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31results about How to "Reduce preprocessing steps" patented technology
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Pretreatment method for detecting nitrofuran metabolites in aquatic product
InactiveCN102621252ALow solvent contentImprove elutionComponent separationChromatographic separationRotary evaporator
The invention discloses a pretreatment method for detecting nitrofuran metabolites in an aquatic product. The method comprises the following steps of: weighing a sample to be detected, dissolving, derivating, extracting, and performing chromatographic separation. A constant temperature oscillator, a reduced pressure rotary evaporator, a silica gel chromatographic column and a high speed refrigerated centrifuge are used in the method. A sample solution prepared by the method can be directly detected by liquid chromatography-tandem mass spectrometry. Compared with the conventional national standard method, the pretreatment method has the advantages of low cost, high repeatability and the like, is simply and effectively operated, is high in operability, is expected to be popularized and applied to environmental protection industry, commodity inspection, entry-exit inspection and quarantine and the like on a large scale, and is obvious in economic and social benefits.
Owner:FUJIAN CCIC FAIRREACH FOOD SAFETY TESTING
Method of simultaneously detecting various synthetic pigments in wheaten foods via HPLC-DAD
InactiveCN107748210AAvoid interferenceSimplify preprocessing stepsComponent separationHplc dadFood additive
The invention relates to the technical field of detection of synthetic pigments and especially relates to a method of simultaneously detecting various synthetic pigments in wheaten foods via HPLC-DAD.The method includes the following steps: A) preparation of standard work solutions and samples; b) extraction of a sample solution; C) HPLC-DAD analysis to the solution prepared in the step B); D) calculation of content of to-be-detected substances with standard curve. In the HPLC-DAD detection method, pretreatment steps are simplified, wherein solid-phase extraction and concentration steps are avoided, thus reducing pretreatment time. Detection is carried under wavelength of 400-600 nm, so that interference due to majority of food additives and natural pigments is avoided. The method is accurate, quick and simple, has reliable quantitative results, can effectively detect ten artificially synthetic pigments in one time, and is very suitable for simultaneously treating samples in multi-batches.
Owner:昌邑市检验检测中心
Hybrid protein rapid enzymolysis method
InactiveCN101457247AShorten the timeReduce preprocessing stepsMaterial analysis by electric/magnetic meansFermentationProteinase activityProtein insertion
The invention relates to a method for fast enzymolysis of hybrid proteins comprising: providing protein samples to be enzymolysis; obtaining the denatured protein samples after the degeneration treatment of said protein samples; treating said denatured protein samples by means of protease enzymolysis and assistant with ultrasonic, obtaining the protein polypeptide fragments. The invention also provides a method for fast identifying the protein. The method of the invention can quickly and high efficiently implement the protein enzymolysis and identification with easy operation and high accuracy.
Owner:EAST CHINA UNIV OF SCI & TECH
Method for measuring impurities in pure silver by electrical inductance-coupled plasma emission spectrometer
InactiveCN102565029AEliminate distractionsReduce workloadAnalysis by thermal excitationData controlFull wave
The invention relates to a method for measuring impurities in pure silver by an electrical inductance-coupled plasma emission spectrometer, which is characterized by specifically comprising the following steps of: adding sulfuric acid to dissolve a pure silver sample to be measured; completely dissolving the sample to be measured; adding hydrochloric acid, boiling to be clear, cooling, and separating matrix silver of the sample; refining in a precipitating way; replenishing 10% of hydrochloric acid, and setting the volume to be degree scale by deionized water; and turning on the electrical inductance-coupled plasma emission spectrometer, turning on analysis control software, clicking a 'firing' button so as to form stable plasma fire, carrying out full-wave band scanning, correcting a light path, selectively entering a data control program, selecting a spectrum line of an element to be measured, setting a concentration value of a curve, measuring standard curve solution according to the concentration from low to high sequentially, and measuring so as to obtain relevant parameters at data state bars. The method has the advantages of being less in sample consumption, short in test period, multiple in analyzed element types, high in accuracy, good in reliability, high in precision, small in value adding interference, etc.
