122 results about "Starch solution" patented technology

The invention discloses a high-strength water-resistant starch adhesive and a preparation method thereof, and belongs to the technical field of preparation of environment-friendly adhesives. The problems of strength and mildew resistance of the starch adhesive are solved. The preparation method comprises the following steps: preparing 5-10g of polyethyleneimine into a 30-60wt% solution, weighing a certain mass of urea according to a molar ratio of (1-5): 1, adding the weighed urea into the prepared polyethyleneimine solution, and reacting for 8-14 hours in an oil bath to obtain a first branched polymer; 20-50 g of dialdehyde starch and 60-90 g of polyvinyl alcohol are added into a flask to prepare a starch solution, then the reaction temperature is set, uniform stirring is performed for gelatinization treatment, a second gelatinized solution is obtained, and after mixing reaction, a prefabricated high-strength water-resistant starch adhesive is obtained; and adding 5-10 g of cassava starch filler and 5-10 g of polymethyl silicon polyphenyl isocyanate, and stirring for 10-30 minutes to obtain the high-strength water-resistant starch adhesive.

The application discloses a kind of metal-loaded starch aerogel and its preparation method and application, comprising the following steps: (1) starch and water are prepared into starch milk, starch milk is heated, and gelatinized starch solution is obtained;(2) sodium laurate is added to the gelatinized starch solution and heated to react, and after the reaction is completed, starch-sodium laurate complex solution is obtained;(3) metal nitrate solution is added to the above-mentioned complex solution, and after stirring uniformly, a reducing agent is added to reduce metal ions, and metal-loaded starch hydrogel is obtained;(4) the above-mentioned hydrogel is pre-frozen and freeze-dried to obtain metal-loaded starch aerogel.The metal-loaded starch aerogel of the application has excellent ethylene adsorption capacity, with an adsorption capacity of about 32 mL / g, good adsorption stability, and the adsorption process can be carried out at normal temperature and pressure, which can be used for fruit preservation.

The invention discloses a preparation method of a compound microbial fertilizer, and belongs to the technical field of microbial fertilizers, the preparation method comprises the steps of starch gelatinization, strain activation, shake-flask culture, immobilization, fermentation and material mixing; the immobilization comprises the following steps: centrifuging a paenibacillus polymyxa shake-flask culture, and collecting wet thalli; mixing the wet thalli with normal saline, stirring at room temperature, adding the gelatinized starch solution, and continuously stirring to obtain a mixed bacterial solution; stirring a calcium chloride aqueous solution at 30-35 DEG C, dropwise adding the mixed bacteria solution, continuously stirring after dropwise adding, filtering, and taking filter residues to obtain immobilized paenibacillus polymyxa; the compound microbial fertilizer prepared by the invention is high in viable count, and the viable count is slightly influenced by the content of each substance in the corn steep liquor.

The invention discloses a targeted delivery system of a largemouth bass frog iridovirus oral vaccine and a preparation method of the targeted delivery system, and relates to the technical field of biological medicines.The method comprises the following steps that a starch solution and a largemouth bass frog iridovirus inactivated vaccine are stirred and mixed, then a paraffin emulsion is added, stirring and emulsifying are conducted, and a W / O emulsion is obtained; adding calcium chloride, stirring and mixing, centrifuging, and resuspending by using a PBS (Phosphate Buffer Solution) to obtain a microsphere resuspension solution; stirring and mixing with a quaternized chitosan solution, adding glutaraldehyde for crosslinking, centrifuging, and freeze-drying. The invention further discloses a targeted delivery system of the largemouth bass frog iridovirus oral vaccine prepared by the method. The vaccine is orally administered after being microencapsulated, so that the human cost is low, the stimulation to fish bodies is small, the problems of inconvenience in fish administration, low bioavailability of oral administration, instability in gastrointestinal tracts and the like are solved, and the vaccine has an excellent application prospect in the field of LMBV prevention and control.

