76 results about "Phenethyl alcohol" patented technology

The invention discloses engineered saccharomyces cerevisiae and application of the engineered saccharomyces cerevisiae in synthesis of 2-phenethyl alcohol, and belongs to the technical field of genetic engineering. According to the engineering saccharomyces cerevisiae, saccharomyces cerevisiae CICC 33068 is modified, and the strain is modified through strategies such as aldrin pathway enhancement, precursor enhancement, tolerance optimization and cofactor balance. The constructed engineered strain has good metabolic performance and stability, not only is the tolerance of the engineered strain to 2-phenethyl alcohol improved, but also the production capacity of the 2-phenethyl alcohol is remarkably improved. Therefore, the engineered saccharomyces cerevisiae disclosed by the invention has remarkable advantages in production of the 2-phenethyl alcohol, can provide technical guidance for industrial production of the 2-phenethyl alcohol, and has a good application prospect.

The invention belongs to the technical field of forest chemical industry and natural perfume extraction and separation, and particularly discloses a superheated steam distillation separation and recovery method for perfume components in cinnamon oil rectifying still residues. The method comprises the following steps: processing the cinnamon oil rectifying still residues by adopting a steam distillation method taking normal-pressure superheated steam as a desorption medium, carrying out condensation cooling and phase separation on distilled oil-water mixed gas, and collecting oily liquid or crystalline solid containing cinnamon spice components, and carrying out one or more physical isolation methods such as freezing crystallization, vacuum fractionation or rectification, recrystallization and the like to obtain natural cinnamon monomer spices such as o-methoxycinnamaldehyde, o-methoxycinnamic acid, phenethyl alcohol and the like. The method has the advantages of low equipment investment, simple and feasible operation, low production cost, clean and pollution-free process, good operation safety, high industrial application feasibility and the like.

The invention discloses a strain of saccharomyces cerevisiae CPJ-02 with high acid resistance, high ethanol content and strong ester aroma generation and application of the saccharomyces cerevisiae CPJ-02, the strain of the saccharomyces cerevisiae CPJ-02 has been preserved in China Center for Type Culture Collection on June 27, 2024; the preservation number of the strain is CCTCC NO: M 20241388. The saccharomyces cerevisiae CPJ-02 strain is milky white to faint yellow after being cultured on a YPD solid plate for 48 hours, the surface is dry and matte, the texture is slightly rough, and the colonial morphology is round. The saccharomyces cerevisiae CPJ-02 strain has prominent high ethanol tolerance, and still has activity greater than or equal to 92% in a 12% ethanol environment; and the fermentation product is rich in aroma and high in ethyl caprylate and phenethyl alcohol content, more than or equal to 25 volatile substances are detected by GC-MS (gas chromatography-mass spectrometry), and the fermented product is rich in fruit fragrance and has ester flower fragrance. The saccharomyces cerevisiae CPJ-02 strain is suitable for production of high-concentration wines and directional production of low-concentration healthy fermented beverages, fermented foods and aroma compounds.

The invention discloses saccharomyces cerevisiae XJ-YSSCE010-1 with high temperature resistance, high ethanol yield and low fusel oil yield and application of the saccharomyces cerevisiae XJ-YSSCE010-1, and belongs to the technical field of microbial fermentation. The saccharomyces cerevisiae XJ-YSSCE010-1 disclosed by the invention is separated and screened from Maotai-flavor liquor yeast, and is preserved in the China General Microbiological Culture Collection Center (CGMCC), and the preservation number is CGMCC No.31174. The fusel oil comprises the following main components: n-propanol, isobutanol, isoamyl alcohol, phenethyl alcohol and the like, wherein isobutanol and isoamyl alcohol have the highest toxicity. The saccharomyces cerevisiae XJ-YSSCE010-1 disclosed by the invention shows the advantages of high yield of ethanol, low yield of fusel oil and no production of isobutanol and isoamyl alcohol in liquid fermentation and simulated high-temperature stacking fermentation experiments, and the saccharomyces cerevisiae XJ-YSSCE010-1 is applied to preparation of white spirit, so that the production efficiency of the white spirit is improved, and the quality of the white spirit is improved.

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.

