92 results about "Cefuroxime axetil" patented technology

The invention discloses a preparation method of high-purity cefuroxime acid which is an intermediate for synthesizing second-generation cephalosporins cefuroxime sodium and cefuroxime axetil. The preparation method comprises the following steps: based on 7-aminocephalosporanic acid (7-ACA) as a raw material, carrying out an N-acylation reaction on the 7-ACA and furoyl acetylcholine at the 7-position; at a low temperature, hydrolyzing 3-acetyl with a sodium hydroxide solution, crystallizing, filtering and drying so as to obtain the intermediate 3-deformamido cefuroxime acid (DCC); quantitatively adding the DCC in a tetrahydrofuran solvent, dropwise adding chlorosulfonyl isocyanate for a nucleophilic addition reaction so as to generate chlorosulfonyl cefuroxime acid, and adding purified water for hydrolysis so as to prepare a cefuroxime acid reaction liquid; adding sodium bicarbonate for salifying; removing by-reactant lactone and other unsaponifiable impurities in the reaction liquid with a ternary compound extracting agent of dichloromethane, ethyl acetate and tetrahydrofuran, layering, and adding hydrochloric acid in a water phase for acidification; adding the ternary compound extracting agent to extract and separate out the cefuroxime acid; and removing water-soluble impurities, crystallizing and filtering a distilled organic phase, and then drying so as to obtain the high-purity cefuroxime acid with the purity of more than or equal to 99%.

The present invention relates to a method for determining 10 kinds of antibiotics in a water environment through combination of a sample pre-treatment technology and HPLC-MS, and belongs to the field of detection of safety of trace organic contaminant residue in the water environment. The method is characterized in that a water sample is separated and enriched through combination of solid phase extraction and dispersive liquid-liquid microextraction (SPE-DLLME), and then an ultra-high performance liquid chromatography-mass spectrometry instrument (UPLC-MS/MS) is adopted as a detection tool to directly determine the contents of 10 kinds of common antibiotics in the water environment (drinking water, tap water, river water, sewage treatment plant influent and effluent), wherein the 10 kinds of the common antibiotics respectively are sulfadiazine, sulfamethoxazole, oxytetracycline, tetracycline, doxycycline, ciprofloxacin, levofloxacin, chloramphenicol, cefuroxime axetil and tinidazole. According to the present invention, the water sample pre-treatment method and the instrument detection conditions are investigated and optimized, and the optimal SPE-DLLME-UPLC-MS/MS method is established and is successfully applied for the real sample determination; and compared with the traditional method, the method of the present invention has advantages of high sensitivity, high extraction recovery rate, wide application objects, environmental protection, and the like.

The invention relates to a cefuroxime axetil taste masking pellet and the preparation method. The invention contains cefuroxime axetil pill and a taste masking coating layer wrapping the pill. The invention overcomes the shortages of bitter taste with traditional cefuroxime axetil tablet, provides a preparation method of cefuroxime axetil taste masking pellet which masks bitterness, releases drug rapidly and has stable quality.

The invention relates to a cefuroxime axetil odor-masking pellet and a preparation method thereof. The cefuroxime axetil odor-masking pellet consists of an uncoated pellet containing the cefuroxime axetil and an odor-masking layer coating outside the uncoated pellet. The cefuroxime axetil odor-masking pellet overcomes the defect of bitter taste of the prior cefuroxime axetil tablets, and provides a novel cefuroxime axetil preparation which masks bitter taste, releases medicament rapidly and has stable quality.

