69results about How to "Determination of content" patented technology

The invention relates to a method for determining the content of silicon dioxide in rubber through a spectrophotometer. The method comprises the steps as follows: subjecting a rubber sample to ashing treatment; adding potassium hydroxide into the ashed sample for treatment so as to convert silicon in the sample into soluble silicate; then reacting a silicon-containing solution with ammonium molybdate in a hydrochloric acid medium; then using ammonium ferrous sulfate for reducing a reaction product in the last step to silicon molybdenum blue, and measuring the absorbance of the silicon molybdenum blue in a position with a set wavelength of 700-880 nm. The method is applied to all rubber except silicon-containing rubber.

The invention provides a method of detecting casein in dairy products by using tetraphenylethylene derivatives, and particularly provides an application of the tetraphenylethylene derivatives in preparing products used for detecting the casein in the dairy products. The structural formula of the tetraphenylethylene derivatives is shown as the structural formula I. The method includes preparing a standard curve; precipitating the casein in the dairy products; dissolving the precipitated casein; mixing the dissolved casein with a solution of the tetraphenylethylene derivatives and measuring the fluorescence value; and comparing the measured fluorescence value with the standard curve to obtain the content of the casein. According to the method, the tetraphenylethylene derivatives capable of aggregation and luminescence are adopted. When encountering the casein in the dairy products, the tetraphenylethylene derivatives can enter into the protein structure to form an aggregation state and emit fluorescence to avoid interference, and therefore the content of the casein in the dairy products, such as milk and milk powder can be effectively measured. Formula (I).

The invention belongs to the field of medical domestic fungus analysis and detection and relates to a method for simultaneous detection of guanosine, uridine and adenosine in Morchella esculenta by HPLC. The method comprises adding water into Morchella esculenta powder, carrying out constant temperature ultrasonic extraction, carrying out full shaking, taking the supernatant, filtering the supernatant through a water filter head, carrying out standing to obtain a sample solution to be detected, preparing a nucleoside reference solution and detecting nucleoside components in Morchella esculenta through HPLC. The method for detecting nucleoside components in Morchella esculenta has high stability, good repeatability and a good precision, produces a reliable and convenient result and can provide scientific basis for quality control of Morchella esculenta.

The invention relates to a material sensitive to sulfide and hydrogen peroxide as well as a preparation method and application thereof in detecting sulphions and the hydrogen peroxide in a solution and sulfureted hydrogen in a gas phase, belonging to the field of composite materials. The material has a PbO/SiO2 structure, wherein the mole ratio of Pb and Si is 1:6.67-100. The material sensitive to the sulfide and the hydrogen peroxide can fast and conveniently measure a minute amount of the sulphions and the sulfureted hydrogen and can also carry out oxidation treatment on a specific oxidant and then repeatedly use the specific oxidant or use the specific oxidant to measure the hydrogen peroxide after the measurement, thereby being more economic; and in addition, the invention has the advantages of convenient use in measuring the sulphions and the sulfureted hydrogen, low cost, high sensitivity, fast response and very good market prospect.

The invention discloses a high performance liquid chromatography (HPLA) method for measuring content of hypocrellin A. The conditions of the liquid chromatography are as follows: octadecylsilane chemically bonded silica is used as a filler for a chromatographic column, and a mobile phase is a mixed solvent consisting of methanol and dilute phosphoric acid (or dilute formic acid, dilute acetic acid and dilute sulfuric acid), wherein the volume ratio of the methanol and the dilute phosphoric acid (or dilute formic acid, dilute acetic acid and dilute sulfuric acid) is 80:20-70:30, and the detection wavelength is 462 nm. The invention overcomes the defects of traditional analysis method and can be directly applied to the quantitative analysis of hypocrellin A in traditional Chinese medicine and preparation including the hypocrellin A. The method has the technical characteristics of good separation effect, precise measurement, sensitivity, strong specificity, fast measurement and the like. The absorption peak of the hypocrellin A in the medicine and preparation including the hypocrellin A can fully flow out the chromatographic column within 30 minutes, and the analysis work is finished.

