46results about How to "Simple separation and purification" patented technology

The invention discloses a method for catalytic degradation of hexachlorobenzene. The method comprises the following steps: firstly, filling a catalyst into a fixed bed reactor, and carrying out reduction treatment on the catalyst; secondly, mixing hexachlorobenzene steam and preheated hydrogen uniformly to obtain a mixed gas, introducing the mixed gas into the fixed bed reactor after reduction treatment, and carrying out catalytic hydrodechlorination reaction on the catalyst, thereby obtaining the mixed gas of benzene steam, hydrogen chloride gas and unreacted hydrogen; and thirdly, feeding the mixed gas of benzene steam, hydrogen chloride gas and unreacted hydrogen into a condenser for condensing, converting benzene into liquid, then feeding the hydrogen chloride gas and unreacted hydrogen in the mixed gas into an absorption tower for absorbing hydrogen chloride by ammonia water, compressing the unreacted hydrogen by a compressor, and returning for recycling. A solvent is not required to be added in catalytic hydrogenation and degradation of hexachlorobenzene by the method provided by the invention, benzene and ammonium chloride are produced as byproducts, and zero emission of pollutants can be reached, and the method is an environmental-friendly technology for degrading hexachlorobenzene efficiently.

The invention discloses a method for producing deoxidized violacein and special recombination strains thereof. The method comprises the following steps of: obtaining the recombination strains through inducting a deoxidized violacein synthesis associated gene cluster into bacillus coli BL21-CodonPlus(DE3)-RIL, producing the deoxidized violacein through the recombination strains which take tryptophan as a substrate to ferment, wherein the deoxidized violacein synthesis associated gene cluster is a recombination gene cluster which is obtained through getting rid of a VioD gene from a violacein synthetic gene cluster consisting of VioA, VioB, VioC, VioD and VioE, and the recombination strains are obtained through inducting the gene cluster into bacillus coli BL21-CodonPlus(DE3)-RIL and are capable of producing the deoxidized violacein. The method for producing the deoxidized violacein has a yield as high as 0.71g/L fermentation liquor with convenient extraction and simple separation and purification.

This article relates to a process improvement method for the preparation of levetiracetam intermediate 2-aminobutyridine from antiepileptic drugs. The method of the invention improves the traditional Strecker reaction, and remarkably improves the reaction efficiency through the airtight ammonia pressure condition and the use of excess cyanide.

The invention discloses a fusion protein expression purification method, which comprises the following experimental articles: 1ul of recombinant pET32a plasmids, BL21 (DE3) bacterial strains, 100ug/ ml of penbritin, 0.5mM of IPTG (isopropyl-beta-d-thiogalactoside), PBS (Phosphate Buffer solution), 220rpm, 2M urea,50mM of Tris, 300mM of NaCl, 1mM of DTT (dithiothreitol), lysozyme, 0.2% of TritonX-100, 5mL of NI-NTA, EK (Enterokinase) enzyme, nickel agarose affinity chromatography and a SK3071 non-interference albumen concentration measurement kit. The fusion protein expression purification method comprises the following experiment process: the prokaryotic expression of fusion protein, the purification of the fusion protein and the analysis of the purified fusion protein. According to the fusion protein expression purification method, (50mM of imidazole) eluant which contains target protein is dialyzed into 1M urea, the 1M urea is dialyzed at a temperature of 4DEG C overnight, the EK enzyme is added into a sample subjected to dialysis overnight, protein subjected to enzyme digestion is subjected to the nickel agarose affinity chromatography to remove a label and the EK enzyme, and the purity of the purified fusion protein is detected and analyzed through SDS-PAGE (Sodium Dodecyl Sulfate Polyacrylamide Gel Electrophoresis) electrophoresis and gray analysis. Therefore, compared with a non-fusion expression carrier, the purified fusion protein has the advantages of high expression quantity, simple foreign protein separation and purification, high recovery rate, simple purification and purification technology and low cost.

The invention discloses 3,5-(E)-dibenzylidene-N-cyclopropyl piperidine-4-ketone and application of the 3,5-(E)-dibenzylidene-N-cyclopropyl piperidine-4-ketone in preparing antitumor drugs. The 3,5-(E)-dibenzylidene-N-cyclopropyl piperidine-4-ketone compound can be obtained by Claisen-Schimidt reaction of aromatic aldehyde and N-cyclopropyl-4-piperidine ketone. The 3,5-(E)-dibenzylidene-N-cyclopropyl piperidine-4-ketone compound can obviously restrain the proliferation of various tumor cells and can be used for preparing drugs for treating leukocythemia, colorectal cancer, lover cancer, skin cancer, gastric cancer, breast cancer, prostatic cancer or other malignant tumor.

