32 results about "D-p-hydroxyphenylglycine" patented technology

The invention relates to the field of pharmacy, and provides an improved method for preparing amoxicillin by an enzymic method, and a product obtained by the improved method for preparing amoxicillin by the enzymic method. The method comprises the following steps of: 1) dissolving 6-aminopenicillanic acid (6-APA) at the temperature of between 10 and 20 DEG C by using water or/and aqueous solution of ammonia which has the pH value of 7.0 to 8.0, and adding D-p-Hydroxyphenylglycine methyl ester hydrochlorid and penicillin G acyltransferase; 2) adjusting the pH value of a solution obtained in the step 1) to be 6.0 to 6.5, and reacting at the temperature of between 21 and 30 DEG C until the content of 6-APA is less than 5mg/ml to obtain a solution of an amoxicillin product; and 3) separating the penicillin G acyltransferase from the solution of the amoxicillin product, adjusting by using hydrochloric acid until the solution of the amoxicillin product is clarified, adding the aqueous solution of ammonia, adjusting the pH value to be 5.5 to 6.5, and crystallizing at the temperature of between 0 and 5 DEG C to obtain amoxicillin. By the improved method for preparing amoxicillin by the enzymic method, the quality of the amoxicillin product is greatly improved, and the medication safety of the amoxicillin product is further improved.

The invention relates to a green method of enzymatic synthesis of cefaclor. The method includes the steps of: (S1) adding a parent nucleus 7-ACCA into a buffer liquid; (S2) under the pH of 5-8, adding a D-p-hydroxyphenylglycinate derivative or a salt thereof and/or D-p-hydroxyphenylglycine amide, and immobilized cefaclor synthesis enzyme, and performing a reaction for 1-3 h at 5-30 DEG C under the pH value of 6.2-7.8; after a certain reaction time, adding a seed crystal to perform crystallization, and when the reaction is finished, separating a reaction liquid and the immobilized cefaclor synthesis enzyme to obtain a cefaclor coarse product; and (S3) acid-hydrolyzing and dissolve-clarifying the coarse product, filtering and re-crystallizing the product to prepare the cefaclor. The enzymatic synthesis method, compared with a conventional chemical synthesis method, is simple in operation, is low in cost, reduces synthetic period, improves production efficiency and total yield, has strong controllability and satisfies industrial production.

The invention relates to a method for preparing cefprozil in a pH responsive regenerative double aqueous phase system. The method comprises (1) preparing two double-aqueous phase systems, (2) orderly adding 7-APRA, D-p-hydroxyphenylglycine methyl ester hydrochloride into the systems, adjusting solution pH to 5.00-6.50 and controlling a solution temperature in a range of 10-30 DEG C, (3) adding immobilized penicillin acylase into the solution obtained by the step (2), and (4) standing the mixed solution, removing the immobilized penicillin acylase, adjusting the pH of the reaction solution, recovering P<ADBA>/<PMDB> and P<ADB>/P<MDB> polymers of the double-aqueous phase systems, feeding the supernatant to a crystallization section, carrying out crystallization, and carrying out centrifugation, washing and drying to obtain a product. The method reduces a chemical synthesis cost, improves a low product conversion rate of the monohydrolase catalytic reaction, effectively improves a yield, simplifies the operation, reduces a cost and realizes easy recovery of the double-aqueous phase systems.

The invention relates to the field of compound synthesis and discloses a method for synthesizing D-p-hydroxyphenylglycine methyl ester. The method comprises steps as follows: (1), in the presence of thionyl chloride, D-p-hydroxyphenylglycine resolving agent salt and methanol have an esterification reaction, and D-p-hydroxyphenylglycine methyl ester resolving agent salt is obtained; (2), the D-p-hydroxyphenylglycine methyl ester resolving agent salt and alkaline metal hydroxide are dropwise added to a D-p-hydroxyphenylglycine methyl ester aqueous solution at the temperature of 10-15 DEG C, the pH (potential of hydrogen) value of a system is controlled in the range from 6.5 to 7 in the dropwise adding process, after dropwise adding of the D-p-hydroxyphenylglycine methyl ester resolving agent salt is completed, alkaline metal hydroxide is continuously dropwise added until the pH value of the system ranges from 7.5 to 8, a crystal is grown at the temperature of 10-15 DEG C and under the condition of the pH value being 7.5-8, an obtained crystalline liquid is filtered, and a D-p-hydroxyphenylglycine methyl ester crystal and a mother liquor are obtained. With adoption of the method provided by the invention, D-p-hydroxyphenylglycine methyl ester with a higher yield can be produced.

