49results about How to "Optimize separation conditions" patented technology

The invention discloses a method for measuring contents of methanol, sec-butyl alcohol, sesamol and musk xylene in an additive for cigarettes. The method comprises the following steps of: preparing an internal standard solution, preparing a standard solution, preparing a sample solution, and performing quantitative and qualitative analysis on the methanol, sec-butyl alcohol, sesamol and musk xylene by employing gas chromatograph-mass spectrometer (GC / MS). By utilizing the GC / MS, the contents of methanol, sec-butyl alcohol, sesamol and musk xylene in the additive for the cigarettes can be directly measured, and the method has the advantages of easiness and convenience in operation, high rapidness, high accuracy, high sensitivity and high repeatability.

The invention discloses a method for detecting seven prohibited compounds in flavors and fragrances. The seven prohibited compounds are methanol, sec-butyl alcohol, safrole, imidazole, coumarin, musk xylene and sesamol. The detection method can accurately and rapidly detect the contents of the seven prohibited compounds in flavors and fragrances, is suitable for quality safety control of fragrance raw liquid and auxiliary solvents in the industries such as food, daily-use chemical industry, tobacco and pharmacy, and the has the characteristics of simple operation, rapidness, accuracy, good repeatability, high sensitivity and the like.

The invention relates to a method for separating polysaccharide and protein by using a choline ionic liquid two-phase aqueous system, belongs to the technical field of bioactive substance separation and purification, and particularly relates to application of the ionic liquid two-phase aqueous system composed of choline chloride [Ch]Cl and inorganic phosphate K3PO4 in selective separation of fungal polysaccharide and protein. The method is mainly characterized by comprising the following steps: after degreasing crushed fungi mycelium or sporocarp with petroleum ether, using hot water with the temperature of 95 DEG C for reflux extraction for 8 hours, centrifuging, concentrating, dialyzing, and freeze-drying, so as to obtain a fungus aqueous extract; carrying out extraction separation by using the ionic liquid two-phase aqueous system composed of choline chloride[Ch]C1 and inorganic phosphate K3P04; carrying out lower-layer inorganic salt phase dialysis, ethanol precipitation and freeze-drying so as to obtain fungal polysaccharide; carrying out extraction on an upper-layer ionic liquid phase by using dichloromethane, concentrating and recycling an ionic liquid. The ionic liquid two-phase aqueous system provided by the invention is suitable for industrial production of active polysaccharides, has the effects of being green, quick and efficient, the ionic liquid can be recycled for use, the production cost is lowered, and the ionic liquid two-phase aqueous system can be commonly used for the selective separation of various fungal polysaccharide and protein.

The invention provides a method for detecting retinol and a precursor thereof. The method comprises the following steps: 1, extracting retinol and / or the precursor thereof from a sample; 2, separating retinol and / or the precursor thereof through HPLC; and 3, carrying out MS / MS quantitative detection, wherein the sample is a dry blood spot card sample, and an extractant adopted in the invention is trichloromethane. A filter paper card is adopted as a carrier to adsorb a tiny amount of blood in order to make the dry blood stop card, so the difficulties of much blood induced by venous blood collection, bad population compliance, death induced by animal model blood drawing, and inconvenient long-distance conveying of samples in previous serum collection and detection process are overcome. The method has the advantages of small matrix effect, good linear relation of analysis in the concentration range of a standard curve, low detection limit, high sensitivity, good accuracy and high precision, is related with the result of detection of retinol in serum through HPLC, allows the contents of the retinol and the precursor thereof in the sample to be simultaneously and synchronously analyzed, and provides a method for comprehensive assessment of the in vivo retinol level.

