576 results about "De esterification" patented technology

The invention provides a bio-based 1, 4-butanediol composition as well as a preparation method and application thereof, and the bio-based 1, 4-butanediol composition comprises bio-based 1, 4-butanediol, 4-hydroxybutyric acid-(4-hydroxyl) butyl ester and bis (4-hydroxyl) dibutyl ether. The total mass content of 4-hydroxybutyric acid-(4-hydroxyl) butyl ester and bis (4-hydroxyl) dibutyl ether in the bio-based 1, 4-butanediol composition is 51 to 220 ppm. The bio-based 1, 4-butanediol composition has low hygroscopicity, and can maintain low water content after long-term storage; meanwhile, when the bio-based 1, 4-butanediol composition is used for polyester synthesis, the esterification time can be shortened, the reaction efficiency can be improved, side reactions can be reduced, and a polyester product with better damp-heat resistance stability can be obtained.

The invention relates to the field of medicines, foods or health-care products, in particular to big-fruit hawthorn heteropolysaccharide as well as a preparation method and application thereof. The large-fruit hawthorn heteropolysaccharide is prepared from galacturonic acid, glucuronic acid, mannose, xylose, arabinose, glucose, galactose, fucose and rhamnose. The weight-average molecular weight of the big fruit hawthorn heteropolysaccharide is 81.6 kDa to 157.3 kDa. The product has unique structures of complex monosaccharide composition, low molecular weight, appropriate uronic acid content, low esterification degree and the like; compared with CP which is single in structure and high in esterification, the CP is better in oxidation resistance and bile acid binding capacity; compared with hawthorn polysaccharide with low uronic acid content and high molecular weight, the hawthorn polysaccharide has the advantages that the enzyme inhibition activity is obviously enhanced, and the hawthorn polysaccharide has a wide prospect in development of functional food, health care products or medicines for regulating blood sugar / blood fat, resisting oxidation and preventing metabolic syndromes.

The invention discloses diglyceride prepared by an enzymic method as well as a preparation method and application thereof, and belongs to the technical field of deep processing of grease. The method comprises the following steps: adding fatty acid into a choline chloride-glycerol-urea ternary eutectic solvent, uniformly mixing, and then adding candida antarctica lipase B for esterification reaction to obtain a reaction mixture; separating the reaction mixture, and recovering an upper-layer oil phase; and separating and purifying the upper-layer oil phase to obtain the diglyceride. According to the method, the reaction rate is high, the selectivity of the diglyceride in the esterification process is high, the yield of the diglyceride can reach 65% or above by reacting for 1 h, the selectivity of the diglyceride is 75% or above, and the purity of the separated and purified diglyceride is 90% or above; in addition, the method is simple to operate, and the reaction product and the eutectic solvent can be separated through simple centrifugation after the reaction is finished; in addition, the monoglyceride content in the product is low, and the subsequent separation and purification difficulty is greatly reduced.

The invention belongs to the technical field of organic synthesis, and provides a preparation method of a cationic lipid compound, which comprises the following steps: (1) reacting 1, 5-dihalopentane, 2-tert-butyl glycolate and alkali to obtain a product G; (2) hydrolyzing the product G under an acidic condition to obtain a product H; (3) carrying out esterification reaction on the product H, the raw material C, 4-dimethylaminopyridine and a condensing agent in dichloromethane to obtain a product J; and (4) carrying out amination reaction on the product J, the raw material L and alkali in acetonitrile to obtain the cationic lipid compound. Compared with the prior art, the method has the relatively remarkable advantages that when the first part of halogenated long-chain alkyl ester H is synthesized by the method, 1, 5-dihalopentane and 2-tert-butyl glycolate are used as raw materials, the halogenated long-chain alkyl ester J is synthesized by a simple method, the product is obtained at a higher yield in synthesis, and the method is suitable for kilogram-level production. The route synthesis only comprises four steps of chemical reactions, and is suitable for industrial production.

