1596 results about "Phenolic content in tea" patented technology

The invention provides a personalized functional nutritional tea point rich in tea polyphenol and resveratrol and a 3D printing manufacturing method. The personalized functional nutritional tea point comprises a shell and an inner core, wherein the shell and the inner core are respectively a shell gel material and an inner core gel material; the inner core gel material comprises a water-oil double-gel material rich in tea polyphenol and resveratrol; wherein the water-oil double-gel material is prepared by the following steps: adding chitosan, betaine and vanillin into a mixed solution of corn starch, chickpea protein and water, heating and incubating to obtain hydrogel; and dissolving the tea polyphenol in the hydrogel to obtain the tea polyphenol hydrogel. The oleogel is obtained by melting and mixing beeswax and linseed oil, and then dissolving resveratrol in the oleogel; the personalized functional nutritional tea point is high in content of active ingredients of tea polyphenol and resveratrol and has heat stability, illumination stability and storage stability; the 3D coaxial printing technology is utilized, the functional components are further stabilized, tea points of various patterns and shapes can be obtained, and the method has personalized food preparation and application value.

The invention relates to the technical field of water treatment, and discloses a modified polyaluminum chloride flocculant and a preparation method thereof.The modified polyaluminum chloride flocculant is prepared from, by weight, 50-65 parts of polyaluminum chloride, 8-12 parts of magnesium silicate, 5-8 parts of carboxymethyl chitosan, 15-25 parts of polyaluminum ferric chloride and 3-5 parts of tea polyphenol; the molar ratio of aluminum ions to iron ions in the modified polyaluminum chloride flocculant is (3-4.5): 1. According to the invention, an inorganic-organic dual-modifier synergistic effect mechanism is adopted to construct a'rigid framework-flexible network 'composite structure, and the structure can significantly improve the adsorption capacity of Pb < 2 + >. Meanwhile, the mechanical property of the flocculating agent is improved, so that the flocculating agent can be applied to a high-turbulence environment.

The invention belongs to the technical field of biochemical engineering, and discloses application and a method of tea polyphenol in improvement of schizochytrium limacinum DHA (docosahexaenoic acid) grease yield and grease storage, and tea polyphenol is added in the process of producing DHA by fermentation of schizochytrium limacinum. By comparing the difference of schizochytrium limacinum in tea polyphenol fermentation and traditional fermentation, it is clear that the antioxidant tea polyphenol regulates cell oxidative stress in schizochytrium limacinum, removes ROS and inhibits grease oxidation, so that grease rancidity is delayed, and grease synthesis and DHA production are increased. According to the invention, schizochytrium limacinum HX-308 is used as a receptor strain, and an antioxidant tea polyphenol is added for regulation, so that fermentation conditions under which the content of grease and DHA is obviously increased and the grease storage effect is better are obtained.

The invention belongs to the technical field of water treatment, and discloses a green and environment-friendly pH-responsive corrosion inhibitor as well as a preparation method and application thereof. The corrosion inhibitor comprises the following raw materials in parts by mass: 25-30 parts of green tea polyphenol, 10-15 parts of graphene oxide nanosheets, 15-25 parts of pH response type polymer corrosion inhibition microcapsules, 5-10 parts of a beta-cyclodextrin / corrosion inhibition salt inclusion compound, 5-10 parts of an amino acid derivative polymer, 3-5 parts of a thickening agent, 180-450 parts of a solvent, and an antioxidant accounting for 0.01-0.05% of the total mass of the raw materials. And a pH regulator is added to regulate the pH of the corrosion inhibitor to 7-8. According to the corrosion inhibitor, plant extracts and non-toxic chemical substances are adopted as main components, the requirements of environment-friendly materials are met, and under the synergistic effect of all the components, the corrosion inhibitor can keep stable in a high-temperature, oxygen-containing and high-salinity environment, and anti-corrosion protection can be provided for a long time.