The invention relates to a direct compression process for cefuroxime axetil dispersible tablets, which is characterized in that: the following raw materials and auxiliary materials are sieved through a 40 mesh sieve and are mixed for thirty minutes in a mixing tank, and then the mixed powder materials are directly compressed by a high speed rotary tablet press to form the cefuroxime axetil dispersible tablets; and based on 125 grams of cefuroxime axetil, the raw materials and the auxiliary materials for producing 1000 dispersible tablets comprise 25 grams of cefuroxime axetil, 4 to 10 grams of stearic acid, 210 to 250 grams of microcrystalline cellulose, 28 to 35 grams of croscarmellose sodium, 2 to 4 grams of silicon dioxide and 2 to 4 grams of sodium dodecyl sulfate. The direct compression process for the cefuroxime axetil dispersible tablets improves the dissolution rate of the cefuroxime axetil dispersible tablets and improves the bioavailability and the healing effect of the medicament, wherein the dissolution rate reaches 99.5 percent at the time when the tablets dissolve for 45 minutes. The direct compression process simplifies the production process, shortens the production period and saves energy.

A fast disintegrating controlled release oral composition comprising a core material containing cefuroxime axetil present as controlled release form, the cefuroxime axetil being provided with an outer coating of a copolymer selected from aqueous dispersions of enteric methacrylic acid and methacrylic acid esters anionic copolymers having carboxyl group as the functional group or mixtures thereof and an inner coating of a sustained-release copolymer selected from aqueous dispersions of acrylate and methacrylate pH independent copolymers having quaternary ammonium group as a functional group or mixtures thereof, and optionally probenecid. Additionally, the coating composition may contain plasticizers. The composition is suitable for once daily administration.

The invention provides a cefuroxime axetil dispersible tablet. The cefuroxime axetil dispersible tablet prepared by the invention can be released within a short time; the formula is reasonable; bitter taste of the cefuroxime axetil dispersible tablet is masked; the mouth feel of the cefuroxime axetil dispersible tablet is improved; the medicinal compliance is improved; furthermore, the preparation process is simple and feasible, strong in operability and steady in process; the bioavailability and the curative effect of the cefuroxime axetil dispersible tablet disclosed by the invention are increased.

The invention provides a dispersible tablet of cefuroxime axetil, wherein the preparation formula includes cefuroxime axetil, loading agents, flow aid, disintegrating agents, surface-active agents, flavoring agents, lubricant, essence, and coating powder. According to the invention, specific disintegrating agents are adopted, meanwhile, the use amount of the disintegrating agents is not increased, the dispersion time of the dispersible tablet is shortened, and the dissolution rate of the dispersible tablet is improved; and meanwhile, flavoring agents and essence are added in the formula to mask bitter of the dispersible tablet of cefuroxime axetil, so that the mouth feel of a patient taking the dispersible tablet of cefuroxime axetil can be improved.

The invention discloses a cefuroxime axetil hot-melt coating composition and a preparation method of the composition. The cefuroxime axetil hot-melt coating composition can effectively cover up the bitter taste of the medicine, so that the delivery compliance of the patient is improved. Meanwhile, the medicine of the cefuroxime axetil hot-melt coating composition has high dissolution rate in aqueous solvents of different pH values, and the bioavailability of the medicine is high. The composition disclosed by the invention can be further used for preparing a dry suspension or granules, thereby facilitating delivery of infants and children unable to swallow. The composition disclosed by the invention is simple in preparation method, free from any solvents, uniform in medicine content, short in heated time, less in energy consumption and easy to realize continuous production on a large scale.

The invention provides a method and a device for making superfine amorphous cefuroxime axetil. The method is as follows: a solution and a desolvation containing cefuroxime axetil are injected into Y-type microreactors or T-type microreactors at the same time respectively through different inlets according to a certain volume ratio; and the solution and the desolvation are quickly and fully mixed inside the microreactors by means of the small size effect of the microreactors. Amorphous cefuroxime axetil can be made through the desolvation precipitation mode which can quickly realize micromixing. The amorphous cefuroxime axetil obtained by the method has small particles, controllable particle diameter, narrow and even particle size distribution, thereby increasing the bioavailability of the amorphous cefuroxime axetil; moreover, the cefuroxime axetil is suitable for industrial production.

