371results about How to "Improves antioxidant activity" patented technology

The invention discloses a method for removing volatile fishy smell components in linseed oil, and relates to the technical field of linseed oil preparation. The method specifically comprises the following steps: carrying out degumming pretreatment on flaxseeds, carrying out ultrasonic treatment, then carrying out supercritical extraction to obtain crude refined flaxseed oil, adding a deacidification agent, and carrying out water bath stirring centrifugation to obtain deacidified flaxseed oil; adding a composite adsorbent, stirring and centrifuging to obtain decolorized linseed oil; adding green tea polyphenol, continuously stirring and centrifuging, finally adding a flavor stabilizer, and uniformly stirring to obtain the refined linseed oil without volatile fishy smell. Wherein the green tea polyphenol and the composite adsorbent have a synergistic effect, so that a good deodorization effect is brought to the linseed oil.

The invention discloses lactobacillus fermentum with a hypoglycemic function and application of the lactobacillus fermentum. According to the invention, lactobacillus fermentum with high hypoglycemic ability is screened from Yunnan Baoshan freshly brewed yoghurt samples, the strain is preserved in China Center for Type Culture Collection, and the preservation number is CCTCC NO: M 20241504. In the fermentation process of the strain, alpha-glucosidase and alpha-amylase can be inhibited, and the inhibition rates are 43.91% and 59.44% respectively. The bacterial colony morphology of the lactobacillus fermentum E003 is milky white, semitransparent, relatively moist and smooth, the edge is neat, and obvious bulges are formed. When being used for preparing the anti-sugar fermented milk, the fermented milk can also inhibit alpha-glucosidase and alpha-amylase, and meanwhile, the fermented milk also has various characteristic nutritional ingredients; the lactobacillus fermentum E003 fermentation liquor also has relatively strong bacteriostatic ability, antioxidant activity and GABA high-yield ability.

The invention discloses a preparation method of a multifunctional polyvinyl composite film and application of the multifunctional polyvinyl composite film in food preservation. The preparation method comprises the following steps: firstly, preparing Ag-coated MOF through a hydrothermal method, then uniformly dispersing the Ag-coated MOF and tannic acid into a carboxymethyl chitosan solution, and carrying out crosslinking modification on the Ag-coated MOF; and coating the prepared CMCS / TA / Ag (at) MOF mixed solution on a polyethylene film treated by oxygen plasma, and drying to form a film, so as to obtain the multifunctional polyethylene-based composite film. The CMCS and the TA are adopted to perform crosslinking modification on the Ag-coated MOF, so that the stability of the Ag-coated MOF can be further improved, and the release of silver ions is reduced. Compared with a common PE preservative film, the composite film prepared on the basis has better barrier capacity and mechanical property, and has antibacterial, anti-ultraviolet and anti-oxidation effects. The multifunctional preservative film is convenient to use and low in price, and has an important application prospect in the aspect of fresh-keeping packaging of meat products.

The invention relates to nutrient-rich red yeast rice bran and a preparation method thereof.The preparation method comprises the following steps that after rice bran is subjected to enzyme deactivation and sterilization treatment, the moisture is controlled to be 20%-30%; adding a composite enzymatic hydrolysate into the pretreated rice bran, uniformly stirring, and performing enzymolysis to obtain a semi-solid base material; the temperature of the semi-solid base material is controlled to be 36-40 DEG C, and the pH value is adjusted to be 5.0-5.5; inoculating monascus for culturing, turning over the yeast once every 10-12 hours, and culturing for 5-6 days to obtain a yeast material; spreading and culturing the koji material, and controlling the temperature of the koji material to be 30-35 DEG C; after the culture is completed, drying the yeast material until the moisture is below 10% to obtain the nutrient-rich red yeast rice bran; the monascus rice bran with high content of monacolin K can be obtained through the method, the technological operation is simple, the labor intensity of workers is reduced, the production period is short, and the method is suitable for large-scale application and has remarkable economic benefits and social benefits.

