30 results about "Sample concentrator" patented technology

A sample concentrator for concentrating analytes in a solvent-containing liquid sample stream, including concentrator housing having a sample stream flow channel and a gas stream flow channel having an inlet and an outlet, a heater for gas in the gas stream conduit, and a hydrophilic ion exchange or non-ionic membrane barrier separating said gas stream flow channel and said sample stream flow channel. Solvent is evaporated from the liquid sample stream in said sample stream flow channel in or at the interface with said membrane, when the gas stream is at an elevated temperature. A regeneration step is used to regenerate the ion exchange membrane barrier.

A toxic material detection apparatus includes a sample collection portion including a sample inlet and a sample concentrator adapted to concentrate an environmental sample on a substrate. A sample distributing system transfers portions of the substrate to a color sensor and an ion mobility spectrometer for simultaneously analysis and toxin detection, particularly cholinesterase inhibitor detection. Optionally, a portion of the substrate may be directed to an archive for possible analysis at a later time. Reagents utilized include the enzyme acetylcholinesterase (AChE), and the reactants acetylthiocholine iodide (ATCI) and 5,5′-dithio-bis-(2-nitrobenzoic acid) (DTB). A data management unit provides for near-real-time analysis of the samples in under 5 minutes. Simultaneous “hits” by both analysis methods indicate the presence of a cholinesterase inhibitor.

A sample concentrator for concentrating analytes in a solvent-containing liquid sample stream, including concentrator housing having a sample stream flow channel and a gas stream flow channel having an inlet and an outlet, a heater for gas in the gas stream conduit, and a hydrophilic ion exchange or non-ionic membrane barrier separating said gas stream flow channel and said sample stream flow channel. Solvent is evaporated from the liquid sample stream in said sample stream flow channel in or at the interface with said membrane, when the gas stream is at an elevated temperature. A regeneration step is used to regenerate the ion exchange membrane barrier.

The invention discloses a method used for detecting multiple trace drug pollutants in drinking water simultaneously. A water sample membrane is filtered first, Na2EDTA is added, and the pH of a water sample is adjusted; solid-phase extraction is conducted through methyl alcohol, a Na2EDTA solution and ultrapure water activated HLB in sequence to obtain a column, column chromatography is conducted on the water sample, the column is pumped for a half hour to be dried, the solid-phase extraction column is eluted through methyl alcohol under the gravity condition, a termovap sample concentrator is used for blowing an eluant dry, and a solution proportional to an initial mobile phase is added to dissolve residues; a high performance liquid chromatograph mass spectrometer is used for quantitatively detecting target substances of drugs( namely PPCPs). Various target substances are detected, a pretreatment method is easy to operate, environmentally friendly and high in concentration multiple, and the method is good in reproducibility. The method has the advantages that the application range is wide, sensitivity is high, and various substances are detected.

The invention discloses a preparation method of a quaternary ammonium chitosan HTCC-silver / PES antibacterial film. First, the positively charged HTCC is used as the surface active functional layer, the PES ultrafiltration membrane with good hydrophilic performance is used as the support layer, and epichlorohydrin is used as the crosslinking agent, and the positively charged quaternary ammonium is prepared by coating crosslinking reaction method. Chitosan HTCC / PES composite nanofiltration membrane. Then soak the nanofiltration membrane in a certain concentration of silver nitrate solution, and dry the membrane with a nitrogen blower. Finally, photochemical reduction technology is used to reduce the silver ions on the membrane surface into silver particles. The preparation method has a simple process, can be carried out at normal temperature, has good reproducibility, does not need to add a reducing agent, is easy to control the particle size, and is natural and environmentally friendly. The antibacterial film prepared according to this method has excellent hydrophilic properties, mechanical properties and swelling properties, and is resistant to Gram-negative bacteria E. coli Rosetta and E. coli DH5α and Gram-positive bacteria Bacillus subtilis Both have good antibacterial ability, and this kind of membrane has a high rejection rate for most PPCPs, and can be used for the separation and removal of trace-trace pollutants in the water environment, especially positively charged substances.

