11results about How to "Avoid excessive degradation" patented technology

The invention relates to the technical field of compound extraction, in particular to a control method and system for ultrasonic-assisted extraction of high-purity flavonoid compounds. According to the method, preparation conditions are optimized according to material characteristics, then ultrasonic treatment is carried out by adopting a segmented control strategy, meanwhile, the extraction process is tracked in real time through chromatographic detection, process parameters are adjusted in time based on the change trend of an efficiency curve, blindness of a traditional fixed parameter control mode is avoided, and the efficiency is improved. Through intelligent dynamic adjustment, the energy utilization efficiency is remarkably improved, excessive degradation of effective components is effectively prevented, and the control accuracy of the extraction process is improved.

The invention discloses modified chickpea starch and a preparation method and application thereof, and belongs to the technical field of food processing.The modified chickpea starch is obtained by adding oat beta glucan into chickpea starch, then conducting pretreatment on the chickpea starch, conducting extrusion treatment on the chickpea starch through a double-screw extruder, and cooling, drying and smashing an extruded sample; wherein the addition amount of the oat beta glucan is 3 to 15 percent; the temperature of the extrusion treatment is 80-120 DEG C. The chickpea starch is subjected to compound modification by adopting a twin-screw extrusion technology in cooperation with oat beta glucan, and a starch semi-crystalline layer is deeply destroyed to realize deep regulation and control of a multi-scale structure; meanwhile, the oat beta glucan and the starch form a hydrogen bond network, so that the problem of excessive modification of chemical modification is avoided, and the thermal stability, the shear resistance and the aging resistance of the starch are remarkably improved; no chemical reagent participates in the whole process, no chemical residue risk exists, and the method has the advantages of continuous production, large treatment capacity, low energy consumption and the like.

The invention discloses a structure-enhanced starch-based aerogel capable of improving porosity as well as a preparation method and application thereof, the aerogel comprises enzyme modified starch and natural starch, and the enzyme modified starch is obtained by improving the natural starch by adopting a compound enzyme system composed of multiple amylases. The method comprises the following steps: S1, modifying natural starch through a compound enzyme system to obtain enzyme modified starch; s2, mixing the enzyme modified starch with natural starch in proportion, adding water to form a composite suspension, and performing gelatinization treatment to obtain a gelatinized starch system; and S3, carrying out gelation, freezing and drying treatment on the gelatinized starch system to obtain the aerogel. The aerogel can be applied to thermal insulation materials, adsorption materials, bio-based structural materials or functional porous materials. The molecular structure of the starch is controllably adjusted through the synergistic effect of different enzyme systems, so that the porosity, the structural uniformity and the mechanical stability of the aerogel are remarkably improved on the premise of not introducing a chemical cross-linking agent.

This invention provides a method for preparing a modified konjac emulsifier, relating to the field of konjac processing, comprising: step S1, pretreatment; step S2, preparation of precursor solution; step S3, segmented deacetylation; step S4, preparation of gel particles; step S5, hydrophobic anchoring pretreatment; step S6, graded enzymatic esterification; and step S7, purification and drying. This method, through multiple modifications of konjac glucomannan, obtains a modified konjac emulsifier, effectively solving the problems of strong hydrophilicity and poor emulsifying properties of konjac glucomannan.

This invention discloses a precursor of a monochlorotriazine halogen amine antibacterial agent for low-temperature, low-salt finishing, its preparation method, and a cotton fabric and finishing method thereof. The precursor incorporates a 5,5-dimethylhydantoin derivative group linked by a hydrophilic group of sodium p-benzenesulfonate and an ether bond, and is prepared by a temperature- and pH-controlled reaction of cyanuric chloride with sodium p-aminobenzenesulfonate and 3-(3-chloro-2-hydroxypropyl)-5,5-dimethylhydantoin. The cotton fabric finishing process involves precursor dissolution, neutral salt impregnation, low-temperature weak alkali grafting, and chlorination. The process includes impregnation at 25-40°C and alkali reaction at 15-35°C, with a neutral salt concentration of 20-60 g / L and an alkali concentration of 0.5-2 g / L. The precursor has excellent water solubility and fiber compatibility. The finishing process inhibits hydrolysis and reduces energy consumption. The treated cotton fabric has a kill rate of over 99.99% against Staphylococcus aureus and Escherichia coli within 1 minute. After 50 washes, the active chlorine recovery rate exceeds 80%. It has high strength retention, is energy-saving, environmentally friendly and easy to industrialize.