The invention discloses a bio-based recoverable high-thermal-conductivity dynamic ordered network composite material and a preparation method thereof, and is characterized in that the material takes a bio-based multifunctional epoxy system and a carboxylic acid compound containing disulfide bonds as reaction monomers, and the reaction monomers are reacted under the conditions of high temperature and metal salt catalyzed epoxy-carboxylic acid esterification reaction to obtain the bio-based recoverable high-thermal-conductivity dynamic ordered network composite material. A dynamic ordered network structure simultaneously containing disulfide bonds and beta-hydroxyl ester bonds is constructed, and the dynamic ordered network can be used as a springboard for phonon transmission, serves as an efficient'thermal bridge ', and plays a role similar to an ordered'crystal domain', so that higher heat-conducting property is shown when heat-conducting filler is not introduced, high flexibility and intrinsic heat conduction are realized, and the service life of the material is prolonged. And the material is endowed with reprocessing and recycling characteristics. Due to the synergistic existence of carboxyl, hydroxyl generated by epoxy ring opening and metal coordination in the system, and in combination with electrostatic interaction, Van der Waals force and hydrophobic interaction, the material has the adhesion characteristic suitable for a thermal interface at the same time.

The invention relates to the technical field of catalysis, and particularly discloses a method for preparing pure biodiesel from kitchen waste oil through enzyme catalytic desulfurization. The method comprises the following steps: adding a Sm2O3 / ZrO2 solid acid catalyst into the kitchen waste oil for pretreatment to obtain pretreated waste oil, and then adding lipase into the pretreated waste oil for catalyzing transesterification to obtain the biodiesel. According to the method for preparing the pure biodiesel from the kitchen waste oil through enzyme catalytic desulfurization, in-situ esterification and synchronous desulfurization of free fatty acid can be completed in a single-step reaction, the stability of a conversion reaction is effectively improved, the production process is simplified, and the conversion efficiency of preparing the biodiesel from the kitchen waste oil is improved.

The invention belongs to the technical field of sewage biochemical treatment, and particularly relates to an internal circulation anaerobic reaction tower and an esterification wastewater treatment method.The internal circulation anaerobic reaction tower comprises a tower body, a rotary water distributor is arranged at the bottom in the tower body, two three-phase separators are arranged in the tower body in the height direction at intervals, and the two three-phase separators communicate with a gas-liquid separation cavity through ascending pipes; the gas-liquid separation chamber is located at the upper end of the tower body, a gas-liquid separation assembly is arranged in the gas-liquid separation chamber, the gas-liquid separation chamber is communicated with one end of the sinking pipe, the other end of the sinking pipe is located above the rotary water distributor, a gas-liquid mixture enters the gas-liquid separation chamber through the ascending pipe by virtue of the three-phase separator, and granular sludge settles and flows back under the action of gravity; after a gas-liquid mixture is stirred by the gas-liquid separation assembly, gas rises and is discharged out of the system, liquid flows back to the position above the rotary water distributor through the sinking pipe under the action of self gravity, stable internal circulation is formed, efficient backflow of sludge can be achieved without additional power, and the reaction efficiency and the treatment capacity are greatly improved.

The invention discloses a chemical-enzymatic coupling synthesis method of oseltamivir phosphate, which comprises the following steps: by taking monasic acid OS-01 as a substrate, sequentially carrying out S1 esterification, S2 ketalation, S3 selective ring opening, S4 TEMPO oxidation, S5 primary transaminase reaction, S6 acetylation, S7 secondary transaminase reaction and S8 phosphorylation reaction to obtain the final product oseltamivir phosphate OS-09. According to the method, the step of sodium azide required by a traditional route is avoided, the production safety and the industrialization possibility are enhanced, two different transaminases are used for respectively constructing different chiral centers, the steps of protecting groups and deprotecting groups on the traditional route are not needed, the overall route is short, the used chemical reagents are few, the yield is high, and the method is suitable for industrial production. The industrial requirements of environmental protection and low cost are met.

The invention discloses a platinum (IV)-pirfenidone compound prodrug, a preparation method and microenvironment remodeling anti-tumor application, and belongs to the field of medical technology and drug synthesis. A series of molecules are characterized by being platinum prodrugs modified by pirfenidone derivatives. The synthesis method sequentially comprises the following steps: oxidizing platinum drugs, modifying hydroxyl groups, and introducing pirfenidone derivatives through esterification reaction. A series of molecules are reduced into Pt (II) drugs at the focus to kill cancer cells, and meanwhile, the released pirfenidone derivative can remodel the tumor microenvironment. The platinum prodrug disclosed by the invention not only has excellent cancer cell killing ability, but also is relatively low in drug resistance and excellent in safety, can trigger immunogenic cell death, and is a brand new chemotherapy-immunotherapy method. A series of molecules are convenient to synthesize, the preparation process is simple, and the amphipathicity is excellent, the anti-cancer capability is excellent, the drug resistance and toxicity are low, and the clinical application prospect is good.

