95results about How to "Simplify purification operations" patented technology

A device for preparing high-purity organic substance by fusion crystallizing method is a tower structure which is divided into upper cooling-crystallizing segment, middle separating-purifying segment and lower crystal fusing segment. Its tower body is inclined and is composed of casing consisting of intersected two cylinders, heater and parallel engaged two spiral stirrers.

The invention discloses an efficient production method and application of antibacterial peptide plectasin. The efficient production method comprises the following steps of: establishing a pGAPZaA-plectasin eukaryon expression vector, transforming the eukaryon expression vector into host cells, i.e. pichiapastoris to establish expression engineering bacteria, fermenting and culturing the expression engineering bacteria, centrifuging expression culture medium to obtain supernate, and purifying the supernate to obtain the antibacterial peptide plectasin. The antibacterial peptide plectasin can be applied to prepare antibacterial agents or feed additive or preservative, and has good resistance on staphylococcus aureus or streptococcus suis. The invention has the advantages of simple operation and lower cost.

The invention provides a preparation method of propacetamol hydrochloride. The preparation method is characterized in that chloracetyl chloride and paracetamol carry out an acetylization chloride reaction in a polar aprotic solvent to obtain chloroactic acid-4-acetylamino phenyl ester which is directly aminated with diethylamine to obtain N, N'-diethylglycine 4-acetylamino phenyl ester, hydrochloric acid is used for adjusting the pH to be 4, and the propacetamol hydrochloride is obtained. The preparation method has the advantages of mild condition, convenient separation and purification, the total product yield is greatly increased, the use of the amount of the reaction solvent is low, and the preparation method reduces industrial pollution, and is applicable to industrialized production.

The present invention provides a construction and screening method for recombinant human epidermal growth factor (hEGF) engineering bacteria. The construction and screening method comprises the following main steps: 1, adopting a PCR technology to obtain kanamycin resistance gene, and adopting a chemical synthesis method to obtain an escherichia coli cspA gene function element; 2, respectively optimizing gene sequences encoding SUMO protein and hEGF, and then adopting chemical synthesis to obtain a large amount of expressed fusion protein gene sequences OPT-SUMO-hEGF; 3, linking the fragments obtained from the previous two steps into pET21 plasmid to obtain pET-Kan-cspA-SE plasmid; 4, adopting the pET-Kan-cspA-SE plasmid as a template to construct a transposition body; 5, transforming the transposition body into escherichia coli Origami 2 (DE3); and 6, screening a strain having high fusion protein SUMO-hEGF expression. According to the present invention, genome of the obtained strain is stable, a soluble rate of the expressed hEGF is high, and the method is suitable for large-scale industrial production.

The invention discloses a method for synthesis of betamipron in a continuous-flow microreactor. The method comprises the following steps: 1) injecting an aqueous solution containing 0.5-1 M of a mixture of beta-alanine, sodium hydroxide and sodium bicarbonate into a micro mixer through a connecting pipe at a flow rate of 4-48 [mu]l/min, at the same time, injecting benzoyl chloride into the micro mixer through a same-diameter connecting pipe at a flow rate of 0.35-4.14 [mu]l/min, mixing, then allowing the mixed solution to go into the micro-tube reactor for reaction, and thus obtaining a betamipron sodium salt solution, wherein the water bath temperature of the microreactor is -5 DEG C to 5 DEG C, the micro-tube diameter of the micro-tube reactor is 0.3-1.5 mm, and the tube length is 1-3 m; 2) acidizing the betamipron sodium salt solution by concentrated hydrochloric acid until the pH is 2, precipitating out a betamipron solid, filtering, washing, and drying to obtain the betamipron. The betamipron is synthesized in the continuous-flow microreactor; through precise control of mixing of the raw materials and strengthening condensation reaction conditions, the main reaction speed is accelerated, and generation of a benzoyl chloride hydrolysis side reaction is reduced, so that the content of benzoic acid in the crude product is reduced, the purification operation is simplified, and the betamipron yield is improved.

