Gotowe bibliografie tematyczne / Ion exchange chromatography

Gotowa bibliografia na temat „Ion exchange chromatography”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 30 lipca 2024

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Artykuły w czasopismach na temat "Ion exchange chromatography"

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Ghatak-Roy, Amiya R., i Charles R. Martin. "Electromodulated ion exchange chromatography". Analytical Chemistry 58, nr 7 (czerwiec 1986): 1574–75. http://dx.doi.org/10.1021/ac00298a070.

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Sellergren, Börje, i Kenneth J. Shea. "Chiral ion-exchange chromatography". Journal of Chromatography A 654, nr 1 (listopad 1993): 17–28. http://dx.doi.org/10.1016/0021-9673(93)83061-v.

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SHIBUKAWA, Masami, Ryota MORINAGA i Shingo SAITO. "Superheated Water Ion-exchange Chromatography". Bunseki kagaku 65, nr 11 (2016): 615–23. http://dx.doi.org/10.2116/bunsekikagaku.65.615.

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Milby, Kristin H., Sa V. Ho i Jay M. S. Henis. "Ion-exchange chromatography of proteins". Journal of Chromatography A 482, nr 1 (styczeń 1989): 133–44. http://dx.doi.org/10.1016/s0021-9673(01)93214-5.

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Sarwar, Ghulam, Herbert G. Botting i Robert W. Peace. "Complete Amino Acid Analysis in Hydrolysates of Foods and Feces by Liquid Chromatography of Precolumn Phenylisothiocyanate Derivatives". Journal of AOAC INTERNATIONAL 71, nr 6 (1.11.1988): 1172–75. http://dx.doi.org/10.1093/jaoac/71.6.1172.

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Abstract The amino acid analysis method using precolumn phenylisothiocyanate (PITC) derivatization and liquid chromatography was modified for accurate determination of methionine (as methionine sulfone), cysteine/cystine (as cysteic acid), and all other amino acids, except tryptophan, in hydrolyzed samples of foods and feces. A simple liquid chromatographic method (requiring no derivatization) for the determination of tryptophan in alkaline hydrolysates of foods and feces was also developed. Separation of all amino acids by liquid chromatography was completed in 12 min compared with 60-90 min by ion-exchange chromatography. Variation expressed as coefficients of variation (CV) for the determination of most amino acids in the food and feces samples was not more than 4%, which compared favorably with the reproducibility of ion-exchange methods. Data for amino acids and recoveries of amino acid nitrogen obtained by liquid chromatographic methods were also similar to those obtained by conventional ion-exchange procedures.
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Kato, Yoshio, Shigeru Nakatani, Takashi Kitamura, Akane Onaka i Tsutomu Hashimoto. "High-performance ion-exchange chromatography of peptides on a pellicular ion exchanger". Journal of Chromatography A 513 (styczeń 1990): 384–88. http://dx.doi.org/10.1016/s0021-9673(01)89461-9.

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Cooper, J. D. H., D. C. Turnell, B. Green, D. J. Wright i E. J. Coombes. "Why the Assay of Serum Cystine by Protein Precipitation and Chromatography Should Be Abandoned". Annals of Clinical Biochemistry: International Journal of Laboratory Medicine 25, nr 5 (wrzesień 1988): 577–82. http://dx.doi.org/10.1177/000456328802500516.

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The higher bias of serum cystine estimations by a HPLC method compared with those by ion exchange techniques is shown to be largely due to differences in the sample preparation procedures of the two techniques. The ion exchange methods utilised sulphosalicylic acid serum protein precipitation and post-column ninhydrin derivatisation of cystine, whilst the high pressure liquid chromatography technique employed automated dialysis for removal of proteins and pre-column ortho-phthalaldehyde derivatisation of cystine after its conversion to cysteine and then to S-carboxymethylcysteine. Examination of these procedures showed that whilst the high pressure liquid chromatographic method accurately estimates total serum cystine and cysteine, many factors affect the precision and accuracy of serum cystine estimations using the ion exchange techniques. In particular, serum protein precipitation techniques that are currently employed for the preparation of samples for cystine analysis by ion exchange chromatography should be abandoned.
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Schmuckler, Gabriella. "High-Performance Liquid Ion-Exchange Chromatography". Journal of Liquid Chromatography 10, nr 8-9 (czerwiec 1987): 1887–901. http://dx.doi.org/10.1080/01483918708066804.