The invention discloses a fusion protein of a HAS and human mutant HGF, and a preparation method and application thereof. The fusion protein comprises a first region composed of the HSA and a second region composed of the human mutant HGF, wherein the human mutant HGF refers to a mutation of amino acid R at site 494 of a HGF into N, D, K, Q or G. According to the invention, the HSA-HGF fusion protein is prepared from a HGF mutant which is biologically active without the action of proteolytic enzymes, and the fusion protein improves the expression level of the HGF in a CHO system and is simplified in separation and purification while maintaining the biological activity of the HGF. The fusion protein of the invention prolongs the in-vivo half-life of the HGF and increases the expression level of the HGF while maintaining the biological activity of the HGF, and has good application prospects in the pharmaceutical field.

The invention provides a preparation method of a wood fiber oil-absorption material. An esterification reaction is carried out on wood fiber and an esterification reagent under the conditions of a pyridine catalysis effect and ball-milling, so that the wood fiber oil-absorption material is obtained, an organic solvent does not need to be used in the reaction process, the product separation and purification treatment is simple, and the preparation technology is convenient in operation, short in modification time, high in reaction degree and better in oil absorption effect; the absorption rate for diesel oil is 9.86 g/g, and the absorption rate for soybean oil is 10.21 g/g.

The invention discloses a continuous synthesizing method of maltose laurate in the organic phase, which is characterized by the following: using stirring tank typed enzyme reactor to synthesize maltose laurate; affirming optimum manufacturing condition; maintaining the reactor production at 10g/(L .d) for 8-10d; obtaining the purity of product to 95%.

The invention discloses a synthesis method of 3,6-halogen atom-substituted 1,8-naphthalimide. The synthesis method comprises the following steps of introducing halogen atoms to 3 and 6 bits of 1,8-naphthalimide; taking 3,6-diamido-1,8-naphthalimide, sodium nitrite and cuprous halide as raw materials, wherein the molar ratio of the 3,6-diamido-1,8-naphthalimide to the sodium nitrite is 1:(1-10), and the molar ratio of the 3,6-diamido-1,8-naphthalimide to the cuprous halide is (1:1) to (1:10); and reacting for 1-48h at a low temperature of -10 DEG C to 10 DEG C under a mixed solvent to obtain the 3,6-halogen atom-substituted 1,8-naphthalimide. The 3,6-halogen atom-substituted 1,8-naphthalimide is greatly prepared through mild conditions. The method has the advantages of being simple and convenient to separate and purify and mild in reaction conditions.

The invention discloses a synthetic method of highly-activity chiral acetylenic alcohol (S,E)-1,9-diene-4,6-diacetyl-3-octadecyl alcohol. The synthetic method disclosed by the invention comprises thefollowing steps: bromooctane is taken as a starting raw material and is reacted in a reasonable proportion to synthesize required alkynol; and the efficient synthesis of active molecule (S,E)-1,9-diene-4,6-diyne-3-octadecanol is realized through reduction, bromination, coupling reactions, desilication and docking with a chiral molecule. According to the method, the yield in the reaction process ishigh, a synthetic route is simple, the raw material is simple and easy to obtain, the synthetic cost is low, reaction conditions are mild, the separation and purification operations are simple, and ahigh-purity target compound can be directly obtained; a chiral center is introduced in the last step, so that the possibility of racemization of the substance in the reaction is avoided; and in addition, the synthesized active molecule (S,E)-1,9-diene-4,6-diyne-3-octadecanol has a wide application prospect.

The invention belongs to the field of bioengineering technology, and discloses pseudomonas aeruginosa bacteriophage lysin, a coding gene thereof, a recombinant expression vector as well as a preparation method and an application thereof. An amino acid sequence of the pseudomonas aeruginosa bacteriophage lysin is shown as SEQ ID No.1, and a nucleotide sequence of the pseudomonas aeruginosa bacteriophage lysin is shown as SEQ ID No.2; the recombinant expression vector is constituted by recombining the nucleotide sequence of the pseudomonas aeruginosa bacteriophage lysin and a vector; and the recombinant expression vector is transformed into a host bacterium, so that a recombinant engineering bacterium is constituted. The pseudomonas aeruginosa bacteriophage lysin provided by the invention has the advantages that the pseudomonas aeruginosa bacteriophage lysin is relatively strong in lysis activity on pseudomonas aeruginosa in vitro. With the application of the preparation method of the pseudomonas aeruginosa bacteriophage lysin provided by the invention, the mass expression and preparation of the pseudomonas aeruginosa bacteriophage lysin can be achieved, and the preparation method issimple in separation and purification and is low in cost.