Owner:BEIJING INST OF NONFERROUS METALS & RARE EARTH
Preparation method of titanium oxide extraction bar for solid phase microextraction
InactiveCN101757898ALarge specific surface areaCoating thickness controllableOther chemical processesPolypropyleneSol-gel
The invention discloses a preparation method of a titanium oxide extraction bar for solid phase microextraction; in the method, a plurality of titanium oxide layers are deposited on the surface of polypropylene hollow fiber by adopting a sol-gel method, and then polypropylene matrix is removed by high-temperature firing, so as to obtain the titanium oxide hollow fiber extraction bar, realize extraction preenrichment to polar compounds with micro and trace amount in medicine and environment samples and carry out separation analysis to gas chromatography or high performance liquid chromatography; the extraction bar has a three-dimensional porous stricture, has larger specific surface area, controllable coating thickness, good chemical and heat stability, wide pH stabilization range (pH=1-14) and high extraction efficiency to the polar compounds.
Owner:LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Double digital PCR fluorescent quantitative detection method for transgenic maize BT176
InactiveCN105112530AReduce preprocessing stepsAvoid adverse effects on accuracyMicrobiological testing/measurementDNA/RNA fragmentationBiotechnologyReference genes
The invention provides a double digital PCR fluorescent quantitative detection method for transgenic maize BT176. According to the method, quantitative detection can be directly performed on the transgenic maize BT176 in genomes of samples to be detected, and therefore the standard curve plotting step in quantitative detection of a conventional PCR method and the sample preprocessing step in existing digital PCR detection are omitted; in addition, transgenic ingredients are calculated according to the proportion of the exogenous gene copy number and the reference gene copy number, and therefore the stability of quantitative detection of the transgenic ingredients can be improved by performing double detection on one reaction system. Through the method, absolute quantitative detection on the transgenic maize BT176 can be achieved, the quantitative detection limitation can reach 0.5%, the sensitivity can reach 0.1%, and the requirements of actual detection of all the transgenic ingredients can be met. In addition, the method is easy to operate and high in flexibility and serves as an effective method for absolute quantitative detection of transgenes.
Owner:CHINESE ACAD OF INSPECTION & QUARANTINE
Method for screening active components based on three-phase laminar flow microfluidic chip
ActiveCN109856278AAvoid adsorptionReduce mistakesComponent separationLaboratory glasswaresActive componentThree-phase
The invention discloses a method for screening active components based on a three-phase laminar flow microfluidic chip. Affinity molecules and free molecules are separated rapidly in a short-distancemicrochannel, so that the efficiency is improved. The automation degree and the reproducibility are high; and the free micromolecules can be enriched and concentrated simultaneously. Moreover, membrane-free effective separation of macromolecules and micromolecules is completed simultaneously by one step and the multi-step sample pre-treatment operation for molecular extraction is simplified, so that the time and effort are saved. The economic cost is saved; and the process of modernization of the traditional Chinese medicine is promoted substantially.
Owner:云浮市厚德中药饮片有限公司
Double digital PCR fluorescent quantitative detection method for transgenic maize MON810
InactiveCN105112539AReduce preprocessing stepsAvoid adverse effects on accuracyMicrobiological testing/measurementDNA/RNA fragmentationFluorescencePcr method
The invention provides a double digital PCR fluorescent quantitative detection method for transgenic maize MON810. According to the method, quantitative detection can be directly performed on the transgenic maize MON810 in genomes of samples to be detected, and therefore the standard curve plotting step in quantitative detection of a conventional PCR method and the sample preprocessing step in existing digital PCR detection are omitted; in addition, transgenic ingredients are calculated according to the proportion of the exogenous gene copy number and the reference gene copy number, and therefore the stability of quantitative detection of the transgenic ingredients can be improved by performing double detection on one reaction system. Through the method, absolute quantitative detection on the transgenic maize MON810 can be achieved, the quantitative detection limitation can reach 0.5%, the sensitivity can reach 0.1%, and the requirements of actual detection of all the transgenic ingredients can be met. In addition, the method is easy to operate and high in flexibility and serves as an effective method for absolute quantitative detection of transgenes.
