156 results about "Chitosan coating" patented technology

The invention discloses a modified magnetic biochar adsorbing material and application thereof. The adsorbing material is prepared through the following steps: taking agricultural waste corn stalks as a raw material, magnetizing and carbonizing the raw material, and adhering chitosan coating to the surface of the raw material. The adsorbing material is wide in raw material source, stable in structure, low in possibility of blocking, high in efficiency of effectively removing typical heavy metal pollutants namely cadmium ions and copper ions in water, convenient to separate, recycle and reuse and free of secondary pollution, achieves resource utilization, and has good environmental benefits and economic benefits.

The invention discloses a sustained-release compound fertilizer and a preparation method thereof. The sustained-release compound fertilizer is prepared from the following raw materials in parts by weight: 20 to 30 parts of urea, 30 to 40 parts of monoammonium phosphate, 5 to 10 parts of calcium superphosphate, 10 to 15 parts of potassium chloride, 1 to 2 parts of zinc sulfate, 1 to 2 parts of manganese sulfate, 2 to 3 parts of ferrous sulfate, 0.5 to 1.5 parts of borax, 3 to 5 parts of humic acid, 8 to 12 parts of modified clay and 4 to 6 parts of chitosan coating agent. The fertilizer has high sustained-release performance, double good functions of pest killing and water retention, high and long-lasting fertilizer efficiency and high nutrition utilization rate, a coating material is easy to degrade, pollution is completely avoided, the rapid growth of crops can be promoted, the stress resistance of the crops can be improved, the ecological balance of soil can be adjusted, the quality of agricultural products can be improved, and both production and income of the agricultural products are increased. Sources of the raw materials are extensive, and a production process is simple, convenient to operate, low in equipment investment, low in cost and applicable to industrial production, and has a broad market prospect.

The invention discloses a hydroxyapatite / chitosan composite coating and a preparation method thereof. The preparation process mainly comprises the following steps of: (1) preparing liquor containing chitosan, calcium ions and phosphate anions; (2) based on biomedical metal as a matrix, preparing a chitosan coating containing calcium ions and phosphate anions by a dipping-pulling method; and (3) converting the chitosan coating containing calcium ions and phosphate anions to the hydroxyapatite / chitosan composite coating by a biomineralization method. The coating prepared by the invention adequately combines advantages of the biomedical metal matrix, hydroxyapatite and chitosan. With the biomedical metal matrix, the coating has stronger mechanical property. With a porous structured formed by sequentially arranging sheet hydroxyapatite, the coating has good biocompatibility. Chitosan organic matters are introduced, so that not only is the binding capacity of hydroxyapatite and the metal matrix remarkably improved, but also the coating material is endowed with the antibacterial performance.

The invention discloses an edible compound coating antistaling agent for drupes. The edible compound coating antistaling agent belongs to the field of fresh preservation and treatment of fruits and vegetables and is characterized in that chitosan and other auxiliaries are dissolved in a water solution prepared in an acetic acid solution with low concentration. According to the invention, glycerylmonostearate and Tween 80 are added in chitosan coating, thus the connecting strength of antibacterial components is enhanced and, the toughness and air permeability of the coating are improved; and meanwhile, other components in the fresh preservation agent, such as sodium ascorbate, sodium chloride, and the like, have greater bacterial resistance and fresh preservation effects. The edible compound agent, after being applied to coating the drupes, can form a layer of shiny transparent film on the surface of each drupe and achieves the functions of preserving water, reducing bacterial contamination, preventing the growth of microorganisms, resisting oxidation and inhibiting the fruit respiration. The edible compound agent can be widely applied in the storage and fresh preservation of the drupes and achieves greater fresh preservation effects than other methods. The edible compound agent is convenient to prepare and use, requires small equipment investment, occupies a small operation area, and is suitable for industrial batch production.

The invention discloses a thermoplastic degradable fiber woven stent having a chitosan coating. The thermoplastic degradable fiber woven stent is prepared by the following steps: weaving degradable fiber into a tubular object with a net structure; bonding fibers in the tubular object at intersecting points via a thermal treatment or thermal press-bonding method, to prevent fiber looseness and endow the stent with high radial supporting force; coating the tubular object with a chitosan-acetic acid-water solution, and placing in anhydrous ethanol to form a chitosan coating; and removing ethanol in a vacuum drying oven. The obtained stent is high in radial supporting force, and can be completely degraded in vivo.