The invention discloses a method for separating and purifying cordycepin by utilizing a high-speed counter-current chromatography. The method is characterized by comprising the following steps: 1, preparing a cordycepin sample solution; and 2, preparing a two-phase solvent system which can be used for the high-speed counter-current chromatography and has a two-phase distribution coefficient K value ranging from 0.5 to 1.0 according to the physicochemical property of the cordycepin, then carrying out high-speed counter-current chromatography separation and purification on the cordycepin sample solution obtained in the step 1 by using the two-phase solvent system, and collecting a flowing-out mobile phase solution or immobile phase solution, so as to obtain a cordycepin solution pure product. In the invention, the two-phase solvent system having the two-phase distribution coefficient K value ranging from 0.5 to1.0 has excellent good separation effect on the cordycepin, and the peak separation effect in the high-speed counter-current chromatography is extremely good, thus the purity of the cordycepin pure product obtained by separation is extremely high and can reach above 98%.

Floating circulation oil collector and circulation separation method are suitable for on-site treatment of oily sewage in oil exploration, collection, storage and transportation, processing and other petrochemical processes; pre-treatment of oily sewage treatment plants, replacing oil separation, air flotation and other mixing with different specific gravity Separation and removal of liquids. The oil collection tank is connected with the ring pipe, and the lower part is provided with a support rod; the oil collection bucket in the oil collection ring at the upper part of the oil collection tank is connected with the oil outlet pipe; the water outlet of the oil collection tank at the lower part of the oil collection tank is connected with the peripheral pumping equipment; the lower part of the container is provided with a water outlet pipe; An oil collection tank buoy is arranged on the outer surface of the oil collection tank; a buoy, a ring pipe buoy and a water injection pipe are arranged on the ring pipe; the water inlet pipe system is connected with the ring pipe; the ring pipe matches the pulley on the guide rod. The circulation separation method is: the oily sewage enters the water inlet pipe system from the water inlet, so that the floating oil on the liquid surface flows to the oil collection tank and the oil collection bucket, and is discharged through the oil outlet pipe; the separated clean water is discharged from the water outlet pipe; the water outlet and The peripheral pumping equipment is connected to form a circulation loop and reciprocate. It has the advantages of saving energy and reducing land occupation.

The invention relates to a method for predicting the retention time of gas phase chromatography second-order programming temperature-rise chromatographic peak, belonging to the technical field of analytical chemistry. The method predicts retention time values under other second-order programming temperature-rise gas phase chromatography conditions by the retention time value of target components in a sample to be detected under two preset second-order programming temperature-rise gas phase chromatography conditions. The method has the advantages that the predicted value of the chromatographic peak retention time has high accuracy, the workload is small, and the method provides a feasible approach for selecting optimum separation conditions of gas chromatography, and the like.

The invention relates to a method for rapidly separating lentinan and belongs to the technical field of biomacromolecule separation and purification, in particular to a method for rapidly separating lentinan using an ionic liquid two-aqueous phase system composed of [Bmim]Cl / K3PO4. The method is green, highly-efficient and rapid, is suitable for large-scale industrial production of active polysaccharides, reduces the production cost by recycling the ionic liquid, and can be widely applied to the separation and purification of fungal polysaccharides.

The invention belongs to the field of analytical chemistry and the technical field of pesticide residue detection, particularly provides a method for separating and measuring enantiomers of chiral pesticides metalaxyl and dimethomorph with UPCC-MS / MS (ultraperformance convergence chromatography-tandem mass spectrometry) and relates to a separating and quantitating method for raceme of multiple chiral pesticides. According to the method, metalaxyl and dimethomorph in tobacco and dried fruits are extracted with a QuEChERS method, and the enantiomers of the two chiral pesticides metalaxyl and dimethomorph are synchronously detected through combination of chiral stationary phase of bonded phase chromatography and triple quadrupole MS. The convergence chromatography is adopted for the first time for rapid chiral separation of metalaxyl and dimethomorph, and sensitivity is high; supercritical CO2 is taken as a moving phase, so that a large quantity of organic solvents are saved, and the method is environmentally friendly.