The utility model relates to the technical field of reaction kettles, and particularly discloses a sodium carboxymethyl cellulose esterification synthesis reaction kettle which comprises a reaction kettle body, a heating mechanism is arranged on one side of the reaction kettle body, a stirring mechanism is connected in the reaction kettle body and comprises a stirring shaft, a centrifugal disc is fixedly connected to the upper portion of the stirring shaft, and the centrifugal disc is fixedly connected to the lower portion of the stirring shaft. The heating mechanism comprises a heating box, a water inlet pipe and a water outlet pipe are respectively communicated between the upper part and the lower part of one side of the heating box and the reaction kettle, and a spiral pipe is connected between the water inlet pipe and the water outlet pipe; the spiral pipe is embedded in the reaction kettle, and the cross section of the spiral pipe is flat; according to the reaction kettle, the stirring sufficiency and the heating uniformity of raw materials can be improved, the layering phenomenon of the raw materials during reaction or the local high temperature or low temperature condition in the reaction kettle is avoided, and the reaction effect is ensured.

The invention belongs to the technical field of food functional ingredients, and particularly discloses a preparation method and application of low-ester pectin with a saltiness increasing effect. According to the method, high-esterification-degree citrus pectin is taken as a raw material, a degreasing reaction is optimized by regulating and controlling the concentration of alkali liquor, the reaction temperature, the reaction time and the reaction termination pH value, and dialysis, rotary evaporation and freeze drying processes are combined to prepare the low-ester pectin with a remarkable saltiness increasing effect. The prepared low-ester pectin with the esterification degree lower than 30% adsorbs Na < + > by utilizing enhanced electronegativity to generate a counter ion coagulation effect, and the retention time of Na < + > on the tongue surface is remarkably prolonged, so that the salty taste perception is effectively enhanced, and the purposes of increasing the salty taste and reducing the salt content are achieved. The low-ester pectin can be used as a salty taste enhancer to be added into food to achieve the effects of increasing salty taste and reducing salt, no peculiar smell is introduced, and the low-ester pectin has a potential health effect.

The invention provides a method for regulating and controlling growth and metabolism of caproic acid bacteria by using marine active peptides in a baijiu fermentation process. According to the method, the marine active peptides are added in an anaerobic fermentation stage of baijiu preparation to regulate and control the growth and metabolism of the caproic acid bacteria; wherein the marine active peptide is chlorella pyrenoidosa peptide, schizochytrium limacinum peptide, fish albumin peptide or euphausia superba peptide. According to the method, active peptides with specific sources are added into an anaerobic culture system, so that the growth of caproic acid bacteria can be promoted, energy metabolism can be enhanced, and the activity of key enzymes such as caproic acid dehydrogenase and caproic acid synthase can be activated, and therefore, the generation amount of flavor acids such as caproic acid and butyric acid can be increased, the fermentation quality can be improved, and the flavor level and esterification precursor substance content of Baijiu can be improved.

The invention discloses a preparation method of 6-nitro-m-cresol, and belongs to the technical field of organic synthesis.The method comprises the steps that raw materials are subjected to esterification, water washing, sulfonation, nitration, desulfonation and refining in sequence, and the 6-nitro-m-cresol is obtained. According to the method, it can be guaranteed that the intermediate product is the 6-nitro derivative, generation of isomer impurities such as 2-site and 4-site is greatly reduced from the source, the reaction path is clear, and atom economy is good. The method does not need to depend on complicated means such as time-consuming column chromatography or precise fractionation, the requirement for high purity can be met only through conventional extraction and crystallization operation, the technological process is simple, the method is very suitable for large-scale production, and the product purity (measured through HPLC (High Performance Liquid Chromatography)) can stably reach 98% or above.

The invention discloses an esterification reaction lipase screening method based on covalent bond docking, and belongs to the technical field of protein docking simulation. According to the method, parameters of an acylase intermediate are constructed, and then covalent docking and energy screening are performed on the acylase intermediate, so that prediction of lipase reaction activity and substrate selectivity is realized, and the defects that carbonyl carbon cannot be automatically identified, Ser-C covalent bonds cannot be established, double bonds / bond angles cannot be managed, and the reaction efficiency is low in traditional docking are overcome. The problems that in a covalent system, simulation of a nucleophilic attack path lacks a unified distance, angle and dihedral angle constraint system, and automatic and high-throughput screening of multiple lipases and multiple substrates is difficult to achieve are solved.

