge product is obtained; due to the introduction of the oxidized sanguisorba officinalis extract, the blood coagulation effect of collagen is effectively promoted, the endogenous blood coagulation effect of collagen can be remarkably improved, and the collagen has the capacity of inducing cell adhesion, proliferation and growth and meets the use requirements of medical materials.

The invention relates to the field of pharmaceutical chemicals, and particularly discloses a synthesis method of 3-tertiary butyl dimethyl siloxy-3-(furan-2-yl)-propionaldehyde. The preparation method comprises the following steps: reacting 1-tert-butyldimethylsiloxy-1-(furan-2-yl)-butyl-3-ene with an aqueous solution of permanganate in the presence of ethylene glycol to generate an o-dihydroxyl intermediate, and then reacting the o-dihydroxyl intermediate with sodium periodate to prepare the 3-tert-butyldimethylsiloxy-3-(furan-2-yl)-propionaldehyde. The 3-tert-butyldimethylsilyloxy-3-(furan-2-yl)-propionaldehyde is synthesized by adopting the method disclosed by the invention, so that the defects that the cost is too high, the environmental protection property is poor and large-scale industrial production cannot be realized in the traditional production process are overcome.

The invention relates to a one-step purified dual-modified hyaluronic acid hydrogel and a preparation method thereof, and the preparation method comprises the following steps: under a dark condition, dropwise adding a sodium periodate solution into a sodium hyaluronate solution to carry out hydroformylation reaction, and quenching to obtain a hydroformylated hyaluronic acid reaction solution; cooling the hydroformylated hyaluronic acid reaction solution to 2-6 DEG C, dropwise adding a methacrylic anhydride solution under a dark condition to perform esterification reaction, controlling the pH value of the reaction to be 8-9, and purifying and drying after the reaction is finished to obtain dual modified hyaluronic acid; and dissolving the dual-modified hyaluronic acid and a photoinitiator in a PBS buffer solution to form a precursor solution, and carrying out a photo-crosslinking reaction to obtain the dual-modified hyaluronic acid hydrogel. According to the preparation method disclosed by the invention, aldehydes are firstly subjected to esterification reaction, so that mutual interference is avoided, side reactions are reduced by controlling reaction conditions, and the obtained hydrogel has controllable gelation time, excellent mechanical properties, swelling resistance, long-term stability and good blood compatibility.

The application discloses a kind of preparation and application of composite aerogel material for removing water microplastics, belong to microplastics removal field.The method comprises the following steps: (1) carboxymethyl cellulose and hexanediamine are dissolved in water, N-hydroxysuccinimide solution and carbodiimide hydrochloride solution are added, then the reaction liquid is dialyzed, the reaction liquid after dialysis is evaporated under reduced pressure to obtain viscous liquid, then the obtained viscous liquid is prepared into CMC-NHNH2 solution with water;(2) cellulose nanocrystal is dissolved in water, then sodium periodate is added, after stirring, stop the reaction by adding ethylene glycol to obtain reaction liquid, then the reaction liquid is dialyzed, and the dialyzed reaction liquid is evaporated under reduced pressure, and then adjusted to CNC-CHO solution with water;(3) Fe3O4@C 12 It is added to CNC-CHO solution, and added to CMC-NHNH2 solution, shaken and mixed uniformly, refrigerated, and then freeze-dried to obtain composite aerogel material.

The invention belongs to the technical field of fluorescent sensors, and relates to an amphiphilic fluorescent aggregate based on cyclodextrin-amino acid as well as a preparation method and application thereof, the preparation method comprises the following steps: heating aldehyde cyclodextrin, amino acid, sodium bicarbonate and a surfactant in water for reaction to obtain the amphiphilic fluorescent aggregate; wherein the aldehyde group cyclodextrin is aldehyde group cyclodextrin which is obtained by adopting sodium periodate to pre-oxidize beta-cyclodextrin; the amphiphilic fluorescent aggregate is used as a fluorescent probe for qualitative and / or quantitative detection of trifluoroacetic acid in a water body. Compared with the prior art, the fluorescent aggregate is endowed with amphipathy by introducing the surfactant, trifluoroacetic acid in a water phase is directly identified with high specificity by utilizing the amphipathy, high-selectivity detection of trifluoroacetic acid is realized through hydrophilic and hydrophobic effects, and the fluorescent aggregate has the advantages of simple preparation, stable signal, high selectivity, high interference resistance and the like.

