50 results about "Phenylacetaldehyde" patented technology

The invention discloses yoghurt oil with fruity flavor and a preparation method of the yoghurt oil, and belongs to the technical field of yoghurt oil processing. The Lactococcus lactis SITRS-0011 provided by the invention can be independently used as a leavening agent, when the Lactococcus lactis SITRS-0011 is used for fermenting yoghurt oil, the titration acidity can reach 83.21 DEG T, the yoghurt oil contains 2, 3-butanedione (1180 [mu] g / kg), acetoin (2092 [mu] g / kg), lactones (623 [mu] g / kg), 3-methylbutyraldehyde (117 [mu] g / kg), phenethyl alcohol (1863 [mu] g / kg), phenylacetaldehyde (336 [mu] g / kg) and other substances, and the Lactococcus lactis SITRS-0011 is rich in milk flavor, has flower fragrance and nut flavor, is unique in flavor, and can be used for preparing the and the overall sensory score is high.

The present invention discloses a pyruvate decarboxylase mutant with improved catalytic efficiency and its application. The present invention constructs a pyruvate decarboxylase mutant derived from Candida tropicalis for catalytic production of 4-hydroxyphenylacetaldehyde. The catalytic half-life (5.7 h) and TTN (24,600) of the mutant of the present invention are increased by 2.85 times and 2.07 times respectively compared with the control, and the mutant exhibits high decarboxylation activity. When the obtained mutant of the present invention uses 4-hydroxyphenylpyruvic acid as a substrate and reacts for 12 h at 25 °C and pH 6.5, the yield of 4-hydroxyphenylacetaldehyde can reach 5.08 g / L, and the molar conversion rate of the substrate reaches 67.28%. By adopting the method of the present invention, the production capacity of the unit catalyst and the reaction efficiency of the catalyst are improved, and the industrialization process of producing 4-hydroxyphenylacetaldehyde by the enzyme conversion method is accelerated.

The invention discloses Leishan fish sauce sour essence as well as a preparation method and application thereof. The leishan fish sauce acid essence is prepared from ethyl acetate, absolute ethyl alcohol, ethyl isovalerate, ethyl hexanoate, isoamyl alcohol, furfuryl alcohol, ethyl lactate, ethyl caprylate, acetic acid, diethyl succinate, methyl salicylate, ethyl benzoate, ethyl laurate, hexanoic acid, phenethyl alcohol, 4-methyl guaiacol, ethyl myristate, ethyl palmitate, ethyl oleate, capsicum oleoresin, ethyl phenylacetate and ginger oil. And lactic acid, glycerol triacetate, ocimene, ethyl isovalerate, ethyl butyrate, anethole and phenylacetaldehyde. The Leishan fish sauce sour essence disclosed by the invention is soft and harmonious in overall fragrance, natural and vivid, still has stable flavor characteristics at high temperature, can make up the problem of flavor deficiency in sour soup products, realizes accurate reproduction and controllable release of composite fragrance, improves the standardization level of products, and effectively improves the preference degree of consumers.

A mosquito repellent composition and a preparation method therefor and a use thereof, and a product having the composition, relating to the technical field of mosquito repelling. The mosquito repellent composition comprises in percentage by weight: 0.1-40% of a mosquito repellent active ingredient, 1-10% of an emulsifier, 3-8% of an antifreeze agent, 0.1-3% of a thickener, 0.1-2% of a defoamer, and the balance being water, or 0.1-40% of a mosquito repellent active ingredient, 1-10% of an emulsifier, 1-10% of a capsule wall material, 0.1-0.5% of a pH regulator, 3-8% of an antifreeze agent, 0.1-3% of a thickener, 0.1-2% of a defoamer, and the balance being water, wherein the mosquito repellent active ingredient comprises α-ethylidene-phenylacetaldehyde, or a tautomer or cis-trans isomer thereof. Compared with an α-ethylidene-phenylacetaldehyde technical material, the mosquito repellent composition has greatly improved thermal storage stability and a longer-lasting mosquito repellent effect. Compared with emulsions in water and capsule suspensions prepared by other formulas, the emulsion stability after thermal storage is greatly improved.

