54results about How to "Improve encapsulation efficiency" patented technology

The invention discloses a polypeptide or protein nanoparticle based on hydrogen-bonded complexation and a preparation method and application thereof. The nanoparticles comprise a polyphenol compound carrier such as tannic acid as a hydrogen bond donor, a polypeptide or a protein drug such as a glucagon-like peptide as a hydrogen bond acceptor 1 analog (exenatide), salmon calcitonin or insulin, etc., and chitosan, polyvinylpyrrolidone or hyaluronic acid, etc. coated on that surface of the particle as stabilizer and/or functional molecule. The nanoparticles of the invention have extremely high encapsulation efficiency and drug loading capacity, and the prepared therapeutic polypeptide or protein drug nanoparticles are suitable for oral delivery or subcutaneous injection application, and havegreat application prospect.

A submicron emulsion of paclitaxel, the preparation method and the use thereof are disclosed. Said paclitaxel submicron emulsion comprises paclitaxel/steroid complex, oil for injection, water for injection, emulsifier, assistant emulsifier and isotonic agent, wherein the mole ratio of paclitaxel to steroid in the complex is 1:0.2˜4; preferably 1:0.25˜2. Said submicron emulsion is useful for the treatment for malignant tumor. The average particle diameter of the submicron emulsion is less than 400 nm and the pH Value is 3.5-6.

The invention discloses a preparation method of a liposome medicine with the outer layer modified by a hydrophilic polymer. The method comprises the following steps of: preparing a liposome, and then inserting a lipid substance modified by a hydrophilic polymer outside two layers of the phospholipid. The method not only can achieve high encapsulation rate, but also can realize the slow release and target action of a long circulating liposome.

The invention discloses photosensitizer targeting nanoparticles for optical therapy as well as a preparation method and applications of the photosensitizer targeting nanoparticles. The general formula of the targeting nanoparticles is HA-PAMAM-COOH-ICG, wherein HA is hyaluronic acid, PAMAM is a dendritic polymer, COOH is carboxyl, and ICG is indocyanine green. The nanoparticles provided by the invention are good in stability, realize the advantage that the local concentration of the medicine is high through the targeting effect after being administrated, are basically free of toxic and side effects, can be used for carrying out fluorescence imaging research on the accumulation condition of the medicine in a tumor, and also can be used as a photosensitizer for exerting the curative effects of PTT/PDT.

The invention discloses curcumin nano-particles and a preparation method thereof. The curcumin nano-particles compounded by BSG protein extract and lecithin are prepared with a base and/or alcohol extracted BSG protein extract as carrier of curcumin. The prepared curcumin nano-particles are spherical and uniform, and have good dispersibility, narrow PDI value and high encapsulating efficiency. Thecurcumin is wrapped in a hydraophobic nuclear of the BSG protein extract, and solubility, heat stability and ultraviolet radiation stability of the wrapped curcumin are remarkably improved; and besides, the wrapped curcumin has higher DPPH free radical scavenging activity than free curcumin.

The invention relates to the field of medicinal preparations, in particular to a target and fluorescence dual-functional slightly-soluble antitumor medicament nano structural lipid carrier. In the slightly-soluble antitumor medicament nano structural lipid carrier, a lipid carrier of which the inside carries medicaments is formed by solid lipid, liquid lipid, surfactants and slightly-soluble antitumor medicaments; and the surface of the lipid carrier is chemically modified and is in covalent connection with a ligand with a tumor target. The slightly-soluble antitumor medicament nano structural lipid carrier can prolong the in-vivo circulation time of the slightly-soluble antitumor medicaments and improve the bioavailability of the slightly-soluble antitumor medicaments and can be used fortopical diagnosis of tumors by fluorescence imaging.

The invention provides a colon-targeted gel microsphere with a controllable core-shell ratio, and preparation and application of the colon-targeted gel microsphere. The gel microsphere comprises a core layer, an inner shell layer and an outer shell layer from inside to outside in sequence, wherein the core layer comprises cereal prolamin and an active matter; the inner shell layer comprises gel polysaccharide; the outer shell layer comprises chitosan, a cross-linking agent and a suspending aid. The inner shell layer and the core layer form core-shell structure fog drops through a coaxial electrostatic spraying technology, in an outer shell layer solution, the inner shell layer gel polysaccharide of the core-shell structure fog drops is cross-linked with the cross-linking agent and is subjected to electrostatic layer-by-layer adsorption with chitosan, and therefore, the colon-targeted gel microsphere is prepared. The particle size of the gel microsphere is 100-600 [mu] m, the core-shell ratio is 0.5-0.9, the encapsulation efficiency of a water-soluble active matter is as high as 60%, the encapsulation efficiency of an alcohol-soluble active matter is as high as 90%, the release amounts in a stomach simulation liquid and a small intestine simulation liquid within 1 h and 3 h can be as low as 10% and 25%, and the gel microsphere can be efficiently delivered and targeted to the colon.

