906 results about "Ion chromatography" patented technology

A method for purifying a polypeptide by ion exchange chromatography is described which involves changing the conductivity and / or pH of buffers in order to resolve a polypeptide of interest from one or more contaminants.

Ion manipulation systems include ion repulsion by an RF field penetrating through a mesh. Another comprises trapping ions in a symmetric RF field around a mesh. The system uses macroscopic parts, or readily available fine meshes, or miniaturized devices made by MEMS, or flexible PCB methods. One application is ion transfer from gaseous ion sources with focusing at intermediate and elevated gas pressures. Another application is the formation of pulsed ion packets for TOF MS within trap array. Such trapping is preferably accompanied by pulsed switching of RF field and by gas pulses, preferably formed by pulsed vapor desorption. Ion guidance, ion flow manipulation, trapping, preparation of pulsed ion packets, confining ions during fragmentation or exposure to ion to particle reactions and for mass separation are disclosed. Ion chromatography employs an ion passage within a gas flow and through a set of multiple traps with a mass dependent well depth.

A liquid chromatographic system is provided including catalytically combining hydrogen and oxygen gases in the chromatography eluent stream in a catalytic gas elimination chamber, to form water and thereby reduce the gas content in the eluent stream. Also, a liquid ion chromatographic system in which the effluent from the detector is recycled to a membrane suppressor and then is mixed with a source of eluent for recycle to the chromatographic column.

A resin composition comprising: (1) 100 parts by weight of an aromatic polycarbonate resin (component A); (2) 0.005 to 0.6 part by weight of a fluorine-containing organic metal salt having a fluoride ion content measured by ion chromatography of 0.2 to 20 ppm in terms of weight (component B); and (3) at least one component selected from the group consisting of a flame retardant (component C), a fatty acid ester (component D), an ultraviolet light absorber (component E), polytetrafluoroethylene having fibril formability (component F), a filler (component G), a silicate mineral (component H) and a titanium dioxide pigment (component I). A process of manufacturing the resin compositon and a method of preventing the melt dripping during combustion of the resin composition. The flame retardancy of the above aromatic polycarbonate resin composition comprising the fluorine-containing organic metal salt compound is improved.

The invention discloses compound amino acid injecta, which contains arginine hydrochloride, histidine monohydrochloride, leucine, isoleucine, lysine hydrochloride and the like; meanwhile, the invention further discloses a preparation method of the compound amino acid injecta (18AA); in the event of ensuring the product quality, the compound amino acid injecta has the characteristics of saving energy and enhancing efficacy; by means of repetitive verification on precision, detection limit, quantitation limit, linear range and the like, a simple, convenient, rapid and reliable method with cleaning verification is ensured; furthermore, the residual quantity of antioxygen, namely sodium hydrogensulfite, in the compound amino acid injecta and sulphate ion generated by degrading sodium hydrogensulfite are detected according to an ion chromatography principle, thus, the amount of the antioxygen charged in the raw material proportioning can be accurately measured, and the stability of the raw material proportioning process is judged according to the measurement result; and a detection method of the compound amino acid injecta provided by the invention is an online derivative amino acid content measuring method, the speed is rapid, and the method is applied to large-scale detection.

A method for purifying a polypeptide by ion exchange chromatography is described in which a gradient wash is used to resolve a polypeptide of interest from one or more contaminants.

A method for purifying a polypeptide by ion exchange chromatography is described in which a gradient wash is used to resolve a polypeptide of interest from one or more contaminants.

The present invention pertains to a method of ion chromatography wherein a specialized electrodeionization (EDI) apparatus is used for (1) the preparation of a pure acid or pure base for use as an eluent in a chromatographic separation column and / or (2) for ion suppression (or neutralization) of the acid or base after it has been used to elute ions from a chromatographic separation column. Methods for trace ion removal, acid and base neutralization, and ion suppression using a specialized EDI apparatus are also described. The methods described herein allow for the ion suppression of samples containing chloride, nitrate, and other electrochemically active anions, without causing damage to the suppressor.

