126 results about "Polymalic acid" patented technology

The invention provides mutant aureobasidium pullulans TKPM00006 for massively producing beta-poly(malic acid) and a method for producing poly(malic acid) by using the mutant through fermentation. The strain is the mutant for producing beta-poly(malic acid) with high yield, which is cultured by multiple groups of composite mutagenesis technology based on beta-poly(malic acid) producing TKPM10017 screened in the soil of Wang Taibao orchard, Yinchuan, Ningxia Hui Autonomous Region, China. Under the optimization condition, the yield of beta-poly(malic acid) reaches 18.4+/-1.3g/l.

A structured drug system that is useful for delivering a drug payload to a specific tissue or cell type is disclosed. The system is based on purified polymalic acid. This polymer isolated from natural sources is biocompatible, biodegradable and of very low toxicity. The polymer is extremely water soluble and contains a large number of free carboxyl groups which can used to attach a number of different active molecules. In the examples disclosed N-hydroxysuccinimide esters of the carboxyl groups are used to attach such molecules. The active molecules include monoclonal antibodies to promote specific cellular uptake and specific pro-drugs such as antisense nucleic acids designed to modify the cellular metabolism of a target cell. The pro-drugs are advantageously linked by a somewhat labile bond so that they will be released under specific conditions. In addition, the system contains amide-linked valine to encourage membrane disruption under lysosomal conditions. Polyethylene glycol groups are attached to extend the drug system's circulation half-life. In addition, fluorescent reported groups can be readily included to aid in visualizing and confirming drug system targeting. The drug system can deliver treatments for a wide range of diseases and is specially advantageous for treatment of neoplasms.

The invention relates to a water base reaction type multifunctional metal cleaning agent which consists of a surfactant, a solvent, vegetable oil acid, triethanolamine, sodium salt with a corrosion inhibition function, a corrosion inhibitor, polymalic acid, an antifoaming agent 575, a preservative 1227, deionized water and the like. The metal cleaning agent is non-toxic, harmless, pollution-free, harmless to human body and corrosion-free to the metal surface, avoids peculiar smell and deterioration after long-time use, has excellent cleaning and anti-rust functions, particularly realizes thorough removal of the thick and hard carbon deposit and stubborn stains, does not corrode various types of metals such as cast iron, carbon steel, copper, aluminum and zinc, and is suitable for the cleaning of an ultrasonic machine, cleaning of a spray machine, manual soaking and rinsing and the like; and the natural anti-rust time of the cleaned workpiece exceeds 45 days.

Disclosed is a biodegradable resin composition containing at least one biodegradable organic high molecular compound, a flame retardant additive containing a phosphorus-containing compound, and a hydrolysis suppressing agent suppressing the hydrolysis of the at least one biodegradable organic high molecular compound. An aliphatic polyester resin is polylactic acid, polycaprolactone, polyhydroxy lactic acid, polyhydroxy valeric acid, polyethylene succinate, polybutylene succinate, polybutylene adipate, polymalic acid, polyesters synthesized by fermentation, or a copolymer containing at least one of them. A polysaccharide is cellulose, starch, chitin, chitosan, dextrane, a derivative of at least one of them, or a copolymer containing at least one of them.

This invention discloses a method for preparing amphiphilic chitosan derivative and its pharmaceutical application. The method comprises: connecting acylchlorinated long-chain fatty acid and chitosan by esterification, connecting end-activated poly (benzyl malate) and O-long-chain alkyl chitosan via amido bond, and performing catalytic hydrogenation to remove protective groups and obtain amphiphilic chitosan derivative. The amphiphilic chitosan derivative can form nanoparticles of 100-300 nm in aqueous solution, and has such advantages as high biodegradability, high biocompatibility and easy modification.

The invention provides a novel method for producing beta-polymalic acid by the solid-state fermentation of microorganisms, and relates to a novel process of producing the beta-polymalic acid by using an inert adsorption composite material to the solid-state fermentation of aureobacidium pullulans(at present, the strain is stored in the general microorganism center of China Committee for Culture Collection of Microorganisms, and the CGMCC No. is 3337.). The method comprises the following steps of: selecting a nontoxic inert support which is good in physical water absorption and stable in nature and has a porous structure, evenly mixing the inert support and a liquid culture medium inoculated with the aureobacidium pullulans in a certain ratio, sending the mixture to a solid-state reactor for fermentation, extracting a substrate after the solid-state fermentation with water, and inspecting the content of the polymalic acid. By the method, the fermentation efficiency of the polymalic acid is improved, and the transfer efficiency of oxygen in the fermentation process is enhanced; at the same time, because the inert support can be recycled, the discharge of the solid wastes is greatly reduced; the utilization ratio of the fermentation equipment is high, the fermentation period is short, the products are easy to be separated and extracted, and the yield and purity of the polymalic acid are improved; and the operating cost is low, the economic benefits are obvious, and the industrialized production is facilitated.