The invention discloses a method for measuring the contents of phosphorus, boron and arsenic impurities in silicon tetrafluoride gas. The method is characterized by comprising the following steps thata NaOH absorption solution is prepared; SiF4 which is purified after being absorbed by concentrated sulfuric acid, absorbed by concentrated sulfuric acid containing zeolite, absorbed by concentratedsulfuric acid and absorbed by concentrated sulfuric acid in sequence is introduced into an absorption bottle containing the NaOH absorption solution; the absorbed amount of the SiF4 gas is controlledto obtain a test sample, and the weight of the absorbed SiF4 gas is measured; the contents of phosphorus, boron and arsenic in the gas are analyzed by using the inductively coupled plasma atomic emission spectrometry.

The invention relates to a Chinese medicine combination with a health protection function, comprising the following steps of firstly, decocting honeysuckles with water for 1-3 times to prepare a honeysuckle extractive; secondly, decocting scutellaria 1-3 times with water, combining decocted fluids and filtering, regulating pH of filtrate to 2-4, standing, leaching precipitations, washing with 40-70 percent ethanol and concentrating to prepare a scutellaria extractive; thirdly, respectively detecting contents of effective compositions in the honeysuckle extractive and the scutellaria extractive by using a liquid chromatography; and fourthly, preparing a yinhuang combination in a proportion, drying the yinhuang combination according to the needs of preparation forms, adding proper amount of auxiliary materials, and preparing into various preparation forms which can be clinically accepted through a conventional preparation method. The method solves the problem of difficult drying of a honeysuckle extractive thick paste, enhances the production efficiency and the utilization ratio of scutellaria so as to enable the concentration process to be easy to carry out, saves the energy and has remarkable curative effect by applying a yinhuang preparation including a yinhuang buccal tablet prepared by the method.

The invention relates to the technical field of drug detection and particularly relates to a detection method for related substances in a dexmedetomidine hydrochloride raw material or preparation. According to the method, dexmedetomidine hydrochloride and other inactive substances can be separated well and content of impurities can be accurately measured. According to the detection method providedby the invention, good propulsion effect for uniform establishment of quality control and standard of a product can be provided. According to the method, a high-performance liquid chromatography is employed; a detection wavelength is 215-220nm; a column temperature is 30-40 degrees centigrade; octadecyl silane bonded silica gel is taken as filler; acetonitrile-phosphate buffer is taken as mobilephase A; acetonitrile is taken as mobile phase B; trapping small columns are mounted between a gradient mixer and a sample injector; and gradient elution is carried out according to parameters set bythe method. According to the method, through adoption of the specific mobile phases and gradient elution parameters, the problem that the prior art is poor in separation degree and chromatographic column tolerance and high in cost is avoided.

The invention relates to a method for measuring the conductivity of inorganic binder sand. The method comprises the steps of adding distilled water into the inorganic binder sand, sequentially carrying out vibration and centrifugal separation, extracting supernate, and representing the amount of an inorganic binder in the inorganic binder sand by virtue of a method for detecting the conductivity of the supernate by virtue of a conductivity instrument. The method has the beneficial effects that the operation process is strict, simple and convenient; the stability is high; the numerical value ishigh, the repeatability is high, and meanwhile, the troubles in the preparation and use of a solution are reduced; and a chemical reagent is not used in the whole measurement process, and only wateris adopted, so that the method is relatively environment-friendly and efficient, and the cost is saved.

The invention provides a senegenin derivative, as well as a preparation method and application thereof. In the senegenin derivative, the molecular formula is C44H52ClO8, and the name is 2,3-diphenyl formyloxy-senegenin. The preparation method comprises the following steps of: adding senegenin, dichloromethane, pyridine, benzoyl chloride and 4-dimethylamino pyridine into a reactor, stirring, and performing an ice water bath reaction; performing silicagel column chromatography and gel column chromatography to the prepared product; separating through semi-preparative high-efficiency liquid-phase chromatography; and collecting eluent of a corresponding chromatographic peak; concentrating in reduced pressure until the eluent is dry to obtain the senegenin derivative pure product with purity of over 98 percent. The pure product serving as a chemical reference substance can be used in content measurement of senegenin, and the ultraviolet maximum absorption wavelength of the senegenin derivative is 230nm and compared with 210nm of senegenin, so that the problems of specificity and stability in HPLC (High Performance Liquid Chromatography)-UV (ultraviolet) detection are solved. Therefore, the senegenin derivative, as well as the preparation method and application have practical values in quality control of the thinleaf milkwort rootbark medicinal material and thinleaf milkwort rootbark set prescription preparation.

