454 results about "Biopolymer" patented technology

The invention belongs to the technical field of electrolyte materials, and particularly relates to a pH response biopolymer solid electrolyte as well as a preparation method and application thereof. The pH-responsive degradable biopolymer is taken as a main raw material, and one or more functional groups such as pyridine, sulfonic acid, carboxyl, tertiary amine, phosphoric acid and the like are contained. The organic acid and the organic acid salt are selected to adjust the pH value of a medium around the electrolyte, and the contraction / stretching behavior of a molecular chain is influenced by changing the ionization degree of the electrolyte, so that an interpenetrating polymer network structure is formed. The polar functional group of the biopolymer affects the migration behavior of lithium ions under different pH conditions, so that the migration rate and migration quantity of the lithium ions are increased, and the cycle performance of the battery is improved. The electrolyte is suitable for high-performance energy storage devices such as a lithium ion battery, can effectively improve the battery performance, reduces the environmental pollution, and has relatively strong green and environment-friendly advantages.

The invention discloses a gas separation membrane and a preparation method thereof, and belongs to the technical field of gas separation membranes. The gas separation membrane comprises a separation layer comprising a network and PTI nanosheets dispersed in the network, the network comprising at least one of a biopolymer network and a chemical polymer network; selectively, the device further comprises a supporting layer which is arranged below the separation layer and is combined with the separation layer. The preparation method of the gas separation membrane comprises the following step A or step B: step A: enabling raw materials of PTI nanosheets and networks to form a membrane on the surface of polymer hydrogel to obtain the gas separation membrane; and step B, enabling the PTI nanosheet and the network raw material to form a membrane on the surface of the material of the support layer to obtain the gas separation membrane. The gas separation membrane provided by the invention is an N2 preferential permeation membrane, and has relatively high N2 permeation rate and relatively high N2 / CO2 selectivity.

The present disclosure generally relates to compositions and methods of simultaneously making two unique biointermediates from a single lignocellulosic biomass feedstock, including a hydrophobic biohydrocarbon and a water insoluble hydrophilic cellulosic biopolymer for use in the production of renewable fuels, chemicals, and other carbon neutral materials commonly derived from petroleum and other fossil resources.

Method for generating a porous injectable scaffold that includes providing a liquid composition of 2 phases at a temperature below 25° C., of Newtonian behavior, where the composition comprises:a liquid dispersant phase at room temperature formed by a gelatin with a low melting point, less than 15° C., functionalized with methacryloyl or methacrylamide groups; and a photoinitiator;and a dispersed phase, of microdroplets or beads in solid state, of a gelatin solution with a melting point greater than 25° C.;initiating the polymerization of the dispersing phase by light radiation; raising the temperature to 35-40° C. and allowing melting of the dispersed phase; and obtaining a porous scaffold.The formed porous scaffold and its use as a biological support for tissue regeneration / generation; as a biological matrix as a support for cells, for cell invasion; as an acellular biological matrix, a biological matrix as a mechanical support and / or a biological matrix for active components.

A biaxially oriented cavitated PHA-rich composite film comprises a PHA-rich core layer and a first outer skin layer and a second outer skin layer. The core layer comprises a PHA resin at an amount of more than 50 wt % of a total weight of the polymeric resin in the core layer and a modifier X, the modifier X includes PLA resins and PLA copolymers and at least one mineral inorganic cavitating agent; the first outer skin layer comprises a PLA resin at an amount less than 50 wt % of the total weight of the outer layer and biopolymers comprising PHA resins or PBSA resins or PCL resins or mixture thereof. The PHA-rich composite film shows a reduced film density and higher yield as well as low light transmission rate.

The invention belongs to the technical field of biomedical materials, and provides a preparation method and application of hyaluronic acid microspheres with a beautifying effect, an aqueous solution dissolved with hyaluronic acid and a cross-linking agent is used as an aqueous phase, an organic solvent solution of a polyester biopolymer material is used as an oil phase, a medical microsphere preparation system is constructed, and the hyaluronic acid microspheres with the beautifying effect are prepared. The preparation method has the advantages that the reaction conditions are mild and controllable, the situation that the dosage of the cross-linking agent is reduced due to leakage of the cross-linking agent in a water phase can be effectively prevented, and meanwhile, the microspheres can be effectively prevented from being adhered or cross-linked and mixed, so that the crosslinking degree of the microspheres is uniform, and the obtained microspheres have higher mechanical strength, good elasticity and excellent enzymolysis resistance, can be maintained in vivo for a longer time, and can be used for preparing the microspheres. Wide application prospects and market values are realized in the fields of drug-loaded microspheres and cosmetic filling.

