424results about How to "Control release speed" patented technology

The invention discloses a soluble coaxial-cone multi-layer microneedle. The microneedle is in a cone shape; an internal structure of the microneedle comprises a cone-shaped or conical-cylinder-shaped center layer, and one or more outer layers wrapping the center layer; the center layer and the outer layers are prepared by active drugs and/or structural materials; and a mass ratio of the active drugs to the structural materials is (10:1)-(1:100). The multi-layer structure of the microneedle can be dissolved layer by layer and step by step during intracutaneous contact and body fluid contact, so that the drug release time of one or more drugs and a procedure of drug release dosage can be controlled, and the microneedle can be used for partial skin treatment or whole body administration.

The invention relates to a temperature sensitive gel formulation for in situ vagina uses which is prepared from effective dosage of medicament for treating female vagina infection and macromolecular findings through dissolving into cushioning solution or pure water, and charging poloxamer.

The invention relates to a sustained-release granular formulation for preventing and treating crop diseases and insect pests and a preparation method thereof. The pesticide sustained-release granular formulation comprises bentonite, an organic modifier, pesticide active ingredients, an inert filler and a binding agent, and is prepared by the preparation method comprising the steps of: (1) with the bentonite as a basic material, modifying the bentonite by the organic modifier to obtain organic bentonite; (2) loading the pesticide active ingredients on the organic bentonite to prepare medicine-carrying organic bentonite; and (3) mixing the medicine-carrying organic bentonite, the inert filler and the binding agent proportionally, and pelleting to obtain the sustained-release granular formulation. The preparation method of the sustained-release granular formulation, provided by the invention, not only overcomes the defect of low pesticide loading rate of the natural bentonite, but also realizes the controlled release of the pesticide by adjusting a chemical structure and the amount of the modifier, so that the sustained-release granular formulation is coincident with an occurrence rule of the plant diseases and insect pests, and the pesticide sustained-release granular formulation is used safely, reasonably, economically and effectively.

The invention relates to a biological glass base porous composite material of a degradable mechanical enhanced type and a preparation method thereof. The material takes a biological glass porous stent which comprises macroporous channels and mediated pore channels as matrix. Adjacent macroporous channels are mutually communicated. The internal and external surfaces of the macroporous channels and mediated pore channels are provided with gel layers which are assembled layer-to-layer by the biomolecules with positive and negative charges alternatively. The biological glass matrix is made from the components with the following weight percentage of 16-38 percent of CaO, 0-10 percent of P2O5, 45-80 percent of SiO2, 0-0.1 percent of SrO and 0-22.5 percent of Na2O. The releasing speed of the biological active ions of the biological glass base porous composite material which is similar to the extracellular matrix and is decorated by the layer-to-layer assembly of the charges of different polarity of the biomolecules can be effectively cut and controlled. The walls of the pore channels are beneficial to the adhesion growth of cells. The mechanical strength, the fracture toughness and the machinability are good. And the application of the regeneration treatment on the bone gear injury home position of a stress concentrated part can be satisfied.

The invention discloses a preparation method of an anticoagulant material with function of inducing and catalyzing release of endogenous NO. The method comprises the steps of: configuring an alkaline Tris-buffer buffer solution, and adding a compound with certain concentration and pyrogallol structure and a compound with disulfide bond or diselenium bond and containing amino or thiol at two ends; and placing the substrate materials in a reaction solution, controlling the reaction temperature, reacting for 1-24 h, removing the substrate, and cleaning and drying to obtain the objective material. The invention has the advantages of simple operation, mild reaction conditions and easy operation. The component unit of the compound with disulfide bond or diselenium bond and containing amino or thiol at two ends has controllable content; the modified coating prepared by the method has excellent adhesion, and catalyzes the blood NO donors to continuously release NO molecules through in situ catalysis, inhibits activation and aggregation of platelets, inhibits proliferation of smooth muscle cells, and protects vascular endothelium.

