33results about How to "Do not interfere with determination" patented technology

The invention relates to a rapid simultaneous detection method for the content of copper, zinc and iron in gold mud. A sample is dissolved by utilizing nitric acid, aqua regia, sulfuric acid and nitric-sulfuric acid; after sulfuric acid is added for smoking, a copper-zinc-iron compound is decomposed to form a corresponding oxide, HAuCl4 is decomposed to form elemental gold, and H<n-1>[AgCln]<-n+1> is decomposed to form silver chloride; after sulfuric acid is added for dissolving salts, the copper iron zinc oxide is dissolved to form sulfate; after ammonia water is added, silver-copper-zinc is transformed into corresponding ammonia complex ions, iron is transformed into iron hydroxide precipitation, and gold and iron are filtered and then separated from filtrate; after the pH value of the filtrate is adjusted by adding sulfuric acid and ammonia water, sodium chloride is added for precipitation of silver, the silver is recovered by filtering, copper in the filtrate is detected by adopting iodometry, and zinc is detected by adopting an EDTA method; and iron is detected by using a potassium dichromate method. The sample consumption is less in a detection process, precious metals can be effectively classified and recovered, the detection process is simplified, the energy consumption is reduced, and the detection efficiency is improved.

The invention provides a coumarin derivative DOCOPA as well as a preparation method and an application thereof. The English name of DOCOPA is (E)-4-(3-(7-(diethylamino)-2-oxo-2Hchromen-3-yl)-3-oxoprop-1-en-1-yl) phenylacrylate). The preparation method comprises the steps that 3-acetyl-7-diethylaminocoumarin and p-hydroxybenzaldehyde are dissolved in acetonitrile firstly, a catalytic amount of piperidine is added, and reflux is performed until a reaction is performed sufficiently; an intermediate compound is further obtained; the intermediate compound and triethylamine are dissolved in dichloromethane, acryloyl chloride is added dropwise gradually to an ice bath, room-temperature stirring is performed until a reaction is performed sufficiently, a product is subjected to column chromatography separation after reduced-pressure evaporation, and the DOCOPA is obtained. The DOCOPA is applied to distinguishing and detection of cysteine and homocysteine in a pH7.8 system and imaging of the cysteine and the homocysteine in cells. The DOCOPA shows high sensitivity and selectivity for the cysteine and the homocysteine.

The present invention provides a coumarin derivative SS-590 and a preparation method and application thereof. The coumarin derivative SS-590, whose Chinese name is (E)-1,4-diethyl-8-( 3-(4-hydroxy-3-methoxyphenyl)acryloyl)-1,2,3,4-tetrahydro-7H-pyrano[2,3-g]quinoxaline-7-one, English Named (E)‑1,4‑diethyl‑8‑(3‑(4‑hydroxy‑3‑methoxyphenyl)acryloyl)‑1,2,3,4‑tetrahydro‑7H‑pyrano[2,3‑g]quinoxalin ‑7‑one, abbreviated as SS‑590. The invention provides a method for specific detection of human serum albumin, which is based on the coumarin derivative SS-590 to detect human serum albumin in PBS. The human serum albumin labeled with the coumarin derivative SS-590 in the present invention can be used for SDS-PAGE Gel analysis. It has broad application prospects in the field of biomolecular detection.

The invention discloses a method for detection of vanillin in food, and belongs to the field of analytical chemistry or the field of food safety. With a graphene-supported cuprous oxide nanoparticle composite film modified acetylene black electrode as a working electrode, the vanillin in the food is detected by an electrochemical method. The detection method has the advantages of wide linear range, high sensitivity, low detection limit, simple operation, fast detection, low detection cost and accurate results.