644 results about "Vanillin" patented technology

The invention relates to an application of oxygenase in catalyzing 4-ethene guaiacol to synthesize vanillin. The amino acid sequence of the oxygenase comprises a sequence as shown in SEQ ID NO.1. The invention also relates to an application of the oxygenase in catalyzing 4-ethene guaiacol to synthesize vanillin. The invention provides an application of oxygenase in catalyzing synthesis of vanillin from 4-ethene guaiacol. The 4-ethene guaiacol oxygenase is in soluble expression in host bacteria. Crude enzyme liquid expressed by the strain stably catalyzes conversion of 4-ethylene guaiacol into vanillin, the conversion rate within 2 hours is 80%, the conversion rate within 24 hours exceeds 98%, and 11.5 g / L of vanillin can be accumulatively produced within 6 hours.

The invention relates to the technical field of multi-layer composite fabrics, and discloses a waterproof moisture-permeable composite fabric based on a bio-based material and a preparation method of the waterproof moisture-permeable composite fabric. The preparation method comprises the following steps: preparing an amino silanized zinc oxide / cellulose nanocrystal composite material, and carrying out mixed condensation polymerization on the amino silanized zinc oxide / cellulose nanocrystal composite material and vanillin cyclic carbonate to obtain an antibacterial agent; castor oil-based polyurethane, an antibacterial agent and a solvent are mixed and then subjected to electrostatic spinning, and after the electrostatic spinning and the pretreated polyester fabric are subjected to hot-pressing compounding, the obtained composite fabric has excellent waterproof and moisture permeable performance and good antibacterial performance.

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 discloses a corrosion inhibition type grey water scale inhibition dispersant and a preparation method thereof, belongs to the technical field of grey water dispersants, and aims to solve the problems of unstable scale inhibition performance and non-lasting scale inhibition efficiency of a grey water scale inhibition dispersant in the prior art. The technical problem that certain anti-corrosion and corrosion inhibition performance needs to be added to industrial grey water scale inhibition dispersants is urgently needed to be solved. The preparation method comprises the following steps that styrene, acrylamide and acrylic acid serve as raw materials, a polymer wall material is prepared, polyaspartic acid, a modified corrosion inhibitor and vanillin modified chitosan react, a core material is obtained, the core material and the wall material are prepared through a composite coacervation method, and the corrosion inhibition type grey water scale inhibition dispersing agent is obtained. The corrosion inhibition type grey water scale inhibition dispersant prepared by the invention has the advantages of stable and lasting scale inhibition effect and corrosion inhibition.

The invention discloses a formula for brewing fen-flavor liquor by replacing peas with mung beans and a brewing method, and relates to the field of liquor brewing, the fen-flavor liquor is composed of yeast and sorghum, the mass percentage of the sorghum to the yeast is 100: 20-25, the yeast comprises barley, peas and mung beans, and the yeast comprises, by mass, 58-65% of barley, 30-35% of peas and 5-10% of mung beans. The starch content of sorghum is not less than 70%. According to the formula for brewing the fen-flavor liquor by replacing peas with the mung beans and the brewing method, the mung beans are added, so that a liquor body is endowed with rounded and mellow taste experience while keeping the elegant and pure style of the traditional fen-flavor liquor; the special plant faint scent of the mung beans is also in delicate flavor synergy with vanillin and other substances of the pea source, so that the finished wine has the sensory characteristics of being clear but not light and mellow but not strong, the degree of dependence on high-price peas can be effectively reduced by introducing the mung bean raw material, and the raw material purchasing cost of per ton of wine is directly reduced.