The application discloses a multifunctional biological imbibition agent and a preparation method and application thereof. The preparation method of the multifunctional biological imbibition agent comprises the following steps: (S1), alkylization reaction to obtain alkyl naphthalene; (S2), chloromethylation reaction to obtain halomethyl alkyl naphthalene; (S3), halogen alkyl nucleophilic substitution reaction to obtain hydroxymethyl alkyl naphthalene; and (S4), esterification reaction to obtain the multifunctional biological imbibition agent. The application further discloses application of the multifunctional biological imbibition agent as an imbibition agent in shale oil reservoir oil extraction. The application has the following advantages: (1) the reservoir adsorption amount is small, but the good wetting reversal characteristic is still maintained, and the emulsification is weak; (2) the high-temperature resistance is strong, and the temperature resistance reaches above 200 DEG C; (3) the preparation process is simple, and the yield is high; (4) the dosage is small, the cost is low, and the economic benefit is remarkable.

A catalyst containing a noble metal disposed on a carrier. The noble metal is present in an amount in the range of 0.1 wt% to 10 wt% based on the total weight of the catalyst. The carrier contains at least 50 wt% of silicon carbide based on the total weight of the carrier. The silicon carbide has a surface area of at least 5 m 2 / g. A method for preparing methyl methacrylate from methacrolein and methanol using the catalyst is also disclosed.

This invention discloses a method for preparing spiramycin EP impurity G, comprising the following steps: (1) adding spiramycin I to a solvent, adding alkali and esterification reagent, and selectively esterifying at 10-30℃ to obtain a compound; (2) adding the compound to a solvent, adding alkali and esterification reagent, and selectively esterifying to obtain a compound; (3) adding the compound to an acidic solvent with pH 0.8-2.0, and selectively hydrolyzing at 0-40℃ to obtain a compound; (4) adding the compound to a solvent, adding alkali, and selectively hydrolyzing to obtain spiramycin EP impurity G. This invention uses spiramycin I as a starting point and obtains spiramycin EP impurity G through selective esterification, esterification, and two-step selective hydrolysis. The product purity can reach over 94%, which is helpful for studying the metabolic pathways and processes of spiramycin and clarifying the absorption, distribution, metabolism, and excretion characteristics of the drug.

The application discloses a kind of bio-based dispersant and preparation method thereof, belong to surfactant field.The application uses the root bark acid of biological source and different carbon atom number alcohol as raw material, and ester group structure is prepared by simple esterification reaction and obtained from root bark acid ester, and ester group is a functional group that can be chemically hydrolyzed and biodegraded.The application provides that by the reaction of the root bark acid ester with styrene, the stilbene group root bark acid ester is obtained, the synthesis step is simple, and the reaction yield is high.The application also provides that by the condensation reaction of the stilbene group root bark acid ester with ethylene oxide, the bio-based dispersant is obtained, the bio-based dispersant is novel in structure, and excellent in dispersing performance, is a kind of bio-based, green, environmental protection product, has the dual effect of saving petroleum resources and protecting environment.It has important significance to promote the sustainable development in the field of surfactant.

The invention discloses a polyol gradient synergetic depolymerization-esterification coupling reaction device for PETG chemical recovery, and belongs to the technical field of depolymerization-esterification coupling reaction devices, the polyol gradient synergetic depolymerization-esterification coupling reaction device comprises a main reaction kettle, the main reaction kettle is of a vertical cylindrical structure, the top of the main reaction kettle is fixedly connected with a sealing cover, the sealing cover is connected with a plurality of feeding ports, and the feeding ports are communicated with the main reaction kettle. A liquid collecting cavity is connected below the main reaction kettle, a return pipe is connected to the bottom of the liquid collecting cavity, a one-way valve is arranged on the return pipe, a multi-stage alcohol feeding system is arranged on one side of the main reaction kettle, a gradient temperature control jacket assembly is arranged on the other side of the main reaction kettle, and an in-situ esterification module is arranged on the inner side of the main reaction kettle. According to the method, multiple alcohol reagents are introduced according to the gradient synergistic effect, the breaking requirements of different types of ester bonds in PETG molecules are accurately matched, the depolymerization and esterification processes are coupled in situ, efficient, low-consumption and high-valued closed-loop recovery is achieved, and the defects that depolymerization is not thorough, products are complex, the technology is tedious and the like when PETG is treated in the prior art are effectively overcome.