The invention discloses a cefuroxime axetil composition and a preparation method thereof. The cefuroxime axetil composition can effectively cover bitter taste of a cefuroxime axetil medicine so as to improve the delivery compliance of the patient. Meanwhile, the medicine containing the cefuroxime axetil composition has higher dissolution rate and high bioavailability. The composition disclosed by the invention can be further used for preparing dry suspensions or granules which are more beneficial for infants, children and patients without the ability of swallowing to take. The composition disclosed by the invention is simple in preparation method, free from any solvents, uniform in medicine content, short in heating time, small in energy consumption and easy to realize continuous large-scale production.

A stable taste masked, pharmaceutical composition comprising a plurality of coated, non-disintegrating discrete dosage units, said units comprising of a core comprising one or more cephalosporins such as cefuroxime axetil and cefpodoxime proxetil and one or more coating layers. Cefuroxime axetil is in α-crystalline and amorphous forms, where at least 30% of the Cefuroxime axetil is in the α-crystalline form, wherein the particle size distribution of the α-crystalline form being such that 100% of the particles have a particle size below 250μ. The ratio of the crystalline fraction to the amorphous fraction ranges from 0.3:0.7 to 0.99:0.01. The particle size of cefpodoxime proxetil is such that 90% of the particles are below 15μ. The process of preparation of coated, non-disintegrating pellets comprising the steps of reducing the particle size of the one or more cephalosporins, blending with the other excipients, wet granulation, extrusion, spheronization, drying and screening to obtain pellets, said pellets being further coated with one or more layers of film coating to achieve taste masking.

The invention discloses a cefuroxime axetil pharmaceutical composition prepared by powder direct compression method, wherein the weight ratio of all components in the preparation is 38.8-63.1% of cefuroxime axetil (in terms of cefuroxime), 10.7 to 35.5% of filler, 1.5 to 15% of disintegrant, 0.3 to 3.5% of wetting agent and 0.3 to 2.0% of glidant, the single composition weight is 400 to 600mg. Theinvention solves the problems of poor raw material flowability and instability of wet granulation, avoids the problem of dissolution caused by multiple compression and comminution on the material inthe dry granulation process, effectively reduces the energy consumption in the production process, and is more benefit to enlarge production.

The invention relates to a crystalline cefuroxime axetil preparation method, which comprises: 1) carrying out a reaction on paraldehyde and acetyl bromide at a temperature of -10-10 DEG C under the action of a catalyst to obtain 1-bromoethyl acetate; 2) adding cefuroxime acid and a catalyst to the mixed solution of an organic solvent and water, adjusting the temperature to -20-5 DEG C, adding the1-bromoethyl acetate prepared in the step 1) to the mixed solution in a dropwise manner to obtain the crystalline cefuroxime axetil. According to the present invention, the method improves the traditional process, simplifies the process, improves the product quality, does not use the extraction solvent dichloromethane, greatly reduce the production cost, and improves the reaction efficiency and the purity of the final product.

The invention belongs to the medicine preparation field, more specifically relates to a Cefuroxime axetil dispersible tablet and its preparation method, the dispersible tablet comprises the following raw materials: Cefuroxime axetil, magnesium stearate, microcrystalline cellulose PH-102, aspartame, cross linked sodium carboxymethyl cellulose, essence, silica and sodium dodecyl sulfate. The method comprises the following steps: passing the above raw materials through a sieve with 40 meshes, mixing the aspartame and microcrystalline cellulose PH-102 with equal weight for 5 minutes, then adding all the cross linked sodium carboxymethyl cellulose for mixing for 5 minutes, placing the mixed powder and residual raw materials in a mixed tank, mixing for 20 minutes, tabletting by a high speed rotary tablet machine to obtain the Cefuroxime axetil dispersible tablet. The dissolution rate of the prepared Cefuroxime axetil dispersible tablet can reach more than 90% after 15 minutes, 99.5% after 45 minutes, thereby the biological availability and curative effect of the medicines can be fully enhanced.