54 results about "Chitosan" patented technology

The invention provides a method for preparing chitosan with ultrahigh deacetylation degree from euphausia superba as a raw material. The method sequentially comprises the following steps: removing mineral substances, removing proteins and lipids, removing mineral substances, removing proteins and lipids, deacetylating and purifying. According to the method, the euphausia superba is taken as the raw material, and the prepared chitosan has few impurities and a high deacetylation degree, and can be applied to the fields of medicines and biology.

The invention discloses skin-care permanently-antibacterial DP finishing liquid for shirts and a finishing method. The skin-care permanently-antibacterial DP finishing liquid is prepared from gelatin, Arabic gum, Flos Lonicerae extract, Chinese gall extract, Tween 60, span-80, 25% glutaraldehyde, an emulgator SPO10, butanetetracarboxylic acid, ammonium citrate, triethanolamine, lauric acid, sodium hypophosphite, boric acid, a diphenylethene disulfonic acid derivative, boron trifluoride diethyl etherate, PEG 1500, methylsiloxane, chitosan, N,N-dimethylformamide, demulsifier N-220 series, an appropriate amount of maleic anhydride and an appropriate amount of water. The skin-care permanently-antibacterial DP finishing liquid for shirts has the advantages that a natural antibacterial active substance is wrapped through advanced microcapsulary and releases slowly to achieve permanent antibacterial and deodorization performance and make wearers feel refreshing and comfortable; fabrics finished by the DP finishing liquid are excellent in wear durability, waterproofing performance and non-ironing performance and highly resistant to crease, thereby being time saving and labor saving and excellent in wearability.

The invention discloses a polylactic acid/chitosan composite nano fiber scaffold, a preparation method and application thereof. The matrix of the scaffold is polylactic acid nano fiber scaffold, and the outer wall and inner pores of the polylactic acid nano fiber scaffold are evenly distributed with chitosan nano fiber. The preparation method comprises the following steps: first filling the inner pores of the polylactic acid nano fiber scaffold prepared by primary phase separation with chitosan acetum; and then evenly distributing the chitosan nano fiber prepared by secondary phase separation on the outer wall and inner pores of the polylactic acid nano fiber scaffold to obtain bionic polylactic acid/chitosan composite nano fiber scaffold. The invention has simple preparation method, the structure of the obtained nano fiber scaffold is similar to that of natural extracellular marix, has good mechanical property and biocompatibility, can effectively promote migration, growth and differentiation of osteocyte.

The invention discloses a preparation technology for establishing a compound edible preservative film on the surface of a fresh-cut purple yam. The preparation technology comprises the following steps: 1), taking oregano essential oil as a core material and taking beta-cyclodextrin as a wall material, prepare a beta-cyclodextrin-oregano essential oil microcapsule, then selecting chitosan as antibacterial film coating liquid as a base material, and mixing the beta-cyclodextrin-oregano essential oil microcapsule and the chitosan base material, so as to obtain antibacterial film coating liquid; 2), adding an appropriate amount of sodium alga acid into a citric acid water solution, so as to obtain color-protecting film coating liquid; 3), finally establishing the edible preservative film on the surface of a pretreated fresh-cut purple yam through a layer-by-layer assembly method. The preparation technology is simple, and the formed compound preservative film for the preservation of the fresh-cut purple yam is safe, green and edible, and can inhibit the growth of microorganism on the surface of the fresh-cut purple yam while performing preservation on the fresh-cut purple yam, thereby prolonging the shelf life of the fresh-cut purple yam.

The invention discloses a temperature-sensitive wall material. The temperature-sensitive wall material comprises a temperature-sensitive material modified polymer wall material, wherein the temperature-sensitive material is polyvinylpyrrolidone, glycerophosphate, stearic acid, galactose-removed xyloglucan or gelatin-chitosan, poly(N-isopropylacrylamide) and hydroxybutyl chitosan. The temperature-sensitive wall material releases drugs at different temperatures, the drug release time is flexibly controlled, the phytotoxicity is reduced, and the drug action time is prolonged. The temperature-sensitive wall material can be applied to whole-course pesticide application protection of the growth cycle of crops, the chemical application frequency is reduced, and the crop management efficiency is improved. The invention also provides a corresponding microcapsule and a preparation method.