The invention discloses a collagen membrane as well as a preparation method and application thereof, and belongs to the field of cosmetics. The preparation method of the collagen membrane comprises the following steps: pickling cow leather with lime, washing the pickled cow leather with water, then acidifying the cow leather with hydrochloric acid, washing the acidified cow leather with water, and washing away interfibrous substances until the hardness of the cow leather is 1t; the mmol / g is 0.1 to 0.3 mmol / 100g; cutting the obtained cow leather into particles, rolling the particles by a defibrator to obtain collagenous fibers, then adding a gelatinized acetate starch solution and a gelatinized chitosan solution into the collagenous fibers, and uniformly mixing and kneading to obtain collagenous fiber slurry with the water content of 95-97%; and casting the obtained collagen fiber slurry into a membrane, drying at 50-55 DEG C for 2-4 hours, soaking the membrane in a mixed solution of baking soda and glutamine transaminase for 2-3 seconds, drying at 50-55 DEG C, flushing by adopting a sodium thiosulfate solution, and washing to remove salt, thereby obtaining the collagen membrane. According to the preparation method, crosslinking among collagenous fibers is enhanced, and the structural stability of the membrane is improved.

The present invention discloses an enzymatically modified starch adsorbent and a preparation method thereof, and relates to the field of adsorbent technology. The method comprises the following steps: adding corn starch to deionized water and performing gradient temperature-ultrasound synergistic treatment, first subjecting the pretreated starch solution to cold plasma treatment under a nitrogen atmosphere, adjusting the pH, heating, and then adding a complex enzyme for enzymatic hydrolysis, adding modified sulfonic acid sodium alginate for reaction, and then adding epichlorohydrin and stirring the reaction; then subjecting the solution to cold plasma treatment under a nitrogen atmosphere, adding pretreated attapulgite for reaction, adding ammonium sulfate and acrylamide and excluding air, and then filtering, washing, and drying the solution after the reaction to obtain an enzymatically modified starch adsorbent. The pretreatment of corn starch by the present invention effectively improves the reactivity of starch granules; the introduction of ingredients such as pretreated attapulgite further improves its adsorption capacity and adsorption capacity stability. Therefore, the adsorbent of the present invention has a wider application prospect.

The invention discloses a method for improving the moisture infiltration capacity of urban green land soil. The method comprises the following steps that S1, according to design requirements, a foundation is excavated, earthwork is cleaned, the foundation is leveled and divided in a checkerboard mode, and an air pump device is used for aerating the foundation in checkerboard checks; s2, crushing the construction waste: crushing the engineering muck, the engineering slurry, the engineering waste, the demolition waste and the decoration waste into coarse grains with the grain size of 30-50mm, removing metal in the coarse grains, paving the coarse grains on a foundation, and leveling and compacting to form a permeable layer; s3, a starch solution is injected into the permeable layer, glucose is formed after the starch solution is hydrolyzed in the permeable layer, acetic acid is formed after the glucose is alcoholized, hydroformylated and acidified, and the acetic acid reacts with carbonate in the permeable layer to generate water-soluble substances which are consumed, so that the porosity of the permeable layer is improved. The problem that urban inland inundation is prone to occurring due to the fact that urban green land permeability is poor can be solved.

The invention relates to agricultural production, in particular to a method for evaluating technologies for treating fibrous cotton seeds against disease, and can also be used to create methods for evaluating technologies for treating seeds of other agricultural plants. The essence of the invention is that in the method of assessing the resistance of cotton plants to disease, which consists in cultivating seed materials in an area artificially infected with the pathogen and isolated with polyethylene coating, fibrous cotton plants, on whose outer surfaces a thin coating is created by sequentially applying starch and fungicide and / or fungicide and starch solutions, are cultivated in an artificially infected area.

The invention provides a fully degradable nanocellulose composite liquid mulching film and a preparation method thereof, and the preparation method comprises the following steps: adding hexadecyl trimethoxysilane into a nanocellulose solution, mixing and heating to obtain a hydrophobically modified cellulose solution; adding citric acid and sodium hypophosphite into the starch solution, mixing and heating for esterification reaction to obtain an esterification product, and adding deionized water after the esterification product is cooled to room temperature to obtain a product solution; mixing and stirring a gelatin solution and a dopamine solution to obtain a modified gelatin solution modified by polydopamine; mixing the modified gelatin solution with the product solution to obtain composite gel; mixing, shearing and emulsifying the modified cellulose solution, the composite gel, an emulsifier, a plasticizer and a water-retaining agent to obtain a composite emulsion; alkali liquor is dropped into the composite emulsion to adjust the pH value, then a cross-linking agent is added, and the composite liquid mulching film is obtained after mixing and heating.