The invention relates to the field of drain pipes, and discloses an antibacterial polypropylene noise-reduction drain pipe and a preparation method thereof, the antibacterial polypropylene noise-reduction drain pipe comprises polypropylene, modified glass fiber, an antibacterial additive, a compatilizer and a stabilizer; the modified glass fiber is prepared by performing formylation modification on glass fiber by using 3-aminopropyltriethoxysilane and glutaraldehyde, grafting triethylene tetramine and DOPO into a glass fiber structure, and then grafting a hindered phenol antioxidant; the antibacterial additive is prepared by compounding chitosan Schiff base and modified nano titanium dioxide, the chitosan Schiff base is prepared by utilizing a Schiff base reaction between chitosan and vanillin, and the modified nano titanium dioxide is prepared by utilizing isocyanate propyl triethoxy silane and ethyl glycolate to modify nano titanium dioxide. By adding the modified glass fiber and the antibacterial additive, the pipe is endowed with excellent heat resistance, aging resistance, flame retardance and antibacterial performance.

The invention belongs to the technical field of food fermentation production, and particularly relates to amycolatopsis thermophilus and application thereof. The amycolatopsis thermophilus is H-1 and is preserved in the China General Microbiological Culture Collection Center (CGMCC) on October 13, 2025, the preservation number is CGMCC No.36166, the classification name of the amycolatopsis thermophilus is Amycolatopsis thermophilus, and the preservation address of the amycolatopsis thermophilus is Beijing, China. The invention also discloses an application of the amycolatopsis thermophilus in preparation of vanillin. The highest yield of vanillin obtained by using the strain reaches 21.6 g / L.

The invention discloses a milk-flavor jelly-shaped intelligent response type suckling pig creep compound feed and a preparation method, relates to the technical field of animal feeds, and aims to solve the problems that a traditional feed is poor in palatability, nutrition release and physiological needs are mismatched, thermosensitive components are damaged by a high-temperature process and the like. And accurate release of nutrients is realized. The feed comprises an energy raw material, a protein raw material, intelligent response components (pH-sensitive sodium alginate microsphere loaded sodium butyrate / glutamine, temperature-sensitive xanthan gum-locust bean gum compound gel coated antibacterial peptide, and enzyme-sensitive lysine-lysine peptide bond cross-linked layer embedded glucose compound enzyme), a flavor system (vanillin microcapsules) and a konjac gum jelly matrix. A pH-temperature-enzyme triple response mechanism is adopted to adapt to the gastric acid gradient, body temperature fluctuation and pancreatin activity of suckling pigs; milk flavor slow release and nutrition release are in space-time synergy, and the ingestion frequency is increased by 40%; the konjac glucomannan matrix reduces dust, and the gel strength is greater than or equal to 750g / cm.

The invention relates to the field of copper-clad plates, and discloses a high-performance flame-retardant low-dielectric-loss copper-clad plate and a preparation method thereof.The copper-clad plate comprises epoxy resin, benzoxazine resin, composite filler, carboxyl-terminated nitrile rubber, an active diluent, a curing agent and the like; the composite filler is prepared by compounding flame-retardant modifier grafted graphene oxide and epoxy silane modified silicon dioxide hollow spheres; according to the flame-retardant modifier, boric acid and pentaerythritol are used for preparing a double-terminal hydroxyl boron-containing intermediate, then dichlorodiphenyl silane and phenylphosphonic dichloride react with hydroxyl groups at the two ends of the intermediate to prepare a flame-retardant intermediate, and amino silane and vanillic aldehyde react with chlorine atoms at the two ends of the intermediate to prepare an aldehyde modified flame-retardant intermediate; the copper-clad plate prepared by the preparation method disclosed by the invention is low in dielectric constant and dielectric loss, high in heat conductivity coefficient and good in flexibility, and also has excellent heat resistance and flame retardance.

The present invention provides a 4-vinylguaiacol oxygenase mutant for synthesizing vanillin, and an engineered bacterium thereof. The 4-vinylguaiacol oxygenase mutant is an enzyme having the sequence as shown in SEQ ID NO. 1, which exhibits a double-site mutation of D27P / T216M, D27P / M351F, D27P / Y156D, M351F / Y156D, T216M / Y156D or T216M / M351F, or a single-site mutation of T216M, T216L, S280M, G307P or M351F, and can be used for catalyzing 4-vinylguaiacol to generate vanillin.