The invention discloses an endophytic fungus, which is preserved in the China General Microbiological Culture Collection Center (CGMCC), and the preservation number is CGMCC No.41218. The endophytic fungus has the advantages that the endophytic fungus can be used for preparing a culture medium; the endophytic fungus strain PG-2 can increase the antioxidant enzyme activity of monocotyledons (high wheatgrass and triticale) and dicotyledons (green vegetables and calcium vegetables), promote the accumulation of permeability regulating substances and reduce the content of malondialdehyde in the body. The PG-2 is a drought-resistant strain which has oxidation resistance and drought resistance and can promote plant growth, and has huge development potential in agricultural production.

The invention provides a biodegradable food preservative film as well as a preparation method and application thereof. The preservative film is a chitosan and polyvinyl alcohol composite film loaded with cinnamon oil microcapsules. The preparation method mainly comprises microcapsule preparation and film preparation. Wherein the microcapsule preparation comprises the following steps: dissolving beta-cyclodextrin, adding cassia oil, and stirring the mixture to form a microcapsule emulsion. And storing the emulsion in a refrigerator overnight. And on the second day, filtering the solution to collect a precipitate, washing and drying to obtain the microcapsule. The film preparation comprises the step of mixing a polyvinyl alcohol solution, a chitosan solution and glycerol according to a fixed proportion. Then, adding cassia oil microcapsules, and uniformly stirring to obtain a film-forming solution; and pouring the film forming liquid into a mold flat plate to prepare a film, thereby obtaining the antibacterial composite film. The tear strength of the prepared film is 21.18 N / mm < 2 > to 43.21 N / mm < 2 >, the elongation at break is 82.60% to 147.56%, and the antioxidant activity is 27.47% to 36.87%; the preservative has an obvious inhibiting effect on staphylococcus aureus and escherichia coli, and can effectively prolong the shelf life of fresh-cut fruits.

The invention provides a preparation method of dendrobium huoshanense polysaccharide, which comprises the following steps: firstly, pretreating dendrobium huoshanense through steam explosion, then extracting water-soluble polysaccharide by using a hot water extraction method, then separating out the polysaccharide by using a low-temperature alcohol precipitation method, removing protein and pigment by using a Sevag method and a macroporous resin adsorption method, and then separating out the dendrobium huoshanense polysaccharide. Dialyzing the polysaccharide solution through a regenerated cellulose dialysis bag to remove substances with the molecular weight less than 2000Da, finally freeze-drying to obtain a dendrobium polysaccharide crude product, and further separating and purifying to obtain the refined dendrobium polysaccharide. In-vitro experiments show that the refined dendrobium polysaccharide has remarkable antioxidant activity and antitumor activity, and has a better application prospect in the fields of skin care and medicines.

The invention belongs to the field of fermentation, and particularly relates to kluyveromyces marxianus, a complex microbial inoculant, fermented tea primary pulp as well as a preparation method and application of the kluyveromyces marxianus. Wherein the Kluyveromyces marxianus is Kluyveromyces marxianus Linzhi.KM-D3, the Kluyveromyces marxianus Linzhi.KM-D3 is preserved in the China Center for Type Culture Collection (CCTCC), and the preservation number of the Kluyveromyces marxianus Linzhi.KM-D3 is CCTCC NO: M 20231575. The DPPH free radical scavenging capacity of the fermented tea raw stock obtained through fermentation of the kluyveromyces marxianus is larger than or equal to 140%, the hydroxyl free radical scavenging capacity is larger than 130%, the ABTS free radical scavenging capacity is larger than 80%, and the SOD enzyme activity of each L of the fermented tea raw stock is larger than 1300U. Meanwhile, the pH value of the fermented tea puree provided by the invention is less than or equal to 4.0, the total acid content (in terms of lactic acid) is greater than or equal to 6g / 100g, the ethanol content is less than or equal to 0.5 g / 100g, the sucrose content is less than or equal to 0.5 g / 100g, and the fermented tea puree has no fermentation peculiar smell and light bitter taste in the aspect of sensory evaluation.

