43results about How to "Prevent oxidative denaturation" patented technology

The invention provides a haematococcus extract preparation, and a preparation method and use thereof. A haematococcus extract soft capsule provided by the invention comprises the contents of haematococcus extract and an oleic phase, wherein the astaxanthin content of the haematococcus extract is 2 to 20 percent (w/w); and the mass-to-volume ratio (g/mL) of astaxanthin in the haematococcus extract and the oleic phase is 1-10:100. The invention also provides the method for preparing the haematococcus extract soft capsules. Experiments show that the haematococcus extract soft capsule provided by the invention has stability remarkably superior to that of the haematococcus extract and conventional products and is of great importance to the application of the astaxanthin to antioxidation, the enhancement of immunity, the suppression of tumorigenesis, the prevention and treatment of cardiovascular disease, the prevention of skin aging and the maintenance of health of eyes and the central nervous system.

The invention discloses a system for measuring the wettability of high-temperature and high-chemical-activity liquid metal lithium. The system comprises a vacuum chamber, a vacuum air-extraction and measurement system, a sample table, a heating system, a sample driving system, a liquid lithium dropping-in system, a light source, a camera and an image processing system. The oxidization denaturation of the surface of the liquid lithium is stopped in a high-vacuum environment; the liquid lithium dropping-in system with ingenious design implements dropping-in of the liquid lithium; a heating wire and a temperature measurement system are arranged on the sample table in a sheathed manner, so that a requirement on the measurement of the wettability of the high-temperature liquid lithium is met; a contact angle of the liquid lithium on a substrate is measured by an image analysis method and through a programmed Matlab batch processing program. The system provided by the invention can be used for quickly, economically and effectively testing the wettability of the high-temperature and high-chemical-activity liquid metal lithium to the surface of the substrate and supplies excellent experiment and data accumulation to possible application of a first wall of the liquid lithium to a future fusion reactor.

A process for breaking the wall of ganoderma sporophyte and extracting includex mixing the ganoderma sporephytes with solvent, ultrasonic pretreating and high-pressure treating under 250-550 MPa for 5-20 min.

Oxidation resistant bioprosthetic tissues and oxidation resistant bioprosthetic heart valve leaflets are described. Also provided are methods for preparing the oxidation resistant bioprosthetic tissues and bioprosthetic heart valve leaflets, and methods for preventing oxidative degeneration in bioprosthetic tissues, including immobilizing covalently an effective amount of an antioxidant to the bioprosthetic tissue.

The invention relates to a microfiber collagen hemostatic material and a preparation method thereof. The preparation method of the material includes the first step of sodium sulfide unhairing, the second step of shredding and fibrosis, the third step of swelling control, the fourth step of drying, the fifth step of depolymerisation and fluffing, and the sixth step of Co60 radiation sterilization, wherein in the fifth step, the obtained fasciculus is treated using a hammer mill to obtain a microfiber collagen product. According to the method, the use concentration of sodium sulphide is reduced, the efficiency of unhairing is improved, and degreasing and impure protein removal are effectively conducted; collagen materials are not oxidized and degenerated, the activity of microfiber collagen is easy to maintain, and the hemostatic effect is improved. Acid is introduced in the treating process, the degreasing and protein removal are more effective, and the adhesion property of the hemostatic material is guaranteed.

The invention relates to a preparation method to extract the high level conjugate unsaturated trienic acid from the guava seed. The process includes: the guava seed is filled into the extraction kettle to extract the oil by the CO2 after breaking up the guava seed, then the CO2 fluid flow into the rectifying column to purify and remove the impurity and other saturated fatty acid or single unsaturated fatty acid, next to separate the other impurity and CO2 in the separative kettle. The process compounds the supercritical extraction, the subcritical extraction and the rectification. So it can prevent the denaturation of the conjugate unsaturated trienic acid and polluting the product, at the same time it can get the high content conjugate unsaturated trienic acid.