The invention discloses a metal-doped carbon quantum dot as well as preparation and application of the metal-doped carbon quantum dot in a nano antibacterial agent, citric acid, urea and tea polyphenol are taken as precursors, metal salt is added, carbon dot synthesis and metal ion doping are synchronously completed in one step through a hydrothermal method, and the metal-doped carbon quantum dot is prepared; the surfaces of the metal-doped carbon quantum dots are negatively charged, and the metal-doped carbon quantum dots have peroxidase-like activity and catalase-like activity at the same time; the metal ions adopt any one of Fe < 3 + >, Cu < 2 + > and Ce < 3 + >; the metal-doped carbon quantum dots are in a sphere-like shape. The metal-doped carbon quantum dots prepared by the preparation method disclosed by the invention have peroxidase-like activity and catalase-like activity at the same time through precise doping of metal ions, and the two activities have a synergistic effect in an oral periodontitis microenvironment, so that a good antibacterial effect is achieved.

The invention relates to the field of skin care and medical cosmetology, and discloses a long-acting moisturizing and barrier repairing type exosome active gel and a preparation method thereof, and the gel comprises the following components by mass: 2-5 parts of exosome; 3 to 7 parts of trehalose; 2 to 6 parts of glycerol; 1 to 2 parts of polyvinyl acrylate; 0.5 to 1.5 parts of octyl glucoside; 0.8 to 1.5 parts of sodium hyaluronate; 0.2 to 0.5 part of low molecular peptide; 1 to 3 parts of polyacrylamide; and 0.02 to 0.05 part of a tea polyphenol antioxidant. According to the invention, through synergistic repair of the exosome and the low-molecular peptide, dual moisturizing of the trehalose and the glycerol, a thickening system is innovated to improve the stability, and the tea polyphenol antioxidant is combined, so that deep repair, lasting moisturizing, skin feeling optimization and aging resistance are effectively realized, and multiple bottleneck problems of a traditional skin care technology are comprehensively solved.

The invention provides a hydrogel composition. The hydrogel composition is prepared from the following components in percentage by weight: 0.5 to 15 percent of an adhesion component, 0.5 to 10 percent of a moisturizing component, 0.01 to 5 percent of a bioactive component, 0.01 to 5 percent of a physical crosslinking agent, 0.01 to 2 percent of a flavoring component, 0.01 to 2 percent of an antimicrobial component and the balance of medical purified water, wherein the bioactive component comprises at least one of lipoic acid, tea polyphenol, lactic acid bacteria extract and metabiotics; the antimicrobial component comprises at least one of copper ions, benzyl alcohol, p-hydroxyacetophenone, sodium methyl hydroxybenzoate and sodium ethyl hydroxybenzoate. According to the hydrogel composition disclosed by the invention, the low-concentration antimicrobial component is introduced, so that the antimicrobial component has more stable and effective bactericidal activity and can be more stably adhered to a wound, and the hydrogel composition can have better antibacterial performance and a function of promoting wound healing without additionally adding antibiotics.

The invention relates to the technical field of microbial genetic engineering, in particular to a method for improving cordycepin synthesized by saccharomyces cerevisiae and saccharomyces cerevisiae engineering bacteria. According to the invention, codon-optimized 2 '-carbonyl-3'-deoxyadenosine reductase gene and 3 '-adenosine monophosphate phosphohydrolase gene from cordyceps militaris are expressed by using plasmids, and then the plasmids are transformed into host cells to obtain the saccharomyces cerevisiae engineering bacteria. And inoculating a seed solution obtained by seed culture of the activated saccharomyces cerevisiae engineering bacteria into a fermentation culture medium containing a metabolic effector, and carrying out fermentation culture to synthesize cordycepin. Metabolic effectors (Cu < 2 + >, Fe < 2 + >, Mg < 2 + >, Zn < 2 + >, citric acid, cysteine, aspartic acid, glycine, VB1 and tea polyphenol) are added into a fermentation culture medium strain, and the variety and concentration of the metabolic effectors are optimized, so that the yield and synthesis efficiency of cordycepin are remarkably improved. By using the combination of the strain obtained by the invention and the optimal effector, the yield of cordycepin in a fermentation tank reaches 2.9 g / L.