The invention belongs to the technical field of microorganisms, and particularly relates to a preparation method and application of probiotic fermented apple juice. The probiotic is Kluyveromyces marxianus CICC 32017, and the Kluyveromyces marxianus can overcome the defects that the fruit and vegetable juice is insufficient in fragrance and heavy in raw and green taste when being singly fermented by lactic acid bacteria. The method for preparing the fermented apple juice comprises the following steps: juicing apples; performing enzymolysis; performing sterilization; the method comprises the following steps of: inoculating the apple juice with a Kluyveromyces marxianus CICC 32017 or a mixed microbial agent of the Kluyveromyces marxianus CICC 32017 and lactobacillus plantarum CICC 21801, and culturing for 48-72 hours in a constant-temperature incubator at the temperature of 30 DEG C, so that a large amount of organic acid is generated after fermentation is finished, the DPPH free radical scavenging rate and the ABTS free radical scavenging rate of the fermented apple juice are higher than those of a control group, the oxidation resistance is remarkably improved, meanwhile, aroma substances are increased, and the taste of the apple juice is improved. The quality of the fermented apple juice is greatly improved.

The invention relates to the technical field of compound fruit wine fermentation, and particularly discloses a compound fruit wine fermentation process for enhancing flavor quality and antioxidant activity by using plant lactobacillus, which comprises the following steps: (S01) taking concentrated apple juice, and diluting with purified water; (S02) mixing and compounding the Huyou full juice with the diluted apple juice in the step (S01); (S03) adjusting the pH value of the compounded mixed solution in the step (S02) to 4-5; (S04) inoculating special yeast for fruit wine into the compound mixed solution obtained in the step (S03); (S05) inoculating the compound mixed solution obtained in the step (S04) with plant lactobacillus; and (S06) fermenting the inoculation liquid obtained in the step (S05) to obtain a composite fruit wine finished product. The fruit wine has the characteristics of being relatively good in flavor diversity, high in health value and good in sensory flavor quality.

The invention discloses halomonas for efficiently synthesizing nano-selenium as well as a method for preparing the nano-selenium and application of the halomonas, and belongs to the technical field of biology. The Halomonas sp. CCTCC NO: M 20242266 disclosed by the invention has strong tolerance to high-concentration selenite, can efficiently convert the selenite into nano-selenium, and is simple in required culture condition, low in cost and easy to operate; the nano-selenium particles produced by utilizing the strain disclosed by the invention are stable in property and high in biological activity. The Halomonas sp. CCTCC NO: M 20242266 or a microbial agent of the Halomonas sp. CCTCC NO: M 20242266 or nano-selenium produced by utilizing the strain has wide development prospects in the fields of functional agriculture including planting industry and breeding industry, functional food processing, health food processing, medical product processing and the like.

The invention provides a polypeptide beverage containing PQQ and arginine and a preparation method of the polypeptide beverage. It is found for the first time that PQQ and arginine can effectively improve the antioxidant activity of the beverage, the beverage has good DPPH free radical scavenging rate and superoxide anion scavenging rate, and a beverage product with nutritional and healthy functions can be prepared.

The invention discloses a procyanidine compound hard capsule for a health food capable of maintaining beauty and keeping young. The procyanidine compound hard capsule is prepared from the following components: a procyanidine extract, chitosan, vitamins, collagen, hyaluronic acid, a lotus leaf extract, astragalus polysaccharide, casein phosphopeptides, D-mannitol, starch, magnesium stearate and gelatin. The invention relates to a production process and application of a procyanidine compound hard capsule for beauty and young keeping health food, and the production process comprises the following steps: step 1, adjusting a formula proportion by using a component proportion optimization model to obtain an optimal preparation effect; 2, solution preparation is conducted on all the components, and the prepared solutions are mixed together; step 3, drying the procyanidine compound solution by adopting low-temperature vacuum drying; and 4, metering the dried procyanidine compound powder by using a capsule filling machine, and sub-packaging the procyanidine compound powder into medicinal hard capsules. The beauty-maintaining, young-keeping and health-care effects are greatly improved.

