314 results about "Curdlan" patented technology

In order to provide a composition having a long gastroduodenal residence time and exhibiting an improved efficacy, is provided a gastrointestinal mucosa-adherent composition comprising an active ingredient and a material which swells a viscogenic agent capable of being viscous with water a (e.g. curdlan and/or a low-substituted hydroxypropylcellulose etc.).

The invention discloses a plant starch-chitosan composite packaging film and a preparation method thereof, and relates to the technical field of packaging films. The plant starch-chitosan composite packaging film comprises raw materials in parts by mass as follows: 90-100 parts of plant starch, 50-60 parts of chitosan, 25-30 parts of rhizoma coptidis, 20-25 parts of rosemary, 15-20 parts of konjak powder, 15-18 parts of sodium alginate, 12-15 parts of polyvinyl alcohol, 12-15 parts of epoxidized soybean oil, 10-12 parts of low-methoxy pectin, 8-10 parts of calcium citrate, 8-10 parts of curdlan, 6-9 parts of edible gelatine, 5-8 parts of genipin, 4-6 parts of polyglycerol fatty acid ester, 3-5 parts of edible essence and 1,000-2,000 parts of water. According to the plant starch-chitosan composite packaging film and the preparation method thereof, the plant starch and the chitosan are taken as main raw materials, and the production cost is reduced; various coalescing agents with edible safety and an extracting solution of a Chinese herbal medicine rhizoma coptidis and rosemary are added, so that the prepared packaging film has better physical and mechanical property, barrier property and anti-oxidation function and can be used for packaging various kinds of food.

The invention discloses a medium-high temperature resistant biological profile modifying/water plugging agent for oilfield exploitation. The medium-high temperature resistant biological profile modifying/water plugging agent consists of a microbial polysaccharide base profile modifying agent and delay gel, wherein the microbial polysaccharide base profile modifying agent is a microbial polysaccharide curdlan compound hydrogen bond binding force accelerant or microbial polysaccharide curdlan and a coagulant aid; the delay gel is one or more of polyhydric alcohol, high-molecular polymer hydrolysis polyacrylamide and gluconate. The invention further discloses a preparation method for the biological profile modifying/water plugging agent. The profile modifying/water plugging agent disclosed by the invention can be used for keeping the mobility of the system at a medium-high temperature (65-90 DEG C); moreover, the viscosity is increased slowly, so that the needs of smoothly conveying the profile modifying/water plugging agent to a special underground depth part are met.

The invention discloses edible composite cling film, and a preparation method and application thereof. The composite film is prepared by the following steps: adding a polyvinyl alcohol solution, a chitosan solution, a phenolic acid substance and a plasticizer in an edible polysaccharide Curdlan suspension, adjusting the pH value of the mixed solution to 3-5, carrying out ultrasonic degassing to obtain a film-forming liquid, pouring the film-forming liquid into a polytetrafluoroethylene plate, carrying out heat preservation for carrying out a reaction for 8-10 minutes at a temperature of 90-120DEG C, carrying out sizing, carrying out sterilization treatment, carrying out ultraviolet irradiation treatment for 5-10 minutes, carrying out hot-air circulating drying treatment at a temperature of 90-120 DEG C for 30-60 minutes, and carrying out cooling at a temperature of 4 DEG C to obtain the edible composite cling film. The edible composite film provided by the invention has the advantagesof high tensile strength and high extensibility, has excellent integrity, tensile strength and extensibility after being stewed in boiling water for 1 hour, and can effectively prolong the shelf lifeof fruits, vegetables and the meat products.

The invention discloses a polysaccharide-based silver nano-particle preparing method and relates to the technical field of preparation of silver nano-particles. Prepared oxidized curdlan with the carboxyl group content 2.07-4.87mmol/g and a silver nitrate solution are mixed in an isopyknic mode to form a mixed solution, the mixed solution reacts under the magnetic stirring at the constant temperature of 70-100 DEG C for 0.5-2h and then is cooled to be at the room temperature, filtered, centrifuged, dispersed, dialyzed and freeze-dried to prepare polysaccharide-based silver nano-particles, and spherical silver nano-particles controllable in particle diameter can be obtained by controlling the concentration of the oxidized curdlan, the carboxyl group content and the silver nitrate concentration. Therefore, the polysaccharide-based silver nano-particle preparing method is environment-friendly, simple and easy to operate and enables the silver nano-particles to be controllable in particle diameter, evenly dispersed and good in stability, and continuous large-scale production can be achieved.