To provide a beverage that delivers a rich aroma while containing amino acid components such as theanine in high concentration.SOLUTION: The present invention relates to a beverage containing theanine and / or GABA, the beverage containing phenylacetaldehyde at a concentration of 5-1000 ppb.SELECTED DRAWING: None

The invention discloses a method for removing the fishy smell of chicken gizzards through multi-bacterium combined fermentation, and belongs to the technical field of poultry byproduct processing. According to the method disclosed by the invention, the chicken gizzards are subjected to fishy smell removal treatment by compounding the saccharomycetes Y4-1 and the bacillus SB. After fishy smell removal treatment, the content of key fishy smell substances including 1-octylene-3-alcohol, octanol, hexanal, nonanal and heptanal is greatly reduced, the total content is reduced from 25.15 mu g / g to 6.02 mu g / g and is reduced by 76.06%, heptanol, geranyl acetone, methyl heptanoate, methyl caprylate, glycerol monooleate, trans-2-decenal, 2-undecenal and other substances are completely removed, and the content of the key fishy smell substances is reduced by 76.06%. Meanwhile, elegant aroma components such as benzaldehyde and phenylacetaldehyde are generated. In conclusion, the saccharomycetes Y4-1 and the bacillus SB are compounded to remove fishy smell, so that the fishy smell substances of the chicken gizzards can be effectively removed, the flavor of the chicken gizzards can be further improved, and the edible value of the chicken gizzards is improved.

The present application provides a phenylacetaldehyde derivative as shown in formula (1), and also provides a preparation method of the phenylacetaldehyde derivative and the use of the phenylacetaldehyde derivative as a color developing agent for detecting aniline compounds. The present application also provides a method for detecting the content of aniline compounds and a method for monitoring the discharge of waste brine in an isocyanate production process. The phenylacetaldehyde derivative provided by the present application has strong color developing ability, and can quickly react and show obvious changes in color even at very low content of aniline compounds. The detection method provided by the present application is simple to operate, does not require expensive detection instruments, has accurate and reliable detection results, has low detection limit, and can also realize online detection and analysis. The monitoring method provided by the present application can collect data at different discharge sites in real time and judge the process operation condition in time, so that the abnormal working condition can be handled in time, the occurrence of downstream accidents can be avoided, the production safety is improved, and the environmental protection is also facilitated.

The present application relates to the technical field of pest attractant, in particular to a kind of corn borer adult food attractant.The food attractant is developed based on the corn borer flower visiting behavior, and is composed of three components of phenylethanol, phenylacetaldehyde and rosinene, the main components of Asclepiad flower fragrance, which has significant corn borer attracting effect in field, and can effectively attract both male and female adults at the same time, to achieve the purpose of population monitoring or centralized control.The present application does not directly contact crops, has the advantages of high efficiency, non-toxic and non-residue, and does not kill natural enemies, etc., and is an environmentally friendly green control new technology.

This invention discloses a method for synthesizing a tenapano hydrochloride intermediate. The synthesis method includes the following steps: (1) condensing the compound 3-bromophenylacetaldehyde and the compound N-methyl-(2,4-dichlorophenyl)methylamine under dehydration conditions to obtain an enamine intermediate; (2) subjecting the enamine intermediate to an intramolecular cyclization reaction in the presence of an acid catalyst to obtain the tenapano hydrochloride intermediate 4-(3-bromophenyl)-6,8-dichloro-2-methyl-1,2,3,4-tetrahydroisoquinoline. The synthetic route provided by this invention requires only two steps to construct the key framework, and has the advantages of short reaction steps, high overall yield, and no need to use highly toxic liquid bromine. This process has high atom economy, reduces the emission of waste gas, wastewater, and solid waste, and is suitable for large-scale industrial production under mild conditions.