The present application provides compositions and methods for treatment of ocular inflammatory conditions, dry eye diseases, and abnormal corneal neovascularization, using etiprednol. In one example, a composition is provided comprising a semi-fluorinated alkane compound such as, e.g., perfluorohexyloctane; and an additive selected from paraffin, propylene glycol diacetate (PGD), a hydroxyalkyl ester of an aliphatic fatty acid, a hydroxyacid alkyl ester, an alkyl ester of a fatty acid, phenethyl alcohol, ethanol, isopropanol, glycerol, propylene glycol, polyethylene glycol, n-butanol, or combinations thereof. Eye drops comprising the compositions are also provided. Methods of using the compositions are also provided and include methods for reducing one or more symptoms of ocular inflammatory conditions, dry eye diseases, or abnormal corneal neovascularization.

The disclosure relates to oral care compositions comprising guanidine in free or orally acceptable salt form, a cationic quaternary ammonium compound (e.g., a pyridinium compound) (e.g., cetyl pyridinium chloride (CPC)), a fluoride source, and optionally a zinc source (e.g., zinc lactate or zinc citrate and zinc oxide) as well as to methods of using and of making these compositions. 20 25 20 43 72 12 J un 2 02 5 2 0 2 5 2 0 4 3 7 2 1 2 J u n 2 0 2 5 A B S T R A C T T h e d i s c l o s u r e r e l a t e s t o o r a l c a r e c o m p o s i t i o n s c o m p r i s i n g g u a n i d i n e i n f r e e o r o r a l l y a c c e p t a b l e s a l t f o r m , a c a t i o n i c q u a t e r n a r y a m m o n i u m c o m p o u n d ( e . g . , a p y r i d i n i u m c o m p o u n d ) ( e . g . , c e t y l p y r i d i n i u m c h l o r i d e ( C P C ) ) , a f l u o r i d e s o u r c e , a n d o p t i o n a l l y a z i n c s o u r c e ( e . g . , z i n c l a c t a t e o r z i n c c i t r a t e a n d z i n c o x i d e ) a s w e l l a s t o m e t h o d s o f u s i n g a n d o f m a k i n g t h e s e c o m p o s i t i o n s . 2 0 2 5 2 0 4 3 7 2 1 2 J u n 2 0 2 5

The invention relates to a mycobacterium hydrolase and application thereof in preparation of flavors and fragrances, and belongs to the fields of enzyme engineering and mining and application of new enzyme resources. The hydrolase comes from mycobacteria, and the amino acid sequence of the hydrolase is shown as SEQ ID No: 2; the hydrolase MdHDL disclosed by the invention has relatively high catalytic activity and substrate concentration tolerance, and can efficiently utilize benzyl alcohol or phenethyl alcohol to react with p-nitrophenyl methyl acetate pNPA, p-nitrophenyl methyl butyrate pNPB or p-nitrophenyl methyl caprylate pNPO to synthesize essence and perfume substances with different flavors; the method is suitable for preparing flower fragrance and fruit fragrance type flavors and fragrances such as jasmine flower fragrance, rose fragrance, pineapple fragrance, banana fragrance and apricot fragrance by an enzyme method, has obvious industrial production potential, and provides technical basis and method guidance for preparing the flower fragrance and fruit fragrance type flavors and fragrances by the enzyme method.

The invention belongs to the technical field of agricultural pest control, and particularly relates to a novel drosophila melanogaster attractant and a preparation method and application thereof. The invention discloses a novel drosophila melanogaster attractant which comprises the following components in percentage by mass: 10%-20% of brown sugar, 1%-5% of acetic acid, 1%-5% of ethanol, 1%-5% of phenethyl alcohol, 0.5%-2.0% of oleic acid, 0.1%-1% of palmitoleic acid, 0.1%-0.5% of sodium benzoate, 0.2%-0.5% of ascorbic acid, 0.2%-0.3% of sodium carboxymethyl cellulose, 0.5%-1.0% of sodium dodecyl benzene sulfonate and the balance of water. Field test results show that the novel drosophila melanogaster attractant is high in trapping rate of drosophila melanogaster on fruit crops, the used raw materials are low in price, the preparation process is simple, the dosage form is a liquid dosage form, field application is facilitated, the novel drosophila melanogaster attractant can be widely applied to prevention and control of field drosophila melanogaster, and the market prospect is good.

The invention belongs to the technical field of electrochemistry, and particularly relates to an electrode applied to preparation of phenylacetic acid by electrochemical oxidation of beta-phenethyl alcohol and a preparation method and application thereof. The electrode comprises a substrate and a plating layer arranged on the surface of the substrate, and the plating layer comprises iron, cobalt and nickel. According to the electrode, beta-phenethyl alcohol can be converted into phenylacetic acid through high-selectivity electrochemical catalysis, the selectivity and the current efficiency of the product phenylacetic acid are both larger than 90%, side reactions such as oxygen evolution can be greatly inhibited in the electrolysis process, the oxygen content is smaller than 5%, and it is guaranteed that the electrolysis reaction is carried out safely.

