48 results about "Ascomycin" patented technology

A formulation to treat ocular conditions such as dry eye disease, as well as other conditions, is disclosed. Rapamycin and/or ascomycin is administered intraocularly, such as by topical application, injection into the eye, or implantation in or on the eye. For example, a topical administration may contain between about 50 pg/ml drug to about 50 μg/ml drug in a formulation which may be applied at bedtime or throughout the day. For injection, a dose of about 50 pg/mi to about 200 μg/ml may be used. Rapamycin and/or ascomycin may also be administered in milligram quantities as a surgical implant, for example, in a diffusible walled reservoir sutured to the wall of the sclera, or may be contained within an inert carrier such as microspheres or liposomes to provide a slow-release drug delivery system.

Ocular solutions containing at least one macrolide antibiotic and/or mycophenolic acid provide anti-inflammatory, anti-cell proliferation, anti-cell migration, anti-angiogenesis, antimicrobial, and antifungal effects. In one embodiment, the solution is administered intraocularly after cataract surgery before insertion of a replacement intraocular lens, resulting in reduced posterior capsular opacification which may eliminate the need for a subsequent surgery. The solution may be one that is invasively administered, for example, an irrigation or volume replacement solution containing at least one macrolide antibiotic such as tacrolimus, sirolimus, everolimus, cyclosporine, and ascomycin, or mycophenolic acid. The solution may be one that is non-invasively or topically administered in the form of drops, ointments, gels, creams, etc. and may include eye lubricants and contact lens solutions.

Ocular solutions containing at least one macrolide antibiotic and/or mycophenolic acid provide anti-inflammatory, anti-cell proliferation, anti-cell migration, anti-angiogenesis, antimicrobial, and antifungal effects. In one embodiment, the solution is administered intraocularly after cataract surgery before insertion of a replacement intraocular lens, resulting in reduced posterior capsular opacification which may eliminate the need for a subsequent surgery. The solution may be one that is invasively administered, for example, an irrigation or volume replacement solution containing at least one macrolide antibiotic such as tacrolimus, sirolimus, everolimus, cyclosporine, and ascomycin, or mycophenolic acid. The solution may be one that is non-invasively or topically administered in the form of drops, ointments, gels, creams, etc. and may include eye lubricants and contact lens solutions. The solution may contain a supratherapeutic concentration of agent(s) so that a therapeutic concentration of a topically administered solution accumulates in a diseased ocular structure sufficient to treat the disease. The agent(s) may be formulated with polymers or other components for extended or slow release to provide a substantially constant concentration over the course of treatment.

The invention belongs to the technical field of medicinal biotechnology field, specifically relates to a refining method of macrolide powerful immunosuppressant tacrolimus and in particular to a method for refining tacrolimus through reversed-phase high performance liquid preparative chromatography. The method uses crude tacrolimus as raw material to dissolve in organic solvent and adopts C18 reversed-phase preparative liquid chromatography to realize the separation and purification of tacrolimus, ascomycin and dihydro-tacrolimus. The refining method of the invention adopts the proper elution system and has good stability, the impurities can be completely separated under the condition of preparative chromatography, the primary loading quantity can be 200mg, the purity of the obtained tacrolimus can be over 98.5% through HPLC detection; and the whole refining process has simple operation and good universality, is easy to popularize and is suitable for industrial production.

The invention discloses a method of preparing ascomycin through fermentation with streptomyces hygroscopicus. On the basis of the difference on metabolism between on a fermentation pot and a fermentation bottle of the ascomycin in the prior art, a material supplying process for the fermentation bottle is disclosed, namely, various acids or carbon sources are supplied during the middle stage of fermentation to control the pH of a fermentation liquid, to form similar metabolism status between the fermentation pot and the fermentation bottle, thereby increasing fermentation unit and reducing production cost. The method is simple in operation, is mild in conditions. The raw materials are wide in sources and low in cost. The method is low in demand on equipment and is suitable for industrial production.

A pharmaceutical composition in the form of a solid dispersion comprising a macrolide, e.g. a rapamycin or an ascomycin, and a carrier medium.