A continuous electrochemical pump comprising a water generator compartment, an anode compartment on one side of said generator compartment, a cation exchange barrier, separating the generator compartment from the anode compartment, a first electrode in electrical communication with the anode compartment, a cathode compartment adjacent the generator chamber, an anion exchange barrier, separating the generation compartment from the cathode compartment, and a second electrode in electrical communication with the cathode compartment. Use of the pump as a sample concentrator. A feedback loop for the pump. A reservoir, with or without an intermediate piston, on the output side of the pump.

The present invention relates to experiment device for sample concentration, which comprises air distribution system composed of air source, pressure reducing valve, air distribution hatch cover, air distribution hatch and air blow tubule; sample location frame with calibrated sample concentrator; heater composed of temperature control device and water bath; vacuum system composed of vacuum pump, vacuum hatch and atmospheric valve; and solvent recovery system. Inert gas or air passes tubule with high speed for the negative pressure of vacuum hatch and differential pressure of two ends of tubule and forms high speed air flow to blow and clean liquid sample in concentration tube, gasify and bring out liquid solvent quickly, and decrease concentration time; meantime, use solvent recovery system to decrease pollution.

A continuous electrochemical pump comprising a water generator compartment, an anode compartment on one side of said generator compartment, a cation exchange barrier, separating the generator compartment from the anode compartment, a first electrode in electrical communication with the anode compartment, a cathode compartment adjacent the generator chamber, an anion exchange barrier, separating the generation compartment from the cathode compartment, and a second electrode in electrical communication with the cathode compartment. Use of the pump as a sample concentrator. A feedback loop for the pump. A reservoir, with or without an intermediate piston, on the output side of the pump.

The invention relates to a concentration method for a Jinjunmei black tea aroma component. Jinjunmei black tea is weighed and added into a reaction vessel, purified water is then added, distillation is then carried out, and distillate is collected; dichloromethane, aether and petroleum ether mixture is added into the distillate, extraction is carried out continuously for three to five times, the organic phase is centrifuged, the upper organic phase is taken out, moisture in the upper organic phase is removed, and a filter membrane is then used for filtration; mixed solution which is obtained after filter membrane filtration is injected into a distillation reactor, the distillation reactor is then put into a constant-temperature water bath kettle for fractionation concentration with a Vigreaux tube on a fractionation column, a termovap sample concentrator is used for concentrating the concentrated mixed solution, and thereby the concentrated Jinjunmei black tea aroma component is obtained. The concentration method is easy and convenient to operate, time and labor are saved, cost is low, the concentration method plays the role of enriching and concentrating the trace component, and is favorable for the qualitative and quantitative analysis of the trace substance, moreover, the loss of the volatile component is reduced effectively, and thereby the recovery rate of the aroma substance is increased.

The invention relates to a method for screening a plasticizer. The method comprises the following steps of: (1) activating a solid-phase extraction column; (2) enriching the plasticizer in a to-be-tested sample by the activated solid-phase extraction column; (3) washing the solid-phase extraction column; (4) eluting the plasticizer from the solid-phase extraction column; (5) concentrating an eluent to dry by a sample concentrator and dissolving the eluent by a solvent; and (6) implementing TCL (Thin Layer Chromatography) point-plate comparison between a liquid dissolved in the step (5) and a plasticizer standard, and judging whether the plasticizer is contained. The method achieves a detection limit of 0.3mg / kg and breaks through the limitation that a large-sized instrument is needed by detection in the past; the method has the advantages that analysis cost is low, detection is sensitive, recovery rate is high, the operation is simple, accuracy rate of an experiment result is high, rapid detection on site can be achieved, requirements on operators are low, and popularization and application are convenient.

The present invention relates to a steam sample concentrator and conditioning (SSCC) system. The SSCC finds use in concentrating impurities carried in steam (e.g., used in power generation and other industrial processes) and facilitating steam analysis.