The utility model relates to a device for refining acetophenone and alpha-phenethyl alcohol, which comprises a first rectifying tower provided with a first inlet, a first outlet, a first discharge port and an extractant inlet; the second rectifying tower is provided with a second inlet, a second outlet and a second discharge port, and the second inlet is communicated with the first discharge port; the third rectifying tower is provided with a third reboiler which is provided with a third inlet, a third outlet and a third discharge port, the third outlet is formed in the top of the third rectifying tower, the third discharge port is formed in the bottom of the third rectifying tower, and the third reboiler of the third rectifying tower is communicated with the second outlet; the material flowing out of the second outlet is condensed by a third reboiler and then is branched into two paths, one path flows back to the upper part of the second rectifying tower, and the other path is communicated with a third inlet; the cooler is provided with a material inlet and a liquid outlet, the material inlet is communicated with the third outlet, and the liquid outlet is used for discharging alpha-phenethyl alcohol. The energy consumption is reduced.

The invention relates to the technical field of non-alcoholic beverages, in particular to a zero-alcohol cocktail beverage with slight alcoholic flavor and a preparation method thereof, the beverage contains the following characteristic flavor compounds: 80-150 mg / L of ethyl hexanoate, 180-250 mg / L of phenethyl alcohol, 180-280 mg / L of isoamyl alcohol, 2.5-4.0 mg / L of beta-damascenone, and the balance of water. The alcohol content of the beverage is less than 0.05 volume percent, and accurate construction of complex flavor levels is realized by taking ethyl hexanoate as a fruit aroma main body, phenethyl alcohol as a wine aroma carrier and beta-damascenone as passion fruit characteristic aroma.

The invention discloses a synthesis method of hydroxytyrosol. The synthesis method comprises the following steps: (1) reacting p-hydroxyphenethyl alcohol as shown in a formula 1 with a bromination reagent in ethyl acetate at 0-25 DEG C to generate p-hydroxybromophenethyl alcohol as shown in a formula 2; (2) under the protection of nitrogen, reacting p-hydroxybromophenethyl alcohol in an aqueous solution of alkali in the presence of a copper catalyst and a ligand at 80-100 DEG C to generate hydroxytyrosol as shown in a formula 3; the copper catalyst is cuprous bromide; the ligand is phenanthroline. The raw materials and solvents required by the synthesis method are cheap and easy to obtain, the operation process is convenient and easy to implement, the synthesis method is environment-friendly, the reactant yield is high, the quality is good, and the synthesis method is suitable for industrial large-scale production.

The invention belongs to the field of antifungal agents, and particularly relates to a synergistic mildew-proof composition, application thereof and a method for inhibiting cigar tobacco leaf mildew. The synergistic mildew-proof composition is composed of phenethyl alcohol and isoamyl alcohol, and the volume ratio of phenethyl alcohol to isoamyl alcohol is (10-0.5): 1. After phenethyl alcohol and isoamyl alcohol are compounded, a strong synergistic effect is achieved, and it is guaranteed that a good anti-mildew effect can be achieved under the condition that the dosage is low. The synergistic mildew-proof composition is low in mildew-proof effective concentration and is a natural aroma substance, the potential influence of the mildew-proof process on the original flavor and sensory quality of the cigar tobacco leaves is greatly reduced, and meanwhile, the problem of residues caused by traditional chemical preservatives is also avoided.

The invention discloses ethanol-free perfume based on low-volatility ionic liquid and a preparation method of the ethanol-free perfume, and belongs to the technical field of perfume. The ethanol-free perfume provided by the invention is prepared from the following components in parts by mass: 60 to 70 parts of ionic liquid, 8 to 12 parts of phenethyl alcohol acetoacetate, 12 to 17 parts of vetimol-citric acid mixed anhydride, 3 to 7 parts of microencapsulated limonene, 4 to 6 parts of a humectant and 0.2 to 0.7 part of an antioxidant. The preparation method comprises the following steps: firstly, mixing the ionic liquid, the humectant and the antioxidant to obtain a carrier phase, then adding the phenethyl alcohol acetoacetate and the vetimol-citric acid mixed anhydride into the carrier phase, mixing, finally adding the microencapsulated limonene, mixing to form a suspension system, curing and filtering. According to the perfume provided by the invention, ethanol is replaced by choline-proline ionic liquid, so that the problems of dry skin, irritation and allergy caused by ethanol are avoided, and essence molecules are modified, so that the perfume has the performance of lasting fragrance.