The invention discloses a white copper-based antibacterial master batch for fibers, and a preparation method thereof. The antibacterial master batch comprises 0.4-15% of a white copper-based alloy nano-powder antibacterial agent, 0.2-1.5% of a lubricant, 0.2-1.5% of an antioxidant, 0.2-1.5% of a dispersant, and the balance of matrix resin, and the average particle size of the white copper-based alloy nano-powder antibacterial agent is 200-700 nm. The white copper-based antibacterial master batch for fibers provided by the invention has the characteristics of good antibacterial broad spectrum, good color uniformity and consistency, wide dyeing range, low color matching difficulty and low cost, and the preparation process equipment is simple, convenient, efficient, high in repeatability and wide in application prospect.

The invention relates to a selenium-enriched health-care compound premixed feed for weaned piglets and a production method of the feed. 1% of the premixed feed by weight is added into a feed, the feed is suitable for piglets with the weight of 15-30kg, the demand of the piglets on selenium can be satisfied, and healthy growth of the piglets can be ensured. A selenium source used by the invention is nano selenium or yeast selenium. The nano selenium is nanoscale single element selenium which takes macromolecular substances (protein, saccharides and the like) as a dispersant, so that the feed has the characteristics of being small in grain size, large in superficial area, unstable and the like, is high in yeast selenium absorptivity and can be stored in animal bodies. Compared with other selenium sources (sodium selenite, amino acid chelated selenium and the like), the nano selenium or yeast selenium is relatively easily absorbed by the body, so that the feed is relatively high in bioavailability, safety, oxidation resistance and the like, and can be used for effectively improving the immune function of the weaned piglets.

The invention provides a preparation method for modified-graphene-containing tungsten carbide spraying powder of a self-lubricating and wear-resisting coating. The preparation method comprises steps as follows: 1), a certain quantity of modified graphite/tungsten carbide nano-composites are weighed and mixed with a certain amount of absolute ethyl alcohol, and after ultrasonic dispersion, a mixed solution of a graphite/tungsten carbide nano-composite is obtained; 2), a certain amount of tungsten carbide/cobalt spraying powder is weighed and added to the mixed solution of the graphite/tungsten carbide nano-composite; 3), tungsten carbide/cobalt spraying powder composited with modified graphene is obtained with a vacuum freeze drying method; 4), a tungsten carbide/cobalt self-lubricating and wear-resisting coating composited with modified graphene is prepared with a thermal spraying technology on the surface of a part after cleaning and sand blasting. According to the preparation method, characteristics of a laminated single-layer carbonaceous structure of graphene are reserved, a ratio of graphene is further increased by growing carbide nano-particles, and besides, with the adoption of the freeze drying method, loss of graphene due to ball milling or other powder mixing technologies can be avoided.

The invention relates to a high-low pressure airtight feeding sampler. The high-low pressure airtight feeding sampler is used for converting a high pressure water sample at a sampling site into a low steady voltage sample for storage and output. The high-low pressure airtight feeding sampler is applicable to laboratories and test cabinets of oil fields, environment monitoring, chemical industry, medicine, application or analytical chemistry relating to liquid.

The invention relates to the technical field of cosmetics and particularly relates to a formula of a fruit and vegetable facial mask with a skin moistening reinforcing effect. The facial mask essenceis prepared from the following raw materials: a fruit extract, a vegetable extract, moistening essential oil, essence, a whitening agent and a blending agent, wherein the moistening essential oil is mixture prepared by blending menthol, isopropyl-ketone, glycerinum and honey in a specific proportion; and the blending agent is mixture prepared by blending antioxidant, preservative, konjac glucomannan and methylene bisacrylamide in a specific proportion. According to the moistening facial mask prepared by the formula, natural nutritional ingredients in fruits and vegetables are sufficiently utilized to nourish and protect skin, and elements contained in different plants are adopted for beautifying faces of dry skin and sensitive skin. Compared with cosmetics of artificially synthesized compounds, the fruit and vegetable facial mask is safer and non-toxic.

The invention discloses a method for preparing piperidine type ionic liquid. The preparation method comprises the following steps of adding bromopropane into ethyl acetate, then adding N-methyl piperidine for a reaction for 8-48 h, eluting a solid phase with acetone, and performing rotary evaporation to obtain an intermediate product; dissolving the intermediate product in water, adding lithium trifluoromethanesulfonimide, washing an organic phase with water after extraction and liquid separation, and conducting rotary steaming and drying to obtain a final product. Meanwhile, the invention also discloses the piperidine type ionic liquid prepared by the method and application of the piperidine type ionic liquid as an electrolyte component of a lithium ion battery. The preparation method isimplemented at the normal temperature and has the advantages of being high in yield, economical and simple in operation. The piperidine type ionic liquid has the advantages of high purity, low water content, low viscosity, high conductivity and wide electrochemical window. The piperidine type ionic liquid prepared by the method is used as the electrolyte component to be applied to an electrolyte of the lithium ion battery and shows better inflammability and chemical stability and lower electrochemical impedance.