The invention discloses a polysaccharide/alcohol soluble protein composite membrane and a preparation method of the polysaccharide/alcohol soluble protein composite membrane. According to the polysaccharide/alcohol soluble protein composite membrane and the preparation method of the polysaccharide/alcohol soluble protein composite membrane, polysaccharide (including curdlan or curdlan/ konjac glucomannan mixed polysaccharide) and alcohol soluble protein (including wheat alcohol soluble protein or corn alcohol soluble protein) are taken as raw materials, a plasticizer and an emulgator are taken as auxiliary elements, tape casting and drying are conducted after blending modification is conducted according to a physical method, and then the polysaccharide/alcohol soluble protein composite membrane is obtained. The raw materials of the composite membrane are natural renewable resources and are abundant and easy to obtain. The polysaccharide/alcohol soluble protein composite membrane prepared with the method is flat and smooth, has excellent mechanical property and barrier property and is high in water vapor permeability, oxygen permeability and light transmittance, capable of being degraded naturally and rapidly and free of poison and pollution. The polysaccharide/alcohol soluble protein composite membrane can be used as a food packaging film or a sustained-release material for food or drugs.

The invention discloses a milk beverage stabilizing agent, an acid milk beverage using the same and a preparation method in the technical field of food. The milk beverage stabilizing agent comprises the following components in percentage by mass: 50%-70% of carboxymethyl curdlan, 10%-30% of Arabic gum, 10%-20% of propylene glycol alginate and 5%-10% of guar gum. The acid milk beverage comprises the following components in percentage by mass: 1%-8% of whole milk powder or defatted milk powder, 0.2%-1% of stabilizing agent, 10%-20% of white granulated sugar and the balance of water. The preparation method for the acid milk beverage comprises the following steps: taking 35 to 55 DEG C water, adding the white granulated sugar and the stabilizing agent into the water in turn, and stirring the mixture till the white granulated sugar and the stabilizing agent are dissolved to obtain solution A; taking the 35 to 55 DEG C water, adding the whole milk powder or the defatted milk powder into the water, and stirring the mixture till the whole milk powder or the defatted milk powder is dissolved to obtain solution B; and mixing the solution A and the solution B, cooling the solution to between 15 and 25 DEG C, adjusting pH to 4 by using citric acid solution, and heating, homogenizing and pasteurizing the solution to obtain the acid milk beverage. Because the carboxymethyl curdlan and the Arabic gum are introduced into the stabilizing agent, the stabilizing agent has good emulsifying effect and acid resistance, and can effectively improve the stability of a product.

The invention relates to an exopolysaccharide generated by pseudomonas, a culture method and application. The pseudomonas sp. QL212 is preserved in common microbe center of China Committee for Culture Collection of Microorganisms on September 12, 2014, at the address of Institute of Microbiology of Chinese Academy of Sciences, No.3, Yard No. 1, West Beichen Road, Chaoyang District, Beijing, and having the preservation number of CGMCC NO.9651. The curdlan synthesized by the pseudomonas sp. QL212 serves as the exopolysaccharide; through fermentation condition optimization, the yield of curdlan is up to 5.94 g/L which is higher than the production peak of the already known pseudomonas curdlan.

The invention provides a solvent method for extracting and making curdlan, relating to the purification and extraction as well as production technique of curdlan products. The technical proposal is as follows: (1) an organic solvent such as alcohol and isopropanol is taken as a dehydrating agent to dehydrate the curdlan aqueous alkali, the gel phenomenon does not exist in the production process, thereby being easy to remove water, salinity and pigment; (2) after the curdlan and the organic solvent are mixed, the solid and liquid are separated by adopting the layered overflow way; (3) the organic solvent is applied for a plurality of times to extract the curdlan with a plurality of times of dehydration. The method adopts the organic solvent method to purify and extract as well as produce the curdlan, and has an extracting yield more than 90 percent; the product has high purity quotient and good quality; the production process can realize the serialization and the automation.

The invention belongs to post-extraction of microbial polysaccharide, and in particular relates to a post-extraction method of curdlan. The method comprises the following process steps: fermentation broth enzyme treatment, membrane treatment, first dissolution, sedimentation and filtration, secondary dissolution, sedimentation and filtration, drying and the like. By using the method of the invention, the technical defects in the prior art that high production cost is high because of the adoption of alcohol extraction and large potential safety hazard exists in the production process are solved. The post-extraction method of the invention can be used for effectively removing thallus and impurities and has the advantages of rapid extraction schedule, small influence on material quality, safe production and low cost.