The invention relates to the technical field of biomass resources, in particular to a method for preparing lignin-based quinoxaline by one-pot two-step catalysis of acidic HZSM-5-triethylamine, which comprises the following steps: by adopting a one-pot two-step method, preparing lignin-based quinoxaline from lignin or a lignin beta-O-4 model and o-phenylenediamine or a derivative as raw materials under the condition that an external hydrogen source and an external oxygen source are not needed, and preparing the lignin-based quinoxaline from the lignin or the lignin beta-O-4 model and the o-phenylenediamine or the derivative through one-pot two-step catalysis. The preparation method comprises the following steps: catalyzing carbon-oxygen bond breakage and oxygen transfer of lignin and a molding compound by using HZSM-5 to obtain an intermediate product monomer phenol and a phenylacetaldehyde compound, reacting the obtained phenylacetaldehyde structure with o-phenylenediamine under the catalytic action of triethylamine, and forming C-N bonds by aldehyde carbon and benzyl carbon with two N of o-phenylenediamine respectively; and carrying out dehydrogenation reaction to form the quinoxaline nitrogen-containing heterocyclic ring. According to the method, the quinoxaline is prepared by taking the lignin and the molding compound thereof as raw materials through one-pot two steps, the catalyst is cheap and easy to obtain, the acid site is easy to regulate and control, the use of a strong alkali system is effectively avoided, the requirements of sustainable development and green economy are met, and the method has an extremely good popularization and application prospect.

The invention belongs to the technical field of pesticides, and discloses a pesticide composition for tea tree diseases and a preparation method and application thereof. The pesticide composition is prepared from alpha-ethylidene-phenylacetaldehyde. Tests prove that the alpha-ethylidene-phenylacetaldehyde has an obvious inhibiting effect on the growth of tea anthracnose pathogen hyphae and can be used for preventing and treating tea anthracnose. According to the invention, alpha, alpha-ethylidene-phenylacetaldehyde is used as a synthetic spice for food, it is found for the first time that alpha, alpha-ethylidene-phenylacetaldehyde can be used as a potential disease control agent for control of tea tree diseases, has the characteristics of high efficiency, safety and no pollution, and effectively overcomes the problem of chemical pesticide residues.

The invention discloses 2-phenethyl alcohol-beta-D-glucoside catalyzed and synthesized by a cofactor self-circulating multi-enzyme cascade system and application of the 2-phenethyl alcohol-beta-D-glucoside. The system comprises phenylalanine dehydrogenase and a mutant thereof, wherein the phenylalanine dehydrogenase is used for converting L-phenylalanine (L-Phe) into phenylpyruvic acid (PPA); pPA is converted into pyruvate decarboxylase (Aro10) of phenylacetaldehyde; the alcohol dehydrogenase is used for reducing phenylacetaldehyde into 2-phenethyl alcohol (2-PE) or a mutant of the alcohol dehydrogenase; 2-PE is converted into sucrose synthase (SuSy) of 2-phenethyl alcohol-beta-D-glucoside (2PE-Glc) or a mutant of the sucrose synthase, and UDP-glucosyltransferase (UGT) or a mutant of the UDP-glucosyltransferase. A novel multi-enzyme cascade system with cofactor self-circulation capability is realized and is used for efficiently synthesizing 2PE-Glc from L-phenylalanine. The invention not only provides an effective 2PE-Glc biosynthesis strategy, but also shows the potential of a multi-enzyme cascade system in the aspect of synthesizing biologically active complex glycoconjugates.

The present invention discloses a method for preparing beer having an ethanol content of 0-1.0 vol. %, comprising providing a medium having an ethanol content of 0-20 vol. %, which medium comprises restricted-fermentation beer; subjecting said medium to a distillation step, thereby reducing the quantity of one or more aldehydes selected from the group consisting of 2-methyl-propanal, 2-methylbutanal, 3-methylbutanal, 3-methylthiopropionaldehyde, phenylacetaldehyde, hexanal, trans-2-nonenal, benzaldehyde and furfural in the medium, and thereby also reducing the ethanol content, if present, to a content in the range of 0-1.0 vol. %. The invention furthermore discloses beer obtained with the said process.