The invention discloses a long-acting protective liquid self-secreting super-lubricity coating and a preparation method thereof, and belongs to the anti-corrosion, anti-fouling and anti-icing fields and the like. A coating body is an elastic porous film layer and is divided into a bottom layer, an upper layer and a surface layer. The bottom layer is of a large pore structure, the porosity is as high as 60%-95%, the pore diameter ranges from 100 microns to 2000 microns, and the oil storage amount is increased; the upper layer pore diameter ranges from 10 nm to 100 microns, the thickness rangesfrom 50 microns to 1000 microns, oil is prevented from being lost too fast, and the secretion process is controlled; and the surface layer is of a micro-nano-level convex structure, the roughness ranges from 10 nm to 50 microns, and the lyophobic and oil storage effects are achieved. Lubricating oil is stored in the porous structure, when surface oil dries, the oil can be gradually diffused to thesurface layer through upper-layer small holes to form a liquid protective oil film. Corrosion inhibitors, bactericides and the like added into the lubricating oil are released along with the oil, andthe protective function of the coating is enhanced. When environmental water flow impact, external force extrusion, friction and the like lead to losing of the surface oil film, the external force effect will also promote deformation of the elastic porous structure to secrete oil, it keeps that a stable oil layer is formed on the surface, and the service life of the coating is significantly prolonged.

The invention provides a micron nickel phosphide electro-catalytic material used for hydrogen evolution/oxygen evolution double functions and belongs to the technical field of novel materials. A nickel compound is used as a precursor and a high-boiling-point organic matter is used as a solvent; the material has the characteristics of controlling the synthesis of micron nickel phosphide materials on a microcosmic level and the like; preparation conditions are rapid and moderate; a generated compound of Ni2P and Ni5P4 is of micron-grade nickel phosphide particles and the grain diameter is 5-10 microns; the prepared material can be used for electro-catalytic hydrogen evolution and oxygen evolution double functions and has a good electro-catalytic property; and the material has important meanings on industrial production of the micron-scale nickel phosphide material and application and development of the material, and has a relatively wide application range.

A microcapsule suspension of high-effect cypermethrin is proportionally prepared from high-effect cypermethrin, core solvent, protective colloid, wall material (urea and formaldehyde), wettable disperser, viscosity regulator and water through pre-polymerizing of urea and formaldehyde, depositing on the surface of core while polymerizing, solidifying and preparing microcapsule suspension. It has low poison and high and durable effect.

The invention discloses a production method of a readily available and controlled release composite fertilizer containing three nitrogen elements. The production method is as follows: raw materials containing nitric nitrogen, ammonium nitrogen and amido nitrogen are added in materials; in order to prevent that urea reacts with nitro phosphate fertilizer to generate too much urea nitrate and the production can not performed, ammonia gas is introduced in the granulation process according to different proportions to ammonify nitro phosphate fertilizer, reduce the generation of urea nitrate and increase the neutralization degree of monoammonium phosphate; and powdery fundamental fertilizers containing nitrogen, phosphorous and potassium are added to granulate, and then the composite fertilizer can be obtained through drying, cooling, screening and coating. In the production method of the invention, a lot of heat generated in the thermolysis of the nitro phosphate fertilizer and the neutralization heat of the reaction of ammonia gas and monoammonium phosphate are fully utilized to heat materials and increase the granulation temperature; and the viscosity of urea nitrate is utilized, the solubility of ammonium phosphate salt is increased, the quantity of the liquid phase for granulation can be satisfied, higher granulation rate can be realized without using other adhesive, the cost is reduced, the water content of the granulation material is significantly reduced, the drying energy consumption can be reduced and a large amount of energy consumption can be saved.

The invention relates to a preparation method for antimony-doped tin oxide powder. The preparation method comprises the following steps of mixing antimony trichloride, tin tetrachloride pentahydrate and a compounding ingredient, adding into a hydrochloric acid solution, and uniformly stirring a mixed solution to obtain transparent liquid; uniformly mixing a dispersing agent, tin tetrachloride pentahydrate, water and ethanol to obtain a base solution; dropwise adding the transparent liquid and an ammonium hydroxide precipitating agent into the base solution within 30 to 80 minutes in a double titration way, controlling reaction temperature to be 50 to 60 DEG C while stirring, and controlling final reaction pH to be 5 to 6; stopping stirring after titration, and performing curing to obtain precursor suspension; performing filtration, water washing, alcohol washing, azeotropic distillation, drying, grinding and calcination on obtained precursor precipitates. According to the method, tin and antimony are synchronously hydrolyzed and precipitated, and antimony is uniformly doped; the powder prepared by the method has the advantages of small particle size, loose structure, low agglomeration rate, high dispersibility and the like.