A chemical mechanical polishing aqueous dispersion including (A) silica particles, and (B1) an organic acid, the sodium content, the potassium content, and the ammonium ion content of the silica particles (A) determined by ICP atomic emission spectrometry, ICP mass spectrometry, or ammonium ion quantitative analysis using ion chromatography having a relationship in which the sodium content is 5 to 500 ppm and at least one of the potassium content and the ammonium ion content is 100 to 20,000 ppm.

A process of manufacturing the resin compositon and a method of preventing the melt dripping during combustion of the resin composition. The flame retardancy of the above aromatic polycarbonate resin composition comprising the fluorine-containing organic metal salt compound is improved. An aromatic polycarbonate resin composition containing a fluorinated organometal salt compound. The resin composition has improved flame retardancy. The resin composition comprises (1) 100 parts by weight of an aromatic polycarbonate resin (ingredient (A)), (2) 0.005-0.6 parts by weight of a fluorinated organometal salt (ingredient (B)) having a fluoride ion content as measured by ion chromatography of 0.2-20 ppm by weight, and (3) at least one ingredient selected from the group consisting of a flame retardant (ingredient (C)), fatty acid ester (ingredient (D)), ultraviolet absorber (ingredient (E)), polytetrafluoroethylene having fibril-forming ability (ingredient (F)), filler (ingredient (G)), silicate mineral (ingredient (H)), and titanium dioxide pigment (ingredient (I)). Also provided is a method of preventing a resin composition from melting / dripping upon combustion.

An ion chromatography apparatus comprising: (a) a first chromatography column, (b) a second chromatography column, the volume of the second column being no greater than 0.9 times the volume of the first; and (c) valving disposed between said first and second columns permitting selective transfer of separated ionic species from first chamber to second chamber for further analysis.

The present invention provides a new design for high capacity stationary phases for dianion selective ion chromatography. The stationary phases include one or more layers which are products of condensation polymerization. Multiple components are of use in forming the first polymer layer and the condensation polymer structure, thereby providing a stationary phase that can be engineered to have a desired property such as ion capacity, ion selectivity, and the like. Exemplary condensation polymers are formed by the reaction of at least one polyfunctional compound with at least one compound of complimentary reactivity, e.g., a nucleophilic polyfunctional compound reacting with an electrophilic compound.

The present invention provides a pressure-sensitive adhesive sheet including at least one pressure-sensitive adhesive layer formed of a pressure-sensitive adhesive composition containing an acrylic polymer (a) in which the total content of acrylic acid and methacrylic acid relative to the entire monomer ingredients constituting the acrylic polymer is 10% by weight or less, in which the total amount of an acrylic acid ion and a methacrylic acid ion extracted from the pressure-sensitive adhesive sheet with pure water under the condition of 100° C. for 45 minutes, as measured in accordance with an ion chromatography, is 20 ng / cm2 or less per the unit area of the pressure-sensitive adhesive layer.

The invention relates to an ion chromatography single-pump column switching system which mainly comprises a pump, a guard column, an analytical column, a suppressor, a conductivity detector, a sample loop, a ten-way valve, an ion exclusion column, a waste liquid barrel, a six-way valve, an enrichment column and other parts, wherein the pump is connected with the six-way valve; the enrichment column is connected on the six-way valve; the six-way valve is respectively connected with the guard column, the ion exclusion column and the waste liquid barrel; the analytical column is respectively connected with the guard column and the suppressor; the suppressor is respectively connected with the analytical column and the conductivity detector; the sampling loop is connected on the ten-way valve; and the ten-way valve is respectively connected with a conductivity flow cell, the conductivity detector, the ion exclusion column and the waste liquid barrel. The ion chromatography single-pump column switching system can ensure the analytical effect of conventional anions and realize the separation and the monitoring of the conventional anions in a high-concentration organic acid substrate by using one ion chromatography instrument, as well as simultaneously simplify the technological process, reduce chromatography accessories and save solvent consumption.

The present invention provides a thin polarizing film which has only a small environmental load and has excellent optical characteristics.The thin polarizing film is produced by forming a polyvinyl alcohol-based resin layer on a thermoplastic resin substrate. The thin polarizing film has a thickness of 10 μm or less, a single axis transmittance of 42.0% or more, a polarization degree of 99.95% or more, and an iodine content of 17.6 grams per 400×700 square millimeters or less, which is measured by an ion chromatography method.