The invention relates to the technical field of food additives, and discloses a perigord truffle-flavored essence as well as a preparation method and application thereof. The perigord truffle-flavored essence is prepared from the following raw materials: caprylic capric triglyceride, propanethiol, dimethyl disulfide, 2, 5-dimethylpyrazine, 2, 6-dimethylpyrazine, n-hexanol, allyl isothiocyanate, 1-octylene-3-alcohol acetate, 3-octanol, 2, 3, 4-trimethyl-1, 3-pentanediol, 2, 3, 4-trimethyl-1, 3-pentanediol, 2, 3, 4-trimethyl-1, 3-pentanediol, 2, 3, 4-trimethyl-1, 3-pentanediol, 2, 3, 4-trimethyl-1, 3- The corrosion inhibitor is prepared from 2, 3, 5-trimethylpyrazine, phenylacetaldehyde, hexanoic acid, octanoic acid, gamma-decalactone, phenethyl isothiocyanate, 1-octylene-3-ol, 3-(methylthio) propyl isothiocyanate and dimethyl thiomethane. The perigord truffle flavor essence provided by the invention is rich in characteristic flavor of perigord truffle, high in smell fidelity and good in high-temperature-resistant stability, the addition amount of the perigord truffle flavor essence in food is small, and the rich characteristic flavor can be provided when the dosage reaches 0.2-0.5 wt%.

The present invention belongs to the technical field of the preparation of composite catalysts, and particularly relates to a preparation method and application of an Fe-P-α-MoC ternary catalyst, which comprises the following steps: S1: preparing an EDTA-FeNa solution; S2: preparing a PMA solution; S3: after mixing the obtained EDTA-FeNa solution and the obtained PMA solution evenly, aging by stirring in a water bath at 55-65 °C for 6-18 h, and then evaporating deionized water at 90-95 °C to obtain a solid powder; S4: loading the obtained solid powder into a tubular furnace, heating to 300-800 °C under a reducing gas atmosphere, and calcining at a constant temperature for 0.5-1.5 h. After cooling to room temperature at 25 °C, washing and vacuum drying for 24 h, the ternary catalyst is obtained. The ternary catalyst prepared by the present invention can catalyze the depolymerization of lignin to generate phenylacetaldehyde with high selectivity, the yield of phenylacetaldehyde monomer exceeds 50%, and it has high stability and a long service life.

The invention relates to the technical field of new energy, in particular to a preparation method of C9-C13 cycloalkane. The method comprises the following steps: in the presence of a base catalyst and a solvent, carrying out aldol condensation reaction on acetophenone and furfural or phenylacetaldehyde and furfural to obtain (E)-3-(cyclopent-1, 3-diene-1-yl)-1-phenylpropyl-2-ene-1-one or (Z)-3-(furan-2-yl)-2-phenylacrolein; under the action of a nickel-loaded catalyst, (E)-3-(cyclopentyl-1, 2, 4-triazole-3-yl)- The C9-C13 cycloalkane prepared by adopting the preparation method disclosed by the invention has the advantages of high density, high volume calorific value, excellent low-temperature fluidity and good thermal stability, and can be used for preparing the C9-C13 cycloalkane. The problems of low fuel energy density and insufficient performance in the prior art are solved.

The invention belongs to the technical field of biological control, and provides an application of phenylacetaldehyde in improving rice blast resistance, the application is characterized in that phenylacetaldehyde is used as a small molecule chemotactic agent to improve the rice blast resistance, and the effect of phenylacetaldehyde on inducing bacillus and further inhibiting rice blast bacteria is evaluated; results show that bacillus colonization can be directionally recruited by spraying phenylacetaldehyde on rice leaf surfaces, up-regulation of the expression quantity of the rice OsPR2 and OsNPR1 genes can be promoted, the disease resistance of rice to rice blast is enhanced, and a new path is provided for prevention and treatment of rice blast.