The invention relates to a method for detecting yeast beta-glucan in milk or a milk product. The method comprises 1, pretreatment: carrying out enzymolysis on milk or a milk product through a neutral protease or an alkaline protease, carrying out centrifugation on the enzymolysis product, cleaning the precipitates obtained through centrifugation through pure water or deionized water, adding an monobasic acid into the precipitates and carrying out heating hydrolysis, and 2, analysis: determining glucose content of the pretreatment product through ion chromatography and calculating yeast beta-glucan content of the milk or milk product.

The invention discloses a method for separating fungus extracellular polysaccharides by utilizing a three-phase system, belongs to the technical field of bioactive substance separation and purification, and particularly relates to selective separation of fungus extracellular polysaccharides by utilizing a system consisting of tert-butanol and an inorganic salt that is ammonium sulfate. The methodmainly includes steps of subjecting a fungus fermentation solution to treatment with ultrasonic waves having a sound energy density of 15 W / cm<3> for 10 min; adding the ammonium sulfate and the tert-butanol; performing vibration in a water bath at a constant temperature of 35 DEG C for 30 min; performing centrifugal separation; subjecting a lower inorganic salt phase to dialysis, concentration andspray drying to obtain fungus extracellular polysaccharide powder; and subjecting an upper organic phase to vacuum rotary evaporation to recover the tert-butanol. The three-phase system is suitable for industrial production of the fungus extracellular polysaccharides, and has rapid, efficient and environmentally friendly effects. The organic phase tert-butanol can be recycled and reutilized so that the method is safe, convenient and low in pollution, the production cost is reduced. The method can be widely applied for extracellular polysaccharide separation of various fungus fermentation solutions.

The invention discloses a component controllable two-stage condensation Rankine cycle power generation system utilizing LNG cold energy, and belongs to the field of liquefied natural gas cold energy power generation. The system comprises a first sea water pump, a second sea water pump, a first working medium pump, a second working medium pump, a mixer, a working medium evaporator, a membrane separation device, a first expansion machine, a second expansion machine, an LNG pump, a first-stage condenser, a second-stage condenser and a reheater. According to the system, step-by-step utilization ofthe LNG cold energy is realized; and the proportion of mixed working mediums in the two condensers can be regulated and controlled by the additionally arranged membrane separation device, the temperature matching degree in the heat exchange process can be further improved, the irreversible loss in the LNG cold energy recovery process can be reduced, the power generation efficiency is improved, meanwhile, the flexible applicability of the system under different working conditions is also improved, and therefore, the system can be widely applied to the field of LNG cold energy power generation.

The invention belongs to the field of analytical chemistry and the technical field of determination of pesticide residues, particularly relates to a method for splitting and measuring enantiomer of achiral pesticide benalaxyl through the ultra-performance convergence chromatography-tandem mass-spectrometric technique, and relates to a method for splitting and quantifying raceme of the chiral pesticide. The method uses a QuEChERs method to extract benalaxyl in tobacco, cereals and dried fruits, and the enantiomer of the chiral pesticide benalaxyl is detected through the combination of convergence chromatographic chiral stationary phase and triple quadrupole tandem mass spectrum. The convergence chromatography is used for the first time to rapidly chirally separate the benalaxyl, and the sensitivity is high. The supercritical CO2 is taken as a mobile phase, a large number of organic solvents are saved in use, and the method is green and environmentally friendly.

The invention relates to a method for detecting the effect of PQQ on lactic acid by combining HPLC with UPLC-MS and belongs to the technical field of bioanalysis. The method provided by the invention adopts an UPLC method for studying reaction between PQQ and lactic acid, and separation conditions are optimized, so that separation of the PQQ from multiple reaction products is achieved; and qualitative analysis is carried out on the reaction products by adopting UPLC-MS. The method provided by the invention firstly studies the reaction behavior of the PQQ and the lactic acid, three products are found in reaction liquid, and quasi-molecular ions [M+H]<+> are 403, 475 and 547 respectively. Esterification reaction is respectively carried out on the PQQ as well as monomolecular lactic acid, dimolecular lactic acid and trimolecular lactic acid, and products PQQLa1, PQQLa2 and PQQLa3 are obtained respectively. Peak areas of products obtained by different reaction times show that the PQQLa1 exists mainly, and products after esterification enter extracellular fluid by passing a blood brain barrier, so that the lactic acid content of the extracellular fluid is reduced. The method provided by the invention has extremely important research values on a neuroprotective mechanism of the PQQ, especially in the aspect of disease study related to senility.