The utility model discloses a kind of esterification with stirring ripening device. The aforementioned stirring ripening device includes reaction kettle, detachably installed at the top of reaction kettle's stirring box, stirring mechanism installed on stirring box, fixedly installed at the bottom of reaction kettle's support and fixed mechanism being set in reaction kettle and being connected with stirring mechanism. The fixed mechanism includes connecting box, reaction box, magnet piece I and magnet piece II. The reaction box is filled with macroporous adsorption resin, and lipase is adsorbed and fixed thereon. The utility model constructs composite stirring system, can produce multi-directional shear force, so that liquor is fully stirred and mixed, improves liquor ripening effect, in addition, has the adsorption and fixation function of lipase, avoids lipase loss with liquor, realizes reuse, reduces ripening cost.

The invention discloses application of a lycium barbarum Lb03G03224 gene in catalysis of esterification of free carotenoids, the nucleotide sequence of the lycium barbarum Lb03G03224 gene is as shown in SEQ ID NO: 1, and the amino acid sequence of encoded protein is as shown in SEQ ID NO: 2. According to the present invention, it is found that the zeaxanthin dipalmitate and the isomer 9 (Z)-zeaxanthin dipalmitate thereof can be generated when the Lb03G03224 gene is expressed in the engineering escherichia coli for generating beta-carotene, beta-cryptoxanthin and zeaxanthin, such that the zeaxanthin dipalmitate and the isomer 9 (Z)-zeaxanthin dipalmitate can be produced, the protein coded by the Lb03G03224 has the function of catalyzing esterification reaction of carotenoid containing free hydroxyl and fatty acid acyl donor, and has important application value in in-vitro biosynthesis of esterified carotenoid.

This invention belongs to the technical field of pectin and discloses a high-gelling-strength low-ester pectin, its preparation, and its application in gels. The preparation method of the high-gelling-strength low-ester pectin is as follows: 1) Citrus peel residue is mixed with water, the pH is adjusted to 1.5–2, extracted at 65–75°C, centrifuged, and the supernatant is subjected to alcohol precipitation and washing, filtered, dried, and pulverized to obtain primary pectin; 2) The primary pectin is reconstituted, the pH is adjusted to 0.5–1.1, reacted at 40–60°C, subjected to alcohol precipitation and washing, dried, and pulverized to obtain low-ester pectin. The method of this invention is simple, easy to operate, cost-effective, and suitable for industrial production. The prepared low-ester pectin retains a relatively complete original pectin structure, with an esterification degree of 25%–35% and a gelling-strength of 120–150, significantly superior to low-ester pectin prepared by alkaline and enzymatic methods. The low-ester pectin of this invention is used to prepare gels, and the resulting sugar-free gels and sugar alcohol gels have high hardness and water-holding capacity.

This invention relates to the field of ethyl hexanoate processing technology, specifically to an automated continuous esterification equipment and method for natural ethyl hexanoate. It includes a reaction vessel, with a distillation column at the top. A primary condenser is connected to the top of the distillation column. The lower shell-side outlet of the primary condenser is connected to two parallel flow control lines. One flow control line connects to the upper end of the distillation column via a return pipe, and the other flow control line connects to a product recovery tank. The upper shell-side outlet of the primary condenser connects to a secondary condenser, and the shell-side outlet of the secondary condenser connects to a buffer tank, which is connected to a vacuum pump. A gas phase anti-impact structure is provided at the connection between the reaction vessel and the distillation column. This invention effectively improves the conversion rate and esterification quality of the ester through continuous esterification. The gas phase anti-impact structure effectively reduces the direct impact of the gas phase on the distillation column wall, significantly improving the gas phase control effect and the adaptability to the distillation process.

The invention discloses a synthesis method of pyrazine-2-alcohol, the synthesis route of the method is as follows: glycine is taken as an initial raw material, and a target product pyrazine-2-alcohol is obtained through esterification-ammonolysis-condensation three-step reaction process, the esterification-ammonolysis-condensation reaction process can be continuously carried out, so that the post-treatment process is greatly reduced, the yield is increased, and the production cost is reduced. Compared with non-continuous production, the method has the advantages that double periodic production times can be completed within the same time, and meanwhile, the wastewater amount and the equipment cost can be effectively reduced. The method has the advantages of low raw material cost, simplicity in operation, high product yield, environmental friendliness and the like, is suitable for large-scale production, and has a certain industrial prospect.