Owner:CHINESE ACAD OF INSPECTION & QUARANTINE
One-bath quick-bleaching agent for printing and dyeing and preparation method and application of one-bath quick-bleaching agent
ActiveCN112359619AIncrease productivityReduce manufacturing costDyeing processChemistryDipropylene glycol
The invention discloses a one-bath quick-bleaching agent for printing and dyeing and a preparation method and application of the one-bath quick-bleaching agent. The quick-bleaching agent comprises a component I, a component II and a component III, wherein the mass ratio of the component I to the component II to the component III is 1: 1: 2; The component I comprises a fiber amorphous region channel expanding agent accounting for 88% of the total mass of the component I, and the balance of water; the fiber amorphous region channel expanding agent comprises the following components in percentageby mass: 30-40% of benzyl benzoate, 10-15% of diethylene glycol phthalate or dipropylene glycol phthalate, 20-25% of dibutyl maleate, 15-25% of fatty alcohol-polyoxyethylene ether and 5-10% of ethylene glycol butyl ether; the component II comprises a dispersing agent accounting for 9-12% of the total mass of the component II and the balance of water; and the component III comprises a dye antioxidant accounting for 25-30% of the total mass of the component III and the balance of water. The preparation method is simple and feasible; a large amount of water can be reduced by adopting the quick-bleaching agent for printing and dyeing, the cost is reduced, and energy conservation and environmental protection are achieved.
Owner:绍兴集宇化工科技有限公司
Method for pretreating oil sludge waste in hazardous waste incineration disposal
InactiveCN108844072AAdded post-processing stepsGuaranteed dosageIncinerator apparatusPretreatment methodOil sludge
The invention discloses a method for pretreating oil sludge waste in hazardous waste incineration disposal. The method comprises the steps that oil sludge model waste, lime and water are taken, the lime is ground through crushing equipment, the oil sludge model waste and the ground lime are mixed, water is added for stirring in the mixing process, and a mixed body is prepared; the mixed body is placed in a reaction still to be boiled, and elemental sulfur in the oil sludge model waste is converted into polysulfide; and the boiled material in the reaction still is taken out, pretreatment is completed, in the pretreatment process, the lime, the water and the oil sludge model waste react together to generate the polysulfide, then the situation that in the later treatment process, sulfide is heated to generate sulfur dioxide gas is effectively avoided, and meanwhile in order to enable the elemental sulfur in the oil sludge model waste to be completely converted, the amount ratio of the lime, the water and the oil sludge model waste is controlled. According to the method, the process is added in the waste pretreatment process, and sulfur dioxide gas can be prevented from being generatedlater.
Owner:XINZHONGTIAN ENVIRONMENTAL PROTECTION +1
Glass processing production line
PendingCN114230164AFast loading operationImprove transfer efficiencyCharge manipulationGlass severing apparatusManufacturing lineMachining
The invention relates to a glass processing production line. The glass processing production line comprises a feeding unit, a cutting and breaking unit and a CNC processing unit which are arranged in sequence, the feeding unit comprises a feeding rack, a first moving arm, a second moving arm and a glass adsorption mechanism; the glass adsorption mechanism is used for adsorbing to-be-processed glass from the glass conveying mechanism, and the first moving arm and the second moving arm are used for driving the glass adsorption mechanism to move from the glass conveying mechanism to the cutting and breaking-off unit or move from the cutting and breaking-off unit to the CNC processing unit; the CNC machining unit is provided with a sealing shell, and the side wall of the feeding side of the sealing shell is provided with a transverse glass feeding port and an operation channel used for operation of the second moving arm. According to the glass processing production line, manual intervention of middle procedures is reduced, and automation of the whole process from feeding to discharging after processing of large-size glass is achieved.
Owner:广东科杰技术股份有限公司
Method for determining total nitrogen content based on ion chromatography technology
InactiveCN110736804AGood precisionReduce preprocessing stepsComponent separationStandard curvePotassium persulfate
Owner:四川蓝城检测技术有限公司
A method for ultrasonically assisted conversion of chitin into chitosan
Owner:ZHEJIANG UNIV +1
Hybrid protein rapid enzymolysis method
InactiveCN101457247BShorten the timeReduce preprocessing stepsMaterial analysis by electric/magnetic meansFermentationHybrid proteinBiology
The invention relates to a method for fast enzymolysis of hybrid proteins comprising: providing protein samples to be enzymolysis; obtaining the denatured protein samples after the degeneration treatment of said protein samples; treating said denatured protein samples by means of protease enzymolysis and assistant with ultrasonic, obtaining the protein polypeptide fragments. The invention also provides a method for fast identifying the protein. The method of the invention can quickly and high efficiently implement the protein enzymolysis and identification with easy operation and high accuracy.