Clethodim sulfoxide, its synthesis method, and applications relate to the field of chemical synthesis technology. The aforementioned method for synthesizing clethodim sulfoxide uses clethodim and sodium periodate as reaction materials and produces clethodim sulfoxide through an oxidation reaction. This method for synthesizing clethodim sulfoxide is simple, low-cost, high-purity (reaching over 97%), and high-yield (reaching over 93%). Furthermore, clethodim sulfoxide is a metabolite of clethodim. The synthesized standard of clethodim sulfoxide can facilitate the detection of herbicide and metabolite residues in agricultural products and herbal medicines, enhancing quality control and improving their safety.

The invention relates to the technical field of cigarette filter stick paper, in particular to paper filter stick paper for cigarettes and a preparation method thereof, and the paper filter stick paper comprises the following raw materials in parts by weight: 250-300 parts of water, 35-40 parts of a first base material, 30-35 parts of a second base material, 6-8 parts of glycerol, 2-3 parts of triethyl citrate, 8-12 parts of aluminum hydroxide, 2-4 parts of citric acid and 8-12 parts of an additive. According to the invention, the corn starch selectively oxidized by sodium periodate is used as a first base material, and the bamboo pulp fiber subjected to fine treatment is used as a second base material, so that the traditional cellulose acetate is completely replaced, the biodegradation rate of the filter stick in the environment is obviously accelerated, and the pollution problem caused by material inertia is fundamentally solved.

The invention relates to the fields of chemistry and chemical engineering, organic synthesis and medicinal chemistry, in particular to a method for synthesizing 5-bromo-2-chlorobenzoic acid by adopting a microchannel reaction device. The method comprises the following steps: I, mixing 2-chlorobenzoic acid and sulfuric acid to obtain a reaction solution A; mixing bromine, sodium periodate, liquid organic acid and water to obtain a reaction solution B; and II, feeding the reaction liquid A and the reaction liquid B into a micro mixer of a micro-channel reaction device for mixing, then feeding the mixture into a micro reactor of the micro-channel reaction device for contact reaction, and carrying out post-treatment on contact reaction effluent to obtain the 5-bromo-2-chlorobenzoic acid. The method has the advantages of high product selectivity, high yield, high purity, convenient process, low production cost, and less by-product and three-waste pollution.

The present application relates to the technical field of adhesives, and in particular to a medical tissue adhesive and a preparation method thereof. The medical tissue adhesive comprises the following raw materials in parts by weight: 8-12 parts of a polyglutamic acid grafted thermosensitive polymer, 0.8-1.2 parts of vitamin C, 0.8-1.2 parts of sodium periodate, 0-1.2 parts of sodium alginate, 0-1.2 parts of chitosan oligosaccharide, and 2.5-3.5 parts of polyethylene glycol; the polyglutamic acid grafted thermosensitive polymer is prepared by reacting polyglutamic acid and a thermosensitive polymer containing an acid anhydride, and the temperature-sensitive polymer is prepared by copolymerizing an acid anhydride containing a double bond, N-vinyl pyrrolidone, and N-isopropylacrylamide; the medical tissue adhesive has the advantages of improving the hemostatic effect and adhesion of the medical adhesive.

The invention discloses a preparation method of collagen hydrogel crosslinked by oxidized hyaluronic acid. The preparation method comprises the following steps: pretreating collagen; performing high-pressure homogenization to prepare collagen homogenate; the sodium hyaluronate is oxidized and modified by sodium periodate; and carrying out a cross-linking reaction on the oxidized hyaluronic acid and the collagen homogenate to form cured hydrogel, and compounding the cured hydrogel with sulfonated chitosan and coating the cured hydrogel with trehalose to obtain the collagen hydrogel. The collagen is subjected to pretreatment and high-pressure homogenization, so that on the basis of ensuring a three-helix structure of the collagen, the particle size of collagen fibers can be reduced, the steric hindrance of a cross-linking reaction can be reduced, and the cross-linking reaction is more efficient, controllable and uniform. Through triple hydration network design, an HA hydrophilic group is introduced through aldehyde group-amino crosslinking, a sulfonic group anchors water molecules through ionic bonds, the proportion of bound water is increased, after trehalose coating, a glassy hydration layer is formed, the migration rate of the water molecules is reduced, and the problem that a traditional collagen implant is dehydrated and falls back within 1-2 weeks is solved.