The invention relates to a preparation method of a high-performance soybean protein emulsion film, which comprises the step of carrying out fibrosis denaturation on soybean protein by adopting an acetic acid-water binary solution, so that the hydrophobic property, the film-forming ability and the environmental interference resistance of the soybean protein can be remarkably improved. And further starting from a protein self-assembly fibrosis principle and a protein film forming theory, a soybean protein-based biological membrane with certain mechanical strength and flexibility is constructed through self-assembly fibrosis denaturation of protein molecules in an aqueous solution, so that the problems of poor mechanical property and high solubility of the existing protein-based biological membrane are effectively solved.

The invention relates to the technical field of polypeptide preparation by a fermentation method, in particular to a spina date seed fermented polypeptide beverage and a preparation process thereof. The semen ziziphi spinosae fermented polypeptide beverage is prepared by taking semen ziziphi spinosae degreased powder as a raw material and adopting a microbial fermentation method, the molecular weight of polypeptide is generally distributed between 4 kDa and 10 kDa, and the molecular weight is smaller and more concentrated. The spina date seed fermented polypeptide beverage obtained by the invention can improve the compliance of consumers, is convenient for the consumers to use for a long time, achieves the effects of health preservation, health care and prevention and treatment of diseases, and has important practical significance for development of traditional Chinese medicine resources and improvement of economic value.

The invention belongs to the technical field of tea beverages, and particularly relates to an ultrasonic-assisted preparation method of coffee leaf Kangpu tea with high antioxidant activity. The method mainly comprises the following steps: firstly, screening and cleaning coffee leaves, drying and crushing to obtain coffee leaf powder; extracting the coffee leaf powder with boiling water, and filtering to obtain a coffee leaf extract; kombucha is inoculated into the coffee leaf leach liquor, and seed liquor is obtained after culture; mixing the coffee leaf extracting solution with cane sugar, sterilizing, cooling the sterilized mixed solution to room temperature, and adjusting the pH value to obtain the pH-adjusted mixed solution; inoculating a seed solution into the pH-adjusted mixed solution to obtain an inoculated mixed solution, performing ultrasonic treatment to obtain the inoculated mixed solution subjected to ultrasonic treatment, and finally performing fermentation to obtain the coffee leaf Kangpu tea with high antioxidant activity. The flavor characteristics of the Kangpu tea and the coffee leaves are greatly integrated; in addition, the content of bioactive substances in the coffee leaf Kangpu tea is remarkably increased, and the oxidation resistance of the coffee leaf Kangpu tea is remarkably improved.

The invention discloses a flexible and stable three-layer porous structure hemostatic dressing and a preparation method thereof, and belongs to the technical field of biological medicine. The preparation method of the hemostatic dressing comprises the following steps: constructing a stable foaming system by using protein and polysaccharide, constructing a dual three-dimensional network by combining multi-source polysaccharide and tannic acid, and designing a large-area dressing structure by overlapping the dual three-dimensional network with cotton gauze; carrying out Ca < 2 + > cross-linking impregnation and freeze drying in a weak acid environment to prepare an integrally formed three-layer dual-network multi-source porous structure dressing; the dressing has three layers of different structures, has an extremely fast hemostatic effect, reduces the amount of bleeding, can effectively maintain the humidity of a wound, avoids invasion and infection of bacteria, and can quickly and effectively sterilize; good shape maintaining and recovering capability is realized; meanwhile, the advantages of the porous structure and the cotton gauze are integrated, the structure is enriched, the structural stability of the large-area dressing is improved, the dressing can be stored for a long time in a normal-temperature environment, and the physical basic performance of the dressing meets the requirements of medical dressings.

The invention relates to a water-soluble antioxidant nanosheet as well as a preparation method and application thereof in acute liver injury, and relates to the technical field of nano-drugs. The water-soluble antioxidant nanosheet disclosed by the invention is obtained by self-assembling two-dimensional transition metal disulfide and protein, and has proper size, good life compatibility and superstrong antioxidant activity. The water-soluble antioxidant nanosheet disclosed by the invention can be used for effectively treating acute liver injury induced by acetaminophen by inhibiting oxidative stress; damaged liver tissues can be effectively targeted, and a treatment effect is achieved; mitochondrial ROS level can be reduced, mitochondrial membrane potential can be recovered, and mitochondrial damage can be reduced; the level of inflammatory factors of the liver in the acute liver injury process can be remarkably reduced, infiltration of macrophages is reduced, and excessive inflammatory response of the liver is relieved. The preparation method of the water-soluble antioxidant nanosheet is a simple and green synthesis method, and raw materials are low in price and easy to obtain.