The invention relates to the technical field of traditional Chinese medicine research, in particular to a discovery method of a cough relieving and phlegm eliminating quality marker of cough relieving granules and the quality marker. According to the application, the cough-relieving and phlegm-eliminating drug effects of the cough-relieving granules are evaluated by virtue of concentrated ammonia water cough inducing and phenol red excretion tests, plasma pharmaceutical chemistry research of the cough-relieving granules is developed by virtue of a UHPLC-Q-Exactive Plus Orbitrap HRMS technology, and 26 prototype blood-entering components of the cough-relieving granules are analyzed and identified; through network pharmacological analysis of components entering blood, 11 potential active components for relieving cough and eliminating phlegm of the cough-relieving granules are screened, relate to 40 common targets such as IL6, TLR4, STAT3 and the like, and mainly participate in signal channels such as PI3K-Akt, HIF-1, EGFR (epidermal growth factor receptor) and the like; the seven prototype blood-entering components are quantitatively analyzed by utilizing pharmacokinetics. The three compounds of azelaic acid, caffeic acid and vanillin are used as the cough relieving and phlegm eliminating quality markers of the cough relieving granules through effectiveness, transitivity and testability. The research result is of great significance in deeply defining the pharmacodynamic material basis of the cough-relieving granules, optimizing the quality standard and promoting the clinical application of the cough-relieving granules.

The invention belongs to the technical field of synthetic biology, and particularly relates to a method for artificially synthesizing vanillin by taking glucose as a substrate. According to the method, escherichia coli transformed bacteria transformed with a ferulic acid efficient synthesis module TTF, a ferulic acid synthesis vanillin function module AEL and a ferulic acid synthesis vanillin function module ODR are utilized, and the vanillin is prepared through fermentation with glucose as a substrate. The engineering bacterium constructed by the invention can efficiently synthesize and prepare natural vanillin, has a relatively prominent yield effect, and shows a relatively good application prospect. The microbial fermentation method is low in production cost, mild in preparation condition and low in preparation cost, and the prepared vanillin belongs to natural vanillin and can better meet the requirements of the fields of food, medicines, cosmetics and the like on natural vanillin, so that the method has better technical popularization and application significance.

The invention relates to the technical field of high polymer materials, and discloses a polypropylene material for an organic silicon product packaging bottle and a preparation method of the polypropylene material. The preparation method of the polypropylene material for the organic silicon product packaging bottle comprises the following steps: sequentially reacting polypropylene with a modifier and o-vanillin to obtain modified polypropylene; 4-amino-2, 2, 6, 6-tetramethylpiperidine is combined with the surface modified nanometer titanium dioxide, and modified nanometer titanium dioxide is obtained; and mixing the modified nano titanium dioxide, the modified polypropylene and the functionalized montmorillonite, carrying out melt blending, and extruding to obtain the polypropylene material for the organic silicon product packaging bottle. The polypropylene material provided by the invention has excellent mechanical properties, ultraviolet aging resistance, thermo-oxidative aging resistance and barrier property, can be used in organic silicon product packaging bottle materials, and improves the storage stability and safety of organic silicon products.

The invention discloses a solvent-free vanillin-hydroxyethyl acrylate double-system closed waterborne polyurethane emulsion adhesive as well as a preparation method and a use method thereof, and belongs to the field of waterborne polyurethane emulsion adhesives. The invention is mainly prepared from the following components in parts by weight: 40 to 50 parts of soft segment monomer, 50 to 60 parts of hard segment monomer, 20 to 40 parts of sealing agent, 0.02 to 0.15 part of catalyst, 0.4 to 0.6 part of emulsifier, 0.2 to 0.6 part of initiator, 4 to 12 parts of neutralizer, 5 to 15 parts of functional monomer and 340 to 360 parts of deionized water. According to the double-system closed waterborne polyurethane emulsion adhesive disclosed by the invention, rapid crosslinking curing of the adhesive can be realized through thermocuring, the highest hardness of an adhesive layer can reach about 26 MPa, the adhesive strength is high, and the mechanical property is relatively good.