The invention relates to preparation of a novel resveratrol derivative trans-3,5-dihydroxy-4'- acetylamido-stilbene, and belongs to the fields of organic chemistry and food chemistry. The invention aims to solve the technical problems by providing a preparation process of the resveratrol derivative tans-3,5-dihydroxy-4'- acetylamido-stilbene, wherein the preparation process has mild reaction conditions, high reaction selectivity, little side reaction, simple separation of products and high yield. The preparation process is characterized in that raw materials including 3,5-dimethoxybenzaldehyde, p-acetamido benzyl chloride, triethyl phosphite and boron tribromide are subjected to three step of chemical reactions to obtain the product trans-3,5-dihydroxy-4'- acetylamido-stilbene.

The invention discloses a method for preparing glucosamine hydrochloride through mushroom dregs for producing glutamic acid. The method comprises the following steps that firstly, the wet glutamic acid mushroom dregs are taken, an ethanol solution with the volume being 2-3 times that of the glutamic acid mushroom dregs is added into the glutamic acid mushroom dregs, reflux extracting and filtering are carried out, and filter residues are obtained; secondly, water is added into the filter residues, ultrasonic extracting and filtering are carried out, and filtrate is obtained; thirdly, the filtrate is evaporated to dryness, a dry substance is obtained, water and hydrochloric acid are sequentially added into the dry substance, hydrolyzing is carried out for 3-5 hours under the condition that the temperature ranges from 15 DEG C to 30 DEG C, after hydrolyzing is completed, methyl alcohol is added, standing is carried out, and liquid supernatant is poured out; fourthly, the pH of the liquid supernatant is adjusted to 7-7.2, filtering is carried out, and white precipitate is obtained; methyl alcohol is added into the white precipitate, stirring is carried out for dissolving, methyl alcohol liquid supernatant is obtained, methyl alcohol is added into residual white precipitate, the operation is repeated multiple times, the methyl alcohol liquid supernatant is mixed and concentrated to be dry, and the glucosamine hydrochloride is obtained. The method for efficiently preparing glucosamine hydrochloride through the mushroom dregs for producing the glutamic acid is established for the first time, the number of kinds of needed reagents and the amount of the needed reagents are small, and the preparation cost of the glucosamine hydrochloride is reduced.

The invention discloses a method for accelerating biological production of 5-aminovaleric acid. Through co-expression of a lysine specific permease gene lysP and a 4-aminobutyric acid transporter gene pp2911 in an engineering bacterium that an L-lysine 2-monooxygenase gene davB and a [delta]-amino valeramide hydrolase gene davA are co-expressed, the speed and the yield of producing the 5-aminovaleric acid by catalyzing L-lysine through the engineering bacterium are improved. In comparison with a recombinant bacterium that either the L-lysine 2-monooxygenase gene davB or the [delta]-amino valeramide hydrolase gene davA is expressed, the method, which achieves the co-expression of the lysine specific permease gene lysP and the 4-aminobutyric acid transporter gene pp2911, can improve the yield of the 5-aminovaleric acid by virtue of the genetically engineered bacterium by 67.3%, and the conversion rate of the 5-aminovaleric acid can reach 0.94mol/mol or above. The method disclosed by the invention has a broad application prospect for the industrial production of the 5-aminovaleric acid.

The invention discloses an Orexin-A pegylation modifier which is connected with polyethylene glycol by an N-terminal amino covalent bond of Orexin-A. A preparation method of the Orexin-A pegylation modifier comprises the steps of enabling the Orexin-A and methoxy polyethylene glycol propionaldehyde or methoxy polyethylene glycol succinamide carbonate to undergo a reaction for 0.5-24 hours under the conditions that the pH is 4-9, and the temperature is 4-37 DEG C, wherein the molar ratio of the Orexin-A to the methoxy polyethylene glycol propionaldehyde or the methoxy polyethylene glycol succinamide carbonate is 1: 5-1: 50; then, adding small molecule amino acid to stop the reaction; desalting the product obtained in the first step by a Sephadex G-50 chromatographic column; after that, sampling the protein collected after desalting onto a QAE-Sephadex A-50 anion exchange column; and carrying out elution by a 10mM PB (phosphate buffer) solution, collecting the eluting peak, concentrating and carrying out freeze drying to obtain the Orexin-A pegylation modifier. The Orexin-A pegylation modifier is good in stability, long in half-life period and low in toxic and side effects.