The invention discloses a preparation method and application of a reduction-sensitive drug delivery system with a high drug loading rate, belonging to the technical field of biomedicine and nanomedicine. According to a technical scheme in the invention, 2,2-dihydroxyethyl disulfide is bonded with camptothecin via a carbonate bond to construct a camptothecin dimer with reduction sensitivity; and then the camptothecin dimer is encapsulated into an amphiphilic block copolymer polyethylene glycol-polycaprolactone by using a dialysis method so as to prepare the reduction-sensitive drug delivery system with a high drug loading rate, wherein the camptothecin dimer has a structure formula as described in the specification. The invention also specifically discloses application of the reduction-sensitive drug delivery system with a high drug loading rate to preparation of sustained-release and controlled-release drugs with targeted anti-cancer effect. Compared with a camptothecin delivery system, the drug loading rate of the drug delivery system provided by the invention is increased from 1% to 12.6%, and the drug delivery system has reduction sensitivity, good biocompatibility and capacityof inhibiting proliferation of tumor cells.

The invention discloses a traditional Chinese medicine composition with bacteriostatic, anti-inflammatory, hemostatic and analgesic effects and a preparation method thereof. According to the method, apithecellobium clypearia extract and a lamiophlomis rotata extract are used as raw materials; poly(lactic-co-glycolic acid) PLGA, vitamin E polyethylene glycol succinate TPGS and poloxamer are used as a drug-loaded matrix. The preparation method comprises the following steps: mixing raw medicinal materials with the drug-loaded matrix to form an oil phase and an oil-in-water phase, performing probe ultrasonic emulsification to obtain a nano-suspension, and adding carbomer, collagen tripeptide, oat beta-glucan and propylene glycol as a gel matrix to obtain traditional Chinese medicine composition nanogel. The prepared traditional Chinese medicine composition nanogel has the particle size of 120 nm-260 nm, has good drug loading capacity, obviously improves the solubility and bioavailabilityof hydrophobic drugs, inhibits bacteria, diminishes inflammation, stops bleeding and relieves pain, and is definite in curative effect.

The invention discloses a preparation method of an expanded vermiculite paraffin PAM shape-stabilized phase change energy storage material. The preparation method comprises the following steps: preparing paraffin/PAM emulsion; and adding the expanded vermiculite into the paraffin/PAM emulsion to obtain the expanded vermiculite paraffin PAM shape-stabilized phase change energy storage material. Theexpanded vermiculite has strong hydrophilicity and low density, can be used as an additive to be added into the body of the paraffin/PAM shape-stabilized phase change material, reduces the flow of paraffin in the material, reduces the leakage amount of paraffin, and improves the utilization efficiency of paraffin. By adding the expanded vermiculite, the leakage of system paraffin is effectively reduced, and the paraffin encapsulation efficiency of the paraffin/PAM shape-stabilized phase change material is improved; in addition, the leakage of the paraffin is effectively reduced, and the encapsulation efficiency of the paraffin and the cycling stability of the material are improved.

The invention discloses a preparation method of a hydrated inorganic salt expanded vermiculite paraffin PAM composite phase change energy storage material. The preparation method comprises the following steps: (1) preparing hydrated inorganic salt/expanded vermiculite by a physical impregnation method; (2) preparing a paraffin/PAM emulsion; (3) adding the hydrated inorganic salt/expanded vermiculite into the paraffin/PAM emulsion to prepare the hydrated inorganic salt/expanded vermiculite with addition of the hydrated inorganic salt/expanded vermiculite paraffin/PAM shape-stabilized phase change energy storage material. The invention effectively reduces the leakage of paraffin as well, improves the encapsulation efficiency of paraffin, and further improves the phase change latent heat of the material due to the existence of the hydrated inorganic salt; more importantly, the hydrated inorganic salt is compounded into the body of the paraffin/PAM shape-stabilized phase change material, so that the supercooling degree of the hydrated inorganic salt is effectively reduced. Test results show that the composite phase change material has high latent heat of phase change, good thermal stability and cycling stability, and good application prospect.