The present invention relates to a chitosan oligosaccharide fermentation control method and system, and relates to the technical field of fermentation control, including: obtaining a fermentation control parameter space, randomly generating multiple initial fermentation control parameters, performing chitosan dissolution analysis according to the initial pH and initial chitosan concentration in the initial fermentation control parameters, obtaining multiple initial chitosan dissolution parameters, performing contact analysis between enzyme and chitosan, obtaining multiple initial chitosan contact parameters, performing contact analysis between enzyme and oxygen, obtaining multiple initial oxygen contact parameters, respectively combining multiple initial fermentation times to perform chitosan oligosaccharide fermentation prediction, obtaining multiple fermentation yield parameters and multiple overdecomposition parameters, and calculating multiple initial fermentation fitnesses; continuing to perform iterative optimization of fermentation control parameters, obtaining optimal fermentation control parameters, and performing chitosan oligosaccharide fermentation control. The present invention achieves the technical effect of considering the contact between enzyme, chitosan and oxygen, optimizing chitosan fermentation control and improving fermentation effect.

This invention provides a method for preparing germinated oat flakes based on a pretreatment with a medicinal and edible extract, comprising the following steps: S1, treating medicinal and edible components to obtain a medicinal and edible extract; S2, adjusting the pH of the medicinal and edible extract to 4.0-8.5, and adding cellulase to the extract to obtain an enzyme-containing extract; soaking washed oat grains in the enzyme-containing extract to obtain soaked oats; S3, germinating the soaked oats to a predetermined sprout length to obtain germinated oats; S4, steaming the germinated oats using steam generated from the medicinal and edible extract; S5, drying and pressing the steamed oats to obtain germinated oat flakes. The medicinal and edible components include plant materials containing polysaccharides and phenolic compounds.

The present invention discloses a variable interval control method for heat and electricity coordination of an off-grid integrated energy system, relates to the field of integrated energy systems and automatic control technology, solves the technical problems that the system electric side tracking control under the traditional tracking control scheme is not flexible and fast enough, and the system thermal load deviates from the set value for a long time under the traditional interval control scheme. The key points of the technical solution are that the flexibility and rapidity of the electric side tracking control can be effectively improved by appropriately relaxing the thermal side control requirements during the dynamic adjustment process; by constructing a dynamic interval width change mechanism, the active conversion of the thermal side optimization space to the electric side is realized, and the excessive degradation of the thermal side control performance is avoided while realizing the rapid and stable tracking of the user's electric load demand.

The invention relates to the technical field of leather processing, and discloses a crocodile skin desquamation method which comprises the following steps: step 1, preparing raw materials: soaking and degreasing crocodile skin, and taking the crocodile skin as a weighing basis; 2, pretreatment: treating 300% of water, 1% of a penetrant and 2-4% of an alkali expansion inhibitor A for 60 minutes; 3, desquamation: adding 2-4% of sodium sulfide and 2-3% of sodium hydroxide, treating for 18-24 hours, and draining; and 4, washing with water. According to the method, the penetrant and the alkali expansion inhibitor are added in proportion for pretreatment, the high pH value is inevitable in order to guarantee the descaling effect, but the crocodile skin can be prevented from being excessively degraded under the high pH value by inhibiting alkali expansion, the descaling effect is guaranteed, the crocodile skin can be prevented from being excessively damaged, and unity of contradictions is achieved.

The present application provides a kind of irradiation crosslinking collagen injection filling agent and its preparation method and purposes.The collagen injection filling agent includes collagen gel microparticle, the collagen gel microparticle has porous structure;The collagen gel microparticle has connected fiber structure, the fiber structure is formed by collagen self-assembly, and the fiber structure includes fiber bundle and / or fiber mesh lamellar structure;The collagen gel microparticle in the collagen injection filling agent of the present application has the fiber structure formed after collagen self-assembly, i.e. collagen is spontaneously assembled from collagen molecule to fiber bundle and fiber mesh lamellar structure, and the degradation rate is delayed.The fiber network structure of the present application has good mechanical support and slow degradation rate, and simulates the three-dimensional microenvironment of natural extracellular matrix (ECM), promotes cell adhesion proliferation and tissue regeneration.The fiber structure of the present application is beneficial to the crawling proliferation of cells, and promotes the regeneration and repair of skin cells.

The invention discloses a continuous preparation method for preparing a p-hydroxycinnamic acid product through lignocellulose hydrolysis, a high-pressure single-screw extruder is used as a reaction device, and the reaction device comprises a biomass feeding unit, a feed mixing module, a screw reaction unit, a heating module, a product collecting unit and a cooling module. In the feeding unit, biomass is conveyed into a mixing module through a screw, is uniformly mixed with pumped alkali liquor and then is conveyed to a heated screw reaction area. The rotating speed of the screw is adjusted to control the reaction retention time, the reaction product is cooled in the collecting tank and collected into the product storage tank, the heat and mass transfer efficiency of the reaction process is improved by utilizing the transmission and mixing effects of the screw reactor, the hydrolysis preparation of the target product from the biomass can be completed within several minutes, the production efficiency of the target product is high, and the production cost is low. Continuous production is facilitated, the operation is simple, the labor cost is low, and technical support can be provided for producing ferulic acid and p-coumaric acid through high-value utilization of agricultural and forestry wastes.