The invention relates to a plant preservation technology, in particular to a coating preservation method for fresh ma bamboo shoots. The bamboo shoot preservative comprises 0.05-0.1% of water solution of salicylic acid and 1.0-1.5% of chitosan coating liquid by mass. Cleaned bamboo shoots are soaked in the bamboo shoot preservative, and the soaked bamboo shoots are dried. The method for preserving bamboo shoots by using the bamboo shoot preservative comprises the following specific steps of: soaking cleaned bamboo shoots in the bamboo shoot preservative, and drying the soaked bamboo shoots. The bamboo shoot preservative has the advantages of prolonging the storage period of fresh ma bamboo shoots by 20-40 days, reducing the disease incidence by 20-40% lower than untreated bamboo shoots during the bamboo short storage period, reducing lignin accumulation by 20-50%, reducing the residue of chemical agents caused by using bactericides and the like and being safe in use. In addition, the method provided by the invention is simple and easy to popularize and apply.

The invention relates to an edible plant source fresh-cut fruit and vegetable coating film preservative. The edible plant source fresh-cut fruit and vegetable coating film preservative is prepared from the following components in percentage by weight: 3 to 10 percent of fresh ginger extracting liquid, 0.2 to 0.5 percent of low-molecular chitosan, 2 to 5 percent of citric acid, 0.03 to 0.1 percent of tea polyphenol, 0.01 to 0.1 percent of resveratrol, and the balance of deionized water, wherein the sum of the components in percentage by weight is 100%. The edible plant source fresh-cut fruit and vegetable coating film preservative has the advantages that by adding the antioxidants of the tea polyphenol, the resveratrol, the citric acid and the like into a chitosan coating film, the browning speed of fresh-cut fruits and vegetables is effectively decreased, the storage time of the fruits and the vegetables is effectively prolonged, and the activities of various antioxidant active matters and antioxidant enzymes in the fruits and the vegetables are improved; the added biological antioxidants have no poison and harm, and can be eaten, the injury to a human body is avoided, and the preserving effect is better.

The invention relates to a food coating preservative containing water-soluble soybean polysaccharides. The preservative can also contain an enhancer, a plasticizer and other auxiliary components. Thepreservative has good film-forming property and antibacterial property, compared with the coating preservation for eggs which is carried out by using chitosan coating liquid and paraffin coating liquid, a water-soluble soybean polysaccharide coating has the advantages of lower water permeability rate, better preservation effect, a wide range of sources of raw materials, low production cost and edible safety.

The invention relates to a refrigerated blueberry chitosan coating fresh-keeping method, belonging to the technical field of fresh keeping of agricultural products. A chitosan coating fresh-keeping agent comprises the following components in percentage by mass: 3% of water soluble chitosan, 0.75% of glycerol, 0.25% of Sapn 40, 5% of high fructose corn syrup, 3% of high methoxy pectin and 88% of distilled water. Fresh blueberries are pretreated, coated with the chitosan coating fresh-keeping agent and refrigerated to achieve the effect of keeping fresh. With the coating fresh-keeping method, the change of flavor and color and the loss of nutrients for blueberries in the refrigeration and thawing period can be slowed down, especially the problems of texture hardening and juice loss are solved, a new and effective fresh keeping approach is provided for refrigerated blueberries, the quality of the refrigerated blueberries can be obviously improved, and the economic benefit can be increased.

The invention discloses a preparation method of a magnetic chitosan compound adsorbent. The preparation method comprises: preparing a compound magnetic carrier Fe3O4@Al2O3 and carrying out chitosan coating on the compound magnetic carrier Fe3O4@Al2O3; meanwhile, carrying out glutaraldehyde cross-linking and thiourea modification on chitosan to prepare the magnetic adsorbent Fe3O4@Al2O3-CS. When the adsorbent is used for adsorbing Cr(VI), the concentration of a Cr(VI) solution is 0.5mg / L to 100mg / L and the pH (Potential of Hydrogen) value is 1 to 3. The adsorbent prepared by the invention has common properties of a magnetic core (with a rapid magnetic separation function) and the chitosan (with abundant surface functional groups), and has relatively good cyclic regeneration and adsorption performances on the Cr(VI); the adsorbent also has excellent selective adsorption performances on the Cr(VI) in a mixed cation solution containing the Cr(VI), Cu(II), Zn(II), Mg(II), Cd(II) and Ni(II).