The invention belongs to the field of microbial fermentation and biopolymer modification, and particularly relates to a preparation method of cross-linked polyglutamic acid and application of the cross-linked polyglutamic acid in microalgae harvesting. The preparation method comprises the following steps: by taking polyglutamic acid fermentation liquor subjected to sterilization, salting-out and redissolving treatment or a solution prepared from polyglutamic acid powder as a raw material, adjusting the pH value to be within a proper range, adding ethanol into the polyglutamic acid fermentation liquor or the solution prepared from the polyglutamic acid powder in proportion, uniformly stirring, collecting pasty precipitate, and weighing; and adding a cross-linking agent into the paste precipitate according to a proper mass ratio of the cross-linking agent to the polyglutamic acid, uniformly mixing, spreading in a drying tray, drying in vacuum drying equipment at a certain temperature to constant weight, crushing by using a crusher, and sieving by using a 40-mesh sieve to obtain a cross-linked polyglutamic acid product. The invention provides another preparation method of the cross-linked polyglutamic acid, the cross-linking reaction and the drying process are fused, the ethanol is used as an accelerant of the reaction, the dosage of the cross-linking agent is small, the product yield is high, the preparation cost is low, and the preparation method is suitable for large-scale production.

Methods of making bioactive compound-loaded nanoparticles are provided. The methods harness naturally-occurring biopolymers to produce nanoparticles from raw plant materials. Methods include contacting plant-derived materials with alkaline solution with agitation to deprotonate the bioactive materials and biopolymers to form nanoparticles. In some forms, the methods contact the nanoparticle with an acid to re-protonate the components and more stable nanoparticles. The bioactive compounds can be extracted from raw plants and / or plant parts, including turmeric, ginger, clove, thyme, pepper, and rosemary. The bioactive compounds include curcumin, gingerols, shogaols, eugenol, thymol, carvacrol, capsaicin, and rosmarinic acid. Compositions and formulations containing bioactive-compound loaded nanoparticles are also provided.

The invention relates to a three-dimensional printing composition comprising a dECM hydrogel-based biomaterial, a hydrogel made of methacrylated PBS biopolymer derivatives with a radical polymerisation photoinitiator, a methacrylated chitosan solution in 1% acetic acid, neutralised to a final concentration of 3.1 mg / ml in the biomaterial, and / or a chitosan solution in 2% acetic acid, neutralised to a final concentration of 1.4 mg / ml in the biomaterial.

The invention belongs to the field of biological materials, and particularly relates to hydroxyapatite nanofiber / biopolymer composite hemostatic sponge capable of rapidly absorbing liquid and expanding as well as a preparation method and application of the hydroxyapatite nanofiber / biopolymer composite hemostatic sponge. The hemostatic sponge is formed by cross-linking and compounding hydroxyapatite nanofibers and biopolymers, the chemical composition of the hydroxyapatite nanofiber is hydroxyapatite, the diameter of the hydroxyapatite nanofiber is 10-100 nm, and the length of the hydroxyapatite nanofiber is 10-500 [mu] m; the biopolymer is one or more of chitosan, carboxymethyl chitosan, hydroxypropyl chitosan, chitosan quaternary ammonium salt, chitosan hydrochloride, hyaluronic acid, alginic acid, gelatin and collagen; the hydroxyapatite nanofiber in the hemostatic sponge accounts for 10wt%-90wt% of the total mass of the sponge. The hemostatic sponge disclosed by the invention has excellent imbibition expansion capacity, relatively high imbibition expansion pressure, good erythrocyte and platelet adsorption capacity and good blood compatibility and biocompatibility.

Novel compositions are described, each comprising at least one active constituent that has a 12-carbon atom backbone as a 12-carbon chain base structure having at least a sub-terminal nitrogen and no terminal amino group. One of the active constituents is Boc-12-Ado-OH (BOA) and / or N,N-dimethyldodecylamine N-oxide (LO). Novel particle or liposomal compositions comprising at least BOA and / or LO may be prepared with an emulsifier and / or lipid and optionally a biopolymer, and may be formulated into pharmaceutically acceptable formulations and / or medicaments with or without one or more pharmaceutically acceptable carriers or excipients for utilization as an antimicrobial against one or more microbial pathogens. The novel antimicrobial compositions have broad-spectrum growth inhibitory or other destructive activity against microbial pathogens, biofilms produced by one or more pathogens, and biofilm infections.