The invention discloses tea polyphenol component detection equipment for jasmine tea and a detection method thereof. The tea polyphenol component detection equipment comprises a spectrophotometer host, and the lower end of the spectrophotometer host is fixedly connected with a bottom support bin. Through the arrangement of the grinding box and the crushing knife rest, in the use process, jasmine tea needing to be detected is placed in the grinding box, then the pressing frame is assembled, through the pressing frame and second filter cloth, the movable space of the jasmine tea is limited, the jasmine tea is made to be close to the crushing knife rest, and therefore the crushing speed is increased; a solvent is placed in the grinding box, separation of tea polyphenol is accelerated through rotation of the crushing knife rest, meanwhile, sufficient extraction of the tea polyphenol can be guaranteed, the solution is directly filtered through the second filter cloth, the solution is taken out through the suction pipe and placed in the cuvette, then the cuvette is placed in the sample chamber, detection can be conducted, overall use is simple, and the detection efficiency is high. The device can directly measure on site, integrates components required by detection into a whole, and is convenient to carry.

The invention discloses low-sugar konjak fruit granule jelly and a preparation method thereof, and belongs to the technical field of low-sugar konjak jelly, and the low-sugar konjak fruit granule jelly comprises the following components in parts by weight: 5-10 parts of konjak powder, 1-2 parts of xanthan gum, 12-15 parts of yacon syrup, 0.1-0.2 part of an emulsifier, 1-3 parts of tea polyphenol, 3-8 parts of fruit granules, and the balance of water. The preparation method is used for solving the problems of low sugar, uneven fruit particle distribution and inoxidizability of the konjak fruit particle jelly, and the prepared konjak fruit particle jelly is a healthy and delicious jelly product with additional nutritional value.

The invention relates to the technical field of fibers, and discloses a preparation method of antibacterial modified fibers for textile fabrics, nylon 6 and copper-tea polyphenol-based hyperbranched polyamide are added into formic acid, the mixture is stirred and then spun by an electrostatic spinning machine, and the antibacterial modified fibers for the textile fabrics are obtained. The hyperbranched polyamide has good compatibility with nylon 6, contains a three-dimensional dendritic hyperbranched molecular chain, has a good toughening effect on nylon 6 fibers, and enables the fibers to maintain good breaking strength while improving the elongation at break of the fibers. The copper-tea polyphenol-based hyperbranched polyamide contains tea polyphenol active antibacterial substances and antibacterial copper ions, so that the antibacterial performance of the fiber is remarkably improved. Meanwhile, the copper ions, the tea polyphenol and the catechol-based hyperbranched polyamide form a tight and firm coordination effect, and the copper ions and the tea polyphenol are also difficult to elute from a fiber matrix, so that the fiber still keeps excellent antibacterial performance.

The invention relates to the field of tea fermentation, in particular to a preparation method and application of black tea fermentation liquor with an anti-aging effect. The black tea fermentation liquor rich in tea polyphenol, thearubigins, theaflavins and theabrownin is prepared by jointly fermenting black tea with pichia kudriavzevii and bacilli. The black tea fermentation liquor has the functions of regulating cell metabolism and functions, repairing oxidative damage of cells, keeping completeness of mitochondrial functions, promoting synthesis of a high-energy phosphate compound ATP, enhancing cell activity and resisting aging, and can be applied to food, cosmetics and health care products. The fermentation process provided by the invention is green, safe and simple, and has practical application significance.

The invention discloses a production process of a modified p-phenylenediamine rubber anti-aging agent, which comprises the following steps: S1, catalyzing a ring-closure reaction through lipase, and accurately controlling pH by combining a phosphate buffer solution, so that the bonding efficiency of 6PPD and tea polyphenol is remarkably improved, and the release amount of aniline is effectively reduced; s2, carrying out spray drying to obtain EP-TP powder to control the particle morphology; s3, increasing the load rate of the anti-aging agent and effectively inhibiting the migration rate of the anti-aging agent through the pore diameter physical confinement of mesoporous silica and an amination gas phase modification technology, and ensuring uniform dispersion of anti-aging agent particles through the synergistic effect of staged load reaction and a polyethylene glycol dispersant; and S4, the particle morphology is cooperatively controlled through vacuum microwave drying, the dispersion requirement of the rubber mixing technology is met, and the interface bonding strength is improved by combining the staged loading reaction with a polyethylene glycol dispersing agent.

