52 results about "Propanethiol" patented technology

The invention relates to a detection method for metabolites in urine. The method includes (1) a step of removing impurities from a urine sample, namely a step of removing urea, sulfur and phosphorus and precipitating protein to obtain urine C; (2) a drying step, namely a step of drying the urine C to obtain urine residues D; (3) a step of oximation, namely a step of subjecting beta-carbonyl in acid or alcohol metabolites in the urine residues D to oximation by utilizing an oximation agent to obtain urine E; (4) a step of derivatization, namely a step of subjecting the urine E to derivatization with an derivatization agent to obtain a urine sample F to be detected, with the derivatization agent being an agent mixture comprising a silanization agent, a catalyst and a catalyst stabilizer, and with the catalyst stabilizer being selected from dithioerythritol, dithiothreitol, 1-propanethiol, ethanethiol and 2-mercaptoethanol; and (5) a step of detection, namely a step of detecting the urine sample F to be detected by adopting a gas chromatography-mass spectrography process. The method has advantages of a low sample using amount, simple pretreatment, short time, capability of detecting a plurality of varieties of compounds, rapid and accurate result analysis, and the like.

The invention relates to a durian flavor essence, which is composed of the following components: propanethiol; 3-hydroxy-2-butanone; hexadecanoic acid; octadecanoic acid; 2-methyl-ethyl butyrate; 2-methyl-butyric acid methyl butyrate; ethyl propionate; ethyl acetate; ethyl butyrate; propyl caproate; ethyl heptanoate; ethyl octanoate; -1,2,4-Trithiolane; Methyl 3-Methylthiopropionate; Diethyldisulfide; Propyl Trisulfide; Diallyl Sulfide; Ethanethiol; Propylene Glycol; Durian Extract. Durian flavor essence has a natural, rich and non-irritating durian flavor, which satisfies people's pursuit of flavor and expands the use range of durian; at the same time, the product is resistant to high temperature and can effectively supplement the loss of durian flavor during thermal processing, thereby enhancing the food's quality. Durian characteristic flavor.

The invention discloses a surface-enhanced Raman spectrum base material, a preparation method and an application. The base material is a three-layer composite structure, the lower layer is a single-layer film of Au@Ag nanoparticles, the middle layer is a molecular layer of propanethiol modified on the Au@Ag film, and the upper layer is a polydimethylsiloxane film with a thickness of 200-400nm. In the three-layer composite structure substrate material provided by the invention, the polydimethylsiloxane film enriches the gaseous molecules of single-ring aromatic hydrocarbons in the flowing gas through physical action, and propanethiol adsorbs the molecules to the surface of the Au@Ag film for enhancement. Therefore, it can effectively enrich, fix, and detect toxic air pollutants, especially for toluene, benzene, and xylene in the mobile gas phase, and its detection signal intensity is increased by more than 50 times. The detection of related pollutants provides a more sensitive new method.

The invention belongs to the technical field of organic sulfide detection, and particularly relates to a detection method of propanethiol. The detection method comprises the following steps that S1, AuNPs-Ag wires are prepared, wherein the AuNPs-Ag wire preparation process comprises the steps of cleaning of silver wires, corrosion of the silver wires and modification of the silver wires; S2, the propanethiol is detected, wherein the propanethiol detection process comprises the steps of extraction and surface enhanced Raman detection. According to the detection method of the propanethiol, an SPME-SERS coupling technique is adopted, the technology is simple, the complex sample pretreatment process can be reduced or even omitted, the analysis time can be shortened, the detection sensitivity is high, the limit of detection to the propanethiol can reach 10-13 M, and the detection method of the propanethiol is suitable for in-situ rapid analysis of field spots.