The application discloses a preparation method of a responsive dynamic hydrogel, and the method comprises the following steps: firstly, dispersing sodium alginate and then performing a directional oxidation reaction with a sodium periodate aqueous solution to obtain oxidized sodium alginate containing an aldehyde group, and then dissolving the oxidized sodium alginate in a hot polyvinyl alcohol solution to obtain a precursor mother liquor A; secondly, dissolving a water-soluble chitosan derivative in deionized water, adding aminobenzene boronic acid small molecules, and then heating to obtain a precursor mother liquor B; and thirdly, mixing the precursor mother liquor A and the precursor mother liquor B to obtain the dynamic hydrogel. The precursor mother liquor A is coated on a medical material substrate, and then the precursor mother liquor B is coated on the medical material substrate. The aldehyde group and the amine group are utilized to form an imine bond crosslinking, and meanwhile, the benzene boronic acid group and the vicinal diol are utilized to form a borate ester bond crosslinking, so that the prepared hydrogel has a rapid gelation capacity, pH and ROS responsiveness and a suitable elastic modulus. After the hydrogel is applied to the medical material substrate, the bioreactivity and the interfacial mechanical softness of the medical material substrate are improved.

The invention discloses a modified cellulose acetate dialysis membrane and a preparation method thereof.The preparation method comprises the following steps that after a cellulose acetate membrane is hydrolyzed for 1 min, the acetyl part of the cellulose acetate membrane is removed, then the cellulose acetate membrane with the acetyl part removed is subjected to an oxidation reaction, and the cellulose acetate membrane with the acetyl part removed is obtained; a selective oxidation catalyst A and / or a co-catalyst B are / is used in the oxidation reaction process, and an oxidant C is one of sodium hypochlorite, sodium chlorite, calcium hypochlorite, hydrogen peroxide, persulfate or sodium periodate; and then adding chitosan which is subjected to crosslinking modification by dialdehyde cellulose to carry out grafting reaction. According to the method, the grafting effect can be optimal only through the synergistic cooperation of the carboxyl active site amount and the crosslinking degree of the chitosan, and the urea adsorption capacity and the blood compatibility of the cellulose acetate membrane are remarkably improved.

The invention relates to the technical field of environmental governance and resource reutilization, and discloses an adsorbent based on Maotai-flavor liquor vinasse modification and a preparation method and application thereof. The adsorbent is prepared by taking Maotai-flavor liquor vinasse as a raw material through alkali treatment, cellulose extraction, sodium periodate oxidation, polyethyleneimine grafting and crosslinking with ferroferric oxide, a KH560 silane coupling agent and sodium alginate. The adsorbent has a rich mesoporous structure, a high specific surface area and good magnetism, can efficiently adsorb heavy metal ions such as Cd < 2 + > in a water body, is high in adsorption capacity, can be magnetically separated, can be repeatedly used, and is suitable for heavy metal wastewater treatment and resource utilization.

The present application provides a sericin / guar gum / polyvinyl alcohol (PVA) composite gel and its application as a fever-reducing patch. For the first time, sericin, cationic guar gum and PVA are used as a composite matrix, and sodium periodate and copper sulfate are introduced simultaneously. Through the precise assignment and synergistic effect of functional units, the problems of microbial contamination and insufficient high-temperature stability are systematically solved. The composite gel prepared by the present application has the advantages of initial adhesion (instant fixation), environmental stability (resistant to heat 42℃ / resistant to cold 0℃), good sustained cooling effect and skin safe pH (4.5-7.0), and is very suitable for clinical application.