The invention relates to a preparation method of a composite hemostasis material, and belongs to the technical field of composite materials. The composite hemostasis material is prepared from silver-supported seaweed fibers, sodium carboxymethylcellulose, chitosan and starch. The material has a good hemostatic effect and an antibacterial property, and above adopted raw materials are degradable materials, do not cause inflammations of wounds during use, and promote the growth of new tissues, the chitosan is crosslinked with the surface of erythrocytes to make erythrocytes adhered in order to form thrombus to stop bleeding, carboxymethyl cellulose has a good film forming property, and also has an adhesion preventing effect, the seaweed fibers which are a wound covering material have an excellent affinity, and can help to clot wound blood, absorb excessive secretions of the wound and keep the wound at a certain humidity in order to enhance the healing effect, and the seaweed fiber covering material allows oxygen to go through and bacteria to be blocked after in contact with a wound body fluid in order to promote the growth of the new tissues.

The invention discloses a preparation method of chitosan antibacterial viscose fibers. The preparation method comprises the following steps: 1) preparing a viscose spinning raw solution; 2) preparing chitosan antibacterial powder; 3) spinning; 4) collecting. According to the preparation method, a carrying effect of hot air is utilized and then the chitosan antibacterial powder is adhered and distributed on surfaces of the viscose fibers, so that raw materials are saved and original basic performances of the viscose fibers are easy to keep; furthermore, the chitosan antibacterial viscose fibers prepared by the preparation method have relatively good antibacterial performance and durability.

The invention provides a method of preparing an Al<3+>-chitosan-fly ash ternary composite flocculant by one step. In particular, the method includes following steps: (1) extracting the Al<3+> from fly ash with acid and dissolving chitosan with the acid extract; and (2) performing a complexing reaction to combine the Al<3+>, the chitosan and gray substance of the fly ash to form the Al<3+>-chitosan-fly ash ternary composite flocculant, which is used for alga and turbidity removal of a eutrophic water body. The method is simple in steps and is free of large amounts of chemical reagents. In addition, the composite flocculant is integrated with electro-neutralization of the Al<3+> to the particles, an adsorption bridging function of the chitosan, and the effects of increasing the density of flocculated matters and accelerating deposition, so that the ternary composite flocculant is suitable for alga or turbidity removal of various eutrophic water bodies.

The invention discloses an antibacterial finishing agent, an antibacterial yarn and a preparation method and application of the antibacterial yarn. The antibacterial finishing agent is prepared from the following components in parts by weight: 5-20 parts of antibacterial agent, 5-25 parts of a cationic colouring stabilizer, 10-30 parts of a cationic softener and 10-30 parts of water-based resin, wherein the antibacterial agent is selected from at least one of N-dodecyl-amino glycine betaine-2-cysteamine hydrochloride, 3-trimethoxysilylpropyl octadecyldimethyl-ammoniu chloride, chitosan biguanidine hydrochloride, polyhexamethylene biguanidine hydrochloride and ammonium dihydrogen phosphate; and the water-based resin is selected from at least one of vinyl acetate emulsion resin, polyvinyl alcohol resin, polymethylacrylic acid and polyethylene oxide. The water-based resin adopting the components is capable of improving the hand feeling and the comfort of the yarn; and through common action of the cationic colouring stabilizer, the cationic softener, the water-based resin and the antibacterial agent at the ratio, the yarn has good antibacterial property, the requirements of performance, such as the color fastness and the hand feeling comfort are coordinated, and meanwhile, the antibacterial property, the color fastness and the comfort of the yarn are ensured.

The invention discloses a method for preparing bioactive peptide from immobilized bi-enzyme of composite carrier magnetic nano-particles. The method includes the steps of (1) preparing Fe3O4 magnetic nano-particles, (2) preparing chitosan solution and sodium polyphosphate solution and mixing the two to obtain a composite carrier solution, adding in the Fe3O4 magnetic nano-particles with stirring, carrying out magnetic separation, washing with water and then drying to obtain composite carrier magnetic nano-particles, (3) preparing bi-enzyme solution of alkaline protease and trypsin, adding in the composite carrier magnetic nano-particles with stirring, then adding in glutaraldehyde aqueous solution dropwisely, carrying out a cross linking and adsorption method to obtain the immobilized bi-enzyme of the composite carrier magnetic nano-particles, and (4) preparing a plant-caused protein solution, adding in the immobilized bi-enzyme to obtain the bioactive peptide. The method has the advantages of environmental friendliness and low cost, completely takes full advantages of composite of two types of proteases, and improves yield and antioxidant activity of the bioactive peptide. The immobilized bi-enzyme of the composite carrier magnetic nano-particles is small in particle size and is of superparamagnetism.