The present invention relates to experiment device for sample concentration, which comprises air distribution system composed of air source, pressure reducing valve, heating hatch, temperature control device, air distribution hatch cover, air distribution hatch and air blow tubule; sample location frame with calibrated sample concentrator; vacuum system composed of vacuum pump, vacuum hatch and atmospheric valve; and solvent recovery system. Inert gas from air distribution system passes tubule with high speed for the negative pressure of vacuum hatch and differential pressure of two ends of tubule and forms high speed air flow to blow and clean liquid sample in concentration tube, gasify and bring out liquid solvent quickly, and decrease concentration time; meantime, use solvent recovery system to decrease pollution.

The invention relates to a sample concentrator. The sample concentrator comprises a housing for supporting the whole structure unit, a support which is provided with multiple sample pipe holes and is used for receiving a sample pipe, a temperature control system and a multiple-path gas supply system. The temperature control system comprises a heating device and a switch device. The multiple-path gas supply system comprises an air pump, a switch device, a gas guide panel, gas blowpipes and a limiting device. The gas guide panel is crosswise provided with the multiple gas blowpipes. The air pump, the gas guide panel and the multiple gas blowpipes are orderly and hermetically communicated. The limiting device is arranged between the air pump and the gas guide panel and is used for adjusting height of the gas guide panel. A gas speed adjustment control valve is seal-connected to each one of the gas blowpipes and the gas guide panel and is arranged between the gas blowpipe and the gas guide panel. The sample concentrator utilizes single-air passage control and satisfies different gas amount requirements on treatment on different samples.

A multi-channel full-automatic termovap sample concentrator and a concentrated solution detection and control method belong to the field of laboratory instruments. A plurality of water bath tanks arearranged, the plurality of water bath tanks are uniformly arranged at the periphery of a turntable; test tube racks are arranged on the water bath tanks; purging support frames are arranged on the test tube racks; the used water and gas are heated by a heating part and are respectively conveyed to water distribution pipes and purging needles; photoelectric detection devices for detecting the liquid levels of sample solutions in test tubes are arranged beside the water bath tanks; the inner sides of the water bath tanks are communicated with auxiliary water tanks; the test tube racks and the auxiliary water tanks are respectively connected with respective lifting devices; and the lifting devices, the sample liquid level photoelectric detection devices and a cyclic pump are electrically connected with a controller. By means of the device and method, the solution evaporation speed can be increased, the purging efficiency can be improved, and therefore the experiment precision under the same condition can be obtained, errors can be reduced, and the recovery rate and the analysis precision of samples can be improved.

The present invention relates to a steam sample concentrator and conditioning (SSCC) system. The SSCC finds use in concentrating impurities carried in steam (e.g., used in power generation and other industrial processes) and facilitating steam analysis.

The invention discloses a method for separating and analyzing tetracyclines in a large-volume environment water sample. An electrostatic spinning technology is adopted to prepare graphene-doped polyacrylonitrile-maleic anhydride copolymer (PANCMA-GO) electrospining nano fibers, sample liquid is stirred for 5 minutes, the trace tetracyclines in the environment water sample are extracted and enriched, analytically-pure methanoic acid / absolute methanol / analytically-pure trichloromethane mixed liquid with a volume ratio of 2 to 4 to 4 is adopted for conducting elution on the tetracyclines which are enriched on the PANCMA-GO electrospining nano fibers, eluant is collected, and is subjected to blow-dry through a termovap sample concentrator, then a methyl alcohol aqueous solution is used for dissolution again, and high performance liquid chromatography-fluorescence spectrum combination is used for analysis and measurement, so that the trace tetracyclines in the large-volume environment watersample are separated and analyzed. The method is simple to operate, good in repeatability, and high in sensibility, has a reliable detection result, and can be applied to accurate detection of traceTCs in various environment water samples.