The invention discloses a starch-based full-biodegradable mulching film capable of being rapidly degraded and a preparation method of the starch-based full-biodegradable mulching film, and belongs to the technical field of degradable materials.The preparation method comprises the steps of tea polyphenol calcium salt preparation, filler preparation, thermal plasticization and film preparation. The preparation of the filler comprises the following steps: adding silicon dioxide into a polyacrylic acid aqueous solution, stirring and centrifuging at room temperature, taking a precipitate, adding the precipitate into a polyvinylpyrrolidone aqueous solution, adjusting the pH value to 3-3.5, stirring and centrifuging at room temperature, taking the precipitate, adding the precipitate into the polyacrylic acid aqueous solution, adjusting the pH value to 3-3.5, stirring and centrifuging at room temperature, taking the precipitate, and freeze-drying to obtain the filler. The starch-based full-biodegradable mulching film prepared by the preparation method disclosed by the invention is good in processability, waterproofness and heat resistance and high in mechanical strength, the problem of phase separation does not occur in preparation, the problem of plasticizer precipitation does not easily occur in long-term use, and rapid degradation can be realized.

The invention relates to a herbal deodorizing master batch, a fiber, a fabric and a preparation method thereof. The master batch comprises the following components in parts by mass: 60-75 parts of polyester PET, 0.5-1 part of an antioxidant, 0.5-1 part of a dispersant and 25-40 parts of a herbal deodorizing extract, the herbal deodorizing extract comprises one or more of scandent hop extract, mottled bamboo extract, lichen extract and amblystegium giganteum extract; the antioxidant is tea polyphenol, and the dispersing agent is talcum powder. The master batch is prepared by melt blending extrusion granulation, and the fiber is prepared by melt spinning of the master batch and polyester. The deodorization component in the master batch prepared by the invention can still keep activity after being subjected to polymer melting high-temperature treatment, and can enter the fabric in a melt spinning manner, so that the fabric has deodorization property.

The present invention belongs to the technical field of fiber materials, and relates to a composite fiber containing nano natural tea fibers, and a preparation method and application thereof. The raw materials for preparing the composite fiber include nano natural tea fibers and basic fiber pulp, and the nano natural tea fibers are mate nano fiber microemulsions. The present invention integrates nanotechnology into the preparation of natural tea fibers, and adopts a microemulsion method to simultaneously and evenly disperse a variety of effective ingredients in tea in the mate nano fiber microemulsion, so that the multifunctionality of the fabric can be effectively exerted; the microemulsion system has high uniformity and long-term stability, and during the spinning process, the nano tea fibers can be highly dispersed in the spinning solution without the need for additional surfactants, and the effect of the functional fabric finally obtained can be long-lasting. In addition, mate tea is rich in tea polyphenols and unique yerba mate alkaloids, which can further improve the comprehensive performance of the composite fiber.

The application discloses an Aspergillus niger strain and a culture method and application thereof, the Aspergillus niger strain is preserved in China Center for Type Culture Collection, and the preservation number is CCTCC NO: M 20241727. The fermented tea product obtained by fermenting tea leaves or tea leaf extracts by using the Aspergillus niger strain CCTCC NO: M 20241727 has prominent sweet and floral fragrance, and the astringency is obviously reduced; the contents of tea polyphenols, free amino acids and flavones are higher than those of a fermented tea product of an existing Aspergillus niger strain; the antioxidant activity is enhanced; the tea soup color is orange red and bright; and the color, fragrance and taste qualities are all superior to those of the fermented tea product of the existing Aspergillus niger strain.

The invention discloses a functional probiotic composition and application thereof, and relates to the technical field of microbial engineering. Bifidobacterium longum, lactobacillus acidophilus and enterococcus faecalis are combined to serve as a microbial agent, the microbial agent and active substances of the tea leaves form a composition, then the composition is combined with prebiotics, it is ensured that viable bacteria directly reach the intestinal tract through a microencapsulation technology, and the effect of improving the immune function is achieved; tea polyphenol in the active substances of the tea leaves can serve as a carbon source of prebiotics to stimulate proliferation of the bifidobacterium longum and the lactobacillus acidophilus, so that the acid resistance and intestinal colonization capacity of the microbial inoculum are enhanced, and meanwhile, theanine in the active substances of the tea leaves, the bifidobacterium longum and the lactobacillus acidophilus synergistically promote secretion of gamma-aminobutyric acid, so that the effect of improving the intestinal colonization is achieved. And the tea polyphenol can inhibit the large intestine rod from adhering to the intestinal mucosa, and the probiotic agent secretes antibacterial peptide, so that the integrity of the intestinal barrier is maintained together.