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Lettner, H. P., O. Kaltenbrunner i A. Jungbauer. "HETP in Process Ion-Exchange Chromatography". Journal of Chromatographic Science 33, nr 8 (1.08.1995): 451–57. http://dx.doi.org/10.1093/chromsci/33.8.451.

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Nakamura, Koji, i Yoshio Kato. "Preparative high-performance ion-exchange chromatography". Journal of Chromatography A 333 (styczeń 1985): 29–40. http://dx.doi.org/10.1016/s0021-9673(01)87322-2.

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Rozprawy doktorskie na temat "Ion exchange chromatography"

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Polite, Lee Nicholas. "Studies in ion exchange chromatography". Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/54338.

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This dissertation investigates three major problems in IC, ranging from the practical to the theoretical. The first is of interest to the field of quantitative analysis. Since ion chromatography is primarily a quantitative technique, the linear range of the detector is of particular interest. The linear range was determined to be nearly five orders of magnitude for several common ions. The probes used were fluoride, chloride, sulfate, sodium, and potassium with concentrations ranging from 10 ppb to 1000 ppm. This portion of the dissertation describes the first attempt made to elucidate the linear detection range in ion chromatography using micro-membrane suppression. The Iinearity experiments demonstrate the versatility of ion chromatography with respect to quantifiable concentrations. However, a major problem is encountered when attempting to determine a trace ion concentration in the presence of a high concentration of a similarly charged ion (matrix ion). The second part of this dissertation offers a solution to this problem. In ion chromatography, the large excess of a matrix ion affects not only the ions expected in that region of the chromatogram, but also destroys the chromatographic exchange process. One objective of this study was to develop a rapid quantitative method to determine 5 ppm chloride in the presence of 100,000 ppm sulfate. A standard anion exchange column will completely lose resolution between chloride and sulfate at a sulfate concentration of approximately 2500 ppm. The apparatus designed and built by the author uses two analytical ion—exchange columns coupled in series by a high pressure switching valve. ln order to complete the system, the author designed and built y a high pressure conductivity detector cell to monitor the conductivity of the effluent from the first column. The system works by overloading the first column and then allowing the effluent to pass onto the second column. When the trace chloride in on the second column, the first column is switched out of line. This process allows the trace chloride to be separated from the residual sulfate. The column switching study brought to light several theoretical questions about the inner workings of the packing materials used in ion chromatography. These questions include the effects that flow rate and temperature have on capacity and efficiency in ion chromatography separations. Using chloride and sulfate as probes, the chromatographic efficiency was shown to decrease from 30° to 60° C. Even more surprising was the result that sulfate retention increased with increasing temperature while chloride retention decreased under the same conditions. Detailed studies as well as possible explanations are included in the third part of this dissertation.
Ph. D.
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Cao, Liming. "Protein Separation with Ion-exchange Membrane Chromatography". Link to electronic thesis, 2005. http://www.wpi.edu/Pubs/ETD/Available/etd-050405-174109/.

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Maketon, Supachai. "Methods Development for Ion Chromatography". Thesis, North Texas State University, 1986. https://digital.library.unt.edu/ark:/67531/metadc330927/.

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Ion chromatography (IC) as developed by Small et. al. in 1975 has become an efficient and reliable analytical technique for simultaneous analysis of multiple ions in solution. The principle requirement prior to use the IC for an analysis is sample preparation; these include sample decomposition, solvent extraction, and trapping in case the target element is in the gas phase, etc. Solvent extractions for fluoride, chloride, sodium, ammonium, and potassium ions which are soluble in soils are described. Sample decompositions include silicate rocks using hydrofluoric acid for the determination of phosphorus; organic pesticides using lithium fusion technique for the determination of halide and cyanide ions are also described. After these sample preparation techniques, the aqueous solutions obtained were analyzed on the ion chromatograph for the analyses of the anions and cations mentioned above. Recovery and reproducibility of each technique is in general quite good and the comparison between the results obtained from the IC method and other instrumentation are given.
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Forrer, Nicola. "Antibody purification with ion-exchange chromatography". Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17784.