The invention relates to the technical field of ganoderma lucidum fermentation processes, and particularly discloses an aspergillus cristatus ganoderma lucidum fermentation process which comprises the following steps: S1, transferring a fungus block into a 5% NaCl + MYA solid culture medium in a super clean bench, culturing for 7 days under the condition of constant temperature and constant humidity of 28 DEG C, and repeating the process twice to activate a strain; inoculating the activated strain to a 5% NaCl + MYA plate culture medium, and culturing for 7 days under the condition of constant temperature and constant humidity of 28 DEG C; the method comprises the following steps: adding a proper amount of sterile water into an aspergillus cristatus flat plate cultured for 7 days, scraping spores, adding 1mL of spore liquid into a centrifugal tube filled with glass beads, shaking to break wall of ascospores, counting by using a blood cell counting plate, and diluting into spore suspension with corresponding concentration; s2, weighing a proper amount of ganoderma lucidum blocks, putting the ganoderma lucidum blocks into a fermentation bottle, adding distilled water, sterilizing for 20 minutes at 121 DEG C, cooling to room temperature, inoculating a proper amount of spore suspension, and culturing for 10 days at constant temperature and humidity at 28 DEG C; the aspergillus cristatus fermented ganoderma lucidum sporocarp obtained by the method is high in biological activity, and the bitter taste of ganoderma lucidum is obviously improved.

The invention provides a pea starch-tea polyphenol compound, which is prepared by taking pea starch and tea polyphenol as raw materials, carrying out microwave radiation treatment through a microwave reactor with a cooling water circulation system, washing with a 50% ethanol solution, centrifuging, taking a centrifuged precipitate mixture, and freeze-drying, the weight ratio of the pea starch to the tea polyphenol is as follows: 8-12 parts of the pea starch and 1 part of the tea polyphenol. The invention also provides coarse cereal brewing powder which contains the pea starch-tea polyphenol compound. The invention further provides new application of the pea starch-tea polyphenol compound and the coarse cereal brewing powder. The pea starch-tea polyphenol compound prepared by microwaves is high in slowly digestible starch content and resistant starch content, low in quickly digestible starch content and low in starch in-vitro hydrolysis rate. The raw materials of the brewing powder are simple and purely natural, the taste is rich and fine, the antioxidant activity is high, and the organism immunity is improved.

The invention provides a preparation method and application of lucid ganoderma nano powder, a lucid ganoderma polysaccharide extract or a lucid ganoderma triterpenoid extract, and belongs to the technical field of lucid ganoderma processing and preparation. The preparation method of the lucid ganoderma nano powder comprises the following steps: airing lucid ganoderma sporocarp, cutting into lucid ganoderma particles, and crushing the lucid ganoderma particles to obtain lucid ganoderma coarse powder; drying the ganoderma lucidum coarse powder at constant temperature, and performing superfine grinding on the dried ganoderma lucidum coarse powder to obtain the ganoderma lucidum powder. The ganoderma lucidum nano powder is successfully prepared through superfine grinding, the content of heavy metal in the ganoderma lucidum nano powder is low, the content of polysaccharide and the content of triterpenes measured in the ganoderma lucidum polysaccharide extract and the ganoderma lucidum triterpenes extract obtained through extraction of the ganoderma lucidum nano powder are high, and the antioxidant activity of the ganoderma lucidum polysaccharide extract and the antioxidant activity of the ganoderma lucidum triterpenes extract are high; further research finds that the ganoderma triterpenoid extract has remarkable activity of inhibiting brain glioma. Various functional products are prepared from the ganoderma lucidum nano powder, and the ganoderma lucidum nano powder has important significance and application value.