The invention discloses a chitosan coating medicine slow release microsphere and a preparation method thereof. The chitosan coating medicine slow release microsphere comprises a condensate capsule shell of chitosan and glutaric dialdehyde, core medicine resveratrol, oxidative resveratrol, pterostilbene or white cedar alcohol, wherein the core medicine resveratrol, the oxidative resveratrol, the pterostilbene or the white cedar alcohol are coated into the capsule shell. The preparation method is simple and easy, the preparation cost is low, the microsphere envelop rate is 10-50 percent, the microsphere is round and has good dispersivity, the stability of the original medicine is increased, and the chitosan coating medicine slow release microsphere realizes the function of medicine slow control and release and can be conveniently matched with other medicines. The chitosan coating medicine slow release microsphere is suitable for preparing a slow release formulation of medical resveratrol, oxidative resveratrol, pterostilbene and white cedar alcohol.

The invention provides a preparation method of a hydrophilic and antistatic polyester fiber. The preparation method comprises the steps that a carbonic acid solution is adopted as a solvent of chitosan gel, and chitosan is applied to the surface of a polyester fiber; a stable graphene oxide-chitosan coating is formed on the surface of the polyester fiber through interaction between graphene oxide and the chitosan; after washing and drying are conducted, the hydrophilic and antistatic polyester fiber is obtained. According to the preparation method, carbonic acid is adopted as the solvent of the chitosan, a chitosan film can be directly formed to be deposited on the surface of the polyester fiber through heating, and a solvent removing step is not needed; the polyester fiber with the chitosan film and the graphene oxide have a high bonding effect; the prepared chitosan-graphene oxide-polyester fiber has the very good hydrophily and antistatic property. The green chemical preparation method is simple in preparation process, environmentally friendly and low in equipment requirement and has a wide application prospect.

The method for covalent linkage of chitosan on surface of base material includes the following steps: bonding nitrine group on the chitosan, casting the triazo-containing chitosan solution on the base material to form chitosan coating layer containing nitrine group, under the irradiation of UV light photolyzing nitrine group into carbene, making carbene ane base material produce insertion reaction to make chitosan chain produce crosslinking reaction so as to make chitosan bond on the surface of base material. The preparation method of triazo-containing chitosan solution includes the following steps: adding chitosan powder, dicyclohexylcarbimide and 4-azidobenzoic acid into organic solvent stirring, filtering, washing with methyl alcohol or dichloromethane, filtering, drying to obtain triazochitosan, then dissolving it in mixed solvent of dilute acetic acid and glycol methyl ether.

The invention provides a preservation technology for bamboos eaten by pandas, and belongs to the technology field of fresh bamboo preservation. The preservation technology comprises following steps: soaking the bamboo incisions in chitosan coating plastics with a concentration of 0.5 to 2.0%, drying with cold wind then diagonally placing the fresh bamboos with the incisions upward placed at the temperature of 2 to 6 DEG C, steaming the fresh bamboos for 30 to 40 hours with a steaming agent 1-methylcyclopropene with a concentration of 0.5 to 2.0 [mu]L / L, and then storing the fresh bamboos for 15 to 45 days at the refrigeration temperature of 2 to 6 DEG C after the steaming is over. The preservation technology for bamboos eaten by pandas solves the problems that the loss of unique flavors of color, fragrance, taste, and crisp which is caused by the application of chemical preservation technology on bamboos eaten by pandas, and safety hazards existed in conventional chemical antiseptic preservation method, has the advantages of no toxicity, no harm, green, health, strong operability and simple method, and is capable of effectively prolonging the expiration date of the bamboos, and maintaining the original flavor of the bamboos.

