83 results about "Dimethyl disulfide" patented technology

The invention provides a temperature accurate control and flow state optimization method for replacing dimethyl disulfide with sulfur in a coal tar hydrogenation process, which comprises the following steps: after acquiring a blockage risk distribution diagram, deploying a flow sensor and a pressure sensor at key nodes of a pipeline in combination with real-time monitoring capability, and collecting dynamic data of a sulfur flow state; flow stability parameters are obtained; according to the fluctuation amplitude, adjusted sulfur flow state data are obtained, the flow velocity and viscosity change of sulfur in the pipeline are calculated through fluid mechanics simulation, and the flow state optimization degree is determined; after a process suitability evaluation result is obtained, the operation cost and the economic benefit improvement range of the sulfur substitution scheme are calculated in combination with a cost accounting model, and the cost control effect is judged by comparing the reference cost of dimethyl disulfide; through a cost control effect, a time sequence prediction algorithm is adopted to analyze sustainability of temperature control and flow state optimization in long-term operation, and a comprehensive optimization scheme of production process stability and economy is obtained.

The invention discloses a preparation method of dimethyl thio toluenediamine, which comprises the following steps: continuously introducing dimethyl disulfide into a reaction system containing diaminotoluene and a catalyst for reaction, and evaporating and condensing the dimethyl disulfide in the reaction process so as to bring out a byproduct methyl mercaptan, after the reaction is finished, purifying and decoloring by adopting a neutralization distillation method to obtain dimethyl thio toluenediamine; the neutralization distillation method comprises the following steps: adding dimethyl disulfide into a reaction solution after the reaction is finished for dilution, then filtering the reaction solution to obtain a filtrate, adding an alkali solution into the filtrate for neutralization, heating and stirring, and finally carrying out reduced pressure distillation. The preparation method disclosed by the invention has the advantages of small catalyst dosage, short reaction time, high product yield and economic and environment-friendly purification and decoloration modes.

The invention relates to a urine metabolism combined marker for diagnosing bladder cancer and a screening method of the urine metabolism combined marker. The urine metabolism combined marker is prepared from 2-methyl furan, dimethyl disulfide, octylene and acetophenone. The method for screening the urine metabolism combined marker comprises the following steps: carrying out chromatographic separation and mass spectrometry detection on a urine sample on the basis of a headspace automatic sampler in combination with a chromatographic column and a photochemical ionization time-of-flight mass spectrometry, preprocessing mass spectrometry data, and extracting spectrum peak data of metabolites in urine; the urine metabolism combination marker for diagnosing bladder cancer is obtained through further statistical analysis. The screening method of the urine metabolism combined marker for diagnosing the bladder cancer has the advantages of non-invasiveness, high-throughput detection, simplicity in operation and accurate result, and has a wide application prospect.

The application belongs to the technical field of organic synthesis, and particularly relates to a preparation method of 5-chloro-2-methyl-4-isothiazoline-3-ketone. N,N'-dimethyl-3,3'-dithiodipropionamide is mixed with ethyl acetate, cooled to 8-10 DEG C, and chlorine is added in stages, and the reaction is continued after the chlorine is passed; the adding mode of the chlorine is as follows: in the first stage, 25-30% of the chlorine is passed in 0.5h while maintaining the temperature of the reaction system at 10-12 DEG C; in the second stage, 25-30% of the chlorine is passed in 1h while maintaining the temperature of the reaction system at 13-14 DEG C; and in the third stage, the remaining chlorine is passed in 1.5h while maintaining the temperature of the reaction system at 15-18 DEG C. The application controls the generation of 5-chloro-2-methyl-4-isothiazoline-3-ketone by controlling the adding amount of the chlorine and the reaction temperature, and improves the yield of 5-chloro-2-methyl-4-isothiazoline-3-ketone.

The present invention relates to a composition for controlling wood pests and use thereof. Specifically, the composition of the present invention comprises dimethyl disulfide (DMDS) and carbon dioxide (CO2) as active ingredients to control pests present in or occurring on wood. The composition of the present invention replaces bromomethane, thereby minimizing environmental pollution, ensuring uniform diffusion of the composition, and having excellent control efficiency.

