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41 results about "Quantitative analysis (chemistry)" patented technology

In analytical chemistry, quantitative analysis is the determination of the absolute or relative abundance (often expressed as a concentration) of one, several or all particular substance(s) present in a sample.

Analytical method of glucosamine

The invention pertains to the field of analytical chemistry, in particular to a high-performance liquid chromatography analysis method of glucosamine. The implementation of the invention completely establishes a high-efficient, rapid, accurate and precise quantitative analysis method of the glucosamine, thus building a good foundation for the application and the detection of the glucosamine in foods, health foods and drugs.
Owner:BEIJING TRADE STAR MEDICAL TECH

Dual-template molecule amino functionalized metal organic framework imprinted polymer as well as synthesis method and application thereof

ActiveCN111471147ARapid Adsorption Equilibrium CapabilityHigh sensitivityOther chemical processesGlycidyl methacrylateFunctional monomer
The invention belongs to the field of analytical chemistry, and discloses a dual-template molecule amino functionalized metal organic framework imprinted polymer. MIL-101(Cr)-NH2 is adopted as a carrier, double bonds of a functional monomer that is glycidyl methacrylate are modified to the carrier, then a precipitation polymerization reaction is carried out under the initiation of an initiator through the cross-linking action of a cross-linking agent, and the surface molecularly imprinted polymer is synthesized on the periphery of the carrier in a chemical bond grafting mode. By combining thesynthesized CPT-MIPs with an SPE technology, a solid-phase extraction small column is self-made and is applied to separation and enrichment pretreatment of zearalenone and aflatoxin in grains. Practical application shows that the disclosed polymer is high in sensitivity, high in precision, low in detection limit and quantification limit, good in recovery effect and stable in recovery rate. The method is stable and reliable, and can be used for quantitative analysis of actual samples. The CPT-MIPs column can be regenerated through elution and can be repeatedly used.
Owner:HENAN VOCATIONAL COLLEGE OF WATER CONSERVANCY ANDENVIRONMENT +1

GC-MS (Gas Chromatography-Mass Spectrometer) analysis method for quantitatively analyzing polycyclic aromatic hydrocarbon in aquatic product

The invention relates to a polycyclic aromatic hydrocarbonanalytical test method in the field of analytical chemistry, and concretely relates to a gas chromatography-mass spectrometry method applicable to quantitatively analyzing polycyclic aromatic hydrocarbon in an aquatic product. Aiming at a complex matrix of an animal-origin (aquatic product) food rich in fat, protein and macromolecular substances, the method comprises the steps of utilizing gel permeation chromatography for degreasing, then utilizing an aluminium oxide-silica gel compound chromatography purification column for effectively extracting the polycyclic aromatic hydrocarbon, utilizing gas chromatography and mass spectrometry for carrying out quantitative analysis, and building the GC-MS (Gas Chromatography-Mass Spectrometer) analysis method for quantitatively analyzing the polycyclic aromatic hydrocarbon in the aquatic product. Compared with an existing method, the method provided by the invention is higher in target compound recovery rate, beneficial for removing matrix interference, improving detection limit and reducing detection cost, and applicable to aquatic product safety evaluation, and the like.
Owner:贵阳市环境信息中心

Method for performing accurate quantitative analysis on metal elements

The invention relates to the field of analytical chemistry, in particular to a method for performing accurate quantitative analysis on metal elements by a patent technology combining a standard addition method and a differential method during accurate quantification. According to the analysis method, the standard addition method and the differential method are combined; a standard curve concentration calculation formula based on the differential method is designed; in combination with software calculation, a standard curve is established by using the standard addition method; the efficiency ofpreparing the standard curve is improved; and the interference caused by the matrix effect is effectively reduced, so that accurate quantification of the metal elements is realized. According to themethod, the calculated amount of preparing the standard curve by using the traditional standard addition method is greatly reduced, so that the quantitative analysis precision and speed of the harmfulmetal elements are improved; the standard addition method can replace the standard curve method (an external standard method); the accurate quantification method for the metal elements can be appliedto the detection of batch samples; and the method serves as a method for efficiently measuring the element concentration when a used instrument measures a special device without using the standard addition method.
Owner:李蒙