Beta-polyoxysuccinic acid and Prussian blue as by-product are prepared by: inoculating activated fungus in fermenting medium for 8-14 days at 24-30 deg.C and 120rpm, separating solid from liquid to remove mycelia, adding alcohol with equal volume to separate Prussian blue deposit and melanochrome, concentrating supernatant and centrifuging with double-volume alcohol to separate Prussian blue, re-concentrating, adding four volume alcohol to deposit beta-polyoxysuccinic acid, and dissolving into water, removing residual melanochrome and micro-molecular materials, and frozen drying to obtain beta-polyoxysuccinic acid, dissolving separated Prussian blue in mixed alcohol-butanone to remove melanochrome, and dialyzing and frozen drying to obtain Prussian blue. It can remove melanochrome effectively to quality purity and reduce pollution by discharged Prussian blue and melanochrome.

The invention discloses aureobasidium pullulans dicarboxylic acid transport protein and a recombinant vector and application thereof. Amino acid sequence of the aureobasidium pullulans dicarboxylic acid transport protein is shown as SEQ ID NO.7, SEQ ID NO.8, SEQ ID NO.9 or SEQ ID NO.10 while nucleotide sequence of the same is shown as SEQ ID NO.1, SEQ ID NO.2, SEQ ID NO.3, SEQ ID NO.4 and SEQ ID NO.5. Overexpression of dicarboxylic acid transport protein in aureobasidium pullulans can increase yield of polymalic acid, and no free malic acid is detected in fermentation liquor, so that dicarboxylic acid transport protein gene is related to synthetic transport of the polymalic acid, and a foundation is laid for increasing yield of the polymalic acid.

The invention discloses an aureobasidium pullulans genome scale metabolism network model and application thereof. Construction of the aureobasidium pullulans genome scale metabolism network model comprises four steps of building of a network database, refining and calibrating of the database, building of a mathematical model and validation and analysis of the model. According to the constructed aureobasidium pullulans genome scale metabolism network model, a gene target for potentially improving polymalic acid can be predicted, a guiding platform is provided for research and comprehensive analysis of aureobasidium pullulans, and the aureobasidium pullulans genome scale metabolism network model has great significance on transformation of the aureobasidium pullulans to obtain high-yield metabolic products of the polymalic acid and pullulan.

The invention discloses a beta-poly malic acid/chitosan nano drug sustained-release microcapsule and a preparation method thereof. The beta-poly malic acid/chitosan nano drug sustained-release microcapsule comprises a core material and a wall material, wherein the core material is a medicine, and the raw material of the wall material consists of beta-poly malic acid and chitosan; and the mass ratio of beta-poly malic acid to chitosan to the medicine in the beta-poly malic acid/chitosan nano drug sustained-release microcapsule is 10:2.5:(3-5). The preparation method comprises the step of preparing the beta-poly malic acid/chitosan nano drug sustained-release microcapsule from beta-poly malic acid, chitosan and the medicine by utilizing a polyelectrolyte self-assembly principle. The beta-poly malic acid/chitosan nano drug sustained-release microcapsule prepared by the preparation method disclosed by the invention has the advantages of homogeneous granularity, good stability, good sustained release effect and no damage to a human body; and the preparation method disclosed by the invention is simple, mild in conditions and suitable for industrial production.

The invention discloses a medium capable of improving a polymalic acid yield. The medium contains 1 to 20g/L of citric acid or citrate. The medium can provide external power donors to aureobasidium pullulans in fermentation, and can improve a cellular ATP supply level thereby improving a polymalic acid yield maximally by 57.1%. The medium can be used for producing polymalic acid by aureobasidium pullulan fermentation and has good economic benefits.