The invention discloses a hydroxypropyl-beta-cyclodextrin chiral composite membrane, and applications thereof. A preparation method of the hydroxypropyl-beta-cyclodextrin chiral composite membrane comprises following steps: a polysulfone membrane is immersed in deionized water for two days, is dried vertically in the air, is immersed in a hydroxypropyl-beta-cyclodextrin solution with a concentration of 0.02g/ml, is dried vertically in the air, and is subjected to interfacial polymerization with a 1,6-hexanedioldiisocyanate solution with a concentration of 0.012g/ml; an obtained product is collected, is washed with deionized water after volatilization of reagents on the surfaces, and is dried in that air so as to obtain a chiral composite membrane; and the chiral composite membrane is delivered into a common dialysis device, and d-p-hydroxyphenylglycine raceme solution is separated by concentration difference, wherein purity of d-p-hydroxyphenylglycine enantiomer in a permeate liquid is more than 55%. The purity of the enantiomer obtained via the preparation is relatively high; cost is low; energy is saved; environment is protected; and the preparation method is convenient for continuous operation and large-scaled industrialized production.

The invention discloses a method for recovering D-p-hydroxyphenylglycine (D-HPG) from a cefprozil production waste liquid in an enzyme synthesis process, which comprises the following two steps: 1. separating D-HPG from the crystallization waste liquid through ion exchange by using an ion exchange resin; and 2. purifying and eluting the D-HPG by using hydrochloric acid solutions with different concentrations under the actions of ion exchange and static electricity, and drying to obtain the finished product. The method is characterized in that the process of separating and purifying the D-HPG from the cefprozil production waste liquid in the enzyme synthesis process is completed by using the ion exchange resin, and meanwhile, the subsequent waste liquid treatment technique of the enzyme-process cefprozil synthesis is completed.

The invention discloses a DNA molecule, a recombinant plasmid and a recombinant bacterium for production of D-p-Hydroxyphenylglycine. The DNA molecule provided by the invention comprises a PL promoter, a D-hydantoinase gene and an N-carbamoylase gene, and expression of the D-hydantoinase gene and the N-carbamoylase gene is initiated by the PL promoter. The invention provides the DNA molecule able to stably and massively express D-hydantoinase and N-carbamoylase, and the recombinant plasmid and the recombinant bacterium based on the DNA molecule. At the same time, the invention also provides a method for converting DL-p-hydroxyphenylhydantoin into D-p-Hydroxyphenylglycine by the recombinant bacterium or fermented recombinant bacterium. The method only generates D-p-Hydroxyphenylglycine, has no need of splitting and separating an enantiomer, and the conversion rate is high. The whole production process has the advantages of mild conditions, simple operation, and environmental friendliness.

The invention relates to N-carbamoyl-D-p-hydroxyphenylglycine hydrolase mutants and construction of engineering bacteria thereof. The differences between 5 mutants obtained by orthogenesis and N-carbamoyl-D-p-hydroxyphenylglycine hydrolase respectively lie in that: cysteine at position 193 in an amino acid sequence of N-carbamoyl-D-p-hydroxyphenylglycine hydrolase mutates into asparagine; threonine at position 200 mutates into alanine; asparagine at position 226 mutates into tyrosine; cysteine at position 243 mutates into asparagine; cysteine at position 250 mutates into tyrosine; and engineering bacteria construction is carried out, and the N-carbamoyl-D-p-hydroxyphenylglycine hydrolase mutants and engineering bacteria are applied in D-p-hydroxyphenylglycine production. Compared with wild enzyme, the tolerance to oxygen, tolerance to acid-base and the enzyme activity are greatly improved.