The invention belongs to the field of novel food flavors, and particularly discloses a high-temperature-resistant natural milk flavor as well as a preparation method and application thereof, and the high-temperature-resistant natural milk flavor comprises the following components: 10-30 parts of butter enzymatic hydrolysate, 80-150 parts of reconstituted milk enzymatic hydrolysate, 20-30 parts of whey protein powder, 100-130 parts of maltodextrin, 100-120 parts of composite modified starch, 1-5 parts of a high-temperature protective agent and 300-500 parts of deionized water. The preparation method comprises the following steps: respectively preparing butter enzymatic hydrolysate and reconstituted milk enzymatic hydrolysate; mixing and emulsifying the whey protein powder and the composite modified starch with a wall material system consisting of the whey protein powder, the maltodextrin and the composite modified starch, homogenizing and sterilizing, and spray-drying to obtain the whey protein powder. The composite modified starch is prepared by performing octenyl succinic anhydride esterification and sodium trimetaphosphate cross-linking composite modification on cassava raw starch. Through the synergistic effect of composite enzymolysis, a specific wall material system and a high-temperature protective agent, the industrial problems that the fragrance of the natural milk-flavored essence is easy to lose and the flavor is unstable during high-temperature processing are successfully solved.

The application belongs to the technical field of oil and fat preparation, and particularly relates to a preparation method of a glyceride oil with weight loss effect and application thereof. The method comprises the following steps: first, adding oil and fat into a basic nutrient solution, adding a bacterial strain for fermentation, filtering, and obtaining a fermentation product; then, adding glycerol into the fermentation product, adopting a lipase esterification reaction, and centrifugally separating to obtain an oil phase. The method adopts a dominant bacterial strain to degrade triglyceride, then adds glycerol, and adopts a dominant compound lipase to perform an esterification reaction, so as to obtain glyceride oil. The method can selectively generate 1,3-glyceride, and improve the proportion of the dominant oil and fat. Research shows that the glyceride oil prepared by the method has good weight loss and fat reduction effects, and has a good application prospect.

This invention discloses a low-temperature reverse flotation collector for collophane and its preparation method, belonging to the field of collophane flotation technology. The low-temperature reverse flotation collector for collophane of this invention is prepared from the following raw materials: linoleic acid, linolenic acid, and gallic acid. This invention generates a low-temperature reverse flotation collector for collophane containing two OH groups and one COOH group through an esterification reaction of linoleic acid, linolenic acid, and gallic acid. In acidic pulp, the flotation recovery rate is 20-50% lower than before the esterification reaction, and the dosage is significantly improved, resulting in a substantial increase in concentrate P2O5 grade and recovery rate. Furthermore, the low-temperature reverse flotation collector for collophane can be used for flotation at a low temperature of 5-10℃. The flotation foam generated during the flotation process has a short duration, low foam stability, and is easily defoamed, which is beneficial for continuous operation and tailings recovery.

DEPCT64 A humectant containing oil and other components for external use on the skin. In addition, a specific characteristic of this invention is that it contains an esterification product. Component A and component B, or the esterification product containing component A and component B. And the components C and the esterification products have a pH value of 0-160. Milligrams of KOH / gram and the mass ratio of fatty acid residues obtained from component B and fatty acid residues. Fats obtained from component C in fatty acid residues which make up the esterification products. Elements A, B, and C are equal to 99.9:0.1-45:55 elements. A: Polyhydric alcohols that are dipentaerythritol, erythritol, or sorbitan; B: Components. One or more fatty acids, or equal to two, selected from straight-chain saturated fatty acids with a certain number of carbon atoms. 6-10 atoms, C composition: 1 or more fatty acids, or equal to 2 types selected from fatty acids. Containing 6-28 carbon atoms (excluding element B). -----------------------------------------------------------

The application discloses a controllable visual carbon monoxide releasing agent and a preparation method and application thereof, the releasing agent is Fla and Cys P molecules, Fla molecules are prepared by taking N,N-dimethyl-p-phenylenediamine as raw material, and the Fla molecules are prepared by cyclization, selenium dioxide oxidation, then hydroxy aldehyde condensation with 2-hydroxyacetophenone ketone under alkaline conditions, and esterification after acryloyl chloride; the structure of the Fla molecules is broken after light irradiation, and CO molecules are released; Cys P can react with cysteine (Cys) to generate flavone molecules Fla, and the releasing agent realizes visual detection of cysteine (Cys) and controllable release of CO.