20 results about "Dehydrocholesterols" patented technology

The invention discloses a process and a device for continuously synthesizing vitamin D3 through photocatalysis, and relates to the technical field of process on-line monitoring and intelligent control. Photochemical reaction requirements under raw materials with different concentrations are matched through multi-band illumination weight dynamic distribution; when the concentration of the 7-dehydrocholesterol fluctuates, the illumination ratio of 290nm to 305nm wavebands is adjusted in real time by a reinforcement learning algorithm, so that the conversion of a pre-vitamin D3 intermediate is more efficient, and the competitive consumption of a by-product path is reduced; the reaction retention time is further optimized through synchronous flow rate adjustment, and local excessive irradiation caused by sudden concentration increase is avoided; the environment temperature and humidity change is incorporated into a state vector, and the control module generates a compensation instruction accordingly; and if the humidity changes suddenly, pulse type flow compensation is triggered to counteract reaction efficiency attenuation. A closed-loop response mechanism reduces the dependence on physical temperature control equipment, and is especially suitable for mobile production scenes.

The invention relates to the technical field of biological medicine, in particular to 7-dehydrocholesterol liposome and application thereof. According to the invention, a biological membrane modified liposome is constructed, and the biological membrane modified liposome comprises an ROS responsive liposome, a neutrophile granulocyte membrane and a renal tubular epithelial cell membrane; the biofilm modified liposome has an active oxygen species (ROS) responsive release function and a dual targeting capability, has the advantages of an integrated drug effect carrier, ROS triggered release, dual bionic targeting, strong target cell uptake and multi-mechanism ferroptosis resistance, and can be used for preparing the biofilm modified liposome. The compound can be used for treating ferroptosis related diseases such as acute kidney injury, myocardial ischemia-reperfusion injury and cerebral ischemia-reperfusion injury, and has wide clinical popularization value.

The present disclosure provides a method for preventing or treating pulmonary arterial hypertension in a subject in need thereof, the method comprising administering to the subject an effective amount of 7-dehydrocholesterol, a salt, oxide, metabolite, or derivative thereof.

The invention relates to the technical field of biochemical engineering, in particular to a method for efficiently converting 7-dehydrocholesterol into vitamin D3. The method comprises two steps of photoreaction and thermal isomerization. Wherein in the photoreaction stage, the reaction selectivity and the yield are remarkably improved by adopting 285 nm ultraviolet irradiation and controlling the energy density within the range of 5-8 W / mL, and the photoreaction yield can reach 60%-70%; a high-temperature condition of 70 + / -2 DEG C is adopted in the thermal isomerization stage, the reaction is carried out in a short time, the reaction period is greatly shortened, the yield is improved, and the thermal isomerization yield can reach 80%-90%; the total yield is superior to that of the traditional process. The method has the advantages of high reaction selectivity, few impurities, high yield, short period and the like, is suitable for industrial production of vitamin D3, and has a wide application prospect.

The application discloses a method for preparing vitamin D3 by visible light catalysis and belongs to the field of biological medicine product manufacturing. The method uses 7-dehydrocholesterol (7-DHC) as raw material, selects tetrabromofluorescein as a catalyst under visible light with a wavelength of 400-780 nm, and 7-DHC is selectively opened to form previtamin D3 (P3) and then isomerized to vitamin D3 by heat. The method can obtain a high-yield (84%) vitamin D3 product by irradiation for only 90 seconds. The method for preparing vitamin D3 by visible light catalysis overcomes the technical bottleneck of the previous ultraviolet light catalysis, avoids the damage to the human body and the environment caused by ultraviolet light irradiation, is more green and environmentally friendly, has high selectivity, short reaction time and high efficiency, and has a wide industrialization prospect.

The present application relates to the technical field of biological chemical industry, and particularly relates to a method for efficiently obtaining 7-dehydrocholesterol from yeast fermentation liquor. The method of the present application is to treat the yeast fermentation liquor with ionic liquid microemulsion, in which the ionic liquid dissolves polysaccharide on the surface of cell wall, and is used for assisting ultrasonic cell wall breaking, so as to shorten the ultrasonic cell wall breaking time, reduce the cell wall breaking power, and improve the cell wall breaking capacity. In addition, the ionic liquid microemulsion contains oil phase, which is a new process integrating the two-step traditional process of cell wall breaking and solvent extraction into one step, so as to shorten the overall process time, reduce the use of process equipment, simplify the process operation process, and can be completely applied to the environment-friendly industrial production, with low cost and wide application prospect.