The invention discloses a method for measuring ammonia content in cigarette smoke through ion chromatography. The method comprises the steps that an F319-04 filter leaf and an absorption bottle gather ammonia in main stream smoke, extract liquor is added to extract particulate matter in the F319-04 filter leaf, moderate extract liquor is mixed with absorption liquid in the absorption bottle, volume metering is conducted, an aqueous phase filter is used for filtering the mixed liquid, and an ion chromatograph is introduced to conduct measuring, wherein the extract liquor is aldehyde with strong acid. Filter leaf extraction is conducted by the aldehyde solvent with the strong acid, and therefore the stability of ammonia detection liquid can be effectively improved. The method for measuring the ammonia content in the cigarette smoke through the ion chromatography can measure the ammonia content in the sample solution accurately and fast through the ion chromatography, and is suitable for measurement of the ammonia content in large numbers of cigarette samples, good in practicability and beneficial to deep harm-reduction and tar-reduction research.

A methoxy polyethylene glycol (mPEG) modified insulin compound is prepared from INS protein (insulin) and methoxy polyethylene glycol derivative through modifying reaction to obtain the solution of coarse product, ion exchange chromatography, collecting, centrifugal ultrafiltering, concentrating, and freeze drying to obtain high-purity product.

The present invention provides a method for preparing nanometer micron composite spheres, a nanometer particle having surface function group is linked to the specialised spheres surface by chemical method, so as to prepare stable nanometer micron composite spheres, and enhance the application and life of the composite spheres, these nanometer micron composite spheres are used for high-effect ion chromatography fillings, biomolecule separation and analyzing medium, cell separating magnetic spheres, catalyst and zymophore, diagnostic reagent, medical controlled released carrier etc.

A fitting assembly is provided having a nut and a ferrule, which in certain embodiments may be assembled by an operator. The nut and ferrule of the fitting assembly have passageways therethrough for receiving and removably holding tubing. The nut and ferrule fitting assembly may be adapted for use with a flat bottom port, such as in an analytical instrument, like liquid chromatography, gas chromatography, ion chromatography, or in in vitro diagnostic systems.

The invention discloses a method for measuring trace chloridion and sulfate radical in loprazolam samples by ion chromatography and belongs to the field of analytic chemistry. The method includes the followings steps of preparing and analyzing Cl- and SO42- mixed standard solution and obtaining a linear equation of concentration and peak area, pretreating the loprazolam samples, feeding the treated loprazolam samples to an ion chromatography by a disposable needle type filter, utilizing 3.6mmol / L sodium carbonate as leacheate and analyzing and measuring the content of the chlorodion and the sulfate radical according to the obtained linear equation, wherein a chromatographic column adopted in the ion chromatography is a high-capacity chromatographic column, the inner diameter of filler of the chromatographic column is 5 micrometers, the temperature of a column temperature box is set to be 45 DEG C, sampling input quantity is 100 microliters, applied curb current is 40mA, and flow velocity is 0.8ml / min. The method is quick and simple, high in accuracy, convenient and easy to operate and applicable to quality control in the process of production of loprazolam, the integral analyzing process can be completed within 25min, and the detection requirements of the fine chemical industry are met.

An ion chromatogram method uses to test the lithium salt (LiPF6) concentration in lithium ion battery electrolyte. (1) Prepare F- and PO43- standard solution in different concentration and test in ion chromatogram method to protract C-A standard curve. (2) Add reverse chloroazotic acid into the need test electrolyte in equal volume and stay for 12-24 hours, then dilute the solution with secondary deionwater step by step and control its concentration inside the concentration range of standard curve. Test the concentration to F- and PO43- in ion chromatogram method at the same condition with step (1). (3) Calculate the lithium salt concentration C1 of the sample in formula (a) according the concentration to F-, calculate the lithium salt concentration C2 of the sample in formula (b) according the concentration to PO43-. It can test the lithium salt concentration according the concentration to F- and PO43- at the same time, and the data of the two groups complement and consult with each other with high veracity.

A sandwich suppressor in an ion chromatography system in which loosely packed ion exchange resin of low density is disposed in the central sample stream flow channel. Also, a method of using the suppressor is described.