The invention belongs to the field of microbial preparations, and particularly relates to a protection method of a microzyme freeze-dried fungicide based on low-liquefied starch. On one hand, the invention provides a freeze-drying protective agent. The freeze-drying protective agent is obtained by carrying out enzymolysis on a starch solution with amylase for 20-200 minutes, centrifuging and freeze-drying. On one hand, the invention provides a protection method of a saccharomycetes freeze-drying bacterial agent, which comprises the following steps: adding the freeze-drying protective agent into saccharomycetes resuspended thalli, standing, removing supernatant to obtain paste, and freeze-drying the paste. By using the freeze-dried microbial inoculum provided by the invention, the survival rate of the saccharomycetes freeze-dried microbial inoculum is remarkably improved.

The application discloses modified emulsified starch and a preparation method thereof and application of the modified emulsified starch to health products for the elderly, and relates to the technical field of starch modification. The preparation method of the modified emulsified starch comprises the following steps: high-temperature liquefaction is performed on starch milk to obtain a liquefied starch solution; the pH of the liquefied starch solution is adjusted, starch amylase is added to perform an enzymolysis reaction, then the residual starch amylase is inactivated to obtain an enzymolysis product; the pH of the enzymolysis product is adjusted, octenyl succinic anhydride is added to perform an esterification reaction, and an esterification modified solution is obtained; and the esterification modified solution is washed and spray-dried to obtain the modified emulsified starch. The modified emulsified starch has a high coating rate for vitamin C, can prevent photo-oxidation of vitamin C, has a good dissolution effect, and is convenient for the elderly to absorb and utilize vitamin C.

The application discloses a preparation method of starch-unsaturated fatty acid compound. The method comprises the following steps: starch is pretreated by a debranching enzyme to obtain a debranched starch solution, the debranched starch solution is mixed with unsaturated fatty acid, an ethanol-water solution is added as a ball milling medium, a multi-stage ball milling parameter dynamic regulation process is adopted, and low-temperature protection, medium-temperature complexing and cooling solidification stage ball milling reactions are sequentially carried out, and finally, drying, crushing and sieving are performed to obtain the starch-unsaturated fatty acid compound. Through the synergistic effect of debranching enzyme pretreatment and multi-stage ball milling, the starch and the unsaturated fatty acid are efficiently compounded under mild conditions. The obtained compound has high compounding rate, high resistant starch content and excellent antioxidant stability. The compound can be used as a low-glycemic index functional food raw material and is used for preparing blood glucose management, weight control or antioxidant functional food. The method is mild, controllable and reproducible, does not need high temperature and high pressure, and meets the clean label consumption trend.

The application provides a wet starch preparation and automatic adding system, which comprises a clean water tank, a starch preparation tank, a quantitative adding system, a ton bag hoisting system and a control system, wherein the water outlet of the clean water tank is connected with the water inlet of a starch water inlet pump through a first pipeline; the water inlet of the starch preparation tank is connected with the water outlet of the starch water inlet pump through a second pipeline; the quantitative adding system is used for adding starch into the starch preparation tank; the ton bag hoisting system is arranged above the quantitative adding system and is used for hoisting and conveying a ton bag of starch to add the starch into the quantitative adding system; the water inlet of a starch water outlet pump is connected with the starch solution outlet of the starch preparation tank; the water outlet of the starch water outlet pump is connected with the starch solution inlet of a mixing machine through a starch solution conveying pipe; and the control system is electrically connected with the starch water inlet pump, the quantitative adding system, the ton bag hoisting system and the starch water outlet pump respectively. The system can effectively realize wet addition of the starch in the process of the gypsum board production, stabilize the production and improve the product quality.