The invention discloses a stainless steel material for a food-grade straw and a preparation process of the stainless steel material, and relates to the technical field of stainless steel material plating. The silver coating and the antibacterial coating are arranged on the surface of the stainless steel material, and the stainless steel material has good wear resistance and antibacterial performance through the action of the double protective layers. Sulfonated polyphenylene sulfide is added into a silver plating solution, a plating layer is formed after electroplating, the surface of a stainless steel material is not prone to being scratched, the wear resistance of stainless steel is improved, quaternary ammonium salt modified tea polyphenol-nano-silver composite particles are added into the antibacterial coating, and through the synergistic antibacterial effect of quaternary ammonium salt, tea polyphenol and nano-silver, the wear resistance of the stainless steel material is improved. The broad-spectrum antibacterial property is realized, and the efficient antibacterial effect is achieved.

The invention provides a method for efficiently extracting tea polyphenol and tea polysaccharide and application, and belongs to the technical field of plant extraction.The extraction method comprises the following steps that tea leaves are pre-cooled and rolled and cut to obtain pretreated tea leaves, then the pretreated tea leaves are added into water to be mixed, biological enzyme is added for ultrasonic enzymolysis, filtering is conducted, and filtrate and tea residues are obtained; adding tea residues into water, mixing, adding an auxiliary agent, and carrying out low-temperature plasma treatment and filtration to obtain a filtrate; combining the filtrates, concentrating, precipitating, centrifuging, and collecting precipitate and supernate; washing and drying the precipitate to obtain a tea polysaccharide extract; and concentrating, extracting, adsorbing, eluting, re-concentrating and drying the supernate to obtain the tea polyphenol extract. The extraction method disclosed by the invention can be used for efficiently extracting the tea polyphenol and the tea polysaccharide in the tea leaves, the product yield and purity are high, and the tea polyphenol and the tea polysaccharide can be used for preparing health-care products for relieving diabetes and polyuria.

The invention belongs to the field of food processing, and particularly relates to an ostrich meat preservative and a preservation method. The ostrich meat preservative provided by the invention is prepared by matching and mixing the chitosan, the nisin and the tea polyphenol according to a specific proportion, so that the refrigeration refreshing time of the ostrich meat treated by the preservative can be effectively prolonged, the ostrich meat can maintain a relatively high L * value and a * value within 16 days of storage, the deterioration of meat color is delayed, the water-retaining property is remarkably improved, and the quality of the ostrich meat is improved. The content of thiobarbituric acid reactants and volatile basic nitrogen is obviously reduced, and fat oxidation and protein degradation are inhibited; the total number of bacterial colonies and the number of microorganisms such as coliform bacteria, pseudomonas, mould and saccharomycetes are obviously reduced. The growth and reproduction of putrefying bacteria can be effectively inhibited, and the cold fresh shelf life is prolonged.

The invention provides a fresh-keeping composite solution sprayed before picking fruits in cold-chain logistics transportation and a preparation method of the fresh-keeping composite solution, and relates to the field of fruit fresh keeping. The fresh-keeping composite solution is prepared from the following raw materials in parts by weight: 2.8 to 3.5 parts of schizochytrium limacinum powder, 2.3 to 2.8 parts of salvia officinalis extract, 1.8 to 2.2 parts of brown algae extract, 1.2 to 1.8 parts of banana peel polysaccharide, 0.8 to 1.2 parts of sodium carboxymethyl cellulose, 0.8 to 1.2 parts of tea polyphenol, 0.8 to 1.2 parts of beta-cyclodextrin, 0.8 to 1.2 parts of sodium alginate, 0.8 to 1.2 parts of calcium chloride, 0.4 to 0.6 part of olive oil, 0.1 to 1 part of malic acid and 80 to 90 parts of water. The composite fresh-keeping solution is developed for cold-chain logistics transportation of fruits and is applied before fruit picking, the synergistic effect of multiple natural components is utilized, sterilization and oxidation resistance can be achieved, the growth of microorganisms can be effectively inhibited, the respiration rate of the fruits is reduced, the moisture of the fruits is kept, and the optimal fresh-keeping effect is achieved. The fruit preservative is sprayed before the fruits are picked, so that decay and quality reduction of the fruits in the cold-chain logistics transportation process can be effectively reduced.