Owner:EAST CHINA UNIV OF SCI & TECH
Method for ultrasonic assisted conversion of chitin into chitosan
The invention discloses a method for ultrasonic assisted conversion of chitin into chitosan. The method comprises the following steps: (1) adding deionized water into lucid ganoderma spore powder, carrying out ultrasonic extraction in a water bath, then adding ethanol, carrying out ultrasonic extraction at a room temperature, carrying out centrifuging, then carrying out soaking with deionized water, and carrying out centrifuging and drying so as to obtain crude chitin; (2) placing the crude chitin in a H2O2 aqueous solution, maintaining the water bath until decolorizing of the crude chitin iscompleted, adjusting a pH value of a decolorized chitin solution to neutral with a NaOH solution, and carrying out centrifuging so as to obtain a precipitate; and (3) adding an alkali solution into the precipitate, subjecting a mixed solution to ultrasonic treatment so as to complete a deacetylation reaction, adjusting a pH value of an obtained solution to neutral with a HCl solution, then carrying out centrifuging so as to obtain a precipitate, and carrying out drying so as to obtain a crude chitosan product. The method provided by the invention uses NaOH with a small amount and a low concentration and combines an ultrasonic process to prepare the chitosan at a room temperature; in addition, the method fully utilizes residue by-products, broadens the source of the chitosan, and is applicable to scale production of the chitosan.
Owner:ZHEJIANG UNIV +1
Method for detecting nitrofuran metabolite residues in chicken ossein and chicken bone white soup
InactiveCN111175417AEasy to operateReduce preprocessing stepsComponent separationBiotechnologyMetabolite
The invention discloses a method for detecting nitrofuran metabolite residues in chicken ossein and chicken bone white soup. The method comprises steps of (1) weighing a sample; (2) adding diatomite for grinding treatment; (3) adding extracting solution into the treated sample, and uniformly mixing; (4) carrying out derivatization treatment; (5) adjusting a pH value to about 7.2-7.5 by using acidand alkali; (6) extracting with ethyl acetate, and collecting extraction solution; and (7) carrying out 40 DEG C nitrogen blow-drying of the extract, and allowing 0.1% formic acid water to pass through a film machine at a constant volume for detection. The detection method of nitrofuran metabolite is simple, and pretreatment is convenient and efficient.
Owner:山东中质华检测试检验有限公司
A method for screening active ingredients of traditional Chinese medicine based on three-phase laminar flow microfluidic chip
ActiveCN109856278BAvoid adsorptionReduce mistakesComponent separationLaboratory glasswaresBiochemical engineeringBULK ACTIVE INGREDIENT
Owner:云浮市厚德中药饮片有限公司
Double digital PCR fluorescent quantitative detection method for transgenic maize 3272
InactiveCN105112537AReduce preprocessing stepsAvoid adverse effects on accuracyMicrobiological testing/measurementDNA/RNA fragmentationFluorescencePcr method
Owner:CHINESE ACAD OF INSPECTION & QUARANTINE
Process for preparing aminoanisol and aniline by using mixture of nitroanisole and nitro chlorobenzene as raw materials
ActiveCN101307000BReduced conversion rate requirementsEasy to separateOrganic compound preparationAmino compound preparationDistillationOil phase
The invention relates to a process for preparing aminoanisole and aniline by taking a mixture of a nitroanisole and nitrochlorobenzene as a raw material. The process comprises the following: (1) a step of the catalytic hydrogenation reaction and the catalytic dechlorination reaction, during which, methanol is taken as a solvent, the mixture of the nitroanisole and the nitrochlorobenzene is taken as the raw material, catalyst is added, hydrogen is aerated; (2) a step of the solid-liquid separation, during which, solid and liquid in the material obtained from the step (1) after the catalytic hydrogenation reaction and the catalytic dechlorination reaction are separated, a liquid phase comprises aminoanisole, aniline, methanol, hydrochloride and water and is utilized in the next step; (3) a step of the liquid-liquid separation, during which, the oil phase-water phase liquid-liquid separation is performed in the material obtained in the step (2), the aminoanisole and aniline in the oil phase is utilized in the next step; (4) a step of distillation separation, during which, the distillation separation is performed in the oil phase to produce products of paraphenetidine, ortho-anisidineand aniline. The process for preparing the aminoanisole and the aniline has the advantages that: (1) the cost is low, the preliminary treatment step is saved, the process is simple; (2) the process is clean, the energy consumption is low, the 'three wastes' are little; (3) the purity of the product is high.
