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985results about How to "Good physical and chemical stability" patented technology

Solid lipid particles, particles of bioactive agents and methods for the manufacture and use thereof

InactiveUS6207178B1Suppresses decrease in specific surface areaImprove bioavailabilityBiocideCosmetic preparationsLipid formationLipid particle
The present invention is in the area of administration forms and delivery systems for drugs, vaccines and other biologically active agents. More specifically the invention is related to the preparation of suspensions of colloidal solid lipid particles (SLPs) of predominantly anisometrical shape with the lipid matrix being in a stable polymorphic modification and of suspensions of micron and submicron particles of bioactive agents (PBAs); as well as to the use of such suspensions or the lyophilizates thereof as delivery systems primarily for the parenteral administration of preferably poorly water-soluble bioactive substances, particularly drugs, and to their use in cosmetic, food and agricultural products. SLPs and PBAs are prepared by the following emulsification process: (1) A solid lipid or bioactive agent or a mixture of solid lipids or bioactive agents is melted. (2) Stabilizers are added either to the lipid or bioactive agent and to the aqueous phase or to the aqueous phase only depending on their physicochemical characteristics. Stabilizers may also be added or exchanged after homogenization. (3) Drugs or other bioactive substances to be incorporated into the SLPs may be melted together with the lipids if the physicochemical characteristics of the substance permit or may be dissolved, solubilized or dispersed in the lipid melt before homogenization. (4) The aqueous phase is heated to the temperature of the melt before mixing and may contain for example stabilizers, isotonicity agents, buffering substances, cryoprotectants and/or preservatives. (5) The molten lipid compounds and the bioactive agents are emulsified in an aqueous phase preferably by high-pressure homogenization.
Owner:PHARMACIA AB

Composite phase-change energy storage material for microcapsule and preparation method thereof

InactiveCN101824307ANo leaksPlay the role of self-control temperature controlHeat-exchange elementsMicroballoon preparationCrack resistanceSolvent
The invention discloses a composite phase-change energy storage material for microcapsules and a preparation method thereof. The coating of the microcapsule is made of silicon dioxide, and the core of the microcapsule is made of a phase-change energy storage material, wherein the phase-change energy storage material is a paraffin organic solid-liquid phase-change energy storage material. 0.2 to 0.5 wt.% of dispersed emulsifier, 52.5 to 62.5 wt.% of solvent water, 18.75 to 31.5 wt.% of phase-change energy storage material and 15.5 to 18.75 wt.% of inorganic silica source are matched and put into a reactor for stirring for 5 to 8 hours; the mixture is uniformly dispersed and emulsified at the temperature 3 to 8 DEG C higher than that for solid-liquid phase change; hydrochloric acid aqueous solution catalyst with the pH value of 0.93 to 4.07 or sodium hydroxide aqueous solution catalyst with the pH value of 8.0 to 12.0 is added into the emulsion; the reacting solution is naturally cooled to room temperature and precipitation solution is obtained; the precipitate is washed with the combination of water and petroleum ether, wherein the mass percent of the petroleum ether is 30 wt.%; then the precipitate is washed with deionized water and is filtered, and the product is naturally aired. The invention improves the technology of phase-change energy storage and conservation, and has the function of automatic temperature regulation, favorable physical and chemical stability, crack resistance, flame retardancy, wear resistance and high thermal conductivity.
Owner:BEIJING UNIV OF CHEM TECH

Preparation method and application of polyphenol-protein/polypeptide-carbohydrate covalent complexes

The invention discloses a preparation method and application of polyphenol-protein / polypeptide-carbohydrate covalent complexes, and belongs to the technical field of food ingredients and food processing. The method comprises the steps that polyphenol, protein / polypeptide are used as raw materials, an alkaline method is used for inducing a reaction, and polyphenol-protein / polypeptide covalent complexes are prepared; then, a carbohydrate and the prepared polyphenol-protein / polypeptide covalent complexes are used as raw materials, and a maillard reaction is utilized for preparing the polyphenol-protein / polypeptide-carbohydrate covalent complexes. According to the preparation method, the natural raw materials are adopted, no any organic reagent is adopted, the polyphenol-protein / polypeptide-carbohydrate covalent complexes with the good performance can be obtained through two steps, the preparation method is simple, efficient and safe, and production is easy. The polyphenol-protein / polypeptide-carbohydrate covalent complexes have the high oxidation resistance and emulsibility, and the beta-carotene emulsion stabilized by means of the polyphenol-protein / polypeptide-carbohydrate covalent complexes has the good physical and chemical stability.
Owner:CHINA AGRI UNIV

Amphiphilic triblock copolymer, preparation method thereof, and polyethersulfone hollow fiber membrane blend-modified by using amphiphilic triblock copolymer

The invention discloses an amphiphilic triblock copolymer with a structural general formula represented as the following. In the formula, when M1 is vinylpyrrolidone and M2 is acrylic acid, M3 is styrene or acrylonitrile or methyl methacrylate; or when M1 is vinylpyrrolidone and M2 is a chemical bond, M3 is styrene or acrylonitrile. m, n, p, q, are all lager than 1. A number-average molecular weight of the copolymer is 30000 to 100000, a glass-transition temperature of the copolymer is 90-180 DEG C, and a decomposition temperature of the copolymer is 180-430 DEG C. The invention also discloses a preparation method of the copolymer, and a polyethersulfone hollow fiber membrane blend-modified by using the amphiphilic triblock copolymer. The amphiphilic triblock copolymer provided by the invention is insoluble in water. When the amphiphilic triblock copolymer is blended with polyethersulfone and is prepared into a polyethersulfone hollow fiber membrane, the amphiphilic triblock copolymeris hard to precipitate. Therefore, the polyethersulfone hollow fiber membrane is provided with permanent hydrophilicity, protein pollution resistance and excellent blood compatibility. The polyethersulfone hollow fiber membrane can be used in the field of blood purification. The preparation method provided by the invention is simple, and is easy to operate. With the method, industrialization is easy to realize.
Owner:SICHUAN UNIV

Macrolide compositions having improved taste and stability

The invention provides an aqueous pharmaceutical composition for administration as an aerosol to the respiratory tract, nose or oropharyngeal region comprising (i) a macrolide having a poor taste and poor chemical stability in aqueous solution; (ii) at least one salt selected from the group consisting of sodium gluconate, sodium aspartate, sodium acetate, sodium lactate, sodium succinate, sodium maleate, magnesium gluconate, magnesium aspartate, magnesium citrate, magnesium acetate, magnesium lactate, magnesium succinate, and magnesium maleate; or mixtures thereof and (iii) a taste-masking agent different from said salt; wherein (a) the concentration of said macrolide in the composition is in the range of about 0.25 wt.-% to about 15 wt.-%; (b) the molar ratio of said macrolide:said salt is in the range from about 1:0.5 to about 1:100; (c) the pH of the composition is in the range of about 3 to 9; and (d) the osmolality of the composition is in the range of about 150 mOsmol/kg to about 1500 mOsmol/kg. The invention further provides a method of generating an aerosol, preferably by means of a nebuliser, which uses such an aqueous pharmaceutical composition. The macrolide may be used alone or in combination with other drugs. The composition is suitable to treat inflammatory disorders and/or infections of the respiratory tract. It has an improved taste and stability.
Owner:PARI PHARMA GMBH
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