148results about "Component separation" patented technology

The present invention relates to chromatography ligands having improved caustic stability, e.g., ligands based on immunoglobulin-binding proteins such as, Staphylococcal protein A, as well as methods of making and using such ligands.

This invention is a method and apparatus for monitoring the concentration of carbon dioxide dissolved in water by means of conductivity. It distinguishes between the conductivity resulting from carbon dioxide and the conductivity resulting from other constituents dissolved in water. It can be used to monitor the quality of demineralized water, boiler feedwater, steam, or condensate in electric power generation and other industrial facilities. It is constructed by adding a column containing weak base anion exchange resin and a conductivity instrument to a typical cation conductivity monitor. A sample of the water to be monitored flows first through a typical cation conductivity monitor, then through a weak base anion exchange column, and then through an additional conductivity instrument. Conductivity measured at the outlet of the weak base anion exchange column will be essentially due to whatever concentration of carbon dioxide is dissolved in the sample because other dissolved constituents that affect conductivity have been essentially removed by either the cation exchange resin that is part of a typical cation conductivity monitor, or by the weak base anion exchange resin. By subtracting the value of conductivity due to carbon dioxide (at the outlet of the weak base anion exchange column) from the value of cation conductivity (at the outlet of the cation exchange column), the value of degassed cation conductivity is obtained. In the title of the invention, CWB conductivity is an abbreviation for cation—weak base conductivity.In combination with existing methods for oxidizing organic compounds dissolved in water, this invention is also a method and apparatus for monitoring the concentration of dissolved or total organic carbon in water by means of conductivity. It distinguishes between the conductivity resulting from organic carbon and the conductivity resulting from inorganic constituents dissolved in water including carbon dioxide.

The invention discloses a detection method of 2-methylimidazole and 4-methylimidazole in baked food. A mixed solution of trichloroacetic acid and methyl alcohol is added to a baked food sample to make protein, colloid and other impurities subside, supersonic extraction is conducted, a solution to be detected is obtained through centrifugation and filtering, a CAPCELL CR (1:4) chromatographic column (5 microns, 2.0 mm*150 mm) is adopted for separation, and the 2-methylimidazole and the 4-methylimidazole are subjected to qualitative and quantitative analysis through an isotope dilution ultra high performance liquid chromatography tandem mass spectrometry method. The method is free of solid phase extraction and other complex sample pre-processing procedures, three types of isomeride of the methylimidazole can be effectively separated, the ion inhibition effect is effectively lowered, sensitivity is improved, and the detection method has the advantages of being low in detection limit and good in accuracy.

A purge and trap concentrator system that includes a sparge vessel, and includes a variable gas flow valve for controlling the gas pressure in an analytic trap or the sparge vessel; a sensor that detects both a foaming sample state and a high liquid level in the sparge vessel, using one optical sensor; a control scheme that re-directs the purge gases to a second inlet of the sparge vessel during a foaming condition; a control scheme that uses a split flow to enhance the quantity of sample gases passed from an analytic trap; an electrically powered thermal energy source with a fan raising the sparge vessel temperature via thermal convection.

The invention discloses a detection method of ultra-high performance liquid chromatography-tandem mass spectrometry of ipconazole residues in maize. The detection method comprises the steps of: firstly extracting the ipconazole in the maize by utilizing an optimized QuEChERS method (purifying agents in extraction and purification steps are three kinds of PSA, C18 and GCB) with acetonitrile as an extraction solvent, and obtaining higher adding standard recovery rate; and then adopting the ultra performance liquid chromatography-tandem mass spectrometry (UPLC-ESI+-MS / MS) to detect the ipconazolein the maize. The detection method is simple, sensitive and selective, and can provide scientific techniques for safety monitoring and environmental behavior assessment of agricultural products.

The invention discloses a dense core permeability measuring device and method. The dense core permeability measuring device comprises a core holder, a standard gas mixture supply system, a confining pressure pump, a vacuum pump, a gas chromatograph and a thermostat, wherein an air inlet end of the core holder is connected with the standard gas mixture supply system through a pipeline. The method for measuring the dense core permeability of the dense core permeability measuring device comprises the following steps: S1, placing a rock sample to be measured with a length L into a rock sample cavity, and performing vacuum pumping on the rock sample and gas in the device by using the vacuum pump; and S2, starting the confining pressure pump, increasing the confining pressure of a confining pressure cavity to a required confining pressure value, and keeping the pressure constant. Through adoption of the dense core permeability measuring device and method, the problems of difficulty in measuring flow and no consideration of dispersion and slip in the process of measuring the permeability with the existing steady state method are solved.

The invention discloses a method for detecting biogenic amine in yellow wine by using a chromatographic sheet, belonging to the technical field of analysis and detection of components in the yellow wine. The method comprises the steps of carrying out derivation on a biogenic amine standard substance and a to-be-tested yellow wine sample by using a derivatization reagent, enriching the biogenic amine by using liquid-liquid extraction, carrying out sample application on a sheet plate, arranging the sheet plate in a saturate tank loaded with a certain proportion of developing solvent and unfolding; developing and observing under an ultraviolet lamp, and qualitatively detecting the target biogenic amine; and finally, quantitatively measuring the biogenic amine in the yellow wine by using a thin layer chromatograph. According to the method, the detection limit range of the biogenic amine is 0.5-5 mug / mL, the average adding standard recovery rate is 88.5-110.3 percent, the standard deviation is 3.8-12.5 percent, and at most 13 samples can be simultaneously detected on a 20*20 thin layer glass plate. Compared with other analysis methods, the method has the advantages that qualitative and quantitative analysis of the biogenic amine in the yellow wine can be realized, the operation is simple and convenient, the cost is low, and a plurality of samples can be simultaneously detected.

The invention discloses a medicine for treating cold grasserie, comprising the raw medicine by weight parts: 50 to 150 parts of Tibet pleurospermum, 50 to 150 parts of Himalayan four-o'clock root, 50 to 150 parts of caltrop, 50 to 150 parts of Polygonati Rhizoma and 50 to 150 parts of asparagus; grain diameter of the medicine is 0.1 to 100 microns. The medicine of the invention has higher effective dissolution of medicine, medicine penetration power and bioavailability, and better medicine effect. The invention further discloses a method of preparing the medicine for treating cold grasserie and special quality examination method thereof such that the quality examination method effectively controls the stability of the medicine, and also effectively identifies the specificity of pharmaceutical ingredients in medicine.

The present invention relates to novel methods and apparatus for improving the sensitivity of capillary zone electrophoresis (CZE). The invention particularly concerns devices comprising a channel that contains an in-line sol-gel column to concentrate samples being subjected to capillary zone electrophoresis, and the use of such devices to enhance the sensitivity of capillary zone electrophoresis.

The invention discloses a method for determining methamidophos in rice wine and particularly discloses a method for detecting the content of methamidophos in rice wine by utilizing gas chromatography and liquid chromatography-tandem mass spectrometry. The method comprises the following steps: (1) extraction and purification: utilizing a solid phase extraction column to extract the methamidophos in the rice wine and using ethyl acetate to elute the methamidophos adsorbed on the solid phase extraction column; (2) preparation of matrix matched standard working solution; (3) qualitative screening and quantification by utilizing gas chromatography; (4) qualitative confirmation of positive samples by using liquid chromatography-tandem mass spectrometry; (5) blank test; and (6) result calculation and representation. The method has the following beneficial effects: the pretreatment operation is simple and practical, and the recovery rate of the methamidophos is high; and by adopting the matrix matched standard working solution, the problem of matrix effect of the methamidophos on the gas chromatograph is solved, and accurate quantification is implemented.