摘要:
The invention relates to a method of preparation and isolation of betulin diacetate from birch bark from paper mills and its optional processing to betulin, wherein the birch bark is ground, mixed with two- to twenty-fold excess volume of water and is stirred so that all birch bark is dipped, then the fraction of the birch bark which floats on the surface is collected, said collected fraction is dried at the temperature in the range of from 50 to 85° C. and the betulin contained in the dried birch bark is then subjected to an acetylation reaction, after the acetylation the birch bark is dried at the temperature of from 50 to 100° C. and the formed betulin diacetate is then isolated from the birch bark by supercritical extraction of the birch bark with carbon dioxide at the pressure of 28-35 MPa and the temperature of from 50 to 100° C. and subsequently, the supercritical extract is recrystallized for direct use or for further processing. The further processing can be basic hydrolysis of the re-crystallized betulin diacetate to betulin.
摘要:
The invention relates to a method of preparation of a soluble formulation of water-insoluble pentacyclic and tetracyclic terpenoids, wherein the water-insoluble terpenoid having a free carboxylic, hydroxy or amino functional group is derivatized on this functional group with a substituent selected from the group comprising substituents of general formula Xa bound to the hydroxy group of the terpenoid, wherein Xa is —OC—R—COOH, substituents of general formula Xa bound to the amino group of the terpenoid, wherein Xa is —OC—R—COOH, quarternary ammonium substituents of general formula Xb bound to the carboxy group of the terpenoid, wherein Xb is —(CH2)nN+R3Y—, quarternary ammonium substituents of general formula Xc bound to the carboxy group of the terpenoid, wherein Xc je —(CH2)nR+Y—, substituents of general formula Xd bound to the carboxy group of the terpenoid, wherein Xd represents —R—COOH, glycosylic substituents Xe bound by alpha or beta glycosidic bond to the hydroxy group or to the carboxy group of the terpenoid, wherein Xe is selected from the group comprising glucosyl, galactosyl, arabinosyl, rhamnosyl, lactosyl, cellobiosyl, maltosyl and the 2-deoxyanalogues thereof, and subsequently, the prepared derivative is dissolved in the solution containing water, a cyclodextrin and optionally pharmaceutically acceptable auxiliary substances, forming an inclusion derivative with the cyclodextrin. Object of the invention is further a soluble formulation of a pentacyclic or tetracyclic triterpenoid, containing an inclusion complex of the derivatized pentacyclic or tetracyclic terpenoid with a cyclodextrin, and optionally water and pharmaceutically acceptable auxiliary substances and further a pharmaceutical composition containing the soluble formulation.
摘要:
The invention relates to a method of preparation and isolation of betulin diacetate from birch bark from paper mills and its optional processing to betulin, wherein the birch bark is ground, mixed with two- to twenty-fold excess volume of water and is stirred so that all birch bark is dipped, then the fraction of the birch bark which floats on the surface is collected, said collected fraction is dried at the temperature in the range of from 50 to 85° C. and the betulin contained in the dried birch bark is then subjected to an acetylation reaction, after the acetylation the birch bark is dried at the temperature of from 50 to 100° C. and the formed betulin diacetate is then isolated from the birch bark by supercritical extraction of the birch bark with carbon dioxide at the pressure of 28-35 MPa and the temperature of from 50 to 100° C. and subsequently, the supercritical extract is recrystallized for direct use or for further processing. The further processing can be basic hydrolysis of the re-crystallized betulin diacetate to betulin.
摘要:
A pharmaceutical composition containing a taxane derivative, destined for the preparation of an infusion solution for administration to patients, containing a concentrate consisting of a pharmaceutically effective amount of docetaxel, a suitable solvent, which is preferably ethanol, a surfactant, which is polysorbate 80 and a pharmaceutically effective amount of an appropriate buffer; and optionally a co-solvent, consisting of an aqueous solution of a pharmaceutically effective amount of polysorbate 80 and optionally suitable organic solvent and/or a pharmaceutically effective amount of an appropriate buffer. This composition shows an excellent chemical and physical stability. The invention includes also a method of preparation of the pharmaceutical composition and the use thereof.