The invention belongs to the field of chemical analysis devices and relates to an automatic termovap sample concentrator. The automatic termovap sample concentrator comprises a conical test tube, a waste liquid collecting box, a bracket and a moving mechanism; the waste liquid collecting box is arranged at the rear part of the bracket; three pipelines penetrate through a bracket top plate; the three pipelines can rotate; the three pipelines include a nitrogen blowing pipe, a volume fixing pipe, and a scale fixing pipe; the bracket top plate is connected to a bottom surface fixing plate through two supporting columns; a guide shaft penetrates through the movable plate of a moving mechanism; two ends of the guide shaft are fixedly connected with the bracket top plate and the bottom surface fixing plate respectively; a ball screw A is connected with the movable plate in a matched mode; a motor A is fixedly arranged at the upper portion of the movable plate; and a bevel gear B is connected with a bevel gear A in a matched mode. According to the device, automatic nitrogen blowing, volume fixing and scale fixing are achieved; large errors caused by the manual nitrogen blowing of an experimenter are avoided; efficiency can be improved; and an environment-friendly effect is good. The method has a potential market value.

The invention discloses a method for measuring aescin A, B, C and D in human plasma through utilization of an LC-MSMS method. The method comprises the following steps of carrying out acidizing; carrying out high speed centrifugation; carrying out drying through utilization of a termovap sample concentrator; and carrying out redissolving and swirling. According to the method, a sample is processedthrough precipitation of protein by methanol, and after nitrogen drying and redissolving are carried out, the sample is injected. Compared with solid phase extraction, the method has the advantages that a recovery rate is stable, processing time is greatly reduced, cost is clearly reduced, four compositions are measured, quantitation lower limits are clearly separated, the quantitation lower limits of aescin A, B, C and D are 20pg / mL, 20pg / mL, 40pg / mL and 40pg / mL, and an oral pharmacokinetic sample measurement requirement is satisfied. Plasma is added to acidizing stabilizer. ISR analysis qualification rates of the four compositions are more than 95%. The method is applied to aescin oral preparation clinical pharmacokinetic study. A pharmacokinetic behavior can be drawn completely.

A sample concentrator tube having a heat-resistant planar heating element adhered thereto, an analysis device comprising the same, and an analysis method using the same, according to the present invention, have an effect capable of precisely controlling the temperature by heating the sample concentrator tube uniformly and rapidly to a target temperature for desorption, and of desorbing an adsorbed sample almost simultaneously in any part of an adsorbent by minimizing the local temperature difference of the adsorbent in the tube. In addition, it is possible to minimize chemical noise by preventing thermal denaturation of the adsorbent caused by overheating, and there is an advantage of excellent reproducibility as well as an effect of being inexpensive, economical, and excellent in energy efficiency.

The invention belongs to the technical field of phospholipid deep processing, and relates to an egg yolk phosphatidyl choline preparation method based on low-pressure column chromatography. Egg yolk raw phospholipid is dissolved in chloroform; silica gel is used as a stationary phase; a chloroform, methyl alcohol and glacial acetic acid mixed solution is used as an eluting agent for performing gradient elution; in the elution process, the thin-layer chromatography is used for monitoring; phosphatidyl choline containing ingredients are collected and eluted; rotary evaporation and concentrationare performed; a termovap sample concentrator is used for drying; egg yolk phosphatidyl choline with the purity being 90 to 98 percent is prepared. A ternary mixed solvent is used for gradient elution; the operation process is simple; the process is simple; complicated equipment is not needed; the cost is low; the production efficiency is high; the method is suitable for industrial production; organic solvents can be recovered and used; fillers are repeatedly used through regeneration treatment. The prepared egg yolk phosphatidyl choline can be used in the industrial fields of functional food,medicine, cosmetics and the like.

A continuous electrochemical pump comprising a water generator compartment, an anode compartment on one side of said generator compartment, a cation exchange barrier, separating the generator compartment from the anode compartment, it first electrode in electrical communication with the anode compartment, a cathode compartment adjacent the generator chamber, an anion exchange barrier, separating the generation compartment from the cathode compartment, and a second electrode in electrical communication with the cathode compartment. Use of the pump as a sample concentrator. A feedback loop for the pump. A reservoir, with or without an intermediate piston, on the output side of the pump.