This application relates to the field of papermaking technology, and more particularly to a cationic cassava starch and its preparation method, apparatus, and application. The preparation method involves repeatedly statically mixing 60%–69% etherifying agent with 5%–15% caustic soda solution, adding 35%–42% cassava starch solution within 10–30 seconds, mixing, sieving, and then undergoing an etherification reaction to obtain cationic cassava starch. The apparatus includes an etherifying agent storage unit, a caustic soda solution storage unit, a raw material mixing unit, a cassava starch solution supply unit, a mixing and sieving unit, a reaction unit, controllable valves, a timer, and a control unit. Two storage units are connected to the raw material mixing unit, which is connected to the mixing and sieving unit via valves. The starch solution supply unit is also connected to it, and subsequently to the reaction unit. The control unit regulates the opening and closing of the valves to ensure the mixing of the solution is completed within 10–30 seconds. The application is the use of cationic cassava starch in papermaking. It is evident that the preparation method of this application can avoid gelatinization caused by excessively high local concentration when starch is mixed with alkali solution, and reduce the generation of impurities; the wet process can flexibly control the degree of substitution to adapt to paper machine production, eliminate the drying process, and produce wet cationic tapioca starch with stable degree of substitution, excellent quality, which can be directly supplied to paper machines and has good retention and filtration effects.

The invention discloses a wood fiber-based composite material with a tough interface structure and a preparation method thereof, and the preparation method comprises the following steps: 1) mixing a gelatinized starch solution and a waterborne polyurethane emulsion to form a dynamically stable flow equalizing agent; 2) adding the wood fiber and the coconut shred fiber into hydrogen bond alkalinity beta gt; carrying out colloid milling in 0.5 of a solvent to obtain mixed fibers; and (3) uniformly mixing the flow equalizing agent obtained in the step (1) and the mixed fiber obtained in the step (2) by using a kneading machine, putting the mixture into a mold, and carrying out hot press molding to obtain the composite material. The starch solution and the waterborne polyurethane are prepared and compounded to form the flow equalizing agent, the flow equalizing agent is mixed with the pretreated fibers, and the binding material with high strength and high toughness is prepared through kneading and mold forming. The adhesive combines the adhesion of natural starch and the flexibility of waterborne polyurethane, realizes multi-component synergistic enhancement, and has excellent mechanical properties and environmental protection characteristics.

The chemical formula of a metal organic framework 2D-NCM (Fe) in the magnetic metal-organic framework mediated multi-enzyme nano material GOx-GAA at 2D-NCM (Fe) is Fe3O6Co2Ni2C3N0.4, Gox is glucose oxidase, and GAA is glucosidase. The invention also provides a method for efficiently and quickly measuring the activity of alpha-amylase, which comprises the following steps: acquiring a to-be-measured sample solution containing alpha-amylase, and carrying out enzymolysis on the to-be-measured sample solution and a starch solution at a first preset temperature for a first preset time to obtain a first reaction solution, after the enzymolysis reaction is finished, adding a first solution containing a magnetic metal-organic framework mediated multienzyme nanomaterial GOx-GAA at 2D-NCM (Fe) and a 3, 3 ', 5, 5'-tetramethyl benzidine solution into the first reaction solution, and reacting for a second preset time to obtain a second reaction solution; measuring the absorbance of the second reaction liquid at 652 nm; and obtaining the enzymatic activity of the alpha-amylase in the to-be-detected sample solution containing the alpha-amylase according to a standard curve of association between the absorbance at 652nm and the enzymatic activity of the alpha-amylase.

The present invention discloses a strain of bacillus subtilis producing beta-amylase and its application, belong to the field of bioengineering technology, the bacillus subtilis is named as bacillus subtilis (Bacillus subtilis) JXJY-0811, has been deposited in the General Microbiology Center of China National Committee for the Collection of Microorganisms on June 7, 2024, and the deposit number is CGMCC NO.30886. The present invention uses the clear circle method to screen from soil and obtain bacterial strains that can secrete beta-amylase and amylase activity extracellularly, and is identified as bacillus subtilis through whole genome sequencing. The extracellular beta-amylase suitable temperature conditions of the strain are 50-75 DEG C, suitable pH value is 3.5-6.5, and extracellular enzyme activity is 9640.10U / mL, and after 60 hours of fermentation, the highest enzyme activity of 5L fermentation tank beta-amylase can reach 51980.36U / mL. The beta-amylase obtained by fermentation is used to process soluble starch solution, and the main product is maltose, which can be used for the production of maltose and high maltose syrup.