The invention discloses on-site treatment equipment for defective cigarettes. The on-site treatment equipment for the defective cigarettes comprises a rack box body, wherein a carding device, a conveying device, a slitting device and a screening device are arranged in the rack box body; the conveying device is positioned below the carding device, and the discharge end of the conveying device extends to the feeding end of the slitting device; and the discharge end of the slitting device corresponds to the feed inlet of the sieving device. The on-site treatment equipment for the defective cigarettes has the advantages that the functions are highly integrated, the on-site treatment equipment is small and exquisite, a single piece of equipment is in butt joint with a cigarette making machine,the original defective cigarette collecting box is replaced, the defective cigarettes can be treated in situ, and the on-site treatment equipment for the defective cigarettes is simple and reliable touse and operate.

The invention provides a method for simultaneously and quantitatively detecting psychotropic drugs or metabolites thereof in a biological sample by adopting a UPLC-UV detection method. The method comprises the following steps: S1, chromatographic conditions; S2, working solution preparation; and S3, a determination method. The retention time tR and peak area integral of the standard substance and the test substance of the mental drug and the metabolite thereof are respectively obtained, a standard curve is established for the concentration of the mixed standard substance solution and the corresponding peak area / internal standard area ratio, and then the concentration of the test substance solution is obtained according to the peak area integral of the test substance solution and the standard curve. The invention also discloses a detection kit prepared by the method. According to the present invention, the separation of the common psychiatric drugs in the biological sample is achieved by using the UPLC-UV method, and the kit is prepared from the common psychiatric drugs, such that the in-vivo concentration of the common clinical psychiatric drugs can be rapidly, simply, accurately and quantitatively detected, and the good academic and commercial values are provided.

The invention belongs to the technical field of titanium slag smelting, and particularly relates to a slag-iron separation promoter as well as a preparation method and a use method of the slag-iron separation promoter. The slag-iron separation promoter is prepared from the following components in percentage by mass: 70-90 % of iron powder, 5-15 % of coke powder, 2-8 % of magnesium oxide powder, 1-5 % of a binder, and 1-5 % of water. The slag-iron separation promoter is used for slag-iron separation in the titanium slag smelting process, the slag-iron separation time can be effectively shortened, the iron inclusion proportion in slag can be reduced, and the tapping temperature can be reduced.

The invention discloses a capillary electrophoresis-enhanced light emitting diode-induced fluorescence detecting system and a detecting method thereof. The system is mainly composed of a capillary column, an excitation light source, a convex lens, a conducting optical fiber, a silver-plated concave mirror, a photomultiplier tube PMT and other components, wherein the silver-plated concave mirror isarranged below a capillary detection window; the photomultiplier tube PMT is arranged above the capillary detection window and is located right above the silver-plated concave mirror for detecting sample emitting light converged and enhanced by the silver-plated concave mirror; and a detection recording system receives and processes the output signals of the photomultiplier tube PMT and records and displays the obtained detection result. Thus, through convergence of the silver-plated concave mirror, the sample emitting light-light propagating from different directions excited by the excitation light source are converged and reflected, the intensity and the brightness of the reflected light are further enhanced, and the detection sensitivity is finally greatly improved. Under equal other conditions, the sensitivity of the detection method is 30 times that of the conventional method.