The application provides a silk fibroin microsphere and a preparation method and application thereof, and belongs to the technical field of biopolymer microsphere preparation. The preparation method comprises the following steps: 1) adding an ionic dispersing agent into a silk fibroin solution, uniformly mixing, then adding a sphere forming agent into the solution, and obtaining a pretreated liquid after mixing; 2) performing low-temperature coagulation treatment on the pretreated liquid, and obtaining a silk fibroin microsphere solution after thawing; 3) diluting the silk fibroin microsphere solution, then performing wet heat crystallization treatment, and obtaining a high-crystallinity silk fibroin microsphere solution; and 4) performing spray drying on the high-crystallinity silk fibroin microsphere solution, and obtaining a solid silk fibroin microsphere. The silk fibroin microsphere obtained by the application has excellent biocompatibility, degradability and good mechanical properties. The silk fibroin microsphere prepared by the method of the application is regular spherical, has high crystallinity, slow degradation speed, is not easy to absorb moisture and adhere, and can be stored for a long time; and the preparation method is simple and has high yield.

Provided herein are biopolymers comprising repeating polysaccharide units, preparations of biopolymers, and ophthalmic compositions comprising biopolymers, as well as methods of use.

This invention belongs to the technical field of oil and gas field development and enhanced oil recovery, specifically relating to a bio-based ternary composite enhanced oil recovery system and its preparation method. The bio-based ternary composite enhanced oil recovery system of this invention, by weight, comprises: 800-2000 parts of biopolymer; 600-3000 parts of biosurfactant; 40-400 parts of bionanomaterials; and 200-800 parts of water. In the bio-based ternary composite enhanced oil recovery system provided by this invention, the composite enhanced oil recovery system of biopolymer, biosurfactant, and bionanomaterials fully leverages the synergistic effect of each component, demonstrating significant advantages in improving crude oil recovery and reducing environmental risks, and possessing good industrial application prospects and promotional value.

The present invention is directed to fluorine-free firefighting foams containing one or more biopolymers. The biopolymers of the compositions of the present invention include for example, diutan, guar, xanthan, scleroglucan, and combinations thereof.

The present invention relates to a method for functionalizing a biopolymer having an -OH group or an -NH2 group by reacting the biopolymer with at least one compound having at least one C=C bond or C≡C bond and containing a chromophore that absorbs UV-Vis radiation directly adjacent to this bond. The present invention also relates to a method for obtaining a solid biopolymer material by reversibly crosslinking the functionalized biopolymer obtained by the above method under UV-Vis light irradiation. Furthermore, the present invention relates to the use of functionalized biopolymers as support materials for 3D bioprinting, or as materials for manufacturing structures selected from spheroids, organoids, artificial organs, coatings, and tissue models.

The invention relates to the technical field of medical biopolymer materials, in particular to a two-component gynecological gel spray and a using method thereof.The two-component gynecological gel spray comprises a first component and a second component, and the first component at least comprises formylated multi-arm polyethylene glycol, formylated poloxamer and a solvent; the second component at least comprises a multi-amino polymer solution, the bi-component solution forms a film in the vagina and is cured in situ, and the vaginal gel has the characteristics of strong adhesion and strong corrosion resistance, can act on the vagina for a long time to realize long-acting treatment, and is more convenient to use and better in effect.

To provide a system including novel nanopores having different structures and recognition sites that improve sequencing accuracy and / or provide different error profiles.SOLUTION: Provided are systems relating to the field of nanopores and their use in various applications, e.g., analysis of biopolymers and macromolecules, typically by making electrical measurements during translocation through the nanopore, comprising a funnel-shaped proteinaceous nanopore comprising alpha-helical pore-forming toxins that are members from the actinoporin family of proteins, more particularly Fraga Ceatoxin C (FraC), a variant FraC, a FraC paralog or a FraC homolog.SELECTED DRAWING: None