The invention belongs to the technical field of prostate cancer diagnosis, and particularly relates to serum 7-dehydrocholesterol as a prostate cancer metastasis and endocrine treatment drug resistance diagnosis marker and application thereof. 7-dehydrocholesterol provided by the invention has different levels in human prostate cancer cell lines such as LNCaP, Du145, PC3 and the like, and is abnormally increased in PC3, so that the 7-dehydrocholesterol can be used as a drug resistance diagnosis marker for prostate cancer metastasis and endocrine therapy; the reagent composition capable of specifically recognizing 7-dehydrocholesterol and generating detectable signals can be used for preparing a prostate cancer detection kit; the 7-dehydrocholesterol provided by the invention has non-invasive, non-invasive and efficient effects as a diagnostic marker, and solves the technical problem of lack of a prostate cancer diagnostic marker in the prior art.

The application discloses a sterol C24-reductase mutant for reducing by-products and a Saccharomyces cerevisiae for producing 7-dehydrocholesterol, and belongs to the technical field of biology. In order to solve the problems of by-product production and low catalytic activity caused by the wide substrate spectrum of the key enzyme DHCR24 in the current 7-DHC synthesis process, the leucine at the 162th position and the aspartic acid at the 386th position of DHCR24 are mutated through enzyme engineering modification, and a sterol C24-reductase mutant DHCR24M is obtained. The mutant is introduced into a Saccharomyces cerevisiae starting strain, and it is found through fermentation verification that, compared with the unmutated strain, the by-products cholest-7-en-3-ol and cholesta-5,7-dien-3-ol of the mutant strain are reduced by 31.5% and 46.1% respectively, and the target product is increased by 90.2%, which provides a new idea and method for industrial production of 7-dehydrocholesterol and active vitamin D3, and has a very wide application prospect.

The present invention relates to the field of pharmaceutical chemistry, and specifically to a method for preparing cholesterol, a derivative thereof, and an analog thereof. The derivative of cholesterol comprises, but is not limited to, 7-dehydrocholesterol, 25-hydroxycholesterol, 25-hydroxy-7-dehydrocholesterol, and ergosterol. In the present invention, a compound represented by formula I can be prepared by means of a microbial transformation using phytosterols as a raw material, followed by preparing cholesterol, the derivative thereof, and the analog thereof.

The invention relates to the technical field of organic synthetic chemistry, in particular to a method for synthesizing plant-derived 7-dehydrocholesterol from dinorhydrin. Comprising the following steps: 1, carrying out sulfonic acid esterification reaction on dinorhydrin to obtain an intermediate 1 or a solution containing the intermediate 1; 2, carrying out first enol esterification or enol etherification on the intermediate 1 to obtain an intermediate 2; 3, carrying out coupling hydrocarbylation on the intermediate 2 to obtain an intermediate 3; 4, carrying out upper debromination and deenolization on the intermediate 3 at the same time to obtain an intermediate 4; 5, carrying out second carbonyl enol esterification on the intermediate 4 to obtain an intermediate 5; and 6, carrying out hydrolysis reduction on the intermediate 5 to obtain the 7-dehydrocholesterol. The botanical 7-dehydrocholesterol is synthesized by taking dinorhydrin as a starting raw material, the total weight yield is 36%, the purity is 98% or above, and industrial synthesis is easy to realize.

The invention discloses a yeast engineering strain for synthesizing 7-dehydrocholesterol as well as a construction method and application of the yeast engineering strain, and belongs to the technical field of metabolic engineering. The invention provides a recombinant Candida tropicalis, which integrates a human-derived C 24-dehydrocholesterol reductase gene HsDHCR24, and can be used for preparing the recombinant Candida tropicalis by overexpressing all genes in a front squalene synthesis route and genes in a rear squalene synthesis route. Meanwhile, by blocking a branch metabolic pathway of ergosterol synthesis and weakening the consumption of ergosterol and by virtue of an endoplasmic reticulum engineering strategy, the yield of 7-DHC obtained by shake-flask fermentation of the recombinant strain is increased from 10.1 mg / L to 432.3 mg / L, and by virtue of culture medium optimization and fed-batch fermentation of a 5L fermentation tank, the final yield reaches 3.65 g / L, so that the yield of 7-DHC is greatly improved. While the yield is increased, a thought is provided for synthesizing other sterol products from chassis cells by the candida tropicalis.