The invention relates to a cholesteryl-carboxymethyl Curdlan nanometer particle and a preparing method. Cholesterol and carboxymethyl Curdlan are used as raw materials. The carboxyl of the carboxymethyl Curdlan is activated by 1-(3-dimethylaminopropyl)-3-ethylcarbodimide hydrochloride (EDC.HCl) and N-hydroxysuccinimide (NHS) firstly, and then reacts with the cholesterol to be synthesized. The mole proportion of the carboxymethyl Curdlan to the cholesterol to EDC to NHS is 1:(0.2-5):1:5. The prepared amphipathic polymer is beneficial to preparing nanometer particles and entrapping hydrophobic drugs. The invention has the advantages of simple preparing method, good reproducibility, high drug entrapping efficiency and easy industrial production, the drug entrapping particle can greatly prolong the action time of the drugs in human bodies, obviously change the distribution of the drugs in different organs, and achieve the functions on reducing toxic or side effect, prolong the circulation time in the human bodies and enhances the biological availability of the drugs.

The invention relates to a compound curdlan colloid and belongs to the field of food processing. The compound colloid is characterized by being prepared by virtue of compounding the following components in percentage by weight: 54.1 percent of curdlan, 8.1 percent of guar gum, 16.2 percent of xanthan gum and 21.6 percent of trisodium orthophosphate. The compound curdlan colloid has the beneficial effects and advantages that because the curdlan belongs to a macromolecule polymer generated from a microbial fermentation saccharic raw material, the curdlan has a better synergistic effect when being compounded with the guar gum and the xanthan gum, and when the curdlan is applied to the meat product, the tissue structure of a product can be remarkably improved, the elasticity of the product is enhanced, the mouth feel is improved, and thus the outward appearance of the product is improved.

The invention relates to the technical field of food processing, in particular to composite gel and a cereal suspension beverage and preparation methods thereof. The composite gel is prepared from curdlan, gellan gum, sodium carboxymethyl cellulose and water. The gellan gum, the sodium carboxymethyl cellulose and the curdlan are used in a matched way; then, the obvious cooperative and synergistic effects can be achieved; the water preservation performance of the gel can be obviously improved. The cereal suspension beverage product provided by the invention belongs to a particle suspension cereal beverage processed by using husked mungbean, oat, coix seeds, white granulated sugar, fruit juice, curdlan, gellan gum, sodium carboxymethyl cellulose, pigments and food flavoring through a scientific and reasonable processing process. The product has the advantages that nutrition and health are realized; the mouthfeel is fresh and cool; the stability is high; the mungbean grains in the product have mild color; the curdlan particles have high elasticity; the beverage is suitable for common people to drink.

A preparation method of thermally irreversible gel protective film of bird's nest and its application in the processing of fruity bird's nest beverage. After mixing the hot solutions in equal proportions (or using curdlan, sodium alginate and other thermally irreversible gels as raw materials), put the stewed and drained bird's nest into soaking for 15-30 minutes, remove and cool (cool at room temperature, dry with cold wind) , ice water bath, etc.) to form a heat irreversible gel protective film; the weight composition of the fruity bird's nest drink is: bird's nest 0.3%~1.5%, fruit juice 3%~15%, sweetener 3%~8%, acidity regulator 0.005%~0.2%, thickener 0.09%~0.15%, essence 0.1%~0.3%. The present invention applies the thermally irreversible gel to the processing of the bird's nest beverage, which not only helps to maintain the appearance and taste of the bird's nest, but also has good flavor and color, is sweet and sour, and is suitable for all ages.

The invention discloses a method for purifying curdlan by use of a membrane separation process. The method comprises the steps of dissolving curdlan fermentation broth or a crude curdlan product in an alkaline solution; by means of the principle that curdlan molecules completely stretched in an aqueous solution can pass through a microfiltration membrane with an aperture higher than 10 nm and microbial bacteria and insoluble impurities can not pass through the microfiltration membrane and the advantage that a ceramic microfiltration membrane is resistant to acid and alkali, separating and removing the microbial bacteria and insoluble impurities in curdlan aqueous alkali by filtering through the ceramic microfiltration membrane, collecting to obtain clear curdlan aqueous alkali with relatively low concentration, adding acid in the clear curdlan aqueous alkali for neutralization to separate out the curdlan in the form of neutralization gel, filtering and concentrating by using an ultrafiltration membrane to obtain the curdlan neutralization gel, adding water to wash and desalt, and finally dewatering and drying through an organic solvent to obtain a high-quality curdlan product. The dry purity of the product exceeds 95%, the gel strength is increased to 1000-1200 g/cm<2>, and the performance is stable.