The present invention discloses a method for preparing dimethyl disulfide by methyl mercaptan sulfidation, which includes: (1) loading a yttrium-modified alumina catalyst in a shell-and-tube fixed-bed reactor, and then filling a solution of dimethyl disulfide and / or dimethyl polysulfide into the shell-and-tube fixed-bed reactor; (2) mixing liquid methyl mercaptan and liquid sulfur evenly through a pipeline mixer and continuously introducing them into the bottom of the shell-and-tube fixed-bed reactor to carry out a sulfidation reaction to generate a crude sulfide including dimethyl disulfide, dimethyl polysulfide, and hydrogen sulfide gas; (3) successively passing the crude sulfide through a first-stage, a second-stage, and a third-stage distillation column to remove hydrogen sulfide, methyl mercaptan, and dimethyl polysulfide respectively, so as to obtain high-quality dimethyl disulfide. The present invention uses a yttrium-modified activated alumina catalyst, which can greatly improve the activity of the catalyst and its selectivity for dimethyl disulfide, and make the single-pass conversion rate of dimethyl disulfide reach more than 90%.

An oral care composition is provided and includes a natural flavor extract, a sulfur source such as dimethyl disulfide, a stannous ion source, and a soluble metal ion source that prevents the formation of methyl mercaptan. The natural flavor extract may contain dimethyl disulfide as an impurity. The soluble metal ion source may include a metal salt, a metal oxide, or a combination thereof, and the soluble metal ion source may include a copper ion source, a silver ion source, a zinc ion source, or combinations thereof.

The application provides a preparation method of methyl sulfonic acid, which is obtained by reacting raw material dimethyl disulfide with nitrogen oxide, air and water in a certain proportion. The method has high raw material utilization rate, is green and environment-friendly, and is easy to be industrialized. By controlling the content of methyl methyl sulfonate and 1-methyl-2-((methylsulfonyl) methyl) disulfane in the dimethyl disulfide, the colority of the separated product is lower, and the melting range of the product is narrower.

The invention relates to the technical field of chemical preparation, and discloses a process for preparing lithium sulfide through hydrogenation of dimethyl disulfide or di-tert-butyl polysulfide, which comprises the following steps: preparation of hydrogen sulfide: in a first reactor, carrying out hydrogenation reaction on an organic sulfur source and hydrogen in the presence of a hydrogenation catalyst to generate hydrogen sulfide mixed gas; the organic sulfur source is dimethyl disulfide or di-tert-butyl polysulfide; synthesis of lithium sulfide: introducing the hydrogen sulfide mixed gas into a second reactor filled with lithium source slurry for reaction to generate lithium sulfide; the lithium source slurry comprises a lithium source and a cosolvent; the lithium source is lithium hydroxide or lithium carbonate. A two-step process of hydrogen sulfide preparation and lithium sulfide synthesis separation is adopted, hydrogen sulfide is prepared by hydrogenation of an organic sulfur source in the first reactor and then conveyed to the second reactor to participate in synthesis, high-purity lithium sulfide is obtained through the scheme, and the content of polysulfide is extremely low.

The invention discloses a palladium-copper monatomic alloy doped indium oxide composite material and a preparation method and application thereof, and belongs to the technical field of gas sensitive sensing materials.The method comprises the steps that indium oxide particles are sufficiently and evenly dispersed in water, a copper sulfate pentahydrate solution is added into dispersion liquid, solid-liquid separation and washing are conducted after sufficient ultrasonic stirring, and the palladium-copper monatomic alloy doped indium oxide composite material is obtained; a copper precursor ion modified indium oxide composite structure is obtained; the preparation method comprises the following steps: uniformly dispersing a copper precursor ion modified indium oxide composite structure in water, reducing, dispersing in water, and adding a certain amount of palladium nitrate to obtain the palladium-copper monatomic alloy doped indium oxide composite material. The material can be used as a sensing layer of a resistance-type semiconductor gas sensor, and realizes high-response, high-selectivity and low-cost detection of dimethyl disulfide.

The invention discloses sinorhizium xinjiangense APXJHT24-1 which has the functions of promoting growth and inhibiting aspergillus flavus, and the preservation number of the sinorhizium xinjiangense APXJHT24-1 is CCTCC (China Center for Type Culture Collection) M 2026229. According to the invention, the integration of two major functions of'generation of a characteristic antibacterial volatile matter of dimethyl disulfide 'and'efficient symbiotic nitrogen fixation' on a single strain is realized in Sinkiang Sinkiang rhizobium for the first time. The dimethyl disulfide released by the strain can accurately down-regulate expression of toxin synthesis key genes and spore development core genes in the aspergillus flavus, so that efficient bacteriostasis is realized on the molecular level. Through one-time inoculation, the strain can synchronously achieve the dual purposes of growth promotion and nitrogen fixation and source bacteriostasis at the rhizosphere ecological niche of the peanuts. Especially aiming at the biological characteristics of overground flowering and underground fruiting of peanuts, a lasting biological fumigation protection layer can be formed in a soil microenvironment in a legume development critical period.