The invention relates to an amphipathy block copolymer-Paclitaxel compound and relative preparation, wherein said invention is formed by bonded aliphatic polyester-carbowax-aliphatic polyester block copolymer and Paclitaxel; with hydroxyl carbowax (PEG), solvent and catalyst, it processes the ring-opening polymerization of aliphatic ester to obtain the liphatic polyester-carbowax-aliphatic polyester block copolymer, then converting the hydroxyl grouyp into end carboxyl; with condensating agent, processing genate reaction with Paclitaxel, to obtain the inventive drug. The invention has amphipathy property, to be made into liquid agent or freeze dried. And its block structure can improve the Paclitaxel content, adjusted between 10-40%.

The invention discloses an anthracycline liposome injection, including the injection and a frozen powder injection and a preparation process of the injection. The frozen liposome consists of the anthracycline or an anthracycline hydrochloride, compound neutral phospholipids, surfactant, negative-charge phospholipids, buffers, PH regulators and freezing protection agent. The preparation process includes the following steps: preparation of a hollow liposome, a homogenized liposome, an anthracycline lopsome and an anthracycline lopsome suspension; adding the freezing protection agent; constant volume; sterilization; sub-package; freezing and drying; storage, etc. The liposome injection can be preserved for 12 months under the room temperature with better stability. And the encapsulation rate can be above 95 percent and a granule diameter is between 30 and 300mm. The side effect is low and the technique is simple, thus being convenient for industrial production.

The invention belongs to the technical field of biological materials, and in particular relates to a preparation method for a borate antibacterial glass coating with bioactivity and application thereof. The preparation method comprises the following steps of: preparing sterilization ion-containing borate glass; smashing and screening the glass; uniformly coating the glass powder onto the surface of an implanted device; performing thermal treatment to make the glass powder have viscosity; and forming an antibacterial coating covered on the surface of the implanted device. The preparation method has the characteristics of simple equipment, easy operation and low cost. The coating of the invention has the bioactivity, can be coated on the surface of the implanted device firmly, and can effectively improve the bioactivity and the antibacterial property of conventional implanted materials.

The present invention discloses a drug sustained release composition sparingly soluble or slightly soluble in water, comprising non-solvent based raw material: a releasing conditioning agent. In the composition, the releasing conditioning agent is added into preparation raw materials and can be used for effectively adjusting the releasing speed of the drug sustained release composition sparingly soluble or slightly soluble in the water, so that a phenomenon of obvious releasing delaying period and burst releasing of the drug sustained release composition sparingly soluble or slightly soluble in the water is avoided, the good sustained release performance is obtained, the therapeutic plasma concentration can be kept for several weeks or even more, the stabilization is relatively good, and the releasing behavior of the drug can be maintained after long-time storage. At the same time, the present invention also discloses a preparation method of the drug sustained release composition sparingly soluble or slightly soluble in the water.

The invention provides a preparation method of a buckwheat flavone microcapsule, which comprises the following steps: 1) pretreating: drying buckwheat grain, buckwheat shell, buckwheat husk or buckwheat stem leaf, sieving after crushing for standby to obtain buckwheat powder; 2) extracting; 3) separating and purifying; 4) preparing a capsule emulsion: uniformly mixing a core material, a wall material and an emulsifier to prepare a buckwheat flavone microcapsule emulsion; 5) spray drying to obtain the buckwheat flavone microcapsule. The invention has the advantages that: 1, the activity of an active component flavone substance in buckwheat is protected; 2, the buckwheat flavone is prevented from damage of gastric acid, has certain targeting after microencapsulation, and has good enteric solubility but insolublility in stomach; 3, the bitter taste of buckwheat is covered; 4, the release speed is controlled, the flavone substance can not be stored in vivo, and the concentration of the flavone substance is rapidly increased in vivo after taking and rapidly decreasing due to metabolism degradation effect, the microencapsulation enables a slow release function and releases functional factors in certain time and scope.

The present invention relates to a blood vessel medicine scaffold, including blood vessel scaffold, medicine and carrier, in which the medicine is coated on the surface of said blood vessel scaffold by means of carrier. The described medicine is rolimus medicine or mixture of rolimus medicine and taxol and/or hirudin, and said rolimus medicine is one of sirolimus, tacrolimus and eotarolimus or mixture of more than two kinds of them.