The invention relates to the technical field of organic synthetic chemistry, in particular to a method for synthesizing 7-dehydrocholesterol from cholesterol. Comprising the following steps: dissolving cholesterol in a first solvent, adding cyclohexanone and aluminum isopropoxide, and carrying out an Oppenauer oxidation reaction to obtain an intermediate 1; dissolving the intermediate 1 in a second solvent, sequentially adding isopropenyl acetate and p-toluenesulfonic acid, and carrying out first acetylation reaction to obtain an intermediate 2; dissolving the intermediate 2 in a third solvent, and carrying out an upper debromination reaction to obtain an intermediate 3; and dissolving the intermediate 3 in a fourth solvent, then adding 2, 4, 6-trimethylpyridine and acetyl chloride as reaction accelerators, carrying out a second acetylation reaction to obtain an intermediate 4, and carrying out a reduction reaction and purification on the intermediate 4 to obtain the 7-dehydrocholesterol. The 7-dehydrocholesterol is synthesized by the method, the total synthesis yield exceeds 60%, the product purity is 98% or above, and the method is easy to amplify for industrial synthesis.

The invention relates to application of DHCR24 related to diagnosis, treatment and prognosis of cervical cancer. The application comprises the application of the DHCR24 gene expression inhibitor in preparation of drugs for preventing, relieving and / or treating cervical cancer, the application of a reagent for detecting the DHCR24 gene expression level in preparation of products for diagnosis or prognosis of cervical cancer, a cervical cancer risk assessment or prognosis device and a cervical cancer risk assessment or prognosis instrument. The invention finds that 24-dehydrocholesterol reductase (DHCR24) is highly expressed in cervical cancer cells and is related to poor prognosis of cervical cancer; proliferation, migration and invasion of cervical cancer cells and dryness of tumor cells can be inhibited by inhibiting expression of DHCR24, and apoptosis of the cervical cancer cells is promoted. Therefore, DHCR24 can be used as a diagnosis and prognosis marker and a treatment target of cervical cancer, and has a huge application prospect.

This invention belongs to the field of bioengineering, specifically relating to a cholesterol 7-dehydrogenase and a method for synthesizing 7-dehydrocholesterol using the same. This invention provides a cholesterol dehydrogenase and a method for synthesizing 7-dehydrocholesterol using said cholesterol dehydrogenase. By utilizing a highly efficient cholesterol 7-dehydrogenase evolved through enzyme engineering and optimized reaction conditions, this invention reduces dependence on expensive chemical reagents, lowers energy consumption, shortens the production cycle, and improves overall production efficiency.

The present application relates to the technical field of biological chemical industry detection, and particularly relates to a method for determining the content of 7-dehydrocholesterol in yeast, which realizes efficient extraction and accurate determination of 7-DHC in yeast cells through the steps of yeast cell wall breaking treatment, ultrasonic-assisted extraction, high performance liquid chromatography-ultraviolet detection (HPLC-UV) quantitative analysis. The recovery rate of the method can reach 98.8%-99.4%, and the relative standard deviation (RSD) is less than or equal to 2.1%. The method has the advantages of simple operation, high sensitivity and good repeatability, and can be widely applied to the screening of 7-DHC yeast engineering bacteria, the monitoring of the fermentation process and the quality control of industrialized products.

The invention provides yarrowia lipolytica for producing 7-dehydrocholesterol as well as a construction method and application of the yarrowia lipolytica, and relates to the technical field of microorganisms. In order to solve the problem that the yield of 7-dehydrocholesterol produced by using yarrowia lipolytica in the prior art is low, a genome of the yarrowia lipolytica is modified, 24-dehydrocholesterol reductase from chicken is expressed, a mevalonic acid pathway and a sterol pathway are strengthened, and the yield of 7-dehydrocholesterol is increased. The Yarrowia lipolytica strain has the advantages that the Yarrowia lipolytica strain is transformed, the possible influence on the growth of the strain is solved while a by-product way is knocked out, the shake flask yield of the transformed Yarrowia lipolytica is 340.7 mg / L, the amplified production yield of a 5L fermentation tank reaches 1.4 g / L, the yield is greatly increased, a new thought is provided for transforming Yarrowia lipolytica by metabolic engineering, the construction method is simple, the metabolic pathway is clear, and the Yarrowia lipolytica strain is suitable for industrial production. The method has a good application prospect and is beneficial to promoting industrial production of 7-dehydrocholesterol.