The present invention discloses leucine dehydrogenase mutants and their applications in the synthesis of non-natural α-amino acids, belonging to the technical fields of enzyme engineering and microbial engineering. The kinetic parameters were determined using phenylglyoxylic acid as a substrate. The catalytic efficiency (k cat / K m ) of the double mutant T143G / L49G was 16.84 mM ‑1 ·s ‑1 , which was 2.8 times higher than that of the wild type. At high substrate concentrations, it could effectively catalyze the synthesis of L-phenylglycine from phenylglyoxylic acid, and the conversion rate could reach 99%. The kinetic parameters were determined using 2-oxobutyric acid as a substrate. The catalytic efficiency (k cat / K m ) of the double mutant T143L / V303L was 34.08 mM ‑1 ·s ‑1 , which was 13.4 times higher than that of the wild type. At high substrate concentrations, it could still effectively catalyze the synthesis of L-2-aminobutyric acid from 2-oxobutyric acid, and the conversion rate could reach 99%. On the basis of successfully improving the catalytic efficiency (k cat / K m ), the double mutants T143G / L49G and T143L / V303L in the present invention still maintained the good temperature stability of the wild-type strain and had more practical industrial application value.

The invention discloses a beet armyworm repellent and application thereof. The beet armyworm repellent is prepared from the following components in percentage by volume: 0.01 percent to 0.2 percent of lauric aldehyde, 0.01 percent to 0.3 percent of phenylacetaldehyde, 0.1 percent to 2 percent of trans-2-dodecenal, 0.1 percent to 2 percent of trans-2-tetradecenal and 95.5 percent to 99.78 percent of a solvent. According to the beet armyworm repellent provided by the invention, lauric aldehyde, phenylacetaldehyde, trans-2-dodecenal and trans-2-tetradecenal are used as repellent active ingredients, all the active ingredients supplement each other, a synergistic effect is achieved, the beet armyworm repellent has good oviposition and antifeedant repellent effects on beet armyworms, the repellent rate on the beet armyworms is up to 97.66% + / -0.51%, and the repellent effect on the beet armyworms is up to 97.66% + / -0.51%. The repelling rate is obviously higher than that of a single active component. And the active components are all common natural plant components, are harmless to human bodies, are biodegradable, are environment-friendly, and are convenient and safe to use.

The invention discloses a brown sugar and preserved plum essence composition special for areca nut products and a preparation method thereof, and the brown sugar and preserved plum essence composition is composed of 10-20 parts of brown sugar base, 8-15 parts of preserved plum base, 3-8 parts of sweetening agent, 2-5 parts of acidulant, 40-60 parts of edible alcohol and 1-3 parts of stabilizer. The brown sugar base is composed of caramel aldehyde, citronellal, maltol, ethyl maltol and edible salt according to the weight ratio of (1-3): (0.5-1.5): (0.3-1): (0.2-0.8): (0.1-0.5), and the preserved plum base is composed of phenylacetaldehyde, ionone, heptanoic acid, benzyl acetate and lactones according to the weight ratio of (1-3): (0.5-1.5): (0.5-1.5): (0.2-0.6): (0.1-0.5). The brown sugar preserved plum essence composition disclosed by the invention is excellent in aroma richness, aroma retention time, taste harmony and stability.

The present invention relates to the technical field of varnishes for protecting security documents, such as banknotes, against premature detrimental influence of soil and / or moisture upon use and time. In particular, the present invention provides a hybrid UV-LED radiation curable protective varnish comprising:a) from about 60 wt-% to about 85 wt-% of either a cycloaliphatic epoxide, or a mixture of a cycloaliphatic epoxide and one or more cationically curable monomers other than the cycloaliphatic epoxide;b) from about 3 wt-% to about 15 wt-% of one or more radically curable monomers and / or oligomers;c) from about 1 wt-% to about 6 wt-% of a diaryl iodonium salt;d) from about 0.5 wt-% to about 3 wt-% of a free radical photoinitiator selected from the group consisting of alpha-hydroxyketones, alpha-alkoxyketones, benzyl diketals, benzoin ethers, phosphine oxides, phenylglyoxylates, and mixtures thereof;e) from about 0.01 wt-% to about 5 wt-% of a non-ionic surfactant; andf) a photosensitizer of general formula (I)wherein the weight percents are based on the total weight of the hybrid UV-LED radiation curable protective varnish.