The invention discloses a complexing inhibitor for inhibiting redissolution of heavy metal sulfide as well as a preparation method and application of the complexing inhibitor. The complexing inhibitor is prepared by compounding the following three components: a component A which is a metal salt, a component B which is an organic sulfur medicament and a component C which is an organic non-sulfur medicament, wherein the mass ratio of the component A to the component B to the component C is (1-2): (1-3): (2-6); the component A is selected from dithiocarbamate, and the component B is selected from at least one of dithiocarbamate, mercaptobenzothiazole or sodium dimethyl dithiocarbamate; and the component C is selected from at least one of chitosan, polyethyleneimine or 1-hydroxyethylidene-1, 1-diphosphonic acid. The inhibitor is especially suitable for preventing excessive sulfur ions from complexing and dissolving precipitated heavy metal sulfide in industrial wastewater treatment, and effectively controlling the concentration of heavy metal ions to rise.

The invention relates to the technical field of dimethyl disulfide production, in particular to a dimethyl disulfide production separation device which comprises a separation evaporation tank and a tank cover arranged on the upper end face of the separation evaporation tank, and an impurity cleaning assembly is arranged on the tank cover. Through the arrangement of the impurity cleaning assembly, impurities attached to the inner side wall surface of the separation evaporation tank can be cleaned up and down in a reciprocating manner, and the bottom end of the inner side of the separation evaporation tank can be scraped and cleaned, so that the cleaning range of the inner side wall surface of the separation evaporation tank is large, and the inner side wall surface of the separation evaporation tank is cleaned more thoroughly; impurities attached to the inner side wall surface of the separating and evaporating tank can be subjected to transverse and longitudinal cleaning force, so that the firmly attached impurities can be cleaned, in addition, the inner side wall surface of the separating and evaporating tank can be vibrated, so that the impurities attached to the inner side wall surface of the separating and evaporating tank are loosened, and the separating and evaporating efficiency is improved. Therefore, the cleaning capacity of the impurity cleaning assembly on impurities attached to the inner side wall surfaces of the branch evaporation tanks is improved.

The invention relates to a quantitative analysis method for determining trace dimethyl sulfide impurities in a dimethyl disulfide product, a high performance liquid chromatograph-variable wavelength detector is adopted for analysis, and the specific analysis method comprises the following steps: preparing a standard solution and a sample to be detected; and detecting the components of the sample to be detected by adopting a liquid chromatography system-variable wavelength detector (VWD). Wherein the detection conditions are as follows: a C18 chromatographic column, a quaternary pump and an automatic sampling system are adopted, a mobile phase A is ultrapure water, a mobile phase B is acetonitrile, the flow velocity is 0.8-1.2 mL / min, and the column temperature is 30-40 DEG C. According to the present invention, the strong ultraviolet response of DMDS is inhibited by using the high water phase environment, and the retention behavior and the peak shape of DMS are improved by using the solvation effect of the synergist so as to achieve the efficient separation of the main component and the trace impurity; in actual sample determination, the method successfully detects the residual trace DMS in the industrial grade disulfide, the result is stable and reliable, and the method is suitable for product quality control and process optimization.

The application belongs to the technical field of hydrogenation catalysts, and particularly relates to a performance improvement method of a hydrogenation refining catalyst. The performance improvement method of the hydrogenation refining catalyst controls the temperature of a reactor filled with the hydrogenation refining catalyst at 320-370 DEG C, uses aviation kerosene to flush the hydrogenation refining catalyst, and then uses normal industrial oil as a solvent to carry dimethyl disulfide to supplement sulfur to the hydrogenation refining catalyst, so as to improve the performance of the hydrogenation refining catalyst. The performance improvement method of the hydrogenation refining catalyst does not need to be regenerated outside the reactor, controls the pretreatment temperature of the catalyst, flushes the catalyst with aviation kerosene, and adds dimethyl disulfide in the reactor of the catalyst device for closed-loop circulation, so that the performance of the hydrogenation refining catalyst is improved, the influence of the change of the performance of the catalyst on the quality of industrial white oil is avoided, and the industrial white oil has good yellowing resistance.