The invention relates to the technical field of environment-friendly materials, and discloses a high-strength degradable packaging material and application of the high-strength degradable packaging material in cosmetic packaging materials.The preparation method of the high-strength degradable packaging material comprises the steps that polylactic acid, vanillic aldehyde modified polyester, polyadipic acid, triethyl citrate, calcium stearate and an antioxidant are added into a high-speed mixing machine, and the mixture is stirred to be uniform; mixing at 60 to 80 DEG C for 10 to 20 minutes to obtain a mixed material; the mixed material is subjected to melt blending through a double-screw extruder, the blending temperature is 160-180 DEG C, the screw rotating speed is 250-300 rpm, extrusion granulation and drying are conducted, and the high-strength degradable packaging material is obtained. The high-strength degradable packaging material can be applied to cosmetic packaging materials such as bottle bodies, bottle caps, hoses and packaging boxes. The prepared packaging material is high in mechanical strength and has good degradability and flame retardance.

The invention relates to the technical field of flame-retardant materials, in particular to a vanillin-derived nitrogen-phosphorus synergistic flame retardant as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out aldehyde-amine condensation reaction on vanillin and p-phenylenediamine to generate a Schiff base intermediate with a characteristic group-C = N-; and carrying out addition reaction on the intermediate and reactive hydrogen connected with a phosphorus atom on 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, so as to obtain the vanillin-derived nitrogen-phosphorus synergistic flame retardant. The flame retardant obviously improves the flame retardant grade of the high polymer material under the condition of lower addition amount, does not release toxic and harmful gases in the combustion process, and meets the requirements of greenness and environmental protection. The flame retardant has good compatibility with high polymer materials such as thermoplastic polyurethane and the like. The preparation method of the flame retardant is controllable in reaction process, large-scale production is easy to realize, an innovative and feasible solution is provided for flame retardance of high polymer materials, and the flame retardant is expected to be widely applied to the fields of electronics, automobiles, buildings and the like.

The invention belongs to the technical field of high polymer materials, and particularly discloses flame-retardant polylactic acid containing a vanillin-based flame retardant and a preparation method of the flame-retardant polylactic acid. The flame-retardant polylactic acid is prepared from the following components in parts by weight: 93.5 to 99 parts of polylactic acid, 0.5 to 6 parts of vanillin-based flame retardant and 0.5 part of antioxidant. The adopted bio-based flame retardant has a Schiff base structure and phosphorus element and is high in flame retardant efficiency, the main raw material vanillin adopted for synthesizing the vanillin-based flame retardant is reproducible and easy to obtain, the production process is simple, the sustainable development trend of materials is met, and the prepared vanillin-based flame retardant not only has efficient flame retardant efficiency, but also has good flame retardant effect. Moreover, the preparation process is non-toxic and environment-friendly, and the burden of the flame retardant on resources and the environment in synthesis and application can be effectively relieved.

The invention discloses a flame-retardant and self-repairing wood epoxy coating as well as a preparation method and application thereof, and belongs to the technical field of epoxy resin. The preparation method specifically comprises the following steps: (1) uniformly mixing vanillin, epichlorohydrin and tetrabutylammonium bromide, reacting, cooling, dropwise adding a NaOH aqueous solution, continuously reacting, washing, drying, precipitating and drying again to obtain bio-based epoxy resin for later use; (2) uniformly mixing methanol and hydrochloric acid, heating, carrying out condensation reflux, adding gamma-aminopropyltriethoxysilane, reacting, cooling, adding tetrahydrofuran, washing and carrying out vacuum drying to obtain polyhedral oligomeric silsesquioxane; and (3) dissolving polyhedral oligomeric silsesquioxane in the organic solvent, adding the bio-based epoxy resin, uniformly stirring, standing and curing to obtain the composite material. According to the invention, vanillin is used for constructing the epoxy resin containing imine bonds, so that the self-repairing and excellent flame-retardant properties of the epoxy resin are realized.