The application belongs to the field of essence and flavor, and particularly relates to a lotus-scented essence and application thereof in cigarettes. The lotus-scented essence comprises the following components in parts by weight: gamma-butyrolactone 1-5 parts, hexanoic acid 1-8 parts, benzyl alcohol 0.1-1.4 parts, phenethyl alcohol 0.1-2.6 parts, benzoic acid 1-5.2 parts, 4-methoxybenzaldehyde 0.1-1.3 parts, dihydroactinidiolide 2-11.5 parts, and leaf alcohol 0.1-0.7 parts. The lotus-scented essence provided by the application is prepared by using food-grade raw materials, and has the style of lotus leaf extract and can be applied to cigarette flavoring and cigarette perfuming. The lotus-scented essence can reduce the use effect of lotus leaf extract in cigarettes, and avoid the quality fluctuation of natural lotus leaf extract caused by unstable factors such as lotus leaf varieties, planting conditions and climate.

The invention belongs to the technical field of agricultural pest control, and particularly relates to a preparation method and application of a Holotrichia diomphalia larva compound luring-insecticidal system. The system is composed of a composite attractant and a clothianidin suspending agent, the composite attractant comprises the following components in percentage by mass: 10% of smell attractant (mixing 2-butenoic acid and 2-phenethyl alcohol according to a ratio of 1: 1), 8% of saccharide and 82% of water, and the clothianidin suspending agent is an effective insecticidal component. According to the compound attractant, two odor attractants, namely 2-butenoic acid and 2-phenethyl alcohol, have a synergistic effect, so that the compound attractant shows a remarkable synergistic effect on larvae of Holotrichia diomphalia, and the attraction activity of the compound attractant is obviously superior to that of a single component. The compound attractant disclosed by the invention effectively attracts larvae to gather in a specific flavor source in a broad-spectrum manner, and has a synergistic effect with a clothianidin suspending agent, so that the insecticidal effect is remarkably improved, the use of chemical pesticides is greatly reduced, the compound attractant is green, pollution-free and residue-free, natural enemies are protected, the environment is protected, and green prevention and control of grubs are realized.

The invention relates to chilli sauce flavor essence as well as a preparation method and application thereof. The essence is prepared from the following raw material components: acetic acid, dimethyl disulfide, ethyl lactate, diallyl disulfide, diallyl trisulfide, allyl methyl disulfide, dimethyl trisulfide, 2-methylbutyric acid, alpha-terpilenol, phenethyl alcohol, phenylpropanol, ethyl caprate, fenugreek lactone, 2-methyl-2-pentenoic acid, linalool, hexanal, eugenol and ethyl caprylate. The chilli sauce is prepared from ethyl maltol, methyl cyclopentenolone, capsicum oleoresin, a chilli sauce Maillard reactant and caprylic capric triglyceride. The chilli sauce flavor essence prepared by the invention not only has the flavor characteristic of chilli sauce, but also has the taste of chilli sauce, and is full and pure in fragrance, high in simulation degree and stable in quality.

The application discloses a catalyst for preparing alpha-phenethyl alcohol through acetophenone hydrogenation and a preparation method and application thereof. The method comprises the following steps: (1) respectively preparing solution I comprising a nickel-containing salt, an aluminum-containing salt, an active agent and water and solution II comprising a sodium-containing salt, a silicon-containing salt and water; (2) adding bottom water into a reaction kettle, adjusting pH, and controlling the temperature of the reaction kettle; (3) adding solution I and solution II in parallel, adjusting flow to keep the pH value, and after the parallel flow is completed, reacting under stirring; (4) after the reaction is completed, filtering and beating, and the obtained filter cake is subjected to first drying, crushing, shaping, second drying and calcination to obtain a nickel-based catalyst. The catalyst is suitable for an alpha-phenethyl alcohol reaction generated through selective hydrogenation of acetophenone, can greatly improve the processing load of the catalyst, has high activity, and meanwhile, the selectivity of alpha-phenethyl alcohol is high, and the generation of by-products can be effectively reduced.