The invention relates to a resin filling type ion chromatography electrolysis self-regeneration suppressor which is capable of analyzing materials by utilizing electrolysis, electro-osmosis and iron exchange and is used for eliminating countra-ion in a solution and lowering background conductance of a leacheate. The middle layer of the resin filling type ion chromatography electrolysis self-regeneration suppressor provided by the invention is fiber adding and hardening silicon sheet or bulk four-fluorine belt materials. In the vertical direction of a splint, two splint electrolysis chamber flow guide slots are staggered, and the liquid enters into the suppressor from one side, so that the technical problems that the middle layer of the existing resin filling type ion chromatography electrolysis self-regeneration suppressor has strict requirements to the filling materials are solved, the internal chambers are reduced, and base lines and peak shapes are influenced, so that the liquid among layers is easy to leak, and redundant filling materials are extruded so as to cause the sealing difficulty.

There are provided a catalyst for catalytic gas phase oxidation of acrolein with molecular oxygen to produce acrylic acid, the catalyst including molybdenum and vanadium and further including at least one volatile catalyst poison ingredient in an amount of 10 to 100 ppb by mass as measured by ion chromatography; and a process for producing acrylic acid, including a step of carrying out catalytic gas phase oxidation of acrolein with molecular oxygen using the catalyst. The catalyst of the present invention can lower a hot spot temperature and suppress reduction in a reaction efficacy accompanied with thermal degradation, so that the acrolein conversion can stably be kept higher over a long term.

An apparatus for ion chromatography comprising a suppressor comprising a housing and a liquid conduit segment disposed in the housing, the liquid conduit segment including a membrane, the membrane having an inlet section adjacent the inlet of the conduit segment and an outlet section adjacent the outlet of the conduit segment, the inlet section having ion exchange sites capable of transmitting ions of one charge, positive or negative, and the outlet section being substantially non-retentive electrostatically for charged ionic species. Also, the method of using the apparatus.

The invention discloses a method for simultaneously determining inorganic anions and organic acid radical ions in salt lake brine. The method is characterized by preprocessing a certain quantity of samples of the salt lake brine, simultaneously separating and determining 6 types of inorganic anions comprising F<-1>, Cl<-1>, NO2<-1>, Br<-1>, NO3<-1> an SO4<2-> and 3 types of organic acid radical ions comprising CH3COO<-1>, HCOO<-1> and C2O4<2-> in the salt lake brine by carrying out secondary gradient elution through an ion chromatography. The result shows that the method is simple and convenient, high in accuracy and capable of providing the important reference basis for simultaneously separating and determining a plurality of anions in the salt lake brine and exploring resources of the salt lake.

A torque limiting tool is provided that has a handle and a body, which in certain embodiments may be assembled by an operator. The body of the torque limiting tool has a side portion with a tubing slot for allowing tubing to exit the torque limiting tool. The handle and body have one or more abutments, designed to allow the torque limiting tool to deliver a maximum amount of torque. The torque limiting tool may be used with an adapter to allow coupling with a variety of fitting sizes and shapes. The torque limiting tool may be adapted for use with a flat bottom port, such as in an analytical instrument, like liquid chromatography, gas chromatography, ion chromatography, or in in vitro diagnostic systems.

The invention discloses a method and a device for measuring SOx in fire coal fume. The method comprises the following steps of: a. sampling fire coal fumes, wherein the temperature for sampling is kept the same as that of the fire coal fume in a flue during the process; b. cooling by using a condenser and absorbing SO3 in the fumes, wherein the temperature is controlled within 75-85 DEG C during the process; c. carrying out the oxidation absorption on the fumes, eliminating the moisture in the fumes, and simultaneously controlling to ensure a stable fume flow; and d. respectively detecting the content of SO3 absorbed by the condenser during the cooling and the content of SO2 after the oxidation absorption. According to the method, the temperature while the fume is sampled is kept the same as that in the fume constantly, so the secondary reaction of SO3 is avoided; and meanwhile the fly ash in the fume is isolated, and the accuracy of the flow, temperature and pressure for the fume sampling can be ensured; and moreover a high precision iron chromatography method is adopted for the measurement, so that the method is higher in measuring precision, and the error is reduced.