The invention discloses a high-strength geotextile and a preparation method thereof, and belongs to the technical field of geosynthetic materials, the high-strength geotextile comprises a polypropylene geotextile and a protective layer, and the preparation method of the high-strength geotextile comprises the following steps: soaking the polypropylene geotextile in titanium dioxide hybrid silica sol for dipping finishing for 30-40 min, and drying at 80 DEG C to constant weight to obtain the high-strength geotextile. The high-strength geotextile is obtained. In order to solve the problem of poorer aging resistance of polypropylene geotextile taking polypropylene as a raw material, titanium dioxide hybrid silica sol in the invention takes tetraethyl orthosilicate, long-chain alkyl silane, vanillin modified silane and tetrabutyl titanate as raw materials, and titanium dioxide and organic siloxane raw materials with different properties are introduced into a protective layer; the product strength, the acid and alkali / metal ion resistance, the ultraviolet radiation resistance and the like are improved, and the safety and the long-term effect of the product in a complex and harsh environment are enhanced.

The invention belongs to the technical field of high polymer materials, and particularly discloses a lignin-based charring agent containing silicon and nitrogen flame-retardant elements and an imine structure for flame-retardant polylactic acid and a preparation method of the lignin-based charring agent. The flame-retardant polylactic acid is prepared from the following components in parts by weight: 90 to 97 parts of polylactic acid, 1 to 3.33 parts of lignin-based charring agent and 2 to 6.67 parts of ammonium polyphosphate. The bio-based charring agent disclosed by the invention contains silicon and nitrogen flame-retardant elements and an imine structure, has remarkable charring and flame-retardant effects, is high in charring capacity, and can endow the PLA with relatively good flame-retardant property by compounding with ammonium polyphosphate and adding 1% of the lignin-based charring agent; the lignin and vanillin which are used as main raw materials for synthesizing the charring agent are bio-based sources and are easy to obtain, the production process is simple, industrial production is easy, the preparation process is non-toxic and environment-friendly, the dependence of charring agent synthesis on petroleum-based raw materials can be effectively relieved, and the sustainable development trend of materials is met.

The invention discloses a preparation method of a low-chlorine composite environment-friendly coal transportation anti-freezing agent, and belongs to the technical field of anti-freezing solutions. The anti-freezing solution is used for solving the technical problems of complex components and poor anti-freezing and metal corrosion resistance of the anti-freezing solution for coal transportation in the prior art. The preparation method of the low-chlorine composite environment-friendly coal transportation anti-freezing agent comprises the following step: uniformly mixing the compound pour point depressant, the modified corrosion inhibitor, the thickening stabilizer and the industrial water to prepare the low-chlorine composite environment-friendly coal transportation anti-freezing agent. The compound pour point depressant comprises an organic pour point depressant and an inorganic pour point depressant; the organic pour point depressant is obtained by reacting unsaturated azole, sodium methallyl sulfonate and fumaric acid; the unsaturated nitrogen is obtained by reaction of an intermediate B and benzaldehyde, and the intermediate B is obtained by reaction of triazole and ethyl chloroacetate; the modified corrosion inhibitor is obtained by carrying out a reaction on potassium thiocyanate, benzoyl chloride and chitosan vanillin Schiff base. The anti-freezing solution prepared by the invention has the advantages of moderate fluidity, good metal corrosion resistance and good anti-freezing performance.

The invention relates to a biosensor capable of efficiently responding to vanillin, and belongs to the technical field of bioengineering. An aldehyde response transcription factor YqhC from Escherichia coli and a promoter element PyqhD regulated by the aldehyde response transcription factor YqhC are used for establishing a vanillin response RFP report system, a yqhC gene is subjected to semi-rational design, a mutation library is constructed through saturated mutation, vanillin is used as a substrate, and a non-background fluorescence response, a non-background fluorescence response function and a non-background fluorescence response function are obtained by screening response concentration and response threshold values. The YqhC mutant has a wider substrate detection range (0-10 mM) and higher response strength (167 times), and is named as YqhC-V18. The biosensor containing a vanillin response element (YqhC-V18) and a fluorescent protein report element (RFP) is further obtained, and can be applied to detection of a sample containing vanillin, or screening of a vanillin production strain, or regulation and control of the production process of vanillin.