The invention relates to application of a rare earth-based catalyst. The application comprises the step of carrying out hydrogenation reaction on hydrogenation raw materials in the presence of the supported catalyst Ir / CeO2 to obtain alcohol, wherein the hydrogenation raw material is selected from one or more of furfural, 5-hydroxymethylfurfural, 5-methylfurfural, m-tolualdehyde, benzaldehyde, phenylacetaldehyde, phenylpropionaldehyde, p-fluorobenzaldehyde, cinnamyl aldehyde, cinnamyl alcohol, cyclobutanone, cyclopentanone, cyclohexanone, cycloheptanone, tetrahydropyran-4-ketone, tetrahydrothiapyran-4-ketone, crotonaldehyde and terephthalaldehyde; the catalyst is prepared by a method comprising the following steps: mixing a CeO2 carrier with a solution containing a metal Ir precursor, and reacting under heating and alkaline conditions to obtain a catalyst precursor; and calcining and reducing the catalyst precursor to obtain the supported catalyst Ir / CeO2. The rare earth-based catalyst is simple in preparation process, mild in condition, high in hydrogenation activity and good in stability.

The invention belongs to the technical field of green prevention and control of injurious insects, and particularly relates to bait for preventing and controlling tobacco field capsella ciliata injurious insects and a preparation method and application of the bait. The bait is formed by mixing basic bait and a special attractant according to the mass ratio of (150-450): 1. The basic bait comprises the following components in parts by mass: 20-30 parts of white sugar, 40-60 parts of white vinegar, 20-30 parts of white spirit, 3-5 parts of agar, 4-6 parts of sodium alginate, 30-50 parts of peeled bananas and 150-280 parts of water; the special attractant comprises the following components in parts by mass: 3 parts of phenylacetaldehyde, 1 part of geraniol and 1 part of isobutyl acetate. The bait provided by the invention can be used for remarkably trapping, killing and controlling the insect pests in the tobacco field and reducing the population density of the insect pests. The bait formula is green and environment-friendly, can be effectively degraded into micromolecular organic matters or inorganic matters in the environment, is safe to the environment, and meets the basic requirements of green plant protection.

The invention discloses an extraction method of an active substance of Uligang and application of the active substance in anti-tumor drugs, and relates to the technical field of tumor treatment, dried Uligang is put into a smashing device to be smashed, and Uligang particles can pass through a 18-mesh sieve; putting the crushed Wuligang in a beaker, adding distilled water according to a material-liquid ratio of 1: 8, and then adding n-hexane to form a mixed solution; distilling the mixed solution, and layering the mixed solution after distillation to obtain a water layer and an n-hexane layer; adding analytically pure solid sodium chloride into a water layer of the mixed solution, extracting the saturated water layer by using diethyl ether, and drying after the extraction is completed; according to the present invention, the active substance phenylacetaldehyde is extracted from Urindigesting, and the phenylacetaldehyde can inhibit the energy metabolism pathway of tumor cells, such that the active substance phenylacetaldehyde is extracted from Urindigesting, such that the activity of the Urindigesting is improved, and the activity of the Urindigesting is improved.

This invention discloses a method for identifying tamarind maturity based on aroma markers. Through systematic research, this invention, for the first time, discovers the correlation between eight characteristic aroma markers and tamarind maturity: for unripe tamarind, phenylacetaldehyde, sec-butylamine, 5-acetoxymethyl-2-furfural, and tea spiroane; for ripe tamarind, 5-hydroxymethylfurfural, octanal, p-cymene, and styrene. This method is simple to operate, has an accuracy rate of ≥98%, and is suitable for tamarind harvesting and grading, quality evaluation, and processing quality control.

The application discloses a white tea hydrolat intelligent segmentation collection method based on characteristic aroma distillation kinetics identification, comprising the following steps: establishing the distillation kinetics curve of linalool, geraniol and phenylacetal by standardized distillation and high-frequency GC-MS detection; scientifically identifying the "composite high-efficiency distillation dynamic window" based on the comprehensive aroma index of weighted calculation; realizing intelligent segmentation collection through flow path switching according to the kinetic window parameters, and obtaining high-composite-aroma-purity hydrolat and high-linalool hydrolat respectively, and the aroma profile can be recombined and customized. The total content ratio of the three characteristic components in the obtained high-composite-aroma-purity hydrolat to the total amount of volatile aroma components is significantly improved, and the sensory score is excellent; the content and relative content of linalool in the high-linalool hydrolat are at a high level. The application realizes accurate enrichment of aroma components, improves the concentration of core components, and the product has pure aroma, batch stability, and is suitable for the fields of cosmetics, functional foods and the like.