The invention discloses fish oil microcapsules and a preparation method thereof. The fish oil microcapsules are composed of the following components in weight: 5-15 parts of fish oil, 6-35 parts of composite wall materials and 0.2-2 parts of emulsifiers, and the water content is 1.5-2.0wt% based on the total mass of the microcapsules; wherein the composite wall materials contain 5-20 parts of rosemary extract. The microcapsules have the advantages of high embedding rate, simple preparation process, strong antioxidant activity and almost no fishy smell.

The invention discloses an extraction method of American ginseng glycoprotein, an obtained product and application, American ginseng is used as a main raw material, a natural eutectic solvent aqueous solution is used as a solvent, warm immersion stirring, ultrasonic and microwave extraction are performed in sequence to obtain an extracting solution, then the extracting solution is subjected to subsequent operations such as alcohol precipitation and free protein removal, and the American ginseng glycoprotein is obtained. The American ginseng glycoprotein is obtained. The American ginseng glycoprotein extraction method is simple in process, high in safety, high in yield and purity and suitable for industrial production, and the obtained American ginseng glycoprotein has liver protection / liver protection and antioxidant activity, can be prepared into drugs, health care products and food, provides clinical guidance and medication basis for patients with liver diseases, further improves the life quality of the patients and has a good clinical application prospect. And the method has good application value.

The invention discloses a preparation method of a nano-enzyme microelectrode and the nano-enzyme microelectrode. The method comprises the following steps: providing a substrate, and removing impurities on the surface of the substrate; sufficiently mixing solid powder of nano-enzyme with deionized water according to a preset proportion to obtain a nano-enzyme solution; the nanometer enzyme comprises an Au24Cd1 nanometer enzyme, an Au24Er1 nanometer enzyme or an Au25 nanometer enzyme; by taking an Ag / AgCl electrode as a reference electrode, a platinum sheet electrode as a counter electrode and the substrate as a working electrode, carrying out nano-enzyme deposition treatment in the nano-enzyme solution through an electrochemical workstation based on a multi-potential step method; and depositing the nano-enzyme on the surface of the substrate to obtain the nano-enzyme microelectrode. According to the embodiment of the invention, the preparation of various nano-enzyme microelectrodes can be realized, and the forest sensitivity and biocompatibility of the microelectrodes can be improved. The method can be widely applied to the technical field of electrochemical detection.

The invention discloses an ultrasonic-assisted self-assembled resveratrol nanocrystal as well as a preparation method and application thereof, and belongs to the technical field of anti-pneumonia drugs. According to the resveratrol nanocrystal prepared by the method, the particle size is 181.5 + / -2.27 nm, the PDI is 0.08 + / -0.07, the potential is-12.6 + / -0.85 mV, and the resveratrol nanocrystal has reliable stability under the condition that a stabilizer is not used and can be maintained for at least one week; compared with free resveratrol, the crystal form of the resveratrol nanocrystal is changed, and the problems of resveratrol solubility (saturation solubility is increased by 35.1 times compared with free resveratrol), in-vitro uptake (in-vitro uptake is increased by 3.5 times compared with free resveratrol) and lung retention can be solved. Meanwhile, the resveratrol nanocrystal shows anti-inflammatory, antioxidant and antiviral activities superior to those of free resveratrol, and comprehensively shows that the resveratrol nanocrystal has safety and effectiveness in the field of aerosol inhalation treatment of RSV pneumonia.

The invention discloses lactobacillus plantarum with high antioxidant activity, and belongs to the field of probiotic preparations and biotechnology thereof. Viable bacteria and dead bacteria of the lactobacillus plantarum LCC-605 provided by the invention have extremely strong antioxidant capacity, and the capacities of removing DPPH (1, 1-diphenyl-2-picrylhydrazyl), ABTS < + > and hydroxyl free radicals respectively reach 94.7%, 99.8% and 92.5%; the superoxide anion clearance rate reaches up to 27.9%; the highest reduction capacity reaches the equivalent weight of 547.4 mu mol / L L-cysteine hydrochloride; and the iron reducing power reaches the highest OD value of 0.8592. Therefore, the lactobacillus plantarum LCC-605 can be developed as a leavening agent, is applied to fermentation of animal milk and plant milk, and develops a fermented product with a potential anti-oxidation effect. Meanwhile, the strain can also be used as a natural antioxidant, and is widely applied to preparation of food, cosmetics, health care products, medical products and animal feed in the aspect of oxidation resistance.