Owner:江苏仁欣化工股份有限公司
Method for detecting concentration of cycloserine in bone tuberculosis specimens
ActiveCN110824039AShorten the timeEasy extractionComponent separationPreparing sample for investigationBone specimenFluid phase
The invention discloses a method for detecting the concentration of cycloserine in bone tuberculosis specimens. The method includes the following steps: (1) the bone tuberculosis specimens are frozenby liquid nitrogen, after the liquid nitrogen is volatilized, a solvent is added for grinding and cycloserine extraction is conducted, and a tissue extraction solution is collected; (2) the tissue extraction solution and a cycloserine standard solution are detected through high performance liquid chromatography-mass spectrometry combination, and during measuring, if the retention time of a chromatographic peak of the tissue extraction solution is consistent with the retention time of a chromatographic peak of the cycloserine standard solution, selected qualitative ions all occur in a sample mass spectrum after background subtraction, and the abundance is consistent compared with the ion abundance of the cycloserine standard solution, and it is judged that the cycloserine is detected; and (3), according to data, obtained in the step (2), of the tissue extraction solution measured through high performance liquid chromatography-mass spectrometry combination, the content of the cycloserinein the bone tuberculosis specimens is quantitatively analyzed through an internal standard method, and thus the concentration of the cycloserine in the bone tuberculosis specimens is obtained. According to the method, the time of processing the bone specimens is shortened, and the measurement concentration is accurate.
Owner:BEIJING TUBERCULOSIS & THORACIC TUMOR RES INST +1
Double digital PCR fluorescent quantitative detection method for transgenic maize NK603
InactiveCN105112536AReduce preprocessing stepsAvoid adverse effects on accuracyMicrobiological testing/measurementDNA/RNA fragmentationFluorescencePcr method
The invention provides a double digital PCR fluorescent quantitative detection method for transgenic maize NK603. According to the method, quantitative detection can be directly performed on the transgenic maize NK603 in genomes of samples to be detected, and therefore the standard curve plotting step in quantitative detection of a conventional PCR method and the sample preprocessing step in existing digital PCR detection are omitted; in addition, transgenic ingredients are calculated according to the proportion of the exogenous gene copy number and the reference gene copy number, and therefore the stability of quantitative detection of the transgenic ingredients can be improved by performing double detection on one reaction system. Through the method, absolute quantitative detection on the transgenic maize NK603 can be achieved, the quantitative detection limitation can reach 0.5%, the sensitivity can reach 0.1%, and the requirements of actual detection of all the transgenic ingredients can be met. In addition, the method is easy to operate and high in flexibility and serves as an effective method for absolute quantitative detection of transgenes.
Owner:CHINESE ACAD OF INSPECTION & QUARANTINE
Box-packed fruit and vegetable low-temperature plasma airflow type cold sterilization device
PendingCN113229354AIncrease sample sizeReduce preprocessing stepsFruit and vegetables preservationCold chainThermodynamics
The invention provides a box-packed fruit and vegetable low-temperature plasma airflow type cold sterilization device which comprises a box body used for containing fruits and vegetables; a plasma airflow generator which is positioned right above the box body and is used for generating low-temperature plasma airflow; a fan which is positioned right above the plasma airflow generator and is used for blowing the low-temperature plasma airflow into the box body; a flow guide body which is installed at the bottom of the plasma airflow generator and used for guiding plasma airflow to the surfaces of fruits and vegetables. The flow guide body is enclosed into a closed structural body, the bottom of the flow guide body is open and gradually contracts towards the inner side, and the bottom of the flow guide body extends into the box body; and an air outlet gap is reserved between the outer wall of the flow guide body and the box body, so that low-temperature plasma airflow flows back upwards from the bottom of the box body and flows out from the air outlet gap. The device can significantly increase the sample size and reduce the pretreatment steps, and can be used for external sterilization of the cold-chain logistics packaging box, so that the device can meet the requirements of large-scale production of fruits and vegetables in a cold-chain link.