Provided is an integrated sample concentrator comprising a sample concentrating unit for concentrating a sample and a nitrogen and air generation unit provided below the sample concentrating unit. Thesample concentrating unit comprises: a sample concentrating unit housing provided with a glass window allowing the interior to be observed, and a fan for discharging evaporated solvent; a test tube holder for holding a plurality of test tubes; a sliding shelf provided below the test tube holder; a plurality of spray nozzles for spraying nitrogen or air into the test tubes; a spray nozzle holder for fixedly holding the spray nozzles; an elevating unit for vertically moving the spray nozzle holder; and a control unit for controlling the operation of the sample concentrator. The nitrogen and airgeneration unit comprises: a nitrogen and air generation unit housing provided with a front door and a back door, and barrier plates, with open top and bottom, installed downwardly on the left and right inner walls; a nitrogen generation module containing unit provided with a mode-switching switch to switch between a nitrogen mode and a dry air mode, and equipped with a nitrogen generation modulecomprising a nitrogen membrane for separating nitrogen when compressed air is supplied; a storage tank module containing unit provided with a first pressure gauge for indicating the pressure of nitrogen or air stored in the front, having a supply tube connected in the rear surface thereof to supply the sample concentration unit with nitrogen or air, and having a storage tank module installed in the interior thereof to store nitrogen or air; and an air compression module containing unit provided with a power switch on the front surface thereof to control the operation of the nitrogen and air generation unit, and equipped with an air compression module for suctioning in and compressing atmospheric air. Additionally, the nitrogen generation module containing unit, storage tank module containing unit, and air compression module containing unit are coupled to the nitrogen and air generation unit housing, each having rails provided on both side surfaces thereof to allow sliding, and each being provided with a handle on the front surface thereof.

The invention discloses a method for determining melatonin in faeces by using high performance liquid chromatography. The method comprises the following steps: mashing and uniformly mixing to-be-determined faeces, freeze-drying the to-be-determined faeces by using a freeze dryer, leaching the to-be-determined faeces by using methanol, centrifuging, taking a supernatant, and blow-drying the supernatant by using a termovap sample concentrator; performing dissolution by using an acetonitrile n-hexane solution, centrifuging, taking a subnatant, and filtering the subnatant by using a microfiltration membrane; and performing high performance liquid chromatography detection on a machine, and quantifying the melatonin in the faeces sample by adopting an external standard method. The melatonin in the faeces is extracted and detected for the first time; the detection method is high in sensitivity, high in specificity, good in stability and accurate and reliable in result; a novel animal non-invasive melatonin detection method can be established; and the circadian rhythm of animal endogenous melatonin secretion is clarified.

The invention relates to a method for extracting a piperazine residue from a chicken tissue, an egg and pork by using an accelerated solvent extraction instrument and derivatizing. The method is as follows: grinding a blank sample of kieselguhr, putting in an extraction pond, extracting through ASE (Accelerated Solvent Extraction), sequentially extracting with n-hexane and formic acid acetonitrileat the static state; purifying an extract liquor through a Strata-X-C column, collecting a sample solution, and blowing dry in a termovap sample concentrator; redissolving with acetonitrile, conducting ultrasonic treatment, shaking up evenly, transferring a trimethylamine and dansyl chloride solution, metering the volume by using the acetonitrile, reacting in the dark place, processing through a0.22 mum organic phase syringe filter after finishing the reaction, and conducting HPLC-FLD detection on a filtrate. By adopting the method, the extraction and recovery rates of the piperazine in thechicken tissue, the egg and the pork at the fortified concentration of LOQ are both more than or equal to 72.86%, the extraction and recovery rates of the piperazine at the fortified concentrations of0.5 MRL, 1.0 MRL an 2.0 MRL are more than or equal to 82.26%, and the requirement of a method for detecting the residue of a veterinary drug is met.