The application belongs to the technical field of polymer materials, and particularly relates to a high-performance fiber composite material and a preparation method thereof. The preparation method of the high-performance fiber composite material comprises the following steps: adding pretreated aluminum oxide whiskers into a solvent, then adding pretreated carboxymethyl cellulose and gallic acid, and heating to reflux to obtain modified aluminum oxide whiskers; then mixing epoxy resin, the modified aluminum oxide whiskers, a curing agent and an accelerator uniformly to coat a film to obtain a resin adhesive film; and compounding the resin adhesive film and carbon fibers through hot pressing to obtain carbon fiber prepreg, and heating and curing the obtained prepreg to obtain the high-performance fiber composite material. The fiber composite material obtained by the application not only has high strength and rigidity, but also has excellent toughness, can effectively resist the impact of the external environment, has oxidation resistance and long-term stability, and has a wide application prospect in the fields of aerospace and new energy equipment.

The invention discloses a preparation method and application of a polylactic acid / chitosan double-layer membrane with oxidation resistance. The preparation method is characterized in that a polylactic acid / chitosan double-layer film is prepared by a solution casting method, the inner layer is a chitosan film, and the outer layer is a polylactic acid film; glycerol is used as a plasticizer, and one of tea polyphenol, a bamboo leaf antioxidant, phytic acid, a rosemary extract and ascorbic acid is used as an antioxidant to be added into the chitosan solution to prepare a chitosan-based membrane solution; polylactic acid is dissolved in dichloromethane to prepare a polylactic acid membrane solution; and drying and molding the chitosan-based membrane liquid, pouring the chitosan-based membrane liquid into the polylactic acid membrane liquid, and removing the solvent to obtain the polylactic acid / chitosan double-layer membrane. The polylactic acid and the chitosan are used as base materials of the double-layer film, and the natural antioxidant is introduced, so that the mechanical property and the oxidation resistance of the double-layer film are effectively improved.

The invention discloses an anthocyanin film with antioxidant activity for strawberry preservation, and a preparation method of the anthocyanin film comprises the following steps: fully dissolving a proper amount of anthocyanin freeze-dried powder in methanol to obtain an anthocyanin solution, then slowly dropwise adding the anthocyanin solution into a chitosan acetic acid solution, and uniformly stirring to obtain a mixture; dropwise adding a sodium polyphosphate solution into the mixture, uniformly stirring, and dialyzing; defoaming, casting, coating and drying to obtain the anthocyanin film. According to the invention, the anthocyanin is added into the traditional chitosan film, so that the prepared anthocyanin film has better mechanical property and good uniformity, and still has good antioxidant activity under the illumination condition; the appearance quality of the strawberries can be effectively maintained, and the refreshing time is prolonged.

The invention discloses a ganoderma lucidum-roxburgh rose bidirectional fermentation broth and a preparation method and application thereof, and belongs to the technical field of roxburgh rose fermentation broth preparation. Ganoderma lucidum is used as an original strain, roxburgh rose is used as a matrix component, and ganoderma lucidum-roxburgh rose bidirectional liquid fermentation is performed; the antioxidant activity of the ganoderma lucidum fermentation liquid and the antioxidant activity of the ganoderma lucidum-roxburgh rose fermentation liquid and the antioxidant activity of the mycelium extraction liquid and the antioxidant activity of the artificially cultivated sporocarp extraction liquid are compared, so that the influence of roxburgh rose on ganoderma lucidum liquid fermentation is explored, and a certain thought is provided for diversified development and utilization and technical innovation of related new products with ganoderma lucidum and roxburgh rose as raw materials.