The invention belongs to the field of pesticide detection, and discloses a simple electrochemiluminescence detection method of glyphosate pesticide, and especially relates to preparation and applications of a carbon nitride-based glyphosate electrochemiluminescence sensor. According to a preparation method, graphene carbon nitride (g-C3N4) is used for modifying glassy carbon electrode loaded with Ag<+> on the surface; Ag<+> is released from the g-C3N4 modified electrode surface under the complexing action of glyphosate in a solution with Ag<+> on the surface of the electrode, recovery of electroluminescent signals is realized, and detection of glyphosate is realized via detecting the electroluminescent signals.

The invention is about the measuring method of Inorganic Phosphates and its diagnosis reagent box. Producing hydroperoxide by reacting pyruvate oxidase with pyruvate under the activation ofInorganic Phosphates in the sample of plasma or serum and so on, and producing acetaldehydeby reacting hydroperoxide with alcohol under the existence of hydroperoxide enzyme, and then transferring oxidized coenzyme to reduced coenzyme by reacting acetaldehyde and aldehyde dehydrogenase, testing the ascending range of dominant wave-length34nm absorbance before and after the reaction and finally measuring the content of Inorganic Phosphates. This method has high specificity and would not be contaminated by material of internal and exogenous sources, and the result is precise and accurate. Diving the diagnosis reagent box into double-dose or three-dose can reduces the cross interaction of each element, keeps the stability of the reagent and deposits chronically. Using this method can realize the fast testing in common ultraviolet/ visible light analyzer or semiautomatic/automatic analyzer and doesní»t require special or additional apparatus, so the cost is low. Thus, this method can be easily promoted and applied in the whole industry.

The invention specifically relates to a method for quantitatively determining the content of cuprous oxide in the corrosion products of copper, belonging to the technical field of inorganic chemical analysis. The method comprises the following steps: dissolving cuprous oxide on a to-be-detected sample in ammonia water under an anoxic condition, adding a ferric sulfate solution acidified by sulfuric acid after dissolving, and allowing ferric sulfate to oxidize cuprous ions into copper ion and to be reduced into ferrous sulfate; and titrating ferrous sulfate by using a standard potassium permanganate solution in an aerobic environment and calculating the content of cuprous oxide according to the content of ferrous sulfate. The method provided by the invention can quantitatively determine the content of cuprous oxide and has measurement error of +/- 3% or below. The method is applicable to research on the corrosion mechanism of copper.

The invention provides a method for detecting a deep jet-flow sedimentary deposit based on natural gamma-ray spectrum logging. The method comprises the steps of 1, selecting a drilled well or a drilled hole; 2, calculating the contents of uranium and thorium elements in the stratum; 3, analyzing the contents of uranium and thorium elements, and screening out a high uranium layer section; 4, identifying the vertical distribution of the jet-flow sedimentary deposit; 5, determining the thickness, continuity and uniformity of the jet-flow sedimentary deposit; 6, determining the depth position, the distribution layer position and the thickness change of the jet-flow sedimentary deposit; and 7, determining the spatial form and the metallogenic law of the jet-flow sedimentary deposit, and predicting a favorable exploration area. According to the method, the uranium content and the thorium content in the stratum are obtained by utilizing the characteristics of uranium enrichment and high uranium-thorium ratio of the SEXDEX type ore deposit and combining natural gamma-ray spectrum logging analyzing, and a continuous longitudinal section of the uranium content and the uranium-thorium ratio is established; and the method provided by the invention is a method for rapidly, accurately and economically screening out favorable SEDEX ore deposit exploration targets in the deep stratum.

The invention is about the measuring method of inorganic Phosphates and its diagnosis reagent box. Producing hydroperoxide by reacting pyruvate oxidase with pyruvate under the existence of Inorganic Phosphates , then causing enzyme-coupled reaction with peroxidase and oxidating the colorless reduced chromogen combination to quinoneimine chromogen or indamide chromogen dyer with color, testing the variation of dominant wave-length 400ú¡600nm absorbance during the reaction and finally measuring the content of Inorganic Phosphates . This method has high specificity and would not be contaminated by material of internal and exogenous sources, and the result is precise and accurate. Diving the diagnosis reagent box into double-dose or three-dose can reduces the cross interaction of each element, keeps the stability of the reagent and deposits chronically. Using this method can realize the fast testing in common ultraviolet/ visible light analyzer or semiautomatic/automatic analyzer and doesní»t require special or additional apparatus, so the cost is low. Thus, this method can be easily promoted and applied in the whole industry.

