55 results about "Dimethyl trisulfide" patented technology

The invention belongs to the technical field of natural environment water quality monitoring and discloses a method for determining eight kinds of common odorous substances in water simultaneously through use of a method of combining purge-and-trap and gas chromatography/mass spectrometry. The method can be adopted to determine eight kinds of common odorous substances such as dimethyl sulfide (DMS), dimethyl trisulfide (DMTS), 2-isopropyl-3-methoxy pyrazine (IPMP), 2-isobutyl-3-methoxy pyrazine (IBMP), 2-methyl isobornyl (MIB), beta-cyclocitral, geosmin (GSM) and beta-ionone in water simultaneously. Any report on the method for determining the eight kinds of substances in one step is not present yet. The method disclosed by the invention fills the gap and can be used for quantitatively analyzing the eight kinds of odorous substances in water in one step, so that the detection efficiency is greatly increased.

The invention discloses a method for continuously producing dimethyl disulfide. The method is characterized in that after being molten, a material sulfur is fed into a dimethyl trisulfide reactor by virtue of a feeding pump so as to react with recycled dimethyl disulfide to generate dimethyl trisulfide; dimethyl trisulfide and methyl mercaptan are feed into a dimethyl disulfide reactor so as to react to generate dimethyl disulfide; a dimethyl disulfide crude product is fed into a separating tank, so that most of hydrogen sulfide is separated out, a liquid-phase product is fed into a rectifying tower, a dimethyl disulfide product is condensed and recycled at a tower top, hydrogen sulfide is exhausted as a non-condensable gas, and the dimethyl disulfide and dimethyl trisulfide in a tower kettle are returned and recycled. A method of enabling dimethyl trisulfide to be excessive is adopted, so that methyl mercaptan is completely converted, separating requirements are lowered and a separating process is simplified, and therefore, not only can the dimethyl disulfide yield be improved to 90%, but also the product purity is up to 99wt%.

The invention belongs to the technical field of soy sauce production, and specifically relates to a preparation method of mellow-aroma dark soy sauce. The preparation method of the mellow-aroma dark soy sauce comprises the followings steps: (1) preparing raw materials, and carrying out treatment; (2) preparing koji; (3) carrying out fermentation; (4) carrying out squeezing; (5) carrying out firststerilization; (6) improving aroma, namely adding burnt sugar coloring into crude soy sauce sterilized in the step (5), adjusting salt content, adjusting pH value to 4.0-5.0, carrying out heating in asealed jar until the temperature reaches 60-70 DEG C, carrying out maintaining for a predetermined period, carrying out natural cooling, and carrying out storing for 4-12 months; (7) carrying out blending; and (8) carrying out second sterilization. Compared with dark soy sauce prepared by conventional methods, the dark soy sauce prepared by the preparation method has significantly increased contents of 4-ethyl guaiacol, dimethyltrisulfide, 4-ethylphenol, phenethyl alcohol and 3-methional; and thus, the dark soy sauce is mellow in aroma, significantly improved in sauce-flavor, and greatly increased in soy sauce flavor.

The invention relates to a chicken oily essence, which consists of the following components: 2-methyl-3-furanthiol, bis(2-methyl-3-furanthiol), 1,6-hexanedithiol , furanone, dimethyl trisulfide, 2-methylpyrazine, 2,3,5-trimethylpyrazine, 2,5-dimethyl-3-furanthiol, 3-methylthiopropanal , 4-methyl-5-hydroxyethylthiazole, 2,6-dimethylpyrazine, 2,4-decadienal, 2,4-nonadienal, furfuryl mercaptan, 1-octene- 3-Keto, distilled ginger oil, clove oil, 2-acetylfuran, nonanal, 4-ethylguaiacol, soy sauce ketone, 3-methylthiopropanol, trans-2-hexenal, 3- Methyl-2-butanone and soybean oil. The final formulated essence has a strong chicken flavor, can provide good chicken aroma and fragrance to soybean products, and has good aroma and fragrance stability.

The invention discloses a method for detecting dimethyl trisulfide in beer. The method comprises the following steps of 1, an apparatus connection process, 2, an apparatus parameter arrangement process, 3, a standard curve drawing process comprising preparing dimethyl trisulfide having a concentration of 99% into a standard solution having a concentration of 5mg/L, adding 40 microliters of the standard solution, 80 microliters of the standard solution, 120 microliters of the standard solution, 160 microliters of the standard solution, 200 microliters of the standard solution and 240 microliters of the standard solution respectively into 40mL of beer, putting the beer with the standard solution on a sample disk of a purge-trap automatic sampler, carrying out detection by an apparatus, and drawing a standard curve with concentration values as horizontal coordinates and peak areas as vertical coordinates, and 4, a beer sample detection process comprising putting 40ml of a beer sample to be detected into a container having an appropriate volume, adding 0.5ml of a chemical defoamer (diluted with water according to a ratio of the chemical defoamer to water of 1: 5), uniformly mixing, putting the beer sample on the sample disk of the purge-trap automatic sampler, carrying out detection analysis by the apparatus, and calculating dimethyl trisulfide content of the beer sample according to the standard curve. The method realizes detection of dimethyl trisulfide in beer and further promotes the improvement of beer quality.

