34results about How to "Achieve hydrolysis" patented technology

The invention provides a method for extracting hydrolyzed collagen from bovine cartilage. The method sequentially comprises the following steps of: processing fresh bovine cartilage which is obtained from a Muslim slaughter house and serves as a raw material with solution of sodium hydroxide; adding papain and alkali protease into the obtained product by stages and simultaneously adding a composite enzymolysis protecting agent into the obtained product; raising temperature for inactivating enzyme after two enzymolysis processes; decoloring by oxidation; filtering and performing ultra-filtering; collecting retained solution; and performing spray-drying on the solution to obtain the hydrolyzed collagen. In the method, the bovine cartilage of the Muslim slaughter house is used as a basic rawmaterial, and other animal derived enzyme preparations are not added during the entire process, so that the Muslim property and no pollution of the product can be ensured.

The invention relates to application of modified PET (Polyethylene Terephthalate) polyester and belongs to the field of modified polyester. The modified PET polyester comprises aerogel particles and polyethylene terephthalate; the aerogel particles are uniformly dispersed among molecular chains of the polyethylene terephthalate; the size of the aerogel particles is 2-3 microns; and the content ofthe aerogel particles in the modified PET polyester is 1-10wt%. The modified PET polyester is prepared by the following steps of adding aerosol powder in ethylene glycol, putting a mixture in a grinder for grinding to prepare a mixed slurry, mixing the mixed slurry with terephthalic acid, and performing esterification reaction and polymerization reaction on a mixture to prepare modified PET; and performing slicing, metering, silk spurting, cooling, oil application, stretching, heat setting and winding formation to prepare modified PET fibers. By introducing the aerogel particles before polymerization of PET polyester, the prepared modified PET is good in spinnability, can be used for producing the modified PET fibers with various thicknesses so as to be wide in application range and can meet the production demands for various fabrics.

The invention provides a fixed bed pipe type reaction device which can realize the catalytic hydrolysis of liquid glycan and the concentration of a sugar liquid at lower reaction temperature. The fixed bed pipe type reaction device comprises a raw material storage tank, a fixed bed pipe type reactor and a sugar liquid storage tank, wherein the raw material storage tank is provided with an agitating device and a device for mechanically sealing the agitating device and is also provided with an air outlet and a liquid outlet; a raw material input pipe is communicated with the raw material storage tank, and a raw material output pipe is communicated with the fixed bed pipe type reactor; an output end of the fixed bed pipe type reactor is communicated with a liquid discharge pipe, a return pipe and a sugar liquid delivery pipe respectively through valves, and the return pipe and the sugar liquid delivery pipe are respectively communicated with the raw material storage tank and the sugar liquid storage tank; and the sugar liquid storage tank is provided with a return concentrating pipe to be communicated with the raw material storage tank. By using the device provided by the invention, the biomass pretreatment step can stay to the extent of generating glycan without further reaction to generate monosaccharide, the energy consumption of the biomass hydrolysis step is greatly reduced,and the economical efficiency of cellulosic ethanol fuel is improved.

The invention discloses a solid silica aerogel with a preparation method having the advantages of implementation in a normal-temperature and normal-pressure environment, short process time, suitableness for industrialization, and improvement of the toughness and the heatproof temperature of silica aerogel. A preparation method of rare earth toughened solid silica aerogel comprises the following steps: adding the prepared silica aerogel precursor (solid silica aerogel) into a drying kettle, filling the drying kettle with nitrogen to remove oxygen until the content of oxygen in the drying kettleis less than 3%, and then carrying out microwave vacuum drying on the material in the drying kettle to obtain the solid powdery silica aerogel. The solid silicon aerogel has an average pore size of 24-26 nm, a specific surface area of 558-588 m<2> / g and a loose specific weight of 0.057-0.061 g / cm, is superhydrophobic and flame retardant, and has a heat conductivity of 0.0196-0.021 W / M.K, a heatproof temperature of 725-920 DEG C and a compressive strength of 0.118-0.125 Mpa.

The invention belongs to the technical field of medicine and provides a preparation method of brain protein hydrolyzate, which comprises the steps of raw material treatment, papain hydrolysis, compound enzyme hydrolysis, pH adjustment, sterilization and nanofiltration. The preparation method of the invention is simple and easy for industrialized production; the cerebroprotein powder prepared by the method has high peptide content and high activity.

The invention discloses a method for purifying and directionally immobilizing histidine tag protein and application. According to the method disclosed by the invention, tannic acid, metal ions and a hydrophilic anti-protein adhesion polymer are self-assembled and modified on the surface of a carrier to obtain a material surface which is efficiently chelated with cobalt ions, so that one-step purification and immobilization of the histidine tag protein is realized; a ligand of trivalent cobalt has inertia and divalent cobalt ions are oxidized into trivalent cobalt ions so that the stability of the immobilized protein can be improved. The method disclosed by the invention has the advantages of simple process and low price; a separation and purification or immobilization operation process for the histidine tag protein of the method is simple and effective, so that the technology has a wide application prospect.