The invention belongs to the technical field of biological pharmacy, and particularly relates to a synthesis method of enzyme-catalyzed (1S, 5R)-bicyclolactone. The method comprises the following steps of preparing engineering bacteria containing Bayer-Villiger monooxidase; preparing a resting cell suspension of the engineering bacteria, ultrasonically crushing or pressurizing and crushing to obtain a supernatant containing Bayer-Villiger monooxidase cells, mixing the supernatant with a substrate racemic substituted bicyclo [3.2.0]-hept-2-ene-6-one, a hydrogen donor and a cofactor, and carrying out asymmetric Bayer-Villiger oxidation to prepare (1S, 5R)-bicyclolactone, wherein an amino acid sequence of the Bayer-Villiger oxidase is shown as SEQ ID NO. 1. According to the method, racemic substituted bicyclo [3.2.0]-hept-2-ene-6-one (II) can be catalyzed to generate chiral (1S, 5R)-bicyclolactone, the used engineering bacteria is convenient and easy to obtain, and the product is convenient to separate and high in enantioselectivity.

The invention relates to a UHPLC-ICPMS online bromide and iodide species determination analysis method. The method uses HPLC and ICPMS technologies in a combined way, and comprises the following steps of selecting UHPLC and an ICP-MS instrument; performing ICP-MS instrument parameter optimization; configuring a separation column and a protection column of the UHPLC; optimizing the separation conditions; connecting a pipeline of the UHPLC and the ICP-MS instrument; performing leakage inspection; performing pretreatment on the sample to be tested; determining the separation time through an experiment chromatography separation diagram; measuring the standard curve, the detection limit and the precision; performing sign adding recovery and practical sample determination. The method has the advantages that the separation time is short; the linear relationship is good; the detection limit is low; the sign adding recovery rate is high; the precision is high. The method can be used for the trace analysis of the bromide and iodide species in samples of environment and the like; the fast separation and accurate determination can be realized; the accurate determination of the sample can be completed in 5 minutes.

The invention provides a method for detecting content of methanol in tobacco flavor. The method comprises the following steps: preparation of an internal standard solution, preparation of a standard solution, preparation of a sample solution, and detection of methanol content by gas chromatography. The gas chromatography is used for direct detection of the content of methanol in tobacco flavor, so that methanol and other interference components can be effectively separated; and the method has the advantages of simple operation, rapid, accuracy, high sensitivity, and good repeatability.

The invention relates to a method for detecting yeast beta-glucan in milk or a milk product. The method comprises 1, pretreatment: carrying out enzymolysis on milk or a milk product through a neutral protease or an alkaline protease, carrying out centrifugation on the enzymolysis product, cleaning the precipitates obtained through centrifugation through pure water or deionized water, adding an monobasic acid into the precipitates and carrying out heating hydrolysis, and 2, analysis: determining glucose content of the pretreatment product through ion chromatography and calculating yeast beta-glucan content of the milk or milk product.

The invention provides a construction method of a lindley eupatorium herb formula granule fingerprint spectrum, a standard fingerprint spectrum of the lindley eupatorium herb formula granule and application of the standard fingerprint spectrum, and belongs to the technical field of medicine detection.The construction method comprises the steps that a test solution, a reference medicinal material solution and a reference substance solution are prepared, acetonitrile (A) and a 0.1-0.3 wt% phosphoric acid aqueous solution (B) are jointly used as mobile phases, and the standard fingerprint spectrum of the lindley eupatorium herb formula granule is obtained. Performing high performance liquid chromatography detection to obtain a fingerprint spectrum of the lindley eupatorium herb formula granules; the standard fingerprint spectrum of the lindley eupatorium herb formula granules is obtained by using the construction method, and the standard fingerprint spectrum is used for quality evaluation or control in the whole process of research / development / production / clinical application of the lindley eupatorium herb formula granules. According to the method for constructing the fingerprint spectrum of the lindley eupatorium herb formula granules, main medicinal material components in the lindley eupatorium herb formula granules can be detected only through high performance liquid chromatography, and the quality condition of the lindley eupatorium herb formula granules can be comprehensively reflected.

The inventive method consists in carrying out rubber crumb thermolysis in a fluidized layer in the vertical flow of a supercritical hydrocarbon alkylaromatics-containing gas. The rubber crumb thermolysis is carried out in a reactor at a mass ratio between a solvent and residues less than 0.1. The solvent is also used in the form of a fluidizing agent, a heat carrier and for removing reaction products from the reactor, thereby enabling the solvent to flow in such a way that all the products produced by the rubber crumb thermolysis are totally removed from the reactor in the main stream with the solvent.