The invention relates to a method for using asafetida to prepare the anti-tumor drug, which can be injection, capsule, tablet, or the like. The asafetida benzene mainly comprises a-firpene, a-terpinenes, terpin 4-alochol, pinocarveol, 2-bornyl alcohol, dimethyl disulfide, dimethyl trisulfide, N, N-thioformamide, and allyl-butyl-bisulfide. The invention uses general method to extract the asafetida benzene, as the gel resin of XinJiang asafetida or FuKang asafetida, or the like.

Dimethyl trisulfide (DMTS) antidote compositions may be used to as a cyanide poisoning antidote.

The invention is the application of resina ferulae volatile oil in preparing an anti-cancer preparation, relates to pharmaceutical uses of resina ferulae volatile oil of Chinese medicine and resina ferulae volatile oil abroad, and aims to provide a new use of the resina ferulae volatile oil. The resina ferulae volatile oil of the invention is used for preparing an anti-cancer preparation. The anti-cancer preparation can be preparations for injection, capsules, pills, tablets, granules, powders, oral liquid or other dosage forms. The resina ferulae volatile oil mainly contains: alfa-pinene, alfa-terpinenes, terpine 4-alcohol, D fenchyl alcohol, pinocarveol, 2-borneol, di-sec-butyl disulphide, sec-butyl- antiform-1-butenyl disulphide, sec-butyl- propenyl disulphide, dimethyl disulphide, dimethyl tersulfide, N.N-dimethyl thioformamide, propenyl-butyl-disulphide. The resina ferulae volatile oil is extracted from the resina ferulae by adopting the common extraction method. The resina ferulae can be oleo-gum-resin of Xinjiang resina ferulae or Fukang resina ferulae, as well as oleo-gum-resin of resina ferulae from Iran, Afghanistan, Sri Lanka, etc. The anti-cancer preparation prepared from the resina ferulae volatile oil is suitable for treating patients suffering from cancers.

The invention belongs to the technical field of tobacco production, and concretely relates to a method for determining smelly substances in paper-making reconstituted tobacco white water. The method comprises the following steps: collecting a white water sample by using a specific white water smelly substance collection device, and analyzing and detecting adsorbed substances through thermal desorption-gas chromatography-mass spectrometry; and judging that the white water is deteriorated and replacing or treating the white water when it is detected that the content of any one of dimethyl disulfide, N,N-dimethylformamide and dimethyl trisulfide in the white water exceeds a limit value. The method for determining smelly substances in the white water is sensitive and reliable, and the detection result is objective and is not affected by people's subjective feelings, so the judgment result of the quality of the white water is objective, and a good basic guarantee is provided for guiding theproduction of reconstructed tobacco leaves and ensuring the tobacco quality, thereby the method has good promotion and application meaning in the cigarette production field.

The invention discloses durian essence and a preparation method thereof. The durian essence comprises propanethiol, dimethyl disulfide, dipropyl disulfide, methyl propyl disulfide, 3-hydroxy-butanone,ethyl butyrate, ethyl acetate, ethyl hexanoate, methyl cyclopentenolone, vanillin, ethyl thioacetate, delta-decanolactone, dimethyl trisulfide, diisopropyl disulfide, 3-sulfydryl-2-methylpentanol, butyl mercaptan, hexanoic acid, onion oil, propenyl propyl disulfide, 2-methyl ethyl butyrate and propylene glycol. Sensory evaluation of the durian essence shows that the durian essence is close to natural durian aroma, coordinated and stable in fragrance and high in naturalness and characteristic performance; flavor quality can be improved obviously by using the durian essence.

The invention also relates to the use of asafetida volatile oil in preparing medicament for treating irritable bowel syndrome, which can be in the forms of injection, capsules, drop pill, tablets, granules, powder, oral liquid or other dosage forms, the asafetida volatile oil mainly contains alpha-firpene, 2-bornyl alcohol, dibutyl bisulphide, sec-butyl-trans-1-cyclobutenyl bisulphide, sec-butyl-trans-isoallyl bisulphide, dimethyl disulfide, dimethyl trisulfide, N,N-dimethyl thioformamide, and isoallyl-butyl-bisulfide.

The invention discloses a molybdenum disulfide/sulfur-doped graphene composite material and a preparation method and application thereof. The molybdenum disulfide/sulfur-doped graphene composite material comprises a carbon layer, molybdenum disulfide and sulfur-doped graphene. The preparation method comprises the following steps: mixing raw materials of molybdenum salt, graphene oxide dispersion liquid, dimethyl trisulfide and an oxygen-containing organic carbon source, then carrying out hydrothermal reaction, and carrying out heat treatment to obtain the molybdenum disulfide/sulfur-doped graphene composite material. The preparation method disclosed by the invention is simple to operate, mild in reaction condition and suitable for industrial production; and according to the molybdenum disulfide/sulfur-doped graphene composite material prepared by the preparation method, the electronic conductivity, the ionic conductivity and the specific capacity are greatly improved, and the cycling stability is good.