The application provides application of n-methyl-n-pentyl thiourea as a collector in a sulfur-oxygen mixed copper-cobalt ore and a synchronous flotation method, and relates to the technical field of flotation. In view of problems of the traditional sulfur-then-oxygen process, such as a complicated process, a complex process, and influence of changes of oxidation and sulfidation rates on the flotation effect of the sulfidized copper-cobalt ore, the application provides a new flotation process and reagent, does not need to use a sulfidation agent for sulfidation, simultaneously floats and sulfidizes and oxidizes the copper-cobalt ore, and simultaneously floats the oxidized and sulfidized copper-cobalt ore by using an activator sodium dimethyl dithiocarbamate and a chelate collector n-methyl-n-pentyl thiourea. The flotation process of the application is simple, efficient, clean and efficient, and provides a new method, a new process and a new way for the flotation of the complex sulfur-oxygen mixed copper-cobalt ore.

This invention relates to the field of organic synthesis technology and discloses an apparatus and method for preparing sodium N,N-dimethyldithiocarbonylpropane sulfonate, comprising a support frame, a drive motor, a drum, a distribution plate, a push rod, and a striking sleeve. When drying is required, the drive motor rotates the drum, causing the raw material to tumble. Preliminary heating is achieved through heating elements. A portion of the raw material falls onto the distribution plate and slides down to the inner wall of the extrusion chamber. During drum rotation, the position of the protrusions on the drum's sidewall changes, causing the extrusion rod to move left and right. As the extrusion rod moves to the left, it pushes the end of the extrusion plate towards the inner wall of the extrusion chamber, crushing and pulverizing the material. The combination of crushing and drying methods ensures the material reaches the required size and achieves better drying results.

The invention belongs to the technical field of chemical synthesis, and particularly relates to a dimethyl polysulfide composition and a preparation method and application of dimethyl disulfide. According to the dimethyl polysulfide composition provided by the invention, the content of each component in the composition is specially regulated and controlled, the composition is used as a raw material to react with methyl mercaptan to prepare dimethyl disulfide, the purity is greater than 99.8%, the appearance is colorless transparent liquid, the chromaticity is less than 25 Hazen, and the dimethyl disulfide is free of foul smell and is an environment-friendly superior product; the product can be sold as a food flavor fumigant, and has great market competitiveness. According to the preparation method of dimethyl disulfide provided by the invention, the reaction process is carried out in a protective atmosphere, the technological process is simple, no toxic reagent is used, the operation is safe and non-toxic, and potential safety hazards are avoided.

The invention relates to the technical field of chemical engineering, in particular to a device for purifying dimethyl disulfide, which comprises a disulfide storage tank; the side surface of the disulfide storage tank is connected with a crude disulfide pump through a pipeline, and the output end of the crude disulfide pump is connected with a crude disulfide preheater through a pipeline. The device for purifying dimethyl disulfide is provided with three rectifying towers, namely the crude disulfide removal tower, the refined disulfide removal tower and the finished disulfide tower, and the original six rectifying towers are reduced to three rectifying towers; the temperature of the three rectifying towers can be controlled through thermometers, and the three rectifying towers realize the characteristic of independently collecting mercaptan, methanol, disulfide and polysulfide through different pressure and temperature control, so that the subsequent purification process is reduced, the cost is reduced, and the production efficiency is improved. And the tower top reflux (disulfide-containing methanol and mercaptan) part of the disulfide fine removal tower returns to the disulfide coarse removal tower, so that the problem that the methanol and disulfide contained in the raw material methyl mercaptan are difficult to rectify can be solved through the large cycle operation.

The invention provides a carbon-coated nickel-chromium catalyst with an external sulfur source and a preparation method and application thereof, and the preparation method comprises the following steps: A) dissolving and mixing a nickel source, a chromium source and a carbon source in water, and removing a solvent to obtain a precursor; b) pyrolyzing the precursor in a protective atmosphere to obtain a catalyst precursor; and C) mixing the catalyst precursor with a sulfur source solution to obtain the carbon-coated nickel-chromium catalyst with the additional sulfur source, a sulfur source in the sulfur source solution comprises one or more of dimethyl sulfoxide, thioacetamide, thiourea, dimethyl disulfide, dimethyl sulfide and p-fluorothiophenol. According to the invention, a pre-sulfurization strategy of adding an organic sulfur source is innovatively adopted, so that the catalyst is endowed with low-temperature high efficiency, high selectivity and strong engineering suitability, and a bottom layer support is provided for kiloton-level industrial amplification.