摘要:
A gas hydrate is produced by injecting guest molecules into voids in a layer of which temperature and pressure condition allows the guest molecules to cause to form hydrate, in a form of emulsion where liquid of the guest molecules is dispersed in water as minute particles having a size of less than a size of voids, and thereby dispersing the guest molecules uniformly into the voids in the layer.
摘要:
The invention concerns a method of production of a fine-crystalline mixture containing a non-steroid anti-inflammatory drug and an auxiliary substance, wherein a coarse-crystalline substance from the group of non-steroid anti-inflammatory drugs is dissolved in a solvent at an increased temperature, the solution is subsequently distributed at rapid chilling into a cooling liquid containing the auxiliary substance, said cooling liquid being placed in an ice bath, and the product is then filtered off and dried. It further concerns the fine-crystalline mixture of the non-steroid anti-inflammatory drug and the auxiliary substance that can be obtained by the said method. The invention further concerns a solid pharmaceutical composition, having substantially improved dissolution properties, which contains 60 to 78% w/w of the fine-crystalline mixture, 17 to 40% w/w of microcrystalline cellulose, colloidal silicon dioxide in an amount of up to 0.3% w/w, a disintegrant in an amount of up to 4% w/w and optionally a surface active compound in an amount of up to 0.1% w/w. This solid pharmaceutical composition can be filled into capsules or used for the preparation of tablets.
摘要:
The invention relates to a method of preparation of a soluble formulation of water-insoluble pentacyclic and tetracyclic terpenoids, wherein the water-insoluble terpenoid having a free carboxylic, hydroxy or amino functional group is derivatized on this functional group with a substituent selected from the group comprising substituents of general formula Xa bound to the hydroxy group of the terpenoid, wherein Xa is —OC—R—COOH, substituents of general formula Xa bound to the amino group of the terpenoid, wherein Xa is —OC—R—COOH, quarternary ammonium substituents of general formula Xb bound to the carboxy group of the terpenoid, wherein Xb is —(CH2)nN+R3Y—, quarternary ammonium substituents of general formula Xc bound to the carboxy group of the terpenoid, wherein Xc je —(CH2)nR+Y—, substituents of general formula Xd bound to the carboxy group of the terpenoid, wherein Xd represents —R—COOH, glycosylic substituents Xe bound by alpha or beta glycosidic bond to the hydroxy group or to the carboxy group of the terpenoid, wherein Xe is selected from the group comprising glucosyl, galactosyl, arabinosyl, rhamnosyl, lactosyl, cellobiosyl, maltosyl and the 2-deoxyanalogues thereof, and subsequently, the prepared derivative is dissolved in the solution containing water, a cyclodextrin and optionally pharmaceutically acceptable auxiliary substances, forming an inclusion derivative with the cyclodextrin. Object of the invention is further a soluble formulation of a pentacyclic or tetracyclic triterpenoid, containing an inclusion complex of the derivatized pentacyclic or tetracyclic terpenoid with a cyclodextrin, and optionally water and pharmaceutically acceptable auxiliary substances and further a pharmaceutical composition containing the soluble formulation.
摘要:
The invention concerns stable, palatable syrups for oral administration, containing S(+)-ibuprofen, hydroxypropyl beta-cyclodextrin, at least one sweetener and water, optionally essential oils. It also includes methods of preparation of the syrups of the invention, wherein crystalline S(+)-ibuprofen is dissolved in a hydroxypropyl beta-cyclodextrin aqueous solution and the final concentration of S(+)-ibuprofen is adjusted as desired by addition of an aqueous solution of sweeteners or a mixture of sweeteners and optionally of water. If the syrup of the invention contains essential oils, it is prepared by dissolving of crystalline S(+)-ibuprofen in a hydroxypropyl beta-cyclodextrin aqueous solution, combining the resulting solution with an essential oil solution in sweetener/mixture of sweeteners, preferably in a mixture of glycerin and 70% sorbitol aqueous solution, and adjusting the final concentration as desired by addition of aqueous solution of sweeteners or mixture of sweeteners and optionally of water.