Detection method for polychlorinated naphthalene content in electronic and electrical product rubber part

The present invention discloses a detection method for a polychlorinated naphthalene content in an electronic and electrical product rubber part. The method comprises the following steps: (1) crushing an electronic and electrical rubber sample to obtain a homogeneous sample; (2) adding heavy metal powder to the crushed sample, adopting an accelerated solvent extraction method to completely extract the polychlorinated naphthalene in the sample, taking the extracting solution; (3) completely transferring the extracting solution to a solid phase extraction column, adopting a mixed solvent to carry out elution, and collecting and concentrating the eluent to obtain the purified extracting solution; (4) preparing a mixed standard solution, loading the purified extracting solution and the prepared mixed standard solution on a gas chromatograph to carry out detection, adopting an electron capture detector to collect the signal, adopting a chemistry station to carry out data processing and quantitative analysis to obtain the polychlorinated naphthalene content in the electronic and electrical product rubber part. With the method of the present invention, the impurities with interference in the rubber can be effectively removed, the polychlorinated naphthalene can be completely extracted, the purification degree is high, the detection sensitivity is high and the detection cost is low.
Owner:广东德威检验认证有限公司

Preparation method and application of a ratiometric fluorescent probe for detecting hydrazine

The invention relates to a preparation method and application of a ratiometric fluorescent probe for detecting hydrazine. The preparation comprises the steps that phosphorus oxychloride is dissolved in dichloromethane, the mixture is slowly dropped into N,N-dimethylformamide, and after the dropwise addition is finished, cyclohexanone is added for reaction so as to obtain a compound 1; then, benzoindoles and iodoethane are dissolved in acetonitrile for heating and refluxing reaction so as to obtain a compound 2; the compound 1 and the compound 2 are subjected to heating and refluxing by takingmethylbenzene and n-butyl alcohol as solvents so as to obtain a fluorescent probe compound 3; the compound 3 is dissolved in anhydrous N,N-dimethylformamide, and sodium acetate is added for reaction under the protection condition of nitrogen so as to generate a compound 4; and the compound 4 is dissolved in anhydrous dichloromethane containing acetyl chloride, triethylamine is added for reaction for 4 hours at normal temperature under the protection of the nitrogen so as to generate the probe Ben-Cy1. ccording to the preparation method and application of the ratiometric fluorescent probe, theprobe works in a near-infrared region, is suitable for qualitative and quantitative analysis, low biotoxicity and high selectivity in biological samples and can be applied to the related fields of analytical chemistry, life organic analytical chemistry and the like.
Owner:QUFU NORMAL UNIV

Method for using HS-GC (headspace gas chromatography) external standard method to measure residual acrylic acid in acrylic polymer

The invention belongs to the technical field of analytical chemistry, and particularly relates to a method for using an HS-GC (headspace gas chromatography) external standard method to measure the residual acrylic acid in a acrylic polymer. A headspace gas chromatographic instrument is adopted to conduct detection and external standard method quantitative analysis, wherein the gas chromatographicinstrument is an Agilent gas chromatography 7890B, the gas chromatography analysis conditions are that chromatographic columns are chromatographic columns with DB-WAX or polarity being equivalent, thelength of the columns is 30 m, the inner diameter of the columns is 320 microns, the initial column temperature is 130 DEG C, the temperature is maintained for 2 minutes, then the temperature is risen to be 190 DEG C at the ratio of 20 DEG C / min, the temperature is maintained for 12 minutes, and the flow rate of carrier gas is 1 ml / min. The method is high in precision, good in reproducibility, high in accuracy and good in repeatability, can achieve direct detection of samples, avoids influences of raw materials and by-products to the product peak, shortens the analysis time, is simple and practical, and convenient and reliable.
Owner:ZIBO LURUI FINE CHEM CO LTD