The invention discloses a preparation method of a nano-particle rapamycin-loaded drug coating balloon, and belongs to the technical field of drug manufacturing. The surface of the balloon is coated with hollow mesoporous silica nano-particles (MSNs) loaded with Rapamycin (RPM) through polylactic acid-polyglycolic acid (PLGA). The polylactic acid-polyglycolic acid mixes the mesoporous silica nano-particles loaded with rapamycin into the surface of the balloon, the surface of the balloon is coated with the polylactic acid-polyglycolic acid, nano-particles are bridged to prepare the nano-particle rapamycin-loaded drug coating balloon which is excellent in histocompatibility, biodegradable, high in encapsulation efficiency, stable in drug loading capacity control, small in particle size and constant in-vitro drug release, the effective action concentration of the drug can be reached and maintained in local tissue under the condition that blood flow is affected as little as possible, the negative influence of a drug loading matrix on vascular repair can be overcome, and the anti-endometrial hyperplasia and anti-restenosis effects of rapamycin are improved. The inorganic nano-particles can be compounded with an up-conversion rare earth luminescent fluorescent agent, 4f electrons of a rare earth inner shell layer can emit light under laser irradiation, and therefore the nano-particle rapamycin-loaded drug coating balloon is used for simulating in-vitro conveying and expansion of the balloon in plasma and monitoring the concentration of the nano-particles left in the plasma and used for detecting the drug loading stability of the balloon in the early stage.

A composition of goserelin sustained release microspheres is provided. The microspheres comprise goserelin, at least one poly(lactide-co-glycolide) and poloxamer or PEG. The sustained release microspheres have comparatively high bioavailability, which promotes the drug taking its full effect and have entrapment efficiency over 90%.

The invention discloses an siRNA delivery carrier and a preparation method and application thereof. The siRNA delivery carrier comprises a nano vesicle and siRNA loaded in the nano vesicle, and the nano vesicle is prepared from an erythrocyte membrane. The invention further discloses an siRNA delivery carrier based on nucleic acid aptamer targeting, which comprises a nano vesicle, siRNA loaded in the nano vesicle and the cholesterol modified nucleic acid aptamer loaded on the surface of the nano vesicle. The nano vesicle is prepared from an erythrocyte membrane. In the siRNA delivery carrier based on nucleic acid aptamer targeting, which is prepared by the invention, the siRNA is loaded in the nano vesicle, the encapsulation efficiency is higher, and the siRNA delivery carrier is difficult to degrade.

The invention relates to a preparation method of health-care yoghourt rich in vitamin C, and belongs to the technical field of application of vitamin C. The preparation method comprises the following steps of (1) mixing milk powder with water so as to obtain milk liquid; (2) adding cane sugar and vitamin C composite emulsion to the milk liquid, performing dissolving, and performing homogenizing; (3) sterilizing the solution obtained in the step (2), and performing cooling; and (4) adding zymocyte, performing canning, performing sealing, performing constant-temperature fermentation, performing refrigeration, and performing after-ripening so as to obtain the health-care yoghourt rich in vitamin C, wherein the vitamin C composite emulsion is WOW type emulsion prepared by embedding vitamin C through a two-step emulsification method. The preparation method disclosed by the invention is simple and convenient to operate and high in preparation efficiency, the action time of active substances is prolonged, the storage stability and the using stability of the vitamin C are improved, the bioavailability of the vitamin C is increased, and the prepared yoghourt is good in mouth feel, and has the efficacy of enhancing the immunity of organisms and beautifying faces.

The invention discloses a preparation method and application of nanogel with a hunger combined gas therapy anti-tumor function. The nanogel is prepared by the following steps: firstly, performing electrostatic interaction on polyethyleneimine azide grafted with L-arginine and glucose oxidase to form a nano-enzyme compound; and then covering the surface of the nano-enzyme compound with an alkynyl-containing polycarbonate block copolymer, and performing click chemical crosslinking on azide and alkynyl. Compared with the prior art, according to the method disclosed by the invention, specific enzymatic reaction is utilized to consume endogenous glucose and release nitric oxide gas, cancer cells are killed through hunger and gas therapy, besides, the nitric oxide gas can redistribute oxygen in the cancer cells, hypoxia of tumors is relieved, and wide application prospects are realized in the aspects of resisting tumors and inhibiting tumor metastasis.