The invention discloses a synthesis method of panobinostat. The synthesis method comprises a step of synthesizing 2-methyl tryptamine or hydrochloride thereof, namely taking 2-methylindole as a raw material, conducting reaction with chloroacetyl chloride or bromoacetyl bromide, and conducting reaction with potassium phthalimide to obtain the 2-methyl tryptamine. According to the technical scheme adopted by the invention, influence of toxic raw materials on the safety of a panobinostat product is avoided; meanwhile, the invention provides the synthesis method applicable to industrial production.

The invention belongs to the field of organic synthesis, and involves a synthesis method of saponin, and in particular a method to construct glycosidic bond in saponin. The method includes the following steps: directly reacting an excessive amount of aldose or ketose with aglycone in an appropriate organic solvent under the action of an acid catalyst and reflux temperature of 30 DEG C to obtain the target product of saponin.

The invention provides a spray tower tray reactor, and a system and a technology for producing propylene glycol monomethyl ether through using the reactor. The spray tower tray reactor comprises a reactor body, and a cavity is arranged in the reactor body; the top of the reactor body is provided with a first material inlet, the sidewall of the reactor body is provided with a second material inlet, and the bottom of the reactor body is provided with a material outlet; and an atomizing nozzle cooperating with the first material inlet, and a first distributor, a second distributor, a multistage tower tray, a liquid collector and a third distributor which cooperate with the second material inlet are sequentially arranged in the cavity from top to bottom. The system comprises the spray tower tray reactor. When the spray tower tray reactor is used to produce the propylene glycol monomethyl ether, the epoxy propane conversion rate is improved, the propylene glycol monomethyl ether selectivity is improved, the alcohol proportion is reduced, and the production efficiency is improved.

The invention discloses a preparation method and an intermediate of Pazopanib. The preparation method comprises the steps of carrying out two-step condensation reaction on 2,4-dichloro-5-nitropyrimidine so as to obtain a compound of a formula 5 (shown in the description), and carrying out reduction on the compound of the formula 5, so as to obtain Pazopanib. The preparation method has the beneficial effects that the yield of Pazopanib is increased, reaction conditions are mild, column chromatography purification is not required, and the preparation method is applicable to industrial production.

The invention provides a synthetic method for a compound 1-{2-floro-4-[5-(4-isobutyl phenyl)-1,2,4-oxadiazole-3-yl]-benzyl}-3-azetidinecarboxylic acid represented by a formula 2. The synthetic method is simple in reaction condition, simple and convenient in post-treatment, easy to operate, high in yield, stable in process and suitable for industrial production.

The invention aims at the chemical industry field, and relates to a preparation method of calcium D,L-2-hydroxy-4-methylthiobutyrate having a high purity and a high bulk density. The method comprises the following steps: fully reacting a hydrocyanic acid mixed gas prepared through an Andrussow method with methylthiopropionaldehyde under the catalysis of an alkali to obtain a 2-hydroxy-4-methylthiobutyronityile system; hydrating the 2-hydroxy-4-methylthiobutyronityile system in the presence of an inorganic acid to obtain D,L-2-hydroxy-4-methylthiobutyramide; and chelating D,L-2-hydroxy-4-methylthiobutyramide with calcium oxide or calcium hydroxide to prepare calcium D,L-2-hydroxy-4-methylthiobutyrate. The method has the advantages of simple synthesis technology and easily available raw materials, the above obtained product has a large bulk density, a high purity and a good fluency, can be effectively mixed with feeds as an animal feed additive to supplement the calcium element and amino acids in the daily ration and improve the endozoic production and immunity performances, and can also be used as a medicinal reagent.

The invention discloses a process for synthesizing a glimepiride raw material medicine. A compound A, namely 3-ethyl-4-methyl-3-pyrroline-2-ketone and a compound B, namely 2-phenethyl isocyanate are taken as start raw materials. The process is characterized in that when an intermediate 1 is synthesized, filtrate is applied mechanically, so that the loss of the intermediate 1 can be reduced, the yield can be increased, and the production efficiency can be improved; when an intermediate 2 is synthesized, hydrochloric ether is adopted as a solvent, so that isomer impurities can be greatly reduced, the content of the isomer impurities can be reduced to 0.5% or less from 8%, and later purification procedures can be simple to operate; when a glimepiride metallic salt is synthesized, acetonitrileis adopted as a solvent, sufficient reactions can be achieved, the reaction time can be greatly shortened, the residue of an intermediate 3 is reduced to 0.2% or less from 5-10%, in addition, a highsolvent recycling rate can be achieved. The process disclosed by the invention is simple and safe, low in production cost, high in yield, stable in intermediate and finished product quality and applicable to industrial large-scale production and hypoglycemic drug, namely glimepiride, synthesis processes with relatively great social, economic and environmental-friendly benefits.