The invention belongs to the technical field of artificial veneers, and particularly relates to a fragrance-releasing blue-light-resistant microcapsule and a preparation method thereof, impregnated bond paper of the fragrance-releasing blue-light-resistant microcapsule, a fragrance-releasing blue-light-resistant ecological board and a preparation method of the fragrance-releasing blue-light-resistant ecological board. The technology aims at solving the problems of indoor blue light harm and air quality, and the problems that in the prior art, stable coexistence of a fragrance releasing component and an anti-blue-light component is difficult, and the technology is not compatible. The core is to prepare a multifunctional microcapsule through a unique interfacial polymerization and Schiff base in-situ reaction synchronous process: compound plant essential oil is taken as a core material, a vanillin-polyethyleneimine Schiff base conjugated structure is generated in situ in a wall material, and nanoparticles are cross-linked and fixed, so that a polyurethane / polyurea wall material is formed. The microcapsule is added into an adhesive layer of impregnated bond paper, and then is compounded with a base material through hot pressing to prepare the ecological board. The fragrance releasing and blue light resisting functions are successfully integrated on the board body, the effects that the blue light absorptivity at the wave band of 400-450 nm is larger than or equal to 70%, the formaldehyde release amount is smaller than or equal to 0.025 mg / m, and the fragrance is lasting are achieved, and the technology is highly compatible with an existing production line.

The invention belongs to the technical field of high polymer materials, and discloses a bio-based spiral macromolecular flame retardant as well as a preparation method and application thereof. The novel bio-based spiral macromolecular flame retardant PDVPA is successfully prepared on the basis of common industrial raw materials in combination with bio-based renewable vanillin, and the novel bio-based spiral macromolecular flame retardant PDVPA is applied to preparation of a flame-retardant TPEE composite material by adopting a melt blending process. The phosphorus element in the PDVPA molecular structure is used as a main flame-retardant functional group, and can promote the charring of the spiral structure of the PDVPA molecular structure; meanwhile, an imine bond can be subjected to a trimerization reaction under a high-temperature condition to form a cross-linked network structure, so that the molten drop phenomenon during TPEE combustion is effectively inhibited. The invention provides a new way for improving the safety performance of the high polymer material and reducing the dependence on fossil resources.

The invention provides an ultralow-temperature-resistant bio-based polyurea-polyurethane adhesive and a preparation method of the ultralow-temperature-resistant bio-based polyurea-polyurethane adhesive. The adhesive is prepared from the following raw materials in molar ratio: 0.5 of polyhydric alcohol; 1.0 part of isocyanate; 1.6 to 1.8 parts of hydrazide; and 0.6 to 0.8 part of vanillin dimer. The adhesive prepared by the invention has a very good bonding effect on 304 stainless steel, and can be used at an ultralow temperature. A polymer network contains rich polar groups such as carbamate and urea bonds, and the polar groups can form hydrogen bonds or other chemical bonds with substances such as oxides on the surface of metal, so that the adhesive has relatively high adhesive capacity on various base materials. According to the invention, the cheap and environment-friendly bio-based chain extender is used as a raw material, and a flexible polymer chain is used as a soft segment, so that the adhesive is endowed with the use performance at ultralow temperature while the high shear strength of the adhesive is ensured.

The invention discloses a medium-voltage flame-retardant cable and a preparation method thereof, and relates to the technical field of cables, and the medium-voltage flame-retardant cable comprises a cable core, an insulating layer, a thermal insulation layer, a flame-retardant layer and a protective layer which are sequentially arranged from inside to outside; the flame-retardant layer is prepared from the following raw materials in parts by weight: 50 to 70 parts of ethylene-vinyl acetate copolymer, 1 to 10 parts of bio-based flame retardant, 1 to 5 parts of calcium-zinc stabilizer, 0.1 to 1 part of antioxidant, 5 to 10 parts of plasticizer and 1 to 10 parts of porous sepiolite; the bio-based flame retardant is prepared from a POSS (Polyhedral Oligomeric Silsesquioxane)-based flame retardant and a vanillin-based flame retardant in a mass ratio of 2: (1-4). The medium-voltage flame-retardant cable disclosed by the invention has excellent flame-retardant performance.