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Galindo, Irma C. (Irma Concepcion). "Investigation Into the Causes for the Loss of Resolution in an Ion Chromatograpy Resin". Thesis, North Texas State University, 1988. https://digital.library.unt.edu/ark:/67531/metadc798197/.

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Four mechanisms were considered as possible causes of the loss in resolution for a Dionex CG2 ion chromatography resin: 1) presence of inorganic ions strongly bound to the active sites; 2) adsorption of organic species; 3) physical alterations; and 4) chemical alterations. The instrumental analyses used to gather data were ICP, FT-IR, SEM, solid C-13 NMR and IC. Based on the results, no metal ions are bound to the resin, no organic species are held onto the resin, and no physical change was observable. The cause for the loss of resolution is a strong reduction in the number of active sites in the resin as confirmed by elemental analysis for the sulfur in the sulfonic acid present in the active sites.
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Pearson, C. H. G. "New ion exchange resins for ion chromatography applied to anions". Thesis, University of Kent, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372771.

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Allyn, M. Liz. "Indirect photometric chromatography of iodide ion in aqueous solutions /". Online version of thesis, 1987. http://hdl.handle.net/1850/8769.

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Huang, Julie Shiong-Jiun. "Ion Chromatography of Soluble Cr(III) and Cr(VI)". Thesis, University of North Texas, 1988. https://digital.library.unt.edu/ark:/67531/metadc500410/.

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Ion chromatography coupled with a conductivity detector was used to investigate the analysis of Cr(III) and Cr(VI) in aqueous samples. An IC methodology for Cr(III) was developed using a cation column and an eluent containing tartaric acid, ethylenediamine, and acetonitrile at pH 2.9. The detection limit of this method can reach 0.1 ppm level with good precision. Several operational parameters were evaluated during the regular use of the method. Comparison of the IC method with AA method showed good agreement between the two methods. The anion exchange column was used for Cr(VI) determination. The best results were obtained with an eluent containing sodium gluconate, borate buffer, glycerin, and acetonitrile. The retention time for the Cr207 2 - sample was 11 min. and the calibration curve was linear between 1.0 and 100 ppm.
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Borghi, Andrea. "Cellulose hollow fibers membranes for ion-exchange chromatography". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20289/.

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The development of an efficient and cost-effective purification process is the objective of protein separation. Usually, the most common procedure is chromatography, typically performed in a packed bed column; however, the cost is relatively high. Nowadays, one of the most interesting and promising method is the employment of particular membranes, the hollow fibers, in the standard chromatographic operations. Hollow fibers membranes were developed in the 1960s, specifically for reverse osmosis; nonetheless, they are now largely applied in both liquid and gaseous applications. In this project, the preparation of cellulose hollow fibers, exploited for ion-exchange chromatography, was studied during a five months internship at the King Abdullah University of Science and Technology (KAUST) in the group of Professor Suzana Nunes. The hollow fibers were prepared, dissolving cellulose in 1-Ethyl-3-methylimidazolium diethyl phosphate (EMIM DEP), an ionic liquid commonly used as green solvent for cellulose. After a first research, regarding the performance of flat sheet membrane obtained by phase inversion, in which permeance and rejection were investigated using bovine serum albumin (BSA), the second phase of the project was the optimization of cellulose hollow fibers. Steps of the procedure included: a prior functionalization and application in ion-exchange chromatography. Ion exchange hollow fibers were, indeed, prepared reacting the cellulose with 1,4-butane sultone, and checked for proper functionalization by FTIR. The ion-exchange fibers were primarily characterized in bind and elute mode using pure lysozyme solutions. The Tris buffer, chosen for equilibration and adsorption, was optimized in terms of molarity and pH. The values of static binding capacity resulted in promising and comparable to that of the commercial ion-exchange membrane.
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McCannel, Anne Marie. "Separation of immunoglobulins from egg yolk using metal chelate interaction chromatography and ion exchange chromatography". Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/27987.