The present application relates to the field of special medicine, and more specifically, it relates to a thickening component for special medical purposes for dysphagia and gastroesophageal reflux and a preparation method. A thickening component for special medical purposes for dysphagia and gastroesophageal reflux, comprising modified starch and xanthan gum; wherein the mass ratio of modified starch to xanthan gum is (7~9.5):(3~0.5). The preparation method is as follows: fully hydrating the modified starch to obtain a modified starch solution; spray drying part of the modified starch solution to prepare a powder; spraying the xanthan gum solution from the bottom of a fluidized bed to granulate the modified starch powder; spraying the remaining modified starch solution from the top of the fluidized bed to coat the above granulation, and sieving after hot air drying to obtain the finished product. The present application has the advantage of simultaneously improving the symptoms of dysphagia and gastroesophageal reflux.

The invention belongs to the technical field of glass fiber surface treating agents, and discloses a preparation method of a konjac glucomannan modified pea starch glass fiber impregnating compound, which comprises the following steps: adding water into pea starch, and gelatinizing at 85 DEG C for 30 minutes to prepare a pea starch solution; the preparation method comprises the following steps: adding water into konjac glucomannan, and stirring and dissolving at 60 DEG C to prepare a konjac glucomannan solution; mixing the pea starch solution and the konjac glucomannan solution according to a mass ratio of 4: 1, adding a silane coupling agent, and carrying out esterification grafting reaction at 75 DEG C for 1 hour to obtain a mixed solution; and adding a plasticizer, a lubricant and an antistatic agent into the mixed solution, and homogenizing at a high speed to obtain the impregnating compound. According to the preparation method, a pea starch and konjac glucomannan full bio-based system is adopted, the impregnating compound is prepared through a water-phase esterification reaction, the process is simple, the reaction condition is mild, a three-dimensional network is formed through esterification crosslinking of konjac glucomannan linear molecules and pea starch branched chains, and the compactness of a film layer is improved.

This utility model relates to the technical field of starch production equipment, and more particularly to a thickener for soluble starch production, comprising a thickening tank, a fixed frame, and a crossbeam. The fixed frame is fixedly installed at the lower end of the thickening tank, and the crossbeam is fixedly installed at the upper end. Guardrails are installed on both sides of the crossbeam, and a base is installed at the lower end of the crossbeam. A liquefying enzyme spray pipe is installed on one side of the thickening tank, and the other side of the liquefying enzyme spray pipe is fixedly installed in the base. With this thickener, the liquefying enzyme spray pipe can evenly spray the liquefying enzyme onto the surface of the starch solution in the thickening tank, ensuring full contact between the liquefying enzyme and the starch, and improving the liquefaction efficiency of the starch. The nozzle is equipped with an atomizing nozzle, allowing the liquefying enzyme to be sprayed in a fine mist, further improving the liquefaction effect. The layout of the annular electric heating tube can evenly heat the starch solution in the thickening tank, improving heating efficiency and effectively preventing heat waste caused by localized overheating or undercooling of the liquid.

The invention provides a method for enhancing interaction between starch and polyphenol by utilizing starch phosphorylation. The method comprises the following steps: reacting natural starch with a phosphorylation agent to obtain phosphorylated starch; adding the phosphorylated starch into an aqueous solution, adding polyphenol into the obtained phosphorylated starch solution, and storing the obtained phosphorylated starch / polyphenol mixture at low temperature. Natural starch is subjected to phosphorylation treatment under different pH conditions, the content of phosphate groups in the starch is increased, then the treated starch and polyphenol are blended in an aqueous solution to be combined, and the purposes of improving the stability of the polyphenol and achieving protection and slow release of the polyphenol are achieved.