Owner:南京苏曼等离子工程研究院有限公司 +1
Multi-medicinal fast thin-layer identification method and containing device for reference materials of rehmannia and lycium root-bark decoc
PendingCN110806459AEasy to prepareFast preparation methodComponent separationMedicinal herbsRehmannia
An embodiment of the invention discloses a multi-medicinal fast thin-layer identification method and a containing device for reference materials of rehmannia and lycium root-bark decoc, and the identification method comprises the following steps of preparation of a control medicinal solution, preparation of two test solutions, and chromatographic detection and comparison of the test solutions andcorresponding control medicinal solution. The containing device comprises a cooling tank, a containing tank provided inside the cooling tank and used for containing the reference materials of rehmannia and lycium root-bark decoc, and a stirring structure rotatably provided inside the containing tank. In the invention, the adopted preparation method of two test solutions is simple and fast, and requires fewer pre-processing steps; at the same time, in the identification of five medicinal materials, the solvents in the test solutions and the reference medicinal solution only involve methanol orwater, so that the cost of the entire preparation method is effectively reduced, and the detection efficiency is greatly improved; compared with a conventional thin-film identification corresponding to a traditional medicinal material, the material is classified in the invention to further reduce the number of times of thin-layer identification, thereby realizing a new model of one test and multiple evaluations, and better improving the identification efficiency.
Owner:SHAN DONG DONG E E JIAO
Preparation method of micron-sized spherical particle section for electron microscope observation
ActiveCN112858362AIncrease the effective areaReduce preprocessing stepsMaterial analysis using wave/particle radiationPreparing sample for investigationMicron scaleIon beam
The invention discloses a preparation method of a micron-sized spherical particle section for electron microscope observation. The preparation method comprises the following steps: (1), adhering a conductive adhesive tape to a conductive metal matrix; (2), taking micron-sized spherical particle powder to be flatly laid and adhered to the conductive adhesive tape, and blowing away redundant powder; and (3), placing the conductive metal matrix adhered with the powder in an ion beam polishing machine to be polished, using a plane polishing mode, the polishing angle being 0-2 degrees, the polishing voltage and time being 5-8 kV for 5-40 min, 3-5 kV for 5-20 min and 0.5-2 kV for 5-20 min; and obtaining the particle cross section meeting the scanning electron microscope observation requirement. According to the method, embedding treatment is not needed, and extra sample preparation consumables are not consumed; time is short, cost is low, and operability is high; the consumed time is only one tenth of that of a section polishing mode, and the polishing efficiency is high; the effective area of the obtained sample is large, and the selectable areas for scanning electron microscope observation are more.
Owner:CHONGQING UNIV
A method for detecting cycloserine concentration in bone tuberculosis specimens
ActiveCN110824039BShorten the timeEasy extractionComponent separationPreparing sample for investigationBone specimenFluid phase
The invention discloses a method for detecting the concentration of cycloserine in bone tuberculosis specimens. It includes the following steps: (1) freeze the bone tuberculosis specimen with liquid nitrogen, after the liquid nitrogen volatilizes, add a solvent to grind and extract cycloserine, and collect the tissue extract; (2) use high-efficiency Liquid chromatography-mass spectrometry is used for detection; when measuring, if the retention time of the chromatographic peak of the tissue extract is consistent with that of the cycloserine standard solution, and in the mass spectrum of the sample after subtracting the background, the selected qualifier ions all appear, and the abundance Consistent with the ion abundance ratio of cycloserine standard solution, it is determined that cycloserine is detected; (3) according to the data of the tissue extract determined by the high performance liquid chromatography-mass spectrometry that step (2) obtains, adopt internal standard method to The content of cycloserine in the bone tuberculosis specimen is quantitatively analyzed to obtain the concentration of cycloserine in the bone tuberculosis specimen. The invention shortens the processing time of the bone specimen and measures the concentration accurately.
Owner:BEIJING TUBERCULOSIS & THORACIC TUMOR RES INST +1
Preparation method of titanium oxide extraction bar for solid phase microextraction
InactiveCN101757898BLarge specific surface areaGood chemical stabilityOther chemical processesFiberGas phase
The invention discloses a preparation method of a titanium oxide extraction bar for solid phase microextraction; in the method, a plurality of titanium oxide layers are deposited on the surface of polypropylene hollow fiber by adopting a sol-gel method, and then polypropylene matrix is removed by high-temperature firing, so as to obtain the titanium oxide hollow fiber extraction bar, realize extraction preenrichment to polar compounds with micro and trace amount in medicine and environment samples and carry out separation analysis to gas chromatography or high performance liquid chromatography; the extraction bar has a three-dimensional porous stricture, has larger specific surface area, controllable coating thickness, good chemical and heat stability, wide pH stabilization range (pH=1-14) and high extraction efficiency to the polar compounds.