The invention is about the measuring method of Inorganic Phosphates and its diagnosis reagent box. Producing hypoxanthine by reacting nucleoside phosphorylase with carnine under the existence of Inorganic Phosphates in the sample of plasma, serum and so on, then producing urate and hydroperoxide by reactinghypoxanthine withxanthine oxidase, and then reacting bimolecular hydroperoxide with peroxidaseand oxidating the colorless reduced chromogen combination to quinoneimine chromogen or indamide chromogen dyer with color, testing the variation of dominant wave-length400ú¡600nmabsorbance during the reaction and finally measuring the content of Inorganic Phosphates . This method has high specificity and would not be contaminated by material of internal and exogenous sources, and the result is precise and accurate. Using this method can realize the fast testing in common ultraviolet/ visible light analyzer or semiautomatic/automatic analyzer and doesní»t require special or additional apparatus, so the cost is low. Thus, this method can be easily promoted and applied in the whole industry.

The invention discloses a fluorescent probe for detecting sulfur dioxide, and belongs to the technical field of analytical chemistry. The probe is prepared from prepared novel coumarin dye and 4-diethylamino salicylaldehyde in concentrated sulfuric acid at 90 DEG C. The preparation raw materials of the fluorescent probe are easy to obtain, the synthesis method is simple, and the fluorescent probehas the advantages of high selectivity, high sensitivity, low detection limit and the like for sulfur dioxide. The fluorescent probe can be applied to detection of sulfur dioxide in cells.

The invention is about the measuring method of Inorganic Phosphates and its diagnosis reagent box. Producing carbon dioxide by reacting pyruvate oxidase with pyruvate under the activation ofInorganic Phosphates in the sample of plasma or serum and so on, and producing oxaloacetic acid by reacting carbon dioxide and phosphoenolpyruvate under the existence of phosphoenolpyruvate carboxylase, and then transferring oxidized coenzyme to reduced coenzyme by reacting oxaloacetic acid and malic acid dehydrogenase. Testing the descending range of dominant wave-length340nm absorbance and finally measuring the content of Inorganic Phosphates. This method has high specificity and would not be contaminated by material of internal and exogenous sources, and the result is precise and accurate. Diving the diagnosis reagent box into double-dose or three-dose can reduces the cross interaction of each element, keeps the stability of the reagent and deposits chronically. Using this method can realize the fast testing in common ultraviolet/ visible light analyzer or semiautomatic/automatic analyzer and doesní»t require special or additional apparatus, so the cost is low. Thus, this method can be easily promoted and applied in the whole industry.

The invention relates to a method for detecting related substances in a Tolterodine tartrate raw material or preparation. The method employs high performance liquid chromatography (HPLC) for diction, adopts chromatographic column filled with cyano bonds and silica gel as an immobile phase, and takes a mixed solution of a phosphate buffer and acetonitrile. And the detection wavelength is 215nm. The method of the invention can effectively separate Tolterodine tartrate and other impurities well, detects impurities comprehensively within 215nm, and accurately determines the content of other impurities. Also, the method provided in the invention has the characteristics of simple operation, high sensitivity, accurate and reliable result as well as strong specificity.

The invention discloses a mechanism for extracting dust in desulfurized flue gas, a dust measuring device and method. The dust extracting mechanism comprises a flue gas mixing box, a flue gas conveying and measuring assembly, a cooling assembly, a cleaning assembly and a drying assembly, wherein the flue gas conveying and measuring assembly is installed on the side face of the flue gas mixing boxand used for conveying flue gas to the flue gas mixing box and measuring the flow of the conveyed flue gas; the cooling assembly is installed on the side, away from the flue gas conveying and measuring assembly, of the flue gas mixing box and used for cooling flue gas in the flue gas mixing box to form dew; the cleaning assembly is communicated with the flue gas mixing box and used for cleaning dew dripped out of the flue gas mixing box to form sewage; and the drying assembly is used for filtering and drying the sewage to obtain dust. The mechanism has the beneficial effects that the minimum amount of dust brought out by the flue gas can be measured, whether the flue gas contains the dust or not can be verified, and the content of the dust in the flue gas can be measured.