The present invention relates to a water-based heavy-duty multifunction metal cleaning agent, wherein the components in the formula comprise a mixed inorganic salt, a surfactant, isononanoic acid, triethanolamine, a sodium salt having corrosion inhibition function, a corrosion inhibitor, polymalic acid, a defoamer 585, a preservative 1227 and the like. According to the present invention, the metal cleaning agent has characteristics of no toxicity, no harm, no pollution, no damage on human body, no corrosion on metal surface, no odor after long term use, no deterioration, extremely excellent cleaning function and extremely excellent rust resistance, especially and completely cleans thick and hard deposited carbon and stubborn stains, does not corrode various types of cast irons, carbon steels, copper, aluminum, zinc and other metals, and is suitable for ultrasonic machine cleaning, spraying machine cleaning, manual soaking rinsing and the like, wherein the natural anti-rust time of the cleaned work-piece achieves more than or equal to 50 days.

The invention discloses a soil conditioner capable of improving the soil fertility. The soil conditioner is characterized by being prepared from the following raw materials in parts by weight: 6 to 8 parts of ferric sodium edelate, 10 to 15 parts of disodium hydrogen phosphate, 20 to 30 parts of limestone powder, 12 to 25 parts of bamboo powder, 5 to 15 parts of sodium octaborate tetrahydrate, 10 to 20 parts of sugar alcohols magnesium, 10 to 13 parts of crop straw powder, 11 to 14 parts of excrements of livestocks, 5 to 10 parts of potassium chloride, 4 to 8 parts of calcium powder, 1 to 2 parts of alkaloid, 5 to 10 parts of calcium superphosphate and 5 to 7 parts of polymalic acid ester. When the soil conditioner disclosed by the invention is used for planting plants, the usage of a bactericide can be reduced; the pH value of soil can be improved quickly; the organic content in the soil can be increased, and meanwhile, the bamboo powder change into humic acid under the action of ferric sodium edelate and sugar alcohols magnesium, and the granular structure of the soil can be continuously improved; the growth of garden plants can be promoted, and absorption of toxic metal to garden plants in the soil is improved.

The invention relates to a textile oxygen bleaching stabilizer, and belongs to the technical field of textile auxiliaries. The stabilizer comprises the following components by weight: 8-10 parts of tartaric acid, 2-5 parts of polymalic acid, 6-8 parts of polyacrylamide, 20-40 parts of a chelating agent, 2-5 parts of a surfactant and 60-80 parts of water. The textile oxygen bleaching stabilizer provided by the invention has strong pigment adsorption effect and good bleaching effect, and can effectively prevent deposition and adhesion of silicon scale on the fabric surface, and the bleached textile does not gain rough or hard hand feel; at the same time, the stabilizer can effectively control the decomposition rate of hydrogen peroxide, and effectively avoid local holes on fiber and damage to the fiber.

The invention discloses application of polymalic acid or/and salt to preparation of fertilizer, a product prepared from polymalic acid or/and salt and a preparation method. Application ranges of the polymalic acid and salt are broadened by using the polymalic acid and salt to prepare fertilizer, and polymalic acid and salt can be absorbed by crops, cause no secondary contamination to soil, have higher affinity for numerous nutrient elements in fertilizer, can accelerate the formation of root systems of crops, reduce the application quantity of fertilizer, improve the utilization rate of fertilizer and the yield and property of crops, and have a broad application prospect.

The invention discloses a method for preparing beta-polymalic acid of high purity, belonging to the field of the preparation of high-molecular polymer. The method for preparing beta-polymalic acid of high purity comprises the main steps of activation of strains, cultivation of seeds, fermentation culture and separation and purification, and is characterized in that the separation and purification method comprises the following steps of removing of pulan polysaccharide, extraction of rough polymalic acid, removing of polysaccharide difficult to separate in a sample, centrifugal collection of precipitate, and freeze drying. Compared with the existing invention, the method has the beneficial effects that firstly a sample of high purity can be obtained through a simpler method, fewer devices are invested, and the production cost is lower; and secondly the obtained sample has high purity and can lay a certain foundation for subsequent application.

The invention discloses a method for increasing the yield of aureobasidium pullulans synthesized polymalic acid. The method comprises the following steps: culturing seeds, and performing fermental cultivation, namely, adding an active agent consisting of CTTE and DMSO in the fermentation process in different stages, controlling the temperature of the fermentation process by using a stage temperature control method, setting the cultivation temperature to 25-35 DEG C for 0-40 hours, adjusting the temperature to 20-30 DEG C after 40 hours, flowing 0.1-0.14% of CTTE at a logarithmic growth stage in the fermentation process, and flowing 0.06-0.1% of DMSO at the middle fermentation stage. By the adoption of the method, the yield of polymalic acid is increased by improving permeability of cell membranes, the fermentation period is also shortened, the yield of polymalic acid is generally increased by 40%, the production cost is reduced, and the production efficiency is improved.