The invention provides a thin-layer chromatography method for identifying lignum dalbergiae odoriferae and adulterants thereof, and belongs to the technical field of thin-layer chromatography analysis. By improving a developing system, the volatile oil and the flavone in the dalbergia wood can be simultaneously identified by only one developing solvent, so that the operation steps are simplified, and the identification time is shortened; according to the method, common and non-toxic cyclohexane, ethyl acetate and acetic acid are adopted as developing solvents, toxic and harmful reagents such as methylbenzene, trichloromethane and diethyl ether are prevented from being used, volatile oil and flavone are effectively separated, and meanwhile use of the toxic reagents is reduced; the invention also provides a novel volatile oil detection method, which comprises the following steps: spraying a mixed solution composed of a vanillin sulfuric acid solution and absolute ethyl alcohol, heating, and placing under a 365nm ultraviolet lamp for detection to display fluorescent spots with different colors, thereby overcoming the problem of weak identification capability caused by the color intensity in the existing method.

The invention discloses a method for efficiently trapping young tilapia mossambica. The method is mainly composed of specially-made baits and an improved ground cage. The bait is prepared from the following components: 20% of silkworm chrysalis meal, 20% of acete chinensis meal, 20% of earthworm powder, 12% of wheat germ powder, 11% of lamellar algae powder, 10% of snowflake powder, 5% of vital gluten and 2% of vanillin. The content of animal-derived protein in the bait is increased, so that strong fishy smell can be quickly diffused after the bait enters water; and the flaky algae powder, the snowflake powder and the wheat germ powder can form a suspended atomization belt around the bait, so that the bait is continuously peeled off, and the fish luring and retaining effects are better. The vanillin is added, so that the bait emits sweet milk fragrance, and surrounding tilapia mossambica can be effectively attracted. The following improvements are made on the ground cage: an anti-escape design is added; a bait bag is hung near the fish inlet; the space of a fish collecting area is expanded, so that the capturing efficiency is improved.

The invention relates to the technical field of epoxy resin coatings, in particular to a radiation-resistant self-repairing epoxy resin coating and a preparation method thereof. The radiation-resistant self-repairing epoxy resin coating comprises the following raw materials: a component A, a component B and a component C, wherein the mass ratio of the component A to the component B to the component C is (50-70): (40-50): (10-20); the component A comprises the following raw materials in parts by mass: 50-60 parts of bisphenol F epoxy resin, 8-12 parts of calix [5] arene, 1-2 parts of zinc acetylacetonate and 15-20 parts of a solvent; the component B is prepared from the following raw materials in parts by mass: 30 to 40 parts of octamethylcyclotetrasiloxane, 5 to 10 parts of gamma-aminopropyltriethoxysilane, 1 to 3 parts of vanillin, 0.5 to 1 part of a catalyst and 0.1 to 0.3 part of p-toluenesulfonic acid; and the component C is an amine curing agent.

The present invention provides a method utilizing the deletion of the regulatory protein gene tyrR1 and the overexpression of the tyrA-aroF genes to improve vanillin yield through fermentation with glucose as the substrate in Amycolatopsis. Additionally, the invention introduces a recombinant Amycolatopsis strain with a high vanillin yield, which has knocked out the regulatory protein gene tyrR1 and the pyruvate kinase gene pyk. This strain also overexpresses the endogenous chorismate mutase / prephenate dehydrogenase bifunctional enzyme gene tyrA, the 3-deoxy-7-phosphoheptulonate synthase gene aroF, and the phosphoenolpyruvate synthase gene ppsA. This recombinant Amycolatopsis ferments glucose to produce vanillin, achieving a yield of 4.72 g / L, significantly higher than that of existing technologies.