The invention discloses a method for high-efficiency extraction of pumpkin pigments. The method is characterized by comprising the following steps: (1) extraction of pumpkin solution; (2) flocculation clarification; (3) enzymolysis reaction; (4) filtering treatment; (5) acylation reaction; and (6) preparation of pigment of 40 color value. According to the method, chitosan is used as a flocculation clarification agent, the yield of the product can be relatively improved, and the production cost is reduced; polyethylene glycol is used as the auxiliary solvent, the problem of poor solubility of the red pigments of natural pumpkin is well solved; due to reasonable addition of tartaric acid and ferulic acid, the problem of the stability of the finished product of the red pigment of pumpkin is solved; the adoption of the ultrafiltration technology can meet the needs of large-scale actual production; based on the method, the utilization rate of the raw material is high, the red pigment of pumpkin prepared according to the method not only has high color ratio but also has better properties, purity, stability and solubility and high comprehensive performance price ratio.

The invention provides a high-adsorption polylactic acid composite biofilm carrier material, which is prepared from the following raw materials by weight: 8-10 parts of diatomaceous earth, 14-18 partsof polylactic acid, 0.3-0.4 part of graphene oxide, 4-6 parts of cassava starch, 2-3 parts of gum arabic, 40-50 parts of polypropylene, 8-12 parts of chitosan, 2-4 parts of nanometer carbon sol, 3-5parts of lignocellulose, 1-2 parts of bentonite, 1-2 parts of hexadecyl trimethyl ammonium bromide, 0.5-1.5 parts of silica sol, 0.3-0.5 part of sodium humate, and 15-20 parts of water. The inventionfurther provides a preparation method of the high-adsorption polylactic acid composite biofilm carrier material. According to the present invention, the high-adsorption polylactic acid composite biofilm carrier material has advantages of light weight, large surface activation area, rich carbon source and low influence of environmental temperature change on adsorption performance; and the filler prepared from the high-adsorption polylactic acid composite biofilm carrier material has advantages of good fluidity, less agglomeration, good adsorption performance, corrosion resistance, duration, high efficiency and the like so as to further improve the water purification effect.

The invention provides a preparation method of a pH-responsive quick self-repairing collagen-based hydrogel with adhesivity, antibiosis and pressure resistance. The preparation method comprises the following steps: S1, weighing PEG 2000, 4-formylbenzoic acid and dimethylaminopyridine, dissolving in tetrahydrofuran, adding N, N'-dicyclohexylcarbodiimide in a nitrogen atmosphere, stirring, and then filtering to obtain a white solid; dissolving the white solid in tetrahydrofuran, precipitating in diethyl ether, drying to obtain DA-PEG, and dissolving in water to prepare a DA-PEG solution; S2, weighing and mixing a prepared collagen solution with a chitosan solution, wherein the mass ratio of the collagen solution to the chitosan solution is 3: 1-1: 3 to obtain a collagen/chitosan mixed solution; S3, adding a DA-PEG solution into the collagen/chitosan mixed solution under an ice bath condition to prepare a collagen/chitosan/DA-PEG mixed solution, adjusting the pH value to be 3.6-4.8, and uniformly mixing; and standing to obtain the pH-responsive quick self-repairing collagen-based hydrogel with adhesiveness, antibiosis and pressure resistance.

The invention discloses a preparation method of double-response hydrogel ink. The method specifically comprises the steps of: firstly, preparing acryloylated F127, polymerizing and crosslinking the acryloylated F127 by using free radicals, then preparing a methacryloylated quaternary ammonium salt chitosan solution, then dissolving the cross-linked acryloylated F127 in water, adding the methacryloylated quaternary ammonium salt chitosan solution, conducting uniform stirring, adding a photoinitiator, conducting heating, and finally conducting light initiating cross-linking by using 405 nm lightof 5-10 W to prepare hydrogel, so as to obtain the double-response hydrogel ink. According to the method, chemically cross-linked F127 micelles are formed by pre-cross-linking acrylated F127, and after the chemically cross-linked F127 micelles are assembled with micellizable methacrylated quaternary ammonium salt chitosan, reversible temperature-sensitive hydrogel can be obtained, and the sol-geltransformation temperature of the reversible temperature-sensitive hydrogel can be adjusted between 28 DEG C and 40 DEG C, the mechanical strength of the gel can be adjusted and controlled through photoresponse, and the microenvironment mechanical requirements for repairing skin, cartilages and other tissues are met.