The invention relates to the field of biological technology, in particular to composition, a stabilizer, an application of the stabilizer, preservation and preparation methods of thrombin, a thrombin preparation and a kit. The composition and the stabilizer can guarantee that the enzyme activity of liquid thrombin is not lost under a room temperature condition in two years. Besides, the liquid thrombin prepared with the method can be used for preparing a thrombin hemostatic and manufacturing a kit for testing the content of FIB (fibrinogen), has wide and profound market prospect and can create considerable economic benefits and good social benefits.

The invention relates to a cannabidiol-rich hemp seed oil and a preparation method thereof. The method comprises the following steps: 1, decorticating: decorticating dried hemp seeds to obtain hemp seed kernels and shells; 2, crushing: crushing dried hemp leaves and hemp seed kernels to obtain a hemp material powder; 3, extracting: carrying out subcritical extraction on the hemp material powder toobtain an extract; 4, desolventizing: evaporating the extract under a reduced pressure to remove an extracting solvent to obtain an extract concentrate; and 5, centrifuging: centrifuging the extractconcentrate to obtain a supernatant which is the cannabidiol-rich hemp seed oil. The hemp leaves and hemp seeds are compounded to serve as extraction raw materials, and undergo a subcritical extraction technology to obtain the cannabidiol-rich hemp seed oil (the content of cannabidiol is 0.20-0.28%), and the method has a high oil yield of 80-95% and a high recovery rate of 25-28%.

The invention relates to a special compound premix feed for producing selenium-enriched pork and a production method of the special compound premix feed. 1 weight percent of the premix feed is added into a raw feed, the premix feed is suitable for 120-day-age growing-finishing pigs to pig in slaughter stage, the content of selenium of the produced pork is 0.25-0.29mg/kg, the requirements of the pigs on selenium can be met, and the healthy growth of the pigs is guaranteed. A used selenium source is nano-selenium or selenium yeast, the nano-selenium is nano-scale elemental selenium by taking macromolecular substances such as proteins and saccharides as dispersing agents and has the characteristics of small particle size, large superficial area, instability and the like, the selenium yeast is a high-quality organic selenium source, the nano-selenium or selenium yeast is more easily absorbed by the organism compared with other selenium sources such as sodium selenite and amino acid chelated selenium, and has the relatively high bioavailability, safety and oxidation resistance, the selenium-enriched pork belongs to functional healthy pork with a selenium supplement effect, the selenium contained in the selenium-enriched pork is the organic selenium which is easily absorbed and utilized by the human body, and the selenium-enriched pork is an excellent selenium supplement food.

The invention relates to a preparation method of a freeze-dried liposome containing a hair-growing composition. The preparation method is characterized by comprising the following steps: A, weighing amentoflavone, quercetin-3-o rutinoside, tetramethylpyrazine and ricinoleic acid according to a mass ratio of 1: (1-3): (0.5-2): (3-5) to form the hair-growing composition, and weighing hyaluronic acidoligosaccharide and scleroglucan according to a mass ratio of 1: (0.2-0.5) to form a freeze-drying protective agent; B, dissolving the hair-growing composition, cholesterol and hydrogenated lecithinin ethanol, performing ultrasonic treatment, and performing reduced-pressure rotary evaporation to remove ethanol to obtain a lipid membrane containing the hair-growing composition; C, adding an isotonic phosphate buffer solution into the lipid membrane, and performing ultrasonic treatment and filtration to obtain a liposome suspension; and D, adding the freeze-drying protective agent into the liposome suspension, and performing vacuum freezing at the temperature of minus 50 DEG C to minus 10 DEG C for 36-72 hours to obtain the freeze-dried liposome containing the hair-growing composition. Thefreeze-dried liposome containing the hair-growing composition has the advantages of uniform particle size, high stability, convenience in use and good hair-growing effect.