Owner:LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Detection method of acetylcysteine enantiomer
PendingCN114689707AReduce preprocessing stepsEasy to separateComponent separationChromatographic columnMolecular biology
The invention relates to the technical field of analysis and detection, in particular to a detection method of acetylcysteine enantiomers. The detection method of the acetylcysteine enantiomer provided by the invention comprises the following steps: diluting a sample with a diluent, and carrying out HPLC (High Performance Liquid Chromatography) detection, the diluent is composed of ethanol and isopropanol; chromatographic conditions of the HPLC detection are as follows: a chromatographic column is a chiral column; a mobile phase is composed of normal hexane, isopropanol, ethanol and trifluoroacetic acid, and isocratic elution is carried out. When the method provided by the invention is used for detection, the pretreatment steps of the sample can be reduced. The detection result shows that the method provided by the invention can enable the L-acetylcysteine and the D-acetylcysteine to have better separation degree, and the accuracy, the sensitivity, the repeatability and the precision of the detection are all good.
Owner:SICHUAN HUIYU PHARMA +1
Aluminum formwork wall corner slurry leakage prevention mechanism
PendingCN112049418AImprove water qualityImprove aestheticsAuxillary members of forms/shuttering/falseworksFloor slabSlurry
The invention discloses an aluminum formwork wall corner slurry leakage prevention mechanism. The aluminum formwork wall corner slurry leakage prevention mechanism comprises an embedded assembly, a plugging assembly and a connecting assembly. The bottom wall of the embedded assembly is clamped to a steel bar, and the top wall of the embedded assembly is located below the top wall of a floor slab.The plugging assembly is provided with a leakage prevention section and a connecting flange, a plurality of aluminum formworks are arranged on the connecting flange, the side walls of the aluminum formworks abut against the outer wall of the leakage prevention section to form a pouring groove, the connecting flange is arranged on the peripheral wall of the leakage prevention section and extends towards the radial outer side of the pouring groove, and the bottom wall of the connecting flange is located below the top wall of the floor slab. The connecting assembly is arranged in the embedded assembly and the plugging assembly in a penetrating mode. According to the aluminum formwork wall corner slurry leakage prevention mechanism, the aluminum formwork wall corner slurry leakage phenomenon can be reduced, the construction efficiency is improved, and the construction cost is reduced.
Owner:CHINA HUASHI ENTERPRISES
Pretreatment activation solution and pretreatment method for aluminum and aluminum alloy electroplate
The invention provides a pretreatment activation solution and a pretreatment method for aluminum and aluminum alloy electroplate. The pretreatment activation solution includes the following components: 20-30 g / L of fumaric acid, 3-5 ml / L of hydrofluoric acid, and water as a solvent. The pretreatment method includes the following steps: aluminum and aluminum alloy workpieces are subjected to oil removal and washed with water, then are subjected to alkali corrosion and washed with water, then are subjected to acid pickling and washed with water, are finally activated by the pretreatment activation solution, and then are washed with water after the activation. The pretreatment activation solution contains a composite antioxidant, can improve the bonding strength of aluminum and aluminum alloysurface coatings, and can be directly electroplated after the activation.
Owner:佛山市诺诚科技有限公司
Pretreatment activation solution and pretreatment method for aluminum and aluminum alloy electroplating
The invention provides a pretreatment activation solution and a pretreatment method for aluminum and aluminum alloy electroplating, which include the following components: 20-30 g / L of fumaric acid, 3-5 ml / L of hydrofluoric acid, and water as a solvent. Pretreatment method: degrease and wash the aluminum and aluminum alloy workpieces, then alkali etch and wash, then pickle and wash, and finally activate with the above-mentioned pretreatment activation solution, and rinse with water after activation. The pretreatment activation solution contains composite antioxidants, which can improve the binding force of aluminum and aluminum alloy surface coatings, and can be directly electroplated after activation.
Owner:佛山市诺诚科技有限公司
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