The invention provides saccharomyces cerevisiae engineering bacteria, construction thereof and application of the saccharomyces cerevisiae engineering bacteria in fermentation production of 2-phenethyl alcohol strong-flavor malt wine. The saccharomyces cerevisiae engineering strain is a recombinant strain with the ARO8 gene knocked out, and the growth performance and the fermentation performance of the saccharomyces cerevisiae engineering strain are not obviously different from those of an original strain. When the engineering strain is used for fermentation production of malt wine, the content of 2-phenethyl alcohol in the obtained fermented wine is increased by 23.73% compared with the content of 2-phenethyl alcohol in an original starting strain; by adding 1 g / L of L-phenylalanine into a wort culture medium for process optimization, the content of 2-phenethyl alcohol in the fermented wine is further increased by 353.43%. Through a strategy of combining strain modification and process optimization, the content of 2-phenethyl alcohol in the malt wine is remarkably increased, and the aroma quality of the malt wine is enhanced; the production process is compatible with a common malt wine production process, the equipment requirement is low, expanded production is easy to realize, and an effective technical path is provided for popularization and application of the genetically modified strain in the fermentation industry.

To provide a water-based coating film remover which is excellent in coating film removability and workability and does not contain benzyl alcohol.SOLUTION: The coating film remover of the present invention is a coating film remover containing 30% by mass or more and 85% by mass or less of phenethyl alcohol or phenoxyethanol as a component (A), more than 2% by mass and 5% by mass or less of organic bentonite or hydrophobic fumed silica as a component (B), and 10% by mass or more of water as a component (C), and not containing benzyl alcohol.SELECTED DRAWING: None

The invention relates to the technical field of biology, in particular to a phenylpyruvate decarboxylase ARO10 protein mutant and application of the phenylpyruvate decarboxylase ARO10 protein mutant in preparation of phenethyl alcohol. The invention discloses an ARO10 mutant. The phenylpyruvate decarboxylase mutant is obtained by mutating one or more of the 335th amino acid, the 339th amino acid and the 628th amino acid of phenylpyruvate decarboxylase ARO10 (the amino acid sequence shown as SEQ ID NO.1) from yeast. Experiments prove that the mutated phenylpyruvate decarboxylase protein can improve the specific reaction on phenylpyruvic acid, so that the phenethyl alcohol generation capability of saccharomyces cerevisiae is improved. Glycosyl transferase ARO10 mutant protein is expressed in microorganisms, the phenethyl alcohol conversion capacity of the microorganisms is obviously enhanced, and the industrial application prospect is good.

To provide a method that can enhance the flavor of spices in spice-containing foods and increase the depth of flavor of spice-containing foods. [Solution] The vinegar of the present invention is for addition to spice-containing foods, has a pH of 2.0 or higher and less than 4.0 at 20°C, contains at least one first aroma component selected from isoamyl alcohol and phenethyl alcohol, and at least one second aroma component selected from diacetyl and isovaleric acid, and when the total content of the first aroma component is Appm and the total content of the second aroma component is Bppm, The following formula (1): (1) 2.0 It is characterized by satisfying the following conditions.​

[Problem] The purpose of the present invention is to provide noodles having improved color tone and flavor in noodles containing a large amount of active gluten. [Solution] The problem is solved by using active gluten in which, in terms of the GC-MS analysis results of aroma components collected by an SPME method, the proportion of the peak area of 1-hexanol is 4% or less, the proportion of the peak area of acetic acid is 2% or less, the proportion of the peak area of (2E,4E)-2,4-decadienal is 1% or less, the proportion of the peak area of phenethyl alcohol is 0.1% or less, and the proportion of the peak area of (3E,5E)-3,5-octadiene-2-one is 4% or more relative to the peak area of the aroma as a whole.

The invention relates to the technical field of microorganisms, in particular to a zygosaccharomyces rouxii ZB445 and Weissella fusiformis ZF629 composite zymophyte agent and application of the zygosaccharomyces rouxii ZB445 and Weissella fusiformis ZF629 composite zymophyte agent. The compound fermentation inoculant provided by the invention has high stress resistance and excellent capability of producing alcohol and ester volatile flavor substances, is used for fermenting the thick broad-bean sauce, and can obviously increase the content of various key volatile compounds in the thick broad-bean sauce, including the total content of flavor substances such as alcohol and ester, so that the yield of the thick broad-bean sauce is increased. The content of key flavor compounds, especially phenethyl alcohol, 3-methylthio propyl alcohol, eugenol, ethyl caprylate and the like, is reduced, and meanwhile, excellent flavor amino acid accumulation capacity is also shown. The composite fermentation inoculant is used for fermenting the thick broad-bean sauce, so that the mellow fragrance and the fruit ester fragrance of the thick broad-bean sauce can be remarkably improved, the fresh, sweet and mellow feeling is enhanced, the overall fragrance and flavor of the thick broad-bean sauce are improved, the flavor and taste of the thick broad-bean sauce are richer, more complex, more harmonious and layered, and the overall flavor and quality of the thick broad-bean sauce are remarkably improved.