The invention discloses a thrombin-responsive reticular polymer and an application thereof in closed-loop thrombin inhibitor delivery, and belongs to the technical field of pharmaceutical preparations. The thrombin-responsive reticular polymer is obtained by a polymerization reaction of a polymer monomer, a thrombin degradable peptide and a thrombin targeting ligand. The polymer is used for entrapping a thrombin inhibitor, can adaptively and quickly release the loaded thrombin inhibitor under the action of high-concentration thrombin, can slowly release the thrombin inhibitor under low concentration, and is finally used for closed-loop thrombin inhibitor delivery, so that the antithrombotic activity of the thrombin inhibitor is improved, and adverse reactions are reduced.

The invention provides a rhein-loaded lactoferrin nanoparticle and a preparation method and application thereof, and belongs to the technical field of biomedical materials. Specifically, the inventionprovides a drug-loaded lactoferrin nanoparticle which is a nanoparticle with a three-layer structure, the three-layer structure comprises a pectin layer, a hyaluronic acid layer and a medicine-carrying lactoferrin layer from outside to inside. The medicine is preferably rhein. The drug-loaded dual-targeting drug delivery nanoparticle provided by the invention has good biocompatibility and good stability, can be orally taken, and has good targeting ability. The nanoparticle loaded with rheinic acid has good colon lesion inflammation and colon injury targeting ability. The nanoparticle maintains stability in stomach and small intestine during oral administration, slowly releases drugs, continuously releases drugs after targeting colon lesion sites, and has good treatment effect on colitis,especially ulcerative colitis. The nanoparticle is excellent in treatment effect and has a good application prospect.

The invention relates to a preparation method of epsilon-polylysine-Arabic gum nanoparticles, which comprises the following steps: (1) raw material preparation: taking epsilon-polylysine and Arabic gum powder, dissolving, filtering and diluting to obtain a diluent for later use; (2) ionic crosslinking: taking the diluent of epsilon-polylysine and Arabic gum in the step (1), and placing the diluent on a magnetic stirrer for mixing and stirring at room temperature; (3) thermal induction: taking the epsilon-polylysine-Arabic gum solution subjected to ionic crosslinking in the step (2), and heating in a water bath; (4) performing ultrasonic treatment: taking the epsilon-polylysine-Arabic gum solution subjected to thermal induction in the step (3), and performing ultrasonication to prepare a nanoparticle solution; and (5) drying for a finished product: taking the epsilon-polylysine-Arabic gum nanoparticle solution subjected to ultrasonic treatment in the step (4), and performing spray drying or freeze drying to obtain the finished product of epsilon-polylysine-Arabic gum nanoparticles. According to the invention, the encapsulation efficiency of the nanoparticles is improved, and the utilization rate of epsilon-polylysine is improved.

The invention relates to the technical field of printing cementing, in particular to a cover conveying and feeding mechanism suitable for a full-automatic cementing machine. The cover conveying and feeding mechanism comprises feeder wallboards arranged oppositely, and a driving chain wheel shaft, a driven chain wheel shaft and a support shaft are arranged between the feeder wallboards in parallel;the driving chain wheel shaft and the driven chain wheel shaft are correspondingly sleeved with three rows of chain driving assemblies; cover conveying flat wheels are correspondingly arranged at thepositions, located at the two ends of the three rows of chain driving assembly, of the driven chain wheel shaft in a sleeving mode, and the cover conveying flat wheels and the top edge of the three rows of chain driving assembly are located on the same height plane; and the supporting shaft is sleeved with a cover conveying pressing wheel assembly corresponding to the cover conveying flat wheel.The cover conveying and feeding mechanism of the cementing machine is high in automation degree, and the automatic book cover feeding process can be conveniently and efficiently achieved; and the three rows of chain driving assembly is adopted, the interval between every two adjacent cover feeding conveying chains can be selectively adjusted, automatic feeding of covers with different widths is achieved, and the automatic cover feeding mechanism is particularly suitable for automatic and continuous feeding and cover feeding of book covers with the width smaller than 200 mm.