The invention discloses a method for preparing a composite shellfish toxin adsorbent by coating porous shell particles with chitosan. The method comprises the steps of conducting diluted acid washing and water washing on shells (fan shells, oyster shells, clam shell and the like) with shellfish meat removed to remove dirt on the surfaces of the shells, conducting stoving, electric furnace firing, high-temperature calcination, smashing and screening to obtain shell particles, soaking the shell particles in chitosan / acetic acid solution with certain concentration, and conducting draining and vacuum drying to obtain the composite adsorbent with chitosan coatings formed on the inner bore walls of the shell particles and on the surfaces of the particles. The invention further discloses a method for adsorbing shellfish toxins in aquatic products by means of the composite adsorbent and a method for regeneration of the composite adsorbent. By the adoption of the method for adsorbing shellfish toxins in aquatic products by means of the composite adsorbent, shellfish toxins can be removed efficiently, so that polluted aquatic products can be utilized and environment pollution can be reduced.

The invention discloses a compound of molecular beacons for diagnosing lung cancers. The compound comprises a magnetic nano microsphere and the molecular beacons adsorbed on the magnetic nano microsphere. The compound is characterized in that acc+Cct+Atca+Cgat+Tagcattaa is a circular sequence; the basic groups expressed with capitals in the circular sequence are the basic groups treated through locked nucleic acid modification; and the magnetic nano microsphere comprises magnetic nanoparticles and chitosan coating the surfaces of the magnetic nanoparticles. The compound has the beneficial effect of overcoming the defect that the molecular beacons in the prior art easily generate false positive signals during living cell detection and can resist degradation of nuclease in the living cells and detect miR-155 in the living cells, thus realizing diagnosis and differential diagnosis of the lung cancers.

The invention discloses a method for improving the water holding capacity of fresh and tender fish balls and prolonging the refrigeration shelf life of the product. The method comprises the steps of chopping, wherein semi-unfrozen minced fillets are cut into small pieces, ice water is added, and chopping is carried out; slat chopping, wherein salt is added, and chopping is carried out; mixing chopping, wherein an exogenous additive is dissolved in a small amount of water, then the dissolved exogenous additive is added into the minced fillets, and chopping is carried out; forming, wherein a fish ball forming machine is used for forming; gelatinization, wherein gelatinization is carried out by adopting a two-stage heating method; cooling, wherein gelatinized fish balls are put in cold waterfor cooling; chitosan coating, wherein the fish balls are put and soaked in a glycan solution for film coating; packaging, wherein vacuum packaging is carried out on the fish balls by adopting a boiling bag; thermal sterilization treatment and refrigeration are carried out. The invention provides a method for improving the quality of the high-moisture fresh and tender fish balls and prolonging thestorage period. The prepared product is pure white in color, fine, smooth, soft and tender in taste, and convenient to eat, not only meets the needs of modern consumers for convenient and fast products, but also is more conductive to achieving industrial production of traditional minced fillet products.

The invention relates to an antibacterial alginate composite functional dressing and a preparation method thereof. The dressing is prepared from alginate, sodium carboxymethylcellulose, chitosan and a guanidine antibacterial agent and has good biosecurity, bleeding stopping performance and antibacterial performance. The preparation method comprises the steps as follows: firstly, sodium alginate and sodium carboxymethylcellulose are dissolved, the solution is extruded into a calcium ion coagulating bath via spinneret orifices, and fiber filaments are formed; then, a chitosan solution is prepared, and prepared alginate fiber is subjected to chitosan coating; next, a guanidine antibacterial agent solution is prepared and the fiber is impregnated in the guanidine antibacterial agent solution; finally, composite fiber is subjected to combing, needling and hot rolling treatment, cutting, packaging and sterilization are performed, and the dressing is prepared. The preparation method is simple and low in production cost. The prepared antibacterial alginate composite functional dressing has good antibacterial performance and can meet wound bleeding stopping, antibacterial and healing promoting requirements.