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The immune response of chickens immunized with β-N-acetylglucosaminidase was monitored in the egg yolks of the birds using an enzyme-linked immunosorbent assay. Significantly higher levels of specific antibodies were detected in the yolks of the birds immunized with the enzyme when compared with the yolks of a control bird collected over the same period significant differences also were found in the response within the immunized group of birds, indicating individual variability to the injections. Immunoglobulins were isolated from egg yolk after a preliminary purification using alginate to precipitate lipoproteins. A ten millilitre DEAE-Sephacel ion exchange chromatography column resulted in a final product containing 16 mg of IgG with a purity of 60% when 50 mL of an egg yolk supernatant was applied. Specific antibody activity toward the antigens β-lactoglobulin and E. coli lipopolysaccharide was higher in both cases in the isolated immunoglobulin fractions which contained lower purity (40%). Lower antibody activity was observed in the 60% purified fractions. Separation of specific antibodies from non-specific antibodies appeared to occur, possibly due to the given characteristics of the specific antibodies, or due to the differences exhibited by chicken IgG subpopulations. Using metal chelate interaction chromatography, a 10 mL copper-loaded column was able to yield 104 mg of IgG with a purity of 75% when 200 mL egg yolk supernatant was applied. Again, the heterogeneous nature of chicken IgG was illustrated. A comparison of the two chromatographic techniques indicated the advantages of metal chelate interaction chromatography over ion exchange chromatography under the conditions examined. Applications of the chicken IgG isolated by metal chelate interaction chromatography to an enzyme-linked immunosorbent assay for the detection of β-N-acetylglucosaminidase was attempted. Linear relationships were obtained when standard solutions of the enzyme were used in the assay. The results indicate that MCIC-isolated chicken immunoglobulins have excellent potential for use in analytical tests.
Land and Food Systems, Faculty of
Graduate
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Książki na temat "Ion exchange chromatography"

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1945-, Nakanishi Kazuhiro, i Matsuno Ryūichi 1939-, red. Ion-exchange chromatography of proteins. New York: M. Dekker, 1988.

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Fritz, James S. Ion chromatography. Wyd. 4. Weinheim: Wiley-VCH, 2009.

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1954-, Tarter James G., red. Ion chromatography. New York: M. Dekker, 1987.

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E, Smith Robert. Ion chromatography applications. Boca Raton, Fla: CRC Press, 1988.

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Smith, Frank C. The practice of ion chromatography. Malabar, Fla: Krieger Pub. Co., 1991.

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David, Rocklin Roy, red. Ion exchange in analytical chemistry. Boca Raton, Fla: CRC Press, 1990.

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Sainio, Tuomo. Ion-exchange resins as stationary phase in reactive chromatography. Lappeenranta: Lappeenranta University of Technology, 2005.

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ION-EX '90 (1990 North E Wales Institute of Higher Education). Recent developments in ion exchange 2. London: Elsevier Applied Science, 1990.

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A, Williams Peter, i Hudson M. J. 1940-, red. Recent developments in ion exchange 2. London: Elsevier Applied Science, 1990.

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Meer, Andries Piet van der. On counter-current fluidized ion-exchange columns. [Delft?: S. n., 1985.

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Części książek na temat "Ion exchange chromatography"

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Small, Hamish. "Ion Exchange in Ion Chromatography". W Ion Chromatography, 57–118. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4899-2542-8_4.

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Schönbächler, Maria. "Ion Exchange Chromatography". W Encyclopedia of Earth Sciences Series, 1–6. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-39193-9_113-1.

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Schönbächler, Maria. "Ion Exchange Chromatography". W Encyclopedia of Earth Sciences Series, 731–36. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-39312-4_113.

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Sheehan, David. "Ion-Exchange Chromatography". W Springer Protocols Handbooks, 711–18. Totowa, NJ: Humana Press, 2008. http://dx.doi.org/10.1007/978-1-60327-375-6_40.

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Karlsson, Evert, i Irwin Hirsh. "Ion Exchange Chromatography". W Methods of Biochemical Analysis, 93–133. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470939932.ch4.