The invention provides a preparation method of momordin Ib. The preparation method comprises the following steps: firstly, mixing and reacting a plant containing a triterpenoid saponin derivative witha structural unit shown in a formula (I) or a plant extract containing the triterpenoid saponin derivative with the structural unit shown in the formula (I) with acid; (2) dissolving the momordin Ibin water to obtain an extracting solution, adjusting the pH value of the extracting solution in the step (1) to 6.5-7.5 by using alkali, and separating by using column chromatography to obtain a sample containing the momordin Ib; and finally, recrystallizing the obtained sample containing the momordin Ib to obtain a pure product of the momordin Ib. According to the invention, a plant or a plant extract rich in a triterpenoid saponin derivative with a structural unit shown as a formula (I) is used as a raw material for preparing momordin Ib; results show that the method not only is simple in separation and purification operation, but also can realize large-scale acquisition of momordin Ib, and solvents for elution and recrystallization in each step can be recycled for multiple times and thus the method is suitable for industrial production.

The invention relates to a preparation method of N-Boc-1, 2-diaminoethane. The preparation method comprises 1) dissolving phenol, a catalyst and a base in a first organic solvent, and adding di-tert-butyl dicarbonate into the solution with the first solvent drop by drop for a reaction to obtain tert-butyl phenyl carbonate, and 2) dissolving 1, 2-diaminoethane in the first organic solvent, and adding tert-butyl phenyl carbonate into the solution drop by drop for a reaction to obtain a final product. The preparation method has simple separation and purification processes, has a small reaction temperature range and a high reaction yield and realizes a low raw material cost.

The invention relates to a method for simply and conveniently preparing monodisperse magnetic nanoparticles on a large scale. The method comprises the following steps: step 1, carrying out a reflux reaction on sodium oleate and ferric chloride hexahydrate in a mixed solvent of absolute ethyl alcohol, deionized water and normal hexane to prepare an iron oleate complex; step 2, taking water as a solvent, and extracting and purifying the ferric oleate complex for multiple times; and step 3, dissolving the purified waxy ferric oleate complex and oleic acid in a 1-octadecene solvent, carrying out high-temperature decomposition, then carrying out precipitation by using ethanol, and carrying out centrifugation and drying to obtain monodisperse magnetic nanoparticles. According to the method for simply and conveniently preparing the monodisperse magnetic nanoparticles on a large scale, the reaction conditions are convenient to control, product separation and purification are simple and convenient, large-scale preparation of the magnetic nanoparticles can be simply and conveniently carried out, and the sizes of the magnetic nanoparticles can be regulated and controlled through the concentration of oleic acid and the boiling point of a reaction solvent; and magnetic nanoparticles with different sizes can be conveniently prepared.

A process for preparing selenopapain from papain and sodium selenohydride through dissolving papain in phosphate solution, adding excessive sodium selenohydride, seleno substitution under protection of N2, freeze drying, dissolving in phosphate solution centrifugal removal of Se, removing salt, collecting protein peaks, and freeze drying. Its advantages are simple process high activity of glutathion peroxidase, and excellent antioxidizing power.

The invention discloses a synthesis method of N-aryl hydroxylamine acid, wherein the synthesis method comprises the following steps of mixing aniline with aromatic aldehyde, reacting the aniline and the aromatic aldehyde at the room temperature to obtain an intermediate product; dissolving the obtained intermediate product into an organic solvent, adding M-chloroperbenzoic acid, and conducting the reaction at the room temperature, so as to obtain the N-aryl hydroxylamine acid. In comparison with the traditional acyl chloride production methods, the production method provided by the invention has the advantages that the operation condition is milder, the reaction is carried out at the room temperature without rigorous de-watering operations and devices, the separation and purification operations of the obtained intermediate product or final product are simple, and the yield of the final product is as high as 80%, so that the method provided by the invention is suitable for industrial production.

The invention discloses a method for synthesizing ferulic acid by microwave radiation. The method comprises the following steps: adding vanillic aldehyde and anhydrous potassium carbonate to acetic anhydride, evenly mixing the raw materials, and carrying out microwave radiation until a reaction mixture is completely molten into liquid; cooling the molten liquid to room temperature and then adding ice water to mix evenly; standing the mixture for over 24 hours, adding ice water again, fully washing and carrying out suction filtration to obtain a filter cake; hydrolyzing the filter cake in an NaOH solution, and carrying out suction filtration; acidizing the obtained filtrate until the pH is 2-3, carrying out suction filtration, and recrystallizing the filtrate cake by using absolute ethyl alcohol, so as to obtain yellow needle crystal; drying the yellow needle crystal to obtain ferulic acid. Acetic anhydride is a reactant, and also is a solvent; acetic anhydride can react to the maximal extent; anhydrous potassium carbonate is non-toxic and pollution-free; acetic anhydride is taken as the solvent, and can be removed in a washing manner during impurity removal; the requirements of green chemistry are met, therefore, the method disclosed by the invention is short in reaction time, and easy in separation and purification, the productive rate can be up to 68%, and a new direction is provided for preparation of ferulic acid.