The present invention relates to the field of compound synthesis, and discloses a D-p-hydroxyphenyl glycine (short for DHPG) preparation process, which comprises: synthesizing a DL-para-hydroxyphenylglycine sulfate solution (DL-para-hydroxyphenyl glycine is short for HPG) by using phenol, glyoxylic acid and the like as raw materials; purifying, adding a resolving agent, and performing an asymmetric resolution reaction to obtain a D-p-hydroxyphenyl glycine-phenylethane sulfonic acid double salt; adding an alkali liquid to the obtained double salt in a dropwise manner, and carrying out a hydrolysis reaction and other operations to obtain a D-p-hydroxyphenyl glycine crystal; and carrying out further treatment on the mother liquor containing the resolving agent phenylethane sulfonic acid, andrecycling. According to the present invention, the preparation process is mainly characterized in that the composite catalyst is introduced, and the three steps are eliminated, such that the production cycle is shortened by 12 h; the short synthesis route is short, and the loss is low, such that the yield of D-p-hydroxyphenyl glycine is increased by 7-9%, and the water consumption is reduced by 15-16%; the technical prejudice of the previous D-p-hydroxyphenyl glycine preparation process in the prior art is objectively overcome, and the unexpected effect is achieved; and the D-p-hydroxyphenylglycine preparation process has characteristics of production cost reducing and production efficiency improving, and easily achieves water resource saving and environment protection.

The invention relates to the technical field of pharmacy and chemical industry, in particular to a method for producing D-p-hydroxyphenylglycine. The method for producing the D-p-hydroxyphenylglycine comprises the following steps of: a, preparing a 5 to 10 percent aqueous solution of sodium chloride, and regulating the pH to be 0-3 by using acid for later use; b, adding DL-p-hydroxyphenylhydantoin in an amount which is 30 to 40 percent based on the mass of the solvent, and stirring at the temperature of between 60 and 70 DEG C for 2 to 3 hours; and c, filtering to obtain the D-p-hydroxyphenylglycine. The method for producing the D-p-hydroxyphenylglycine has the advantages of high yield and short reaction time and is simple.

The invention discloses a technology for hydrolyzing D-(-)-p-hydroxyphenylglycine-p-toluenesulfonate, which belongs to the field of the production of pharmaceutical and chemical intermediates and relates to a technology for hydrolyzing a compound having the following structure. The traditional D-p-hydroxyphenylglycine obtained by hydrolysis has low yield (not more than 38 percent) and low quality (the content of not more than 98 percent and the light absorption of not smaller than 0.10), therefore, the cost is higher, and the quality is low without market competitive force. The invention overcomes the defects, improves the yield (not smaller than 45 percent) and the production quality (the content of not smaller than 99.5 percent, the light absorption of not more than 0.050, the optical rotation of minus156-minus 161 degrees and single impurities of not more than 1ppm), has easy acquisition of needed raw materials, lower production cost and simple and easily-applied operation and meets the requirement of enterprise development.

The present invention discloses isolation of Penicillin Acylase (PA) from Achromobacter sp CCM 4824 expressed in recombinant strain E. coli BL21 CCM 7394 bearing the recombinant plasmid pKXIP1 and processing of PA into biocatalyst useful for the industrial synthesis of antibiotics. More particularly the invention discloses a synthesis of semi-synthetic β-lactam antibiotics in the reaction mixture consisting of activated acyl-donor (D-p-hydroxyphenylglycine methyl ester or amide for Amoxicillin and Cefadroxil; D-phenylglycine methyl ester or amide for Ampicillin and Cephalexin) and nucleophile (6-APA or 7-ADCA) catalyzed by PA obtained from recombinant E. coli BL21 CCM 7394 as the biocatalyst.

The invention belongs to the technical field of medicine synthesis and preparation and in particular relates to patent application of a novel cefprozil synthesis and preparation method. The method hasthe technical thought as follows: alkali substitution reaction is carried out on beta-lactam parent nucleus(7-amin-3-(Z-prop-1-enyl)-4-cephalosporanic acid) in an aprotic solvent; then a branched-chain D-p-hydroxyphenylglycine derivative is added to carry out condensation reaction, so that cefprozil is prepared. Totally, the preparation method provided by the invention has the advantages of easiness for obtaining reaction raw materials, moderate reaction conditions and easiness for controlling; after the reaction is finished, the residue of main raw materials is relatively low, the cost pressure caused by the main raw materials can be greatly reduced and the yield of the cefprozil is relatively high; meanwhile, the method has a relatively simple process route and a high-quality cefprozilproduct can be obtained through two-step reaction; the defects of an existing cefprozil preparation method that the yield is relatively low and the quality is not stable can be totally overcome relatively well; the method has relatively good practical value and production and popularization application meaning.