A sample concentrator tube having a heat-resistant planar heating element adhered thereto, an analysis device comprising the same, and an analysis method using the same, according to the present invention, have an effect capable of precisely controlling the temperature by uniformly and rapidly heating the sample concentrator tube to a target temperature for desorption, and capable of almost simultaneously desorbing an adsorbed sample in any part of an adsorbent by minimizing a local temperature difference of the adsorbent in the tube. In addition, it is possible to minimize chemical noise by preventing thermal denaturation of the adsorbent caused by over-heating, and there is an advantage of excellent reproducibility as well as an effect of being inexpensive, economical, and excellent in energy efficiency.

Provided is an integrated sample concentrator comprising a sample concentrating unit for concentrating a sample and a nitrogen and air generation unit provided below the sample concentrating unit. The sample concentrating unit comprises: a sample concentrating unit housing provided with a glass window allowing the interior to be observed, and a fan for discharging evaporated solvent; a test tube holder for holding a plurality of test tubes; a sliding shelf provided below the test tube holder; a plurality of spray nozzles for spraying nitrogen or air into the test tubes; a spray nozzle holder for fixedly holding the spray nozzles; an elevating unit for vertically moving the spray nozzle holder; and a control unit for controlling the operation of the sample concentrator. The nitrogen and air generation unit comprises: a nitrogen and air generation unit housing provided with a front door and a back door, and barrier plates, with open top and bottom, installed downwardly on the left and right inner walls; a nitrogen generation module containing unit provided with a mode-switching switch to switch between a nitrogen mode and a dry air mode, and equipped with a nitrogen generation module comprising a nitrogen membrane for separating nitrogen when compressed air is supplied; a storage tank module containing unit provided with a first pressure gauge for indicating the pressure of nitrogen or air stored in the front, having a supply tube connected in the rear surface thereof to supply the sample concentration unit with nitrogen or air, and having a storage tank module installed in the interior thereof to store nitrogen or air; and an air compression module containing unit provided with a power switch on the front surface thereof to control the operation of the nitrogen and air generation unit, and equipped with an air compression module for suctioning in and compressing atmospheric air. Additionally, the nitrogen generation module containing unit, storage tank module containing unit, and air compression module containing unit are coupled to the nitrogen and air generation unit housing, each having rails provided on both side surfaces thereof to allow sliding, and each being provided with a handle on the front surface thereof.

The invention discloses an efficient termovap sample concentrator. The efficient termovap sample concentrator comprises a worktable, a plurality of heating discs, test tube discs which correspond to the heating discs, a needle blowing disc and a rocker arm, wherein the rocker arm is fixed at the center of the worktable; the heating discs are arranged on the worktable in an array along the circumference by taking a fixed point of the rocker arms as the circle center; the needle blowing disc is arranged just above any heating disc through the rocker arm; the needle blowing disc can do circular motion by taking the rocker arm as the circle center. The efficient termovap sample concentrator is simple in structure and meets the requirements of large-batch rapid detection.

The invention discloses a method for detecting the content of marbofloxacin in dog blood plasma. The method comprises the following steps: 1, taking a marbofloxacin-containing dog blood plasma sample,adding marbofloxacin used as an internal standard substance, carrying out vortex uniform mixing for 8-13 s, adding acetonitrile to precipitate proteins, carrying out vortex uniform mixing for 20-40 s, standing the obtained material for 2-4 min, centrifuging the material, and taking the obtained supernatant; 2, carrying out 50 DEG C blow drying on the supernatant obtained in step 1 by a Termovap sample concentrator, adding a mobile phase solution to redissolve the dried supernatant, and allowing the redissolved supernatant to go through a 0.22 [mu]m micro-porous filtering film to obtain a sample to be detected; and 3, taking the sample to be detected, obtained in step 2, and qualitatively and quantitatively detecting the sample to be detected through LC-MS / MS. The marbofloxacin is used asthe internal standard substance, and the acetonitrile is used to precipitate the plasma proteins, so the extraction rate of the marbofloxacin from the dog blood plasma is greatly improved; and the marbofloxacin is quantitatively detected through the LC-MS / MS, so the method has the advantages of accurate detection result, simple steps in the detection process, high specificity and short time, and provides a fast and accurate analysis and determination method for clinical pharmacokinetics of the marbofloxacin.