The invention relates to a PET (polyethylene terephthalate) polyester slice with an air purifying function as well as a preparation method and application of the PET polyester slice. The PET polyester slice is prepared from PET polyester, wherein the PET polyester is prepared from aerogel particles and polyethylene terephthalate; the aerogel particles are composite silicon aerogel particles of nanometer titanium oxide and a rare-earth solid solution. The PET polyester slice is bi-directionally stretched to prepare a PET thin film. As a nanoscale titanium dioxide photocatalyst exists in the composite silicon aerogel particles of the nanometer titanium oxide and the rare-earth solid solution in the thin film, the silicon aerogel is used for adsorbing pollutants, such as formaldehyde, and the nanometer TiO2 is used for photolyzing the pollutants, such as the formaldehyde, deposition is preformed while adsorption is performed, a long-term decomposition effect is achieved, and the polyester thin film has the performance of automatically depositing the pollutants in air. When the polyester thin film provided by the invention is paved on vehicle window glass, the air in a vehicle can be effectively purified; when the polyester thin film provided by the invention is paved on window glass or a furniture surface in a building, indoor air can be effectively purified.

The invention provides a fixed bed pipe type reaction device which can realize the catalytic hydrolysis of liquid glycan and the concentration of a sugar liquid at lower reaction temperature. The fixed bed pipe type reaction device comprises a raw material storage tank, a fixed bed pipe type reactor and a sugar liquid storage tank, wherein the raw material storage tank is provided with an agitating device and a device for mechanically sealing the agitating device and is also provided with an air outlet and a liquid outlet; a raw material input pipe is communicated with the raw material storage tank, and a raw material output pipe is communicated with the fixed bed pipe type reactor; an output end of the fixed bed pipe type reactor is communicated with a liquid discharge pipe, a return pipe and a sugar liquid delivery pipe respectively through valves, and the return pipe and the sugar liquid delivery pipe are respectively communicated with the raw material storage tank and the sugar liquid storage tank; and the sugar liquid storage tank is provided with a return concentrating pipe to be communicated with the raw material storage tank. By using the device provided by the invention, the biomass pretreatment step can stay to the extent of generating glycan without further reaction to generate monosaccharide, the energy consumption of the biomass hydrolysis step is greatly reduced,and the economical efficiency of cellulosic ethanol fuel is improved.

The invention relates to a method for increasing reducing sugar yield by coupling of membrane separation and lignocellulose acid hydrolysis. The method is characterized in that hydrolytic reaction and the membrane separation are coupled to realize timely separation of hydrolysate and avoid continuous degradation of the hydrolysate, so that the reducing sugar yield is increased, fermentation inhibitors are prevented from being generated effectively, and subsequent fermentation is facilitated. According to the method, ordinary filtration, micro filtration and ultrafiltration are combined for use organically, the pollution of the hydrolysate to an ultrafiltration membrane is reduced effectively; and as various filter membrane retention substances return to a reaction kettle for continuous hydrolysis, the substrate conversion efficiency and the purity of the hydrolysate are improved, and the reducing sugar yield is increased.

The invention belongs to the technical field of feed additives, and in particular relates to an α-galactosidase soft capsule feed additive and a preparation method thereof. The method comprises the following steps: 1) adding α-Gal to the phosphate buffer solution, then adding β-CD, and then standing for the reaction after homogenization, until the end of the reaction, to obtain the α-Gal-β-CD additive solution; 2 ) adding B-type gelatin into water, adding glycerin, preservatives and titanium dioxide after fully swelling, mixing evenly to gelatinize, and obtaining a rubber compound; 3) filling. The soft capsule additive obtained by the present invention utilizes the inhibitory effect of the cyclodextrin inhibitor on α-Gal, so that the α-Gal enzyme activity in the animal feed undergoes a process of first low and then high, so that the α-Gal in the feed Catalyzes during more favorable periods of digestion.

The invention relates to a method for preparing chemically crosslinked photonic crystal hydrogel with an adjustable color. The method comprises the following steps: (1) dissolving N-isopropylacrylamide, N-hydroxyethyl acrylamide, a cross-linking agent and an emulsifier into deionized water, stirring, warming and keeping warm under the condition at 20-25 DEG C in a nitrogen condition, and then adding an initiator to continue to react for 1-4 hours, and dialyzing, so as to obtain a colloidal crystal hydrogel solution; (2) concentrating the obtained colloidal crystal hydrogel solution, standing at room temperature, adjusting the pH by adopting an NaOH solution, adding a crosslinking agent, evenly mixing, centrifuging, and standing at room temperature after taking, so as to obtain the chemically crosslinked photonic crystal hydrogel. The method is simple in process and low in cost, and the prepared photonic crystal hydrogel has thermosensibility. In addition, the obtained photonic crystal hydrogel is good in stability, and free of hydrolysis, the problem that nano hydrogel is easily decomposed because of ester hydrolysis in 2-hydroxy ethyl acrylate is solved, and the defects of the photonic crystal hydrogel in application are compensated.

The invention discloses a preparation method of a silica aerogel precursor and solid silica aerogel. The preparation method is implemented at normal temperature and normal pressure, and is short in process time, suitable for industrialization and capable of improving the toughness and heat resistance temperature of the silica aerogel. The preparation method of the silica aerogel precursor includes the first step of preparation of a silicon source and solvent mixed solution, the second step of solation, the third step of gelation, the fourth step of ageing, the fifth step of solvent replacement and the sixth step of surface modification. The preparation method of the rare-earth-toughened solid silica aerogel includes the steps that the prepared silica aerogel precursor is put into a drying kettle, nitrogen is introduced into the drying kettle to expel oxygen till the oxygen content in the drying kettle is smaller than 3%, and then materials in the drying kettle are subjected to microwave vacuum drying; after drying, the solid powdery silica aerogel is obtained.