The invention discloses a method and a system for determining the content of tea polyphenol in tea leaves, and relates to the technical field of chemical component analysis of tea leaves, and the method comprises the following steps: dissolving tea polyphenol in a tea leaf sample into a primary extract A through dynamic ultrasonic-assisted enzymolysis and hot water extraction; filtering the primary extract A to remove insoluble impurities so as to obtain a tea polyphenol extract B containing tea polyphenol and a small amount of soluble impurities; performing multi-stage solvent separation on the tea polyphenol extracting solution B by using ethanol, ethyl acetate and dilute acid, adding a multi-metal ion complexing solution, removing water-soluble impurities through complexing reaction, and concentrating to obtain a high-purity tea polyphenol solution D; diluting the tea polyphenol solution D as an optical analysis sample; determining the absorbance of the diluted optical analysis sample, and calculating the concentration of tea polyphenol in the diluted sample; and calculating the final content of the tea polyphenol in the tea leaves according to the concentration of the tea polyphenol in the diluted sample in combination with an optical analysis sample dilution ratio and an extraction volume.

The invention relates to the field of oral cavities, and particularly discloses a lasting antibacterial type composite tooth socket for medicine carrying and a preparation method thereof.The lasting antibacterial type composite tooth socket comprises an adsorption layer and an antibacterial membrane layer, the adsorption layer is used for adsorbing oral cavity treatment liquid medicine, and the antibacterial membrane layer comprises a nano-silver antibacterial layer and a chitosan antibacterial layer; the preparation method comprises the following steps: mixing a tea polyphenol-polylactic acid composite solution, a nano-silver-carboxylation modified cellulose compound and a polyvinyl alcohol solution, and carrying out electrostatic spinning to prepare a nano-silver antibacterial fiber membrane, so as to form the nano-silver antibacterial layer; mixing chitosan with hot water, adding cinnamyl aldehyde, glycerol and boric acid, stirring to obtain a mixed solution, coating one side of the nano-silver antibacterial layer with the mixed solution, and curing to form a chitosan antibacterial layer; the adsorption layer is attached to the side, away from the chitosan antibacterial layer, of the nano-silver antibacterial layer, and then the lasting antibacterial type composite tooth socket for carrying the medicine is prepared through hot-pressing compounding. The drug-loaded composite tooth socket has the characteristic of further improving the antibacterial property and the antibacterial durability of the drug-loaded composite tooth socket.

The invention discloses a preparation technology of directional debitterizing yellow tea, and belongs to the technical field of tea processing. Fresh tea leaves are used as raw materials, the yellow tea is prepared through the processes of pretreatment, fermentation, fixation, rolling, heaping for yellowing and drying, during fermentation, a compound bacteria solution and the spread and aired fresh leaves are mixed and fermented, strains in the compound bacteria solution comprise lactic acid bacteria, saccharomycetes and bacillus, and through the synergistic effect of the lactic acid bacteria, the saccharomycetes and the bacillus, the yellow tea is prepared. Balancing of directional degradation of bitter and astringent substances and generation of flavor substances is achieved, high-quality yellow tea is prepared through efficient debitterizing, the stage heaping yellowing technology is adopted, primary heaping and secondary heaping are adopted for two-stage heaping yellowing, the quality of the yellow tea is enhanced, and poor taste caused by excessive heaping yellowing is avoided. According to the finished tea prepared by the preparation process, the content of tea polyphenol is reduced to 18%-20% through detection, the content of amino acid reaches 4.5%-5.0%, bitter taste and astringent taste are relieved, sweet taste is added, and the taste is mellow.

The invention discloses a high-oxidation-resistance long-life polyethylene cable sheath material and a preparation method thereof, and relates to the technical field of high polymer materials. Comprising the following components: high-molecular-weight high-density polyethylene, surface-modified nano-dioxide, furan-maleimide grafted polyethylene, a Schiff base dynamic cross-linking agent, tea polyphenol grafted polyethylene, a temperature-responsive oxygen-blocking microcapsule, a main antioxidant, an auxiliary antioxidant, an emergency antioxidant, a light stabilizer, a halogen-free flame retardant, a processing aid and an acid absorbent. According to the invention, the main antioxidant, the auxiliary antioxidant and the tea polyphenol grafted polyethylene form a chemically synthesized and naturally modified composite antioxidant system, the designed service life of the material is greatly prolonged, the temperature-responsive oxygen-blocking microcapsule automatically cracks to release the core material when the operating temperature of the cable is greater than or equal to 90 DEG C, a dynamic oxygen-blocking layer is formed, and the service life of the cable is prolonged. The defect that the effect of traditional physical oxygen barrier is attenuated at high temperature is overcome, and the oxygen permeability at high temperature is reduced compared with that of a single nano barrier scheme.