The application discloses a phenol-free polyamide self-adhesive paint for electromagnetic wire coating and a preparation method and application thereof, and comprises a film forming substance and a solvent, wherein the film forming substance comprises aliphatic polyamide resin, bisphenol A epoxy resin, oil-soluble phenolic resin, leveling agent and release agent; and the solvent comprises phenylethanol, butanol, ethanol and propylene glycol methyl ether acetate (PMA). The product manufactured by the application has the advantages of low toxicity and low atmospheric emission pollution, good physical and chemical properties, stable storage characteristics, ideal coating performance, excellent bonding characteristics, moisture resistance, deformation resistance and the like, can greatly improve the occupational health hazards of wire coating operation, and can obtain a green electromagnetic wire product, and has wide market application value.

The invention relates to a synthetic method of an organic intermediate, in particular to a synthetic method of p-chloromethyl styrene, which comprises the following steps: preparing p-chloromethyl-2-bromoethylbenzene from 2-phenethyl alcohol, and preparing p-chloromethyl styrene from p-chloromethyl-2-bromoethylbenzene as a raw material by adopting a phase transfer catalysis method. The synthesis method is mild in reaction and low in energy consumption, and high temperature and high pressure are not needed in the reaction process; the reactants do not react with the solvent and the phase transfer catalyst, so that the yield is improved, the side reaction is reduced, and a high-quality product is obtained by using the method.

The invention discloses a method for measuring benzyl alcohol, phenethyl alcohol, phenol and 3-phenylpropanol in wine by an internal standard method, which comprises the following steps: (1) sample pretreatment: weighing 5.0 mL of sample, adding 1.5 g of sodium chloride, and adding 10L of 1.05 g / L 4-chlorobenzyl alcohol as an internal standard substance to obtain a pretreated sample; (2) preparing a standard solution; and (3) determination: detecting and analyzing the pretreated sample by using gas chromatography-mass spectrometry. The detection of benzyl alcohol, phenethyl alcohol, phenol and 3-phenylpropanol in different wines is realized by combining headspace-solid phase microextraction and gas chromatography with an accurate mass spectrum method. The method is simple, convenient and rapid in sample pretreatment and accurate in qualitative and quantitative detection, can meet rapid detection of benzyl alcohol, phenethyl alcohol, phenol, 3-phenylpropanol and the like in the wine, and provides technical support for enhancing quality control of the wine.

This invention provides a method for purifying β-phenylethanol. The feed stream 1 is the bottom liquid from the styrene separation reaction of α-phenylethanol in the ethylene-phenyl co-oxidation process for producing propylene oxide. The method includes: receiving a solution stream 2 of thiourea compounds at the upper part of an extraction tower; receiving an extractant stream 3 in the middle part of the extraction tower; receiving the feed stream 1 at the lower part of the extraction tower; obtaining an oil phase stream 4 after impurity removal and extraction in the extraction tower; collecting waste liquid at the bottom of the extraction tower; passing the oil phase stream 4 into a crystallizer for crystallization and purification to obtain a product stream 5; the solution stream 2 of thiourea compounds is a thiourea compound, which can effectively remove aldehydes and ketones. This invention can obtain a high-purity β-phenylethanol product with acceptable aroma.

The invention relates to the technical field of intelligent monitoring, in particular to a tea tree disease and insect pest monitoring method based on machine learning fused with a gas sensor array. Volatile substances such as leaf alcohol, phenethyl alcohol, capraldehyde, linalool, farnesene, ocimene, geraniol, n-caprylic alcohol, benzaldehyde and leaf acetate are monitored respectively. By adjusting the working temperature of the sensor, multiple groups of sensor response data are collected, and the data are preprocessed. By comparing the combination of different dimensionality reduction methods and classification models such as a support vector machine and a convolutional neural network, optimizing the model performance by using cross validation and hyper-parameter tuning, selecting an optimal classification model, and in a concentration prediction stage, comparing various regression models respectively, and optimizing the model performance by combining cross validation and hyper-parameter tuning. According to the method, the tea plant diseases and insect pests can be efficiently and accurately monitored, and the method has a wide application prospect.