The invention provides a preparation method and application of a chitosan-g-poly(epsilon-caprolactone) derivative drug-loaded nano-micelle. According to the invention, chitosan and a poly(epsilon-caprolactone) derivative provided are used for the drug-loaded nano-micelle; the preparation method is simple in process and convenient in operation; a drug with poor water solubility can be encapsulatedand conveyed, the systemic toxicity of the drug is reduced, the biocompatibility of a carrier is improved, and the curative effect of the drug is improved; and the chitosan-g-poly(epsilon-caprolactone) derivative drug-loaded nano-micelle disclosed by the invention has hydrophobic groups and hydrophilic groups which are easily degraded in a living body, can be used as a novel drug-loaded nano-micelle, has a wide substantive application scope, and has very important practical value for treating tumors.

The invention belongs to the field of drug preparations and in particular relates to a povidone-iodine solution as well as a preparation method and an application thereof. The povidone-iodine solution disclosed by the invention is coated with chitosan and lambda-carrageenan outside povidone-iodine, can stably exist in a water body, has long acting time and has low requirements on conditions such as the pH value of the water body; the povidone-iodine solution is capable of slowly releasing molecular iodine so as to achieve a long-acting antibacterial effect; the method for preparing the povidone-iodine solution in the invention is simple, easy to operate and applicable to industrial production; and the povidone-iodine solution can be used for aquaculture and has high aquatic product survival rate.

The invention discloses a novel charged nanofiltration membrane for removing organic matter and a preparation method of the novel charged nanofiltration membrane. The preparation method comprises the following steps: (1) dissolving polysulfone resin into a mixture of DMF and ethylene glycol, and conducting stirring and degassing to obtain a resin membrane casting solution; (2) coating a non-woven fabric with the resin membrane casting solution, and performing phase inversion in deionized water to form pores, so as to obtain a porous polysulfone-based membrane; (3) preparing any one of a disodium hydrogen phosphate-citric acid buffer solution, a citric acid-sodium citrate buffer solution or an acetic acid-sodium acetate buffer solution; (4) adding chitosan, a piperazine monomer and an anti-pollution additive into the buffer solution, and uniformly conducting stirring to obtain a water-phase solution; (5) mixing trimesoyl chloride and isophthaloyl chloride, adding the mixture into an organic solvent, and uniformly conducting stirring to obtain an oil phase liquid; (6) cutting the porous polysulfone-based membrane, soaking the porous polysulfone-based membrane in the water-phase liquid, and removing the water-phase liquid on the surface of the porous polysulfone-based membrane after soaking; (7) conducting polymerizing in the oil phase liquid after soaking; and (8) after polymerization, conducting drying to obtain the novel charged nanofiltration membrane for organic matter removal.

The invention disclose a tyrosine-sensing electrochemical working electrode, in particular relates to a tyrosine-sensing electrochemical working electrode based on a molybdovanadophosphoric heterpolyacid-doped carbon nanotube / chitosan-copper chelate, belongs to the technical field of electrochemical sensors, and aims at solving the problems of narrow linear ranges, low sensitivity and high preparation cost of tyrosine detection non-enzyme electrochemical sensors in the prior art. The tyrosine-sensing electrochemical working electrode comprises an ITO electrode and a PEI / [P2Mo16V2-MWCNTs /CTS-Cu]n film externally coating the ITO electrode, a molybdovanadophosphoric heterpoly acid-doped carbon nanotube / chitosan-copper chelate layer is a cycle, the number of the cycles is n, and n = 1-10. The electrochemical sensor constructed based on the working electrode has good tyrosine sensing property, the linear range is 4.99 * 10<-8>M-6.88 * 10<-5>M (M:mol / L), and the sensitivity is 0.206 mu M /mu A.