The invention is a large-scale production and purification of beta-poly(L-malic acid), biodegradable natural polyester of L-malic acid of molecular weight 30,000 to 300,000 from plasmodia of the Physarum family, especially Physarum polycephalum. This will replace previous laborious and uncontrolled production by bioreactor methods of high productivity and quality, especially to obtain pure polymer of high molecular weight. The described 20-liter bioreactor method can be scaled up for industrial purpose at optimal production and minimum growth time to prevent degradation The invention includes the method of isolation of polymalic acid of 100,000 Mn (number-averaged molecular weight) from the culture broth optimized towards high yields of extremely pure polymalic acid. The non-hygroscopic, water and organic solvent-soluble polymer is endotoxin and agglutinin free and ready to use in chemical syntheses. Because of its high molecular weight and purity it offers a wide spectrum of applications in pharmacy and medicine.

A biodegradable resin composition comprising at least one biodegradable organic polymeric compound, a flame retardant additive containing a phosphorous compound, and a hydrolysis inhibitor capable of inhibiting the hydrolysis of at least one organic polymeric compound. As an aliphatic polyester resin, use is made of polylactic acid, polycaprolactone, polyhydroxybutyric acid, polyhydroxyvaleric acid, polyethylene succinate, polybutylene succinate, polybutylene adipate, polymalic acid, microbially synthesized polyester or a copolymer containing at least one of these. As a polysaccharide, use is made of cellulose, starch, chitin, chitosan, dextran, a derivative of any of these or a copolymer containing at least one of these.

The invention relates to a method for producing polymalic acid through continuous fermentation which can be made into resting cells. The implementation steps are as follows: (1) preparation of slant strains; (2) preparation of seed liquid; (3) the above seed liquid is used for inoculation into Fermentation in a 5L aseptic fermenter; (4) Do not control the pH in the early stage of fermentation, and then continuously add NaOH to control the pH of the fermentation broth to 5.0-5.5 after the emergence of mycelium balls; (5) After 55-60 hours of fermentation, the When the glucose concentration is 8-10g/L, stop the fermentation, add fresh medium again, and repeat the fermentation; (6) Resting cell preparation; (7) Use the same fermentation method for resting cell fermentation; (8) Fermentation The solution was filtered with a hollow fiber membrane with a molecular weight cut-off of 6000Da, added an equal volume of absolute ethanol to precipitate, dried and weighed; the yield of polymalic acid was 50-57g/L. The method can effectively reduce the non-optimal economic stage in the fermentation process, and achieve the purposes of shortening the fermentation time, improving the utilization rate of equipment, and reducing the production cost of products.

The present invention relates to methods of drug delivery for the treatment of a condition or disease, such as cancer. In one embodiment, the invention provides a method of preparing a multifunctional nanoconjugate of temozolomide (TMZ) by conjugating TMZ in its hydrazide form to a polymalic acid platform. In another embodiment, the polymalic acid platform is conjugated to a monoclonal antibody to transferrin receptor, a trileucine (LLL) moiety, and/or a polyethylene glycol (PEG) moiety. The present invention relates to methods of drug delivery for the treatment of a condition or disease, such as cancer. In one embodiment, the invention provides a method of preparing a multifunctional nanoconjugate of temozolomide (TMZ) by conjugating TMZ in its hydrazide form to a polymalic acid platform. In another embodiment, the polymalic acid platform is conjugated to a monoclonal antibody to transferrin receptor, a trileucine (LLL) moiety, and/or a polyethylene glycol (PEG) moiety.

The invention relates to a preparation method of cigarette paper additive, which belongs to the field of paper chemicals and comprises the following steps that: dispersing polymalic acid into water by 0.5 to 20mg/ml; dripping KOH solution into the water solution of the polymalic acid, and stirring the mixture; adding the water solution of metal salt into transparent solution and stirring, increasing the temperature to 40 to 60DEG C, maintaining the temperature for 1 to 2h, reducing the temperature of reaction solution to 20DEG C, slowly dripping the reaction solution into acetone while stirring, precipitating, filtering, and washing and drying a filter cake sequentially with acetone and ether; the ratio of the materials of the steps is respectively as follows: polymalic acid: KOH=100:4 to 40, m/m; KOH:metal salt=100:6 to 70, m/m; and the metal salts is one or more types of zinc acetate, zinc lactate, iron lactate, ferric citrate, germanium manganese acetate and tartaric acid. The preparation method of the cigarette paper additive has simple method and mild reaction conditions, and the prepared cigarette paper additive can be quickly dissolved in water.