The invention relates to a novel preparation method of esprazole magnesium trihydrate and an intermediate thereof, and belongs to a pharmaceutical technology. The preparation method comprises the following steps: (1) performing condensation reaction to prepare omeprazole sulfide; and (2) performing chiral oxidation reaction to prepare esprazole, performing potassium salt forming reaction to prepare esprazole potassium, and performing ion exchange reaction to obtain the esprazole magnesium trihydrate. The method is high in product yield, high in product purity, mild and safe in reaction condition, low in energy consumption, easy to control and suitable for industrial mass production.

The invention relates to albumin magnetic nanoparticles for magnetic resonance imaging (MRI) and a preparation method thereof. The preparation method includes the steps of dissolving albumin in deoxidized water, leading in nitrogen gas to remove oxygen in a reaction system, adding in dilute ammonia solution dropwise to regulate pH value of the system to be 10-12, adding in anhydrous ferric chloride and ferrous sulfate mixed solution dropwise, stirring on a condition of nitrogen protection, raising heat to 65-75 DEG C for 30-60 minutes, and then cooling to the room temperature and subjecting the mixture to purification after finishing reaction, and finally dialyzing the prepared nanoparticles by dialysis bags with molecular weight of 8kD-14kD for 24 hours to obtain the pure albumin magnetic nanoparticles. In anhydrous ferric chloride and ferrous sulfate mixed solution, the total Fe concentration is up to 1.4-1.8M/L, and molar ratio of Fe to protein is equal to (2.4*104-3.1*104):1. The hydrodynamic size of the nanoparticles ranges from 50 micrometers to 90 micrometers, and thus the nanoparticles are adaptable to biological application such as MRI, drug carriers and immunoassay, and are perfect materials for biomedicine application.

The invention provides a 5, 7-dichlorotetrahydroisoquinoline acetal amine compound as shown in a formula III, and a preparation method and an application thereof. The 5, 7-dichlorotetrahydroisoquinoline compound as shown in the formula III can be used for synthesizing a key intermediate of the rotinostat. The method has the advantages of high atom economy, few byproducts and the like, conforms tothe concept of green chemistry, and is suitable for being developed into an industrial production process.

The invention belongs to the field of gene engineering, and relates to a zipper fastener structure for promoting formation of protein dimers and an application thereof, and the zipper fastener can beused for dimerization of homologous proteins and dimerization of heterologous proteins, and can also be used for polypeptide cyclization, dimerization of polypeptides and extension of polypeptides. Some examples can obtain an ESAT6-CFP10 dimer close to native conformation, wherein the dimer has better solubility and has a better stimulation effect on memory T cells than ESAT6-CFP10 protein expressed by linear fusion. The inventor also finds that the dimer zipper fastener can help to form more stable cyclic polypeptide, and the CCP polypeptide added with the dimer fastener can increase the detection rate of citrullinated antibody in serum of rheumatoid arthritis patients.

The invention mainly aims to provide a compound selectively recognizing mercury ions and a preparation method and application thereof. The preparation method includes following steps: 1), providing a first solution which contains a rhodamine compound dispersed in a first solvent; 2), heating the first solution, and mixing the first solution with a hydrazine hydrate solution for reaction to obtain rhodamine hydrazide; 3), providing a second solution which contains rhodamine hydrazide dispersed in a second solvent; 4), heating the second solution, mixing the second solution with a Lawson reagent, reacting in an inertial gas atmosphere, and separating out sulfur hydrazide; 5), providing a third solution which contains sulfur hydrazide dispersed in a third solvent; 6), heating the third solution, mixing the third solution with terephthalaldehyde, reacting under catalysis of glacial acetic acid and in inertial gas, and filtering to obtain a product. The synthesis process is free of byproduct generation, and the compound is simple in purifying operation and has good selective recognition effect on Hg2+.