The invention discloses a preparation method of a chitosan-polysulfone hollow fiber membrane. The method is characterized by comprising the following steps: firstly, preparing chitosan coating liquid and a cross-linking agent solution; soaking a polysulfone hollow fiber membrane by sodium dodecyl benzene sulfonate water solution, polyethylene glycol ether water solution or octyl phenol polyoxyethylene ether water solution, washing the soaked fiber membrane by distilled water, and airing the fiber membrane at room temperature for standby application; after that, soaking the polysulfone hollow fiber membrane into the chitosan coating liquid, vacuumizing a membrane filament inner tube, then pulling a membrane filament out of the chitosan solution, and drying the membrane filament; finally, soaking the membrane filament coated with the chitosan into the cross-linking agent solution, carrying out reaction for a period of time, then taking out the membrane filament and drying under the nitrogen atmosphere to obtain the chitosan-polysulfone hollow fiber membrane. The preparation process of the composite membrane is simple and high in controllability. The method is rich in material source, low in price, low in cost of membrane preparation, non-toxic in the membrane preparation process and environment-friendly.

The present invention provides a strawberry preservation method, including the following steps: strawberries are put into a chitosan solution to conduct coating treatment; the coated strawberries are put into a preservation box, and preservation gases are filled into the preservation box and comprise 5%-10% of oxygen, 8%-10% of carbon dioxide and the balance being nitrogen; the strawberries placed within the preservation box are subjected to low-temperature treatment until the core temperature of the strawberries turns to 4-6 DEG C; and the preservation box is placed in an incubator for storage. The preservation method treats the strawberries with chitosan coating, preservation box packaging, preservation gas modified atmosphere, and core temperature reducing, and the preservation period and shelf life are extended during the transportation or sales of the strawberries. Experimental results show that the preservation method for the strawberries enables the commodity of the strawberries to be kept for more than seven days at a temperature of 25 DEG C or below without mechanical damages; and enables the commodity of the strawberries to be kept for 4-7 days at room temperature of 25-30 DEG C of storage.

The invention discloses a preparation method of a phenolic acid-modified chitosan coating liquid for fresh keeping of edible fungus. According to the preparation method, mainly chitosan and protocatechuic acid molecules are adopted as reaction substrates, and a chitosan-protocatechuic acid grafted copolymer is synthesized by using an EDC-mediated cross-linking reaction. According to the present invention, the synthesis process is simple, and the obtained chitosan-protocatechic acid grafted copolymer has characteristics of good water solubility, high grafting rate and high antioxidant activity, and can significantly improve the storage quality of edible fungus and prolong the shelf life; with the preparation method, the problems of poor water solubility, low oxidation activity and the like of the chitosan can be solved so as to improve the performance of the chitosan and expand the application in the storage and the fresh keeping of food; and the method is less investment, is suitable for large-scale production, and has excellent application prospect.

The invention discloses a textile chitosan coating additive with color gradual changeability along with time passing and a preparation method thereof. The composition comprises, by weight, 140-180 parts of high-molecular chitosan, 140-180 parts of chitosan fibers, 3-5 parts of sodium alginate, 4-5 parts of ethylene diamine tetra(methylene phosphonic acid), 4-5 parts of hyaluronic acid, 5-6 parts of a pigment 1, 5-6 parts of a pigment 2, 0.1-0.3 parts of nanometer TiO2, 3-5 parts of a TPP ion cross-linking agent, 2-3 parts of a hydrophobic essence material, 1-2 parts of alpha-oxoglutarate and a proper amount of water. Different chitosans coat different pigments and the coated product is used as a textile dye additive. Chitosan is degraded along with time passing and the textile color is gradually changed so that the dual purposes are realized and textile color diversity and durability are realized.

The invention discloses a medical intestinal anastomosis ring made of a degradable magnesium alloy, and relates to the field of medical apparatus and instruments and the medical intestinal anastomosis ring is used for solving the problem that the existing intestinal anastomosis material is not degradable. The medical intestinal anastomosis ring is made of a degradable magnesium alloy, and a poly lactic-co-glycolic acid copolymer coating or modified chitosan coating is coated on the surface medical intestinal anastomosis ring. Mg<2+> in the degradable product of the medical intestinal anastomosis ring is the second important positive ion in human cells and is harmless to a human body. The medical intestinal anastomosis ring is in contact type anastomosis, avoids damage to intestinal wall by suture or metal nails, cause less tissue wounds, is minium in the tissue necrosiss degree of the whole anastomosis stomas, can be degradable after being implanted in a human body for 2-3 weeks, and has no permanent foreign body reaction, thus effectively reducing scars at the anastomosis stomas, thereby having low stenosis incidence rate of the anastomosis stomas.