The invention relates to the technical field of food preparation, and discloses a crushing device and method for preparing a surface coating material for frying large meatballs, the crushing device comprises a main body assembly, the main body assembly comprises a preparation pool and an isolation plate, the isolation plate is arranged in the preparation pool, and one side of the preparation pool is provided with a feed opening and a material accumulation groove; and the crushing assembly is arranged in the material accumulation groove and comprises a fixed seat fixed in the material accumulation groove, a supporting shell is fixed in the fixed seat, and a rotating shaft is rotationally connected in the supporting shell. By arranging the crushing assembly, meat particles mixed in a starch solution can be effectively crushed and converted into fine minced meat, so that the problem of meat particle waste is solved, the minced meat can be uniformly attached to the surface of the large meatballs in the process of coating the large meatballs with the coating, the layering sense and the flavor of the coating are improved, and the large meatballs are more delicious. The fried large meatballs are more scorched in fragrance and more unique in flavor.

The baking-resistant improved stuffing comprises the following components in parts by weight: 20-30 parts of a modified soybean starch solution, 10-15 parts of modified dietary fibers, 4-8 parts of konjac glucomannan, 2-12 parts of table salt, 2-10 parts of monosodium glutamate, 5-10 parts of soy sauce, 5-8 parts of xylitol, 4-5 parts of sodium alginate, 10-15 parts of cooked glutinous rice flour, 1-3 parts of malic acid and 10-15 parts of peanut oil. According to the baking-resistant improved stuffing and the preparation method thereof disclosed by the invention, the obtained baking-resistant improved stuffing has excellent baking resistance and ageing resistance, can bring new taste bud experience and rich nutrition to eaters, and is good in mouth feel and taste.

The present disclosure relates to a clean coal for combustion and a preparation method thereof. The preparation method includes the following steps: (1) dispersing starch in water, uniformly stirring, and fully gelatinizing; (2) adding a sulfur-fixing agent into the gelatinization solution, and centrifuging to obtain the starch gelatinized solution containing the sulfur-fixing agent; (3) crushing the coal for combustion to obtain coal particles; and (4) conveying the coal particles to a fluidized bed, spraying the starch gelatinized solution containing the sulfur-fixing agent on the coal particles in a suspension state, and drying to obtain coal particles adsorbed with the sulfur-fixing agent and gelatinized starch. According to the present disclosure, the starch gelatinized solution is used to dissolve the soluble sulfur-fixing agent, and then the starch solution is adsorbed in-situ into the coal particles, so that the soluble sulfur-fixing agent is uniformly adsorbed in the coal for combustion.

Provided are a starch film-forming composition and a preparation method of soft capsules thereof. The starch film-forming composition comprises 25-60 wt% of acid-treated starch, 20-40 wt% of a plasticizer and 15-40 wt% of water, wherein the acid-treated starch has a paste viscosity of 5-196 mPa·s, and the paste viscosity is obtained by preparing a 10% w / w starch solution from the acid-treated starch and water, and the acid-treated starch has a phosphate content of 0.01-0.06% (calculated based on phosphorus P). The soft capsules prepared from the starch film-forming composition have a short drying time and uniform moisture, thereby reducing the production cost of the soft capsules.

The present invention discloses a starch-based medical adhesive and its preparation method and application, specifically relating to the field of biomedical materials technology. The method comprises first adding modified starch 1 to water, heating and stirring in an oil bath for gelatinization to obtain a modified starch 1 solution; adding modified starch 2 to water, heating and stirring in an oil bath for gelatinization to obtain a modified starch 2 solution; then mixing the modified starch 1 solution and the modified starch 2 solution, stirring evenly to obtain a modified starch complex; finally, freezing the modified starch complex at low temperature, freeze-drying it, and crushing the freeze-dried modified starch complex to obtain a starch-based medical adhesive. The medical adhesive of the present invention has good biocompatibility, can be degraded into non-toxic and harmless products in the body, has strong wet tissue adhesion strength and good tissue compliance, is simple to process, can be directly applied to skin wounds, deep wounds, and wounds in areas that are difficult to reach through surgery, and is simple and convenient to use.