The invention discloses a method for forecasting a leading chromatographic peak shape under the multi-order programmed temperature condition. The method mainly comprises the followings: evaluating a chromatographic retention factor value under different temperatures according to a virtual dead time; searching out a peak shape parameter PSP under the constant temperature condition through a computer program according to nonlinear plate theory; establishing the functional relations between the retention factor as well as the peak shape parameter and the temperature through the regression analysis based on the retention factor and the peak shape parameter of a to-be-detected compound under different constant temperatures; and setting the temperature program, obtaining the forecasted leading chromatographic peak shape through calculation of the computer and comparing with a testing peak shape obtained under the same programmed temperature condition. The invention provides a vital basis for qualification of the type of chromatographic peak shape such as the leading chromatographic peak, optimizes the chromatographic fractionation condition, and provides a new way for accurate quantification of overlapping chromatographic peak common in a laboratory at the same time; and furthermore, the method is widely applicable, and has high forecasting accuracy.

This invention discloses a method for preparing biomembrane filler with stacked ball structure for reducing sludge amount, and its application. The biomembrane filler is composed of natural stone material, thermosetting resin binder, curing agent, and biomembrane carrier with certain particle diameters. The biomembrane filler can reduce the amount of sludge in high-concentration organic wastewater. The biomembrane filler has such advantages as stable biomembrane hanging and running. The stacked ball structure optimizes sludge retention time and hydraulic retention time, enriches the biological phase, and avoids the restriction of specific surfacearea to the biological amount in traditional biomembrane method. The biomembrane filler also optimizes the separation conditions of wastewater and suspended solids. The method has such advantages as simple process, easy maintenance, low construction and running cost of wastewater treatment plant, no secondary pollution, high efficiency, and high profit, and is environmentally friendly.

The invention provides a method for detecting retinol and its precursor, comprising the following steps: (1) extracting retinol and / or its precursor from a sample; (2) separating retinol and / or its precursor by HPLC ; (3) MS / MS quantitative detection; the sample is a dried blood filter paper specimen, and the extractant used is chloroform. The present invention uses filter paper as a carrier to absorb a small amount of blood to make a dry blood filter paper, which overcomes the inconvenience of taking too much blood when collecting venous blood when collecting serum to detect retinol in the past, poor compliance of the crowd, death of animal models after blood drawing, and inconvenient specimens. Difficulties such as distance transportation. The present invention has small matrix effect, good linear relationship in analysis within the concentration range of the standard curve, low detection limit, high sensitivity, good accuracy and high precision, and has correlation with the result of detecting serum retinol by HPLC method, At the same time, the content of retinol and its precursors in the sample is analyzed simultaneously, which provides a method for comprehensively evaluating the level of retinol in the body.

The invention provides a tetrafluoroethylene (TFE) refining method, which comprises the following steps of 1, conveying TFE production pyrolysis gas into a first separation tower to be separated; recovering TFE from tower top gas of the first separation tower; introducing coarse gas of the first separation tower into a rectification tower after the coarse gas of the first separation tower is exhausted from the middle part of the first separation tower; enabling tower kettle liquid of the first separation tower to enter a heavy ingredient recovery system; 2, after the coarse gas of the first separation tower enters the rectification tower to be subjected to rectification, obtaining TEF monomers from the tower top of the rectification tower; enabling tower kettle liquid of the rectification to enter a second separation tower. The TFE refining method has the beneficial effects that the first separation tower middle part side line production scheme is used; light ingredients are produced from the tower top of the first separation tower and enter a TFE recovery system for recovering TFE and then discharging light ingredients; middle part side line TFE coarse gas enters the rectification tower, and the TFE monomers with the purity being greater than 99.9999 percent can be obtained from the tower top of the rectification tower.