The invention belongs to the field of food fermentation, and particularly discloses a fermentation process of pickled vegetables in old jars, which comprises the following steps: selecting fresh vegetables, carrying out irradiation sterilization pretreatment, carrying out primary micro-aerobic fermentation by using a compound bacteria solution containing specific microorganisms, and carrying out secondary anaerobic fermentation by using a steeping liquor with a specific ratio. In the process, the vegetables are diversified, the compound bacteria liquid is rich in various beneficial microorganisms such as halophilic archaea, lactic acid bacteria and yeast, the steeping liquor 1 and the steeping liquor 2 respectively optimize the fermentation environment and are rich in nutritional ingredients and flavor substances such as lactic acid bacteria exopolysaccharides, tea polyphenols and selenium-enriched yeast powder, and the taste and fragrance of the pickled vegetables are improved. Besides, according to the process, by accurately controlling the fermentation temperature, humidity and time, the fermentation period is remarkably shortened, meanwhile, the use of chemical additives is avoided, and the safety and health of the pickled vegetables are guaranteed; the prepared pickled vegetables in old jars are delicious in taste, rich in fragrance, short in fermentation time and free of chemical additives, and the requirements of consumers for high-quality and healthy foods are met.

Compared with the prior art, the application of the copper-based nano-enzyme to the dual-mode detection of the antioxidant capacity of the tea polyphenol has the beneficial effects that the provided copper-based nano-enzyme is simple to prepare, and an EGCG (epigallocatechin gallate) dual-mode detection method based on the copper-based nano-enzyme is simple, convenient, efficient and high in sensitivity; the method has important application value in the aspect of detecting the equivalent weight of EGCG in the tea leaves and further evaluating the natural antioxidant capacity of the EGCG.

The invention provides a fat-reducing composition based on an agaricus bisporus extract as well as a preparation method and application of the fat-reducing composition, and belongs to the technical field of nutrition and health care. The fat-reducing composition comprises the following raw materials in parts by weight: 10-30 parts of an agaricus bisporus extract, 5-15 parts of a green tea extract, 5-15 parts of bitter gourd peptide, 3-10 parts of seaweed meal and 10-30 parts of resistant dextrin. The agaricus bisporus extract disclosed by the invention can regulate intestinal flora and promote fat metabolism; tea polyphenol in the green tea extract can inhibit fat synthesis and promote fat oxidation; momordica charantia peptide has an obvious hypoglycemic effect; the seaweed meal (containing fucoxanthin) has the effects of burning fat cells and eliminating fat accumulation; the resistant dextrin is used as dietary fiber, so that satiety is increased, and caloric intake is reduced. The raw materials cooperate with each other, so that the composition has better fat-reducing and weight-reducing effects, and the total cholesterol and triglyceride levels are reduced.

The invention relates to the technical field of pharmaceutical preparations, in particular to a preparation process of carbon dots for killing helicobacter pylori and application of the carbon dots in oral pharmaceutical preparations. The preparation method comprises the following steps: mixing microcrystalline cellulose and glycerol, freezing and crushing at an ultralow temperature, and selectively hydrolyzing by combining citric acid-malic acid mixed acid liquor to efficiently prepare a high-crystallinity cellulose nanocrystal template; the controllable synthesis of the carbon dots is realized by utilizing the hydrogen-bond interaction of hydroxyl / carboxyl on the surface of the cellulose nanocrystal and the nitrogen doping effect in the polymerization and carbonization process of citric acid and urea. Besides, when a sodium alginate-chitosan double-layer structure is constructed, carbon dots are introduced into the inner layer to endow the inner layer with special performance, a protein-polysaccharide network is formed on the outer layer through transglutaminase enzymatic crosslinking, and the oxidation resistance and mechanical strength are enhanced through secondary curing of tea polyphenol. According to the invention, food-grade raw materials are used for realizing high-efficiency antibiosis, the oral preparation safety specification is met, and the clinical transformation potential is realized.