The invention relates to the technical field of biological medicine, in particular to a method for efficiently extracting 7-dehydrocholesterol from fermentation liquor. The method comprises the following steps: taking 7-DHC fermentation liquor, carrying out wall breaking on the 7-DHC fermentation liquor by using helicase, then carrying out full-solution extraction by using methyl ether, carrying out separation after extraction, taking an organic phase, carrying out decoloration, filtration, purification and concentration to obtain a concentrate, mixing the concentrate with isopropanol, dissolving, and carrying out low-temperature crystallization to obtain the high-purity white needle-like 7-DHC crystal. The yield of the 7-DHC crystal is not less than 90%, and the purity is not less than 95%. The method disclosed by the invention is simple in process and mild in helicase wall breaking condition, and high-pressure homogenate or ultrasonic equipment is avoided; the methyl ether solvent is easy to recover, the resin is renewable, green and environment-friendly, meanwhile, amplification is easy, and in addition, the obtained 7-DHC is high in yield, high in purity and convenient for industrial application.

The invention relates to the technical field of bio-enzyme catalytic reaction synthesis, in particular to a method for preparing 25-hydroxyvitamin D3, which comprises the following steps: firstly, embedding 7-dehydrocholesterol with hydroxypropyl-beta-cyclodextrin, and then putting the embedded 7-dehydrocholesterol into 25-hydroxylase liquid clarified by a ceramic membrane and an ultrafiltration membrane to carry out water-phase hydroxylation reaction; in the process, an oxygen source is provided by feeding hydrogen peroxide. And after the reaction is finished, extracting with carboxylic ester, washing with water, dehydrating and decolorizing, and crystallizing with a solvent to obtain the high-purity 25-hydroxy-7-dehydrocholesterol. The intermediate is subjected to photolysis ring opening, fractional crystallization for recovery of unreacted substrates, thermal isomerization and final column chromatography, and the 25-hydroxyvitamin D3 with the purity not lower than 94% is obtained. The process provided by the invention simplifies catalysis and purification steps, overcomes the defects of complex reaction system and tedious separation in the prior art, and has the advantages of high conversion efficiency, high yield and easiness in industrial amplification.

The invention discloses a high-concentration 7-dehydrocholesterol enzymatic hydroxylation method based on an organic-water two-phase system, which comprises the following steps: loading high-concentration 7-DHC (7-dehydrocholesterol) through an organic phase, maintaining peroxygenase activity through a water phase, and catalyzing 25-site hydroxylation of 7-DHC by taking hydrogen peroxide as an oxygen source to generate 25-hydroxy-7-dehydrocholesterol. According to the method, the problem of low solubility caused by hydrophobicity of 7-DHC is solved, the substrate concentration is greatly improved, the conversion rate and the product selectivity are improved, the method is suitable for industrial production of calcifediol, the productivity can be improved, and the cost can be reduced.

The invention belongs to the technical field of biological catalysis, and particularly discloses a method for synthesizing calcifediol by using a photocatalytic device. According to the method, 7-dehydrocholesterol is used as a substrate, and 25-hydroxy-7-dehydrocholesterol is obtained through the steps of non-specific oxide enzyme catalysis, extraction, reduced pressure distillation and the like. Dissolving the 25-hydroxy-7-dehydrocholesterol in a polar solvent, a non-polar solvent or a mixed solvent system of the polar solvent and the non-polar solvent, adding an anti-oxidation reagent, and carrying out an illumination isomerization reaction; and under the protection of inert gas, carrying out thermal isomerization reaction on the reaction liquid after photochemical treatment, then carrying out low-temperature crystallization to obtain part of calcifediol crystals, collecting the filtrate after crystallization, and carrying out thermal isomerization reaction and low-temperature crystallization for multiple times to obtain the residual calcifediol crystals. The method has the advantages of simple operation steps, small usage amount of the organic solvent, high synthesis efficiency and cost saving, and is beneficial to large-scale industrial production of calcifediol.