The invention discloses a method for breeding an high-yield ascomycin strain by performing femtosecond laser mutagenesis on streptomyces hygroscopicus ascomycota subspecies and a culture medium preparation method; the method comprises the following steps: at room temperature, mixing mature slant spores of the streptomyces hygroscopicus ascomycota subspecies (ATCC14891) and sterile water to obtain monospore suspension containing 106-107 spores per milliliter; irradiating the spore suspension for 1-10 min by using the titanium sapphire femtosecond laser with centre wavelength of 800 nm, pulse width of 150 fs and frequency of 76 MHz under a irradiation power of 10-30m W; properly diluting the spore suspension, coating on a solid panel to culture, then screening by using a shake flask to obtain a high-yield ascomycin mutation strain. The method provided by the invention has the advantages that the used femtosecond laser mutagenesis method is feasible and safe to operate; the mutation effect is better than that of the traditional physical and chemical mutagenesis method, and the femtosecond laser mutagenesis method has great popularization value in breeding of microorganism pharmaceutical strains; by using the femtosecond laser irradiation to perform the mutagenesis, the high-yield ascomycin mutation strain can be bred. The positive mutation rate of the mutation strain is 5-30%, and fermenting unit is improved by 10-60% in comparison with that of an original strain.

Provided is ascomycin that has a low level of an FK523 impurity, and pimecrolimus that has a low level of a 32-deoxy-32-epichloro-FK523 impurity, methods of preparing them, and the use of such pimecrolimus for preparing a pharmaceutical composition.

The invention provides a method for separating and purifying ascomycin from streptomyces fermentation broth. The method comprises the following steps: filter-pressing the streptomyces fermentation broth with a plate frame to obtain thalli, extracting the thalli with an organic solvent at room temperature for multiple times, combining extracting solutions, concentrating the extracting solution and then transferring to macroporous resin and silica gel columns for chromatography, concentrating and crystallizing the obtained ascomycin with a mixed solvent, transferring the crystallized crude product to a dynamic axial high-pressure chromatographic column for isolation, and then concentrating and crystallizing the obtained ascomycin with the mixed solvent. In the invention, the prepared ascomycin has the purity of 98% or more and the yield of 80 to 90%. The method for separating and purifying ascomycin from the streptomyces fermentation broth, provided by the invention, has the advantages of greatly shortening the extraction time and improving the efficiency, having convenience in operation, simple process, low cost, easiness in industrial production and the like, and providing a feasible isolation process for the production of ascomycin.

The invention relates to a method for one-step refining of tacrolimus, dihydrotacrolimus and ascomycin in crude tacrolimus. The method comprises the following steps: developing the crude tacrolimus inthe head of a stainless steel chromatographic column filled with a special packing material, performing chromatographic elution with an eluent containing a solvent and water according to a ratio of 60:40, having a pH value, adjusted with an acid, of 4.5 and also containing 5% of a developer, and performing distribution collection, pure product concentration, crystallization and recrystallizationto obtain pure tacrolimus, pure dihydrotacrolimus and pure ascomycin. The HPLC purity of the tacrolimus, dihydrotacrolimus and ascomycin which are obtained through the method is more than 98%. The method has the advantages of convenience in operation, simple process and low cost, can be used in pilot production, and is very suitable for industrial production.

The invention discloses a purification method for ascomycin. The method comprises the following steps: gathering ascomycin loading solution by using a macroreticular resin, collecting eluant and concentrating, adding an extraction agent to concentrated solution and extracting, and concentrating an organic phase to be dry powder; and dissolving the dry powder to be clear methyl alcohol or acetonitrile solution, and preparing a pure ascomycin product in high purity by using a liquid chromatograph. The preparation technology has the good removal effect to a key impurity FK523 in the ascomycin, and the prepared product has the high purity.

The present invention relates to a composition for topical administration comprising an ascomycin and a carrier vehicle vehicle comprising means to retain water in the outer skin layer and means to hinder water evaporating from the skin.

The invention provides a method for increasing the yield of ascomycin by using polyhydroxybutyrate as an intracellular carbon library. A polyhydroxybutyrate synthetic gene phaC from ralstonia eutrophaand a polyhydroxybutyrate decomposition gene fkbU from streptomyces hygroscopicus ascus subspecies are integrated in series to a genome of an original strain Streptomyces hygroscopicus var.ascomyceticus ATCC14891 by using a genetic engineering technology, and continuous production of ascomycin is promoted by exerting the effects of polyhydroxybutyrate on storage, degradation and reuse of a carbonsource, so that the fermentation yield of the ascomycin in the genetic engineering strain reaches 626.30 mg/L, which is increased by 211% compared with the original strain ATCC14891. The method provided by the invention provides a new strategy for high yield of the ascomycin, and the method has potential application value in industrial production of FK520.