The invention discloses a health environmentally-friendly lining paper for cigarettes. The health environmentally-friendly lining paper comprises a lining paper (1), a barrier layer (2) coating the surface of the lining paper (1) and a chitosan coating (4) coating the barrier layer (2). The chitosan coating mainly comprises high-density chitosan, can improve human immunity and can produce auxiliary treatment effects on diseases. Chitosan has good moisture retention, film forming ability, antibacterial activity and good mechanical strength, can adsorb tar and nicotine and has effects of keeping lubrication, improving a fragrance and improving a smoking taste.

The invention relates to a preparation method for a sustained-release and controlled release compound fertilizer suitable for field crops and belongs to a mixed fertilizer which can control the releasing rate of nutrition components. The preparation method is characterized by comprising two critical processes which is melting granulating and revolving drum coating; firstly, built-in sustained-release compound fertilizer particles are prepared by the melting granulating; then the compound fertilizer is prepared by heteroallelic particle variable speed and the revolving drum coating; the compound fertilizer comprises the following raw materials according to the weight percentage: 35-65 of urea, 9-36 of monoammonium phosphate or heavy calcium, 8-40 of potassium chloride or potassium sulphate, 1-38 of pelleting accessory, 3-5 of nanoscale chitosan improved concave-convex soil and 1-2 of nanoscale chitosan coating agent. The invention provides the preparation method for the sustained-release and controlled release compound fertilizer applied in the field crops, which can control the releasing rate of the fertilizer efficiency according to the requirement of different stages of the crop growth on the nutrition and provides the timing and defined amount of nutrition for the growth of the crops and has high fertilizer utilization rate; the coating material is easily degraded and is beneficial to the environment protection.

The invention relates to the technical field of healthcare food, and particularly discloses a chitosan-coating sweet-scented osmanthus phenylethanoid glycosides lipidosome and a preparation method ofthe chitosan-coating sweet-scented osmanthus phenylethanoid glycosides lipidosome. The preparation method adopts soybean lecithin and cholesterol as film materials, adopts an ethanol injection methodto prepare the osmanthus phenylethanoid glycosides lipidosome, and utilizes the chitosan to modify the lipidosome, thereby obtaining the chitosan-coating sweet-scented osmanthus phenylethanoid glycosides lipidosome. The embedding rate of the chitosan-coating sweet-scented osmanthus phenylethanoid glycosides lipidosome prepared by the invention is 35.04 to 88.10 percent, and a particle size is 74.14 to 116.47 nm. The stability of the sweet-scented osmanthus phenylethanoid glycosides is improved, and the sweet-scented osmanthus phenylethanoid glycosides has a sustained release effect.

The invention provides a preparation method of a nano silver wire-chitosan self-assembly conductive film coating. According to the method, a layer-by-layer self-assembly method is utilized to combinenano silver wires with a chitosan coating on the surface of a substrate material for forming a conductive film with high stability. Through the multi-layer self-assembly, the uniform distribution degree of the nano silver wires on the substrate material can be enhanced, and meanwhile, the conductivity of the conductive film can be improved. The method can be used to prepare the nano silver wire conductive film coating with high stability on the surface of a plurality of substrate materials.

A method of electrochemical deposition includes submerging a stainless steel surface of an object in a chitosan solution and applying a first electric potential between the submerged stainless steel surface and the chitosan solution for a predetermined time to form a chitosan surface coating. After rinsing and dehydrating, the chitosan coated surface is submerged in a solution having a predetermined concentration of a noble metal nitrate and a second electric potential is applied between the chitosan coated surface and the solution of the noble metal nitrate to deposit noble metal particles on the chitosan surface coating.

This invention relates to a composition characterized by containing, as essential components, deacetylated chitin and / or a deacetylated chitin derivative, and glyoxylic acid; a solution-containing gel formed from the composition; a water-insoluble chitosan coating; and a material obtained by treating a base material with the composition. According to the present invention, it is possible to provide a chitosan composition, which in a “one-pack” form, has a pot life. Even when dried at room temperature after coating or impregnation of a base material, the chitosan coating can be water-insolubilized with reduced yellowing.