Method for analyzing residual solvent in enoxaparin sodium

The invention discloses a method for analyzing a residual solvent in enoxaparin sodium. The method specifically comprises the following steps: S1, taking a capillary column, setting carrier gas of thecapillary column to be nitrogen, setting the column flow rate of the capillary column to be 3.0 ml/min, the hydrogen flow rate to be 35.0 ml/min, the air flow to be 350.0 ml/min, the tail blowing flow to be 30ml/min, the column temperature of the capillary column to be 120 DEG C, the temperature of a sample inlet to be 200 DEG C, and the split ratio to be 20: 1, using a hydrogen flame ionizationdetector as detection equipment, and setting the temperature of the detector to be 250 DEG C; and S2, carrying out sample introduction of a sample solution in a headspace sample introduction mode, andsetting the equilibrium temperature of a headspace sample injector to be 85 DEG C. The invention relates to the technical field of analytical chemistry. According to the method for analyzing the residual solvent in the enoxaparin sodium, a simple gas chromatography determination method is adopted, the residual quantity level of methanol, ethanol and dichloromethane in the enoxaparin sodium is accurately analyzed, and qualitative and quantitative analysis can be more rapidly and accurately carried out on organic solvent residues in the enoxaparin sodium.
Owner:HUBEI YINUORUI BIOLOGICAL PHARMA

Tricyclic compound as well as preparation method and application thereof

The invention belongs to the field of medical chemistry and particularly relates to a tricyclic compound, a preparation method thereof and application thereof as a reference substance in qualitative and / or quantitative analysis of related impurities in the research of the quality of a raw material drug of N-(2-((2-(dimethylamino)ethyl)(methyl)amino)-4-methoxy-5-((4-(6,7,8,9-tetrahydropyrido [1,2-a] indol-10-yl) pyrimidine-2-yl) amino) phenyl)allylamide methanesulfonate.
Owner:NANJING SANHOME PHARMACEUTICAL CO LTD

A quantitative analysis of metalloporphyrin MOFs material co 2 /ch 4 method of separation efficiency

The invention discloses a method for quantitatively analyzing efficiency of metalloporphyrin MOFs materials in separating CO2 / CH4. According to the method of the invention, the efficiency of the metalloporphyrin MOFs materials in separating CO2 / CH4 is quantitatively analyzed based on density functional theory calculation of auantum chemistry and Monte Carlo molecular simulation. By determining interaction energy between probe molecules and different metalloporphyrin ligands and adsorption heat, interaction between CO2 and metalloporphyrin MOFs materials is quantitatively analyzed, and finally calculation of selectivity in adsorption of CO2 / CH4 is used to characterize efficiency and features of different metalloporphyrin MOFs materials in separating CO2 / CH4. The method comprises steps of: construction of a cluster model; structural optimization of a stable structure and calculation of partial charges; calculation of a CO2 / CH4 separation coefficient; calculation of adsorption energy and adsorption heat; and analysis and characterization of efficiency in separating CO2 / CH4. According to the method of the invention, efficiency of metalloporphyrin MOFs materials in separating CO2 / CH4 can be quantitatively characterized without any actual experiment. The method of the invention can be further extended for analysis of efficiency of other porous molecular sieves of known crystal structures and MOFs materials in separating CO2 / CH4.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)

Detection method for polychlorinated naphthalene content in electronic and electrical product rubber part

The present invention discloses a detection method for a polychlorinated naphthalene content in an electronic and electrical product rubber part. The method comprises the following steps: (1) crushing an electronic and electrical rubber sample to obtain a homogeneous sample; (2) adding heavy metal powder to the crushed sample, adopting an accelerated solvent extraction method to completely extract the polychlorinated naphthalene in the sample, taking the extracting solution; (3) completely transferring the extracting solution to a solid phase extraction column, adopting a mixed solvent to carry out elution, and collecting and concentrating the eluent to obtain the purified extracting solution; (4) preparing a mixed standard solution, loading the purified extracting solution and the prepared mixed standard solution on a gas chromatograph to carry out detection, adopting an electron capture detector to collect the signal, adopting a chemistry station to carry out data processing and quantitative analysis to obtain the polychlorinated naphthalene content in the electronic and electrical product rubber part. With the method of the present invention, the impurities with interference in the rubber can be effectively removed, the polychlorinated naphthalene can be completely extracted, the purification degree is high, the detection sensitivity is high and the detection cost is low.
Owner:广东德威检验认证有限公司
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