The invention discloses a tubular C3N4 heterojunction photocatalyst as well as a preparation method and application thereof, the method comprises the following steps: firstly, preparing tubular C3N4 (TCN) from urea and melamine as raw materials, reacting the TCN with H3PO4 to obtain H3PO4 modified TCN (P-TCN), and finally, introducing phosphotungstic acid (PW) to construct the heterojunction photocatalyst (PW / P-TCN). According to the PW / P-TCN catalyst prepared by the invention, O2 adsorption is enhanced, separation and transfer of a photo-generated carrier are improved, exposure of active sites is increased, and meanwhile, efficient reduction and oxidation capabilities of the catalyst are maintained. According to the method, PW / P-TCN is taken as a photocatalyst, acetonitrile is taken as a solvent, a xenon lamp is taken as a light source, oxidative cleavage of C-C bonds of a lignin model compound is realized in a room-temperature oxygen atmosphere, and aromatic monomer products such as benzoic acid and phenylacetaldehyde are obtained.

The invention belongs to the field of food additive essence. The invention discloses pot gas essence and a preparation method and application thereof, and the pot gas essence comprises the following components: caprylic / capric triglyceride, benzyl alcohol, black pepper oil, 2-acetylpyrazine, methylcyclopentenolone, ethyl maltol, 4-hydroxy-2, 5-dimethyl-3 (2H) furanone, 2-tridecanone, acetic acid, 2, 5-dimethylpyrazine, furfuryl mercaptan, 1, 3, 4-trimethyl-1, 3-pentanediol, 1, 3, 4-trimethyl-1, 3-pentanediol, 1, 3, 4-trimethyl-1, 3-pentanediol, 1, 3, 4-trimethyl-1, 3-pentanediol, 1, 3, 4-trimethyl-1, 3-pentanediol, 1, 3, 4-trimethyl-1, 3- The invention relates to an anti-rust oil which is prepared from 1, 8-cineole, 3-(methylthio) propionaldehyde, oleic acid, phenethyl alcohol, sesame oil, 2-decenal, 2, 4-undecadienal, phenylacetaldehyde, 3-(methylthio) butyraldehyde, 3-(methylthio) propanol, bis (2-methyl-3-furyl) disulfide, 2-methyl-3-mercaptofuran and 2, 3-pentanedione. The pot gas essence can simulate real pot gas flavor, and prepared food is good in temperature resistance, high in verisimilitude, lasting and stable in flavor, small in dosage and low in cost and has high application value.

The present invention discloses a method for preparing beer having an ethanol content of 0-1.0 vol. %, comprising providing a medium having an ethanol content of 0-20 vol. %, which medium comprises restricted-fermentation beer; subjecting said medium to a distillation step, thereby reducing the quantity of one or more aldehydes selected from the group consisting of 2-methylpropanal, 2-methylbutanal, 3-methylbutanal, 3-methylthiopropionaldehyde, phenylacetaldehyde, hexanal, trans-2-nonenal, benzaldehyde and furfural in the medium, and thereby also reducing the ethanol content, if present, to a content in the range of 0-1.0 vol. %. The invention furthermore discloses beer obtained with the said process.

The invention relates to the technical field of perfumes, in particular to an efficient condensation process in perfume synthesis, which comprises the following steps: adding styrene oxide into a methylation reagent, and reacting under the catalysis of acid; after the reaction is finished, adding an alkaline solution to adjust the pH value to 7-8, standing for layering, and taking an organic phase; and evaporating the organic phase at 50-70 DEG C to remove the solvent, and rectifying to obtain the phenylacetaldehyde dimethyl acetal. The high-efficiency condensation process in the synthesis of the perfume-phenylacetaldehyde dimethyl acetal provided by the invention has the advantages of low cost, simple process procedure, low production energy consumption, high yield, total yield of 93% or more, good product quality, purity of 98.5% or more, and wide industrial application prospect.