The invention discloses an excitation wavelength dependent macromolecular super-strong cellulose-based intelligent packaging material and a preparation method thereof. The film material is prepared by doping less than 0.002% (w / w) of a chromophore into a biopolymer. The chromophore is 1-amino anthraquinone or disperse red 60. The biopolymer is at least one of cellulose acetate, starch, chitosan and polylactic acid. Dropwise adding the chromophore solution into the biopolymer solution, and stirring for 0.5-3 hours; and pouring the mixture into a glass plate, placing in a constant-temperature box, evaporating the solvent, and stripping to obtain the film. The excitation wavelength-dependent cellulose-based intelligent packaging film material is applied to manufacturing of OLED (Organic Light Emitting Diode), intelligent electronics and intelligent packaging materials as well as protection of ultraviolet rays and management of visible light.

The article is made from a biodegradable biopolymer.

The present invention relates to a method for improving the airtightness of a building or a room in a building, comprising the use of a vapor barrier membrane on the inner surface of a wall of said building or said room in said building, characterized in that said vapor barrier membrane is a humidity regulating membrane having an active portion, The active moiety is an intermediate layer having a thickness between 2 μm and 200 μm, preferably between 4 μm and 100 μm, and made of a biopolymer having a water vapor permeability coefficient P1, which increases with the average relative humidity and is at least 300 Barrer, measured at 23° C. and an average relative humidity of 25.5%; and on both sides of, preferably in contact with, the intermediate layer; - two outer layers having a thickness of 100 nm to 20 μm, preferably 200 nm to 2.5 μm, each consisting independently of the other of an organic polymer having a water vapor permeability coefficient P2 of at most 250 Barrer, preferably 0.05 to 100 Barrer, in particular 1.0 to 20 Barrer, measured at 23° C. and an average relative humidity of 25.5%; The present invention relates to a method comprising the steps of:

The invention discloses a degradable fruit and vegetable fresh-keeping composite material based on multi-mechanism synergy and a preparation method thereof, and belongs to the technical field of food packaging materials, the degradable fruit and vegetable fresh-keeping composite material comprises the following components by weight: 35-45 parts of a biopolymer matrix, 12-18 parts of mechanical reinforced fiber, 18-25 parts of an ethylene catalytic scavenger, 8-12 parts of a slow-release preservative, 4-6 parts of glycerin, and 1.5-2.5 parts of citric acid; the preparation method comprises the following steps: respectively preparing the ethylene catalytic scavenger and the slow-release preservative; constructing basic gel; the functional components are uniformly dispersed in the gel, and the composite membrane material is prepared through curtain coating, drying, crosslinking and ultraviolet post-treatment. Through collaborative design of carrier loading, molecular embedding and nano-enhancement, efficient removal of ethylene, long-acting slow release of antibacterial and antioxidant activity, remarkable improvement of mechanical properties and unification of all-component biodegradation are realized, the shelf life of fruits and vegetables is effectively prolonged, and the preparation method is suitable for preparation of green packaging products.

The invention relates to a biopolymer asphalt substitute. The biopolymer is non-plant-based. A significant amount of the biopolymer can be included in the blend with the asphalt without substantially altering or modifying the (viscoelastic) properties of the blend.

In one aspect, the disclosure relates to multilayer composite films comprising a first biopolymer such as agarose, and a second biopolymer such as shellac. In the films, one or both layers may further comprise a biodegradable plasticizer. In a further aspect, the films can be flat or can be thermoformed to have a three-dimensional shape. The films are biodegradable and have very low permeability to water, gases, and other contaminants. Also disclosed are methods of making the films and consumer product packaging materials comprising the films.

The article is made from a biodegradable biopolymer.

Orally administrable nanoparticle complexes of biological molecules and biopolymers are described herein, and include formulations for the oral administration of peptides, proteins, nucleic acids, and antibodies.

An enzyme obtained from the saliva of waxworms (Galleria mellonella larvae) is disclosed that has the unexpected ability to oxidize and depolymerize untreated polyolefin-derived polymers, such as polyethylene (PE), at room temperature (RT), neutral pH, and short incubation times. The present invention also relates to a method for biodegrading polyolefin-derived polymers using this enzyme.

The present invention describes capsule compositions consisting of crosslinked chitosan, beta-glucan or alginate, and encapsulates an environmentally compatible ingestible larvicide, especially larvicidal agents such as essential oils or other ingestible larvicides such as Bacillus thuringiensis which are lethal to the larvae of pest insects, especially mosquito larvae.