The utility model discloses a multi-purification mechanism of a tail gas purification tower for dimethyl disulfide production, which comprises a purification tower main body, a gas inlet, a gas outlet, a spraying device and a filtering cavity. The multi-purification mechanism is provided with a filling adsorption device, a motor drives a rotating rod to rotate, and the rotating rod drives a rotating roller to rotate when rotating; when rotating rollers rotate, the activated carbon plates are driven to rotate, so that when tail gas is purified, the four groups of activated carbon plates can circularly adsorb and purify the tail gas, the utilization rate of the activated carbon plates is increased, and the purification effect is further improved, a rotating handle is rotated, so that the rotating handle drives a round rod to rotate, and the round rod drives a gear to rotate when rotating; when the gear rotates, the movable plate is driven to move, when the movable plate moves out of the range of the clamping groove, the fixing effect on the activated carbon plate can be canceled, the activated carbon plate can be taken out for replacement, through the arrangement, the activated carbon plate can be conveniently replaced, operation is convenient and rapid, the replacement effect is improved, and it is ensured that adsorption and purification can be smoothly carried out.

The present application belongs to the technical field of pesticide preparation, and provides a dimethyl disulfide granule, a preparation method and application thereof.The present application provides a dimethyl disulfide granule, which comprises molecular sieves, dimethyl disulfide loaded on the molecular sieves and a binder.The molecular sieves are granular solids, and have irregular pores and cavity structures inside the structure; the active ingredient dimethyl disulfide is wrapped in the cavities of the molecular sieves, has small irritating odor and low human exposure risk; and the dimethyl disulfide wrapped in the cavities of the molecular sieves has a slow-release effect, is beneficial to improving the effective period, can reduce the dosage under the condition of the same protection effect, and is beneficial to reducing the environmental pressure.The dimethyl disulfide granule provided by the present application is easy to degrade, friendly to the environment, and has the advantages of storage resistance, convenient use and transportation, and does not need special equipment when used, like the commercially available dimethyl disulfide technical material.

The invention discloses crab-flavor essence and a preparation method thereof. The crab-flavor essence is prepared from the following raw materials in parts by mass: 8 to 12 parts of butyl acetate, 5 to 9 parts of dimethyl disulfide, 4 to 7 parts of 2-acetylthiazole, 2 to 5 parts of pyridine, 6 to 10 parts of furfural, 3 to 8 parts of 2-amyl furan, 7 to 11 parts of alcohol compounds, 9 to 14 parts of ketone compounds, 6 to 11 parts of aldehyde compounds and 8 to 13 parts of pyrazine compounds. According to the crab-flavor essence, the alcohol compound, the ketone compound, the aldehyde compound and the pyrazine compound are added into the butyl acetate, the dimethyl disulfide, the 2-acetylthiazole, the pyridine, the furfural and the 2-amylfuran, and the crab-flavor essence which is rich in crab meat fragrance, high in fresh and sweet taste and high in crab meat flavor fidelity is prepared.

The invention discloses a Karl Fischer moisture determination method for sulfur-containing organic compounds, and belongs to the technical field of chemical analysis. The method comprises the following steps: adding absolute methanol, imidazole and an inhibitor (selected from N-substituted maleimide or acrylate compounds) into a titration system, then adding a sample, and titrating with a pyridine-containing Karl-Fischer reagent to the end point. The inhibitor can effectively capture reducing sulfur species and eliminate interference of the reducing sulfur species on iodine. Experiments show that for sulfur-containing samples such as 2, 2-dimethylthiopropane, dimethyl sulfide, dimethyl disulfide and the like, the deviation reduction rate of the method is more than 60% compared with that of a traditional method; the method is easy and convenient to operate, high in accuracy and suitable for moisture analysis of sulfur-containing organic matter in the fields of petrifaction, pharmacy and the like.