The invention belongs to the technical field of starch processing, and particularly relates to a preparation method of jackfruit seed resistant starch based on ultrasonic treatment. Uniformly mixing jack fruit seed starch and plasma activated water to obtain a starch solution; performing ultrasonic treatment on the starch solution, performing gelatinization, then adding gallic acid, performing uniform stirring, performing compounding through a shaking table, performing cooling, performing drying, and performing sieving so as to obtain the jackfruit seed resistant starch. The conditions of the ultrasonic treatment are as follows: the power is 300 to 600 W, the frequency is 40 Hz, and the time is 30 to 60 minutes. The compound with high resistant starch content is prepared by utilizing a synergistic modification method of two physical technologies of ultrasonic wave and plasma activated water. Meanwhile, chemical reagents are not used in the preparation method provided by the invention, and the preparation method can be used in food labeled with clean labels.

This invention discloses a method and application for preparing whey protein isolate microgels based on enzymatic hydrolysis of OSA-modified starch, belonging to the field of emulsion gelation technology. The preparation of the whey protein isolate microgels of this invention includes the following steps: dissolving OSA-modified starch in phosphate buffer, gelatinizing in a boiling water bath, cooling, adding pullulanase for enzymatic hydrolysis, boiling to inactivate the enzyme, then adding β-amylase for secondary enzymatic hydrolysis, centrifuging, collecting the supernatant, and freeze-drying to obtain EOSA starch; preparing whey protein isolate solutions and EOSA starch solutions separately, mixing them at a 1:1 volume ratio, homogenizing, and obtaining the final microgel. The microgel particles have a smooth surface and a uniform gel network structure; they can effectively stabilize the emulsion morphology, exhibiting good storage and thermal stability; furthermore, they are suitable for the preparation of swallowable foods, and the degree of enzymatic hydrolysis of OSA-modified starch can be adjusted to control the swallowability grade, adapting to different swallowability requirements.

The invention discloses silicon dioxide prepared based on a pH oscillation strategy and a method thereof. The method comprises the following steps: S1, preparing a sodium silicate aqueous solution and an acidolysis starch solution; s2, regulating and controlling gel self-assembly according to a pH oscillation strategy; adding the acidolysis starch solution into the sodium silicate solution, and fully stirring and mixing to form a uniform mixed solution; slowly adding an acid solution into the mixed solution, and adjusting the pH value to 2-4; then adding a high-concentration sodium silicate aqueous solution to adjust the pH value to 8-10; adding the acid solution again, and adjusting the pH value to 2-4; s3, aging and washing the gel formed in the step S2; and S4, drying and calcining the washed gel to obtain the high-pore-volume silicon dioxide. According to the invention, the proportion of the silicon source to the biomass template is accurately regulated and controlled, the pH is regulated and controlled to induce the self-assembly of silicon species on the starch template, and the assembly dynamics of the silicon source and the biomass template in the solution is effectively regulated and controlled by adopting a pH oscillation strategy, so that a new way is provided for low-cost and environment-friendly manufacturing of the high-performance porous silicon dioxide material.

The invention discloses a starch-based nanoscale drug loading system and a preparation method thereof, and belongs to the technical field of pharmaceutical preparations. The invention aims to solve the technical problems of nonuniform particle size and morphology of products, potential toxicity caused by use of chemical cross-linking agents, complicated operation, poor universality of a preparation process and the like in the conventional preparation method. According to the key points of the technical scheme, the preparation method of the starch-based nanoscale drug loading system comprises the following steps: starch debranching treatment: adding water into starch to prepare a suspension, gelatinizing the suspension, cooling, and carrying out enzymolysis to obtain a debranched starch solution; adding a medicine: adding an alcohol solution of an alcohol-soluble medicine into the debranched starch solution, and uniformly mixing to obtain a hydrophilic phase; emulsion preparation: mixing the hydrophilic phase with the oil phase, and emulsifying to obtain an emulsion; the oil phase is grease containing a surfactant; and performing freeze drying, centrifugation and separation on the emulsion to obtain the starch-based nano-scale drug loading system.