Examples of a biocide composition include an activated halogen compound selected from the group consisting of 2,2-dibromo-3-nitrlopropionamide; 2-bromo-2-nitropropane-1,3-diol; and 1,2-dibromo-2,4-dicyanobutane; benzisothiazolin-3-one; a pyridine-N-oxide selected from the group consisting of zinc pyrithione and sodium pyrithione; and a carbamate derivative selected from the group consisting of 3-iodo-2-propynyl butyl carbamate; zinc bis(dimethyldithiocarbamate); and bis(dimethyl carbamoyl) disulfide.

The invention relates to a method preparing a carbonated alcoholic beverage having an ethanol content of 2-12% ABV and a water content of at least 80 wt.%, said method comprising combining: • 0.03-10 parts by weight of beer distillate having an ethanol content of 50-98 wt.% and comprising 200-2,000 mg / kg of amyl alcohols, the beer distillate containing ethyl acetate and amyl alcohols in a weight ratio of ethyl acetate : amyl alcohols of less than 1:30; • 2-30 parts by weight of ethanolic liquid having an ethanol content of 25-100 wt.%; • 0.3-10 parts by weight of fruit juice concentrate; • 0.2-1.2 parts by weight of carbon dioxide; • 60-90 parts by weight of water. The beverage obtained by this method has a unique appealing taste. The beer distillate is an essential component of the beverage. The beer distillate combines a high ethanol content with a high content of amyl alcohols and other beer flavour components having a boiling point in the range of 80-210 °C, such as isoamyl acetate, ethyl caproate, furfural, linalool and dimethyl disulfide.

The application belongs to the field of gas sensors, discloses a kind of indium oxide composite material based on palladium doping and its preparation method and application, its preparation process is to utilize indium nitrate, anhydrous ethanol, ammonia, deionized water to prepare indium oxide material, then doping palladium ion in indium oxide solution to obtain palladium ion doped indium oxide solution, using sodium borohydride reduction, centrifugal to obtain palladium doped indium oxide composite material, then prepare into gas sensor.The application can effectively solve the problems of high activation energy required for pure indium oxide gas sensor reaction and lack of selectivity of pure semiconductor surface to sulfide by improving the design of key process flow of preparation method, and realizes the detection of dimethyl disulfide gas.

The utility model relates to the technical field of reaction kettles, in particular to a water bath constant-temperature dimethyl disulfide reaction kettle which comprises a constant-temperature water bath mechanism, and the constant-temperature water bath mechanism comprises a water bath shell, an internal water bath cavity, a bottom end constant-temperature heating module and a temperature detection module. Firstly, water in an internal water bath cavity is heated through a constant-temperature heating module at the bottom end, required materials can be conveyed into a mixing bin at the bottom end through a feeding pipe after heating is completed, and then a mixing rod is driven to rotate through a driving motor in a mixing top cover at the upper end; internal materials are fully mixed, the constant-temperature water bath mechanism is matched to improve the reaction efficiency, the temperature of water in an internal water bath cavity is measured through a data transmission temperature measuring pipe in the reaction process, and then temperature data is processed and then put on a display screen so that operators can observe the temperature data conveniently; after the reaction is completed, distillation work can be carried out to remove internal impurities.

The invention relates to a method preparing a carbonated alcoholic beverage having an ethanol content of 2-12% ABV and a water content of at least 80 wt.%, said method comprising combining: · 0.03-10 parts by weight of beer distillate having an ethanol content of 50-98 wt.% and comprising 200-2,000 mg / kg of amyl alcohols; · 2-30 parts by weight of ethanolic liquid having an ethanol content of 25-100 wt.%; · 0.3-10 parts by weight of fruit juice concentrate; · 0.2-1.2 parts by weight of carbon dioxide; · 60-90 parts by weight of water. The beverage obtained by this method has a unique appealing taste. The beer distillate is an essential component of the beverage. The beer distillate combines a high ethanol content with a high content of amyl alcohols and other beer flavour components having a boiling point in the range of 80-210 °C, such as isoamyl acetate, ethyl caproate, furfural, linalool and dimethyl disulfide.

An oral care composition is provided and includes a hops extract, where the hops extract includes dimethyl disulfide, a stannous ion source, and a stabilizing system including a Michael acceptor. The Michael acceptor has an alpha, beta-unsaturated carbonyl group. The alpha, beta-unsaturated carbonyl group can include an aldehyde, a ketone, a cyclic ketone, or a combination thereof.