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Dörr, Mark. "Ion-Exchange Chromatography". W Encyclopedia of Astrobiology, 1. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-27833-4_805-2.

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Dörr, Mark. "Ion-Exchange Chromatography". W Encyclopedia of Astrobiology, 1253. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_805.

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Morss, Lester R. "Ion Exchange Chromatography". W Inorganic Reactions and Methods, 9–11. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145296.ch10.

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Sheehan, David, i Richard Fitzgerald. "Ion-Exchange Chromatography". W Springer Protocols Handbooks, 445–49. Totowa, NJ: Humana Press, 1998. http://dx.doi.org/10.1007/978-1-59259-642-3_35.

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Dörr, Mark. "Ion-Exchange Chromatography". W Encyclopedia of Astrobiology, 845. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_805.

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Streszczenia konferencji na temat "Ion exchange chromatography"

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MAXIMO, E., J. A. BENDASSOLLI i P. C. O. TRIVELIN. "ENRICHMENT OF 15N BY COUPLING THREE SYSTEMS OF ION-EXCHANGE CHROMATOGRAPHY COLUMNS". W Proceedings of the 3rd International Conference on Isotopes. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812793867_0032.

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Malvestio, A. C., M. Barboza, J. A. C. Leite i M. Zaiat. "Volatile fatty acids separation by ion exchange chromatography in fixed bed column". W Proceedings of the III International Conference on Environmental, Industrial and Applied Microbiology (BioMicroWorld2009). WORLD SCIENTIFIC, 2010. http://dx.doi.org/10.1142/9789814322119_0050.

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Nägele, B., J. Wüthrich, S. Toff i A. Schenk. "Simultaneous HPTLC identification of Fig, Senna and P. hybridus using Ion Exchange Chromatography". W GA 2017 – Book of Abstracts. Georg Thieme Verlag KG, 2017. http://dx.doi.org/10.1055/s-0037-1608200.

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Di, Huawei, Chengyin Wang i Xiashi Zhu. "Usage of Ionic Liquids as Additives in Ion Exchange Chromatography for the Analysis of Inorganic Anions". W International Conference on Industrial Application Engineering 2018. The Institute of Industrial Application Engineers, 2018. http://dx.doi.org/10.12792/iciae2018.028.

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Shah, Manan S., A. K. Sudheer, Sunil Singh, Hitesh Vaghela i Hemang H. Vaidya. "A proposed automated instrument for separation of Rare Earth Elements & Strontium by ion exchange chromatography". W 2017 International Conference on Intelligent Computing, Instrumentation and Control Technologies (ICICICT). IEEE, 2017. http://dx.doi.org/10.1109/icicict1.2017.8342723.

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Ratnayake, Ratnayake, Ryoji Tanaka i Eizo Nakamura. "Development of a sequential ion exchange chromatography method to separate geochemically important tracers for isotope measurements". W Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.18756.

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Moraes, Heice, i Guilherme Tavares. "Pilot-scale purification of milk proteins by association of membrane filtration techniques and preparative ion-exchange chromatography". W Congresso de Iniciação Científica UNICAMP. Universidade Estadual de Campinas, 2019. http://dx.doi.org/10.20396/revpibic2720192648.

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Wang, Yun, Yahui Liu, Song Lu, Yujuan Li, Yongqian Zhang, Hong Qing i Yulin Deng. "Nano-flow multidimensional liquid platform using strong ion-exchange and reversed-phase chromatography for improved proteomic analyses". W 2015 IEEE International Conference on Mechatronics and Automation (ICMA). IEEE, 2015. http://dx.doi.org/10.1109/icma.2015.7237582.

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Dyr, J. E., H. Fořtová, J. Suttnar, Z. Vorlová i F. Kornalxk. "ISOLATION OF HUMAN PROTEIN C AND ITS SNAKE VENOM ACTIVATORS BY ION EXCHANGE HIGH PERFORMANCE LIQUID CHROMATOGRAPHY". W XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644896.

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Simple and efficient methods for the purification of functionally active clotting factors in good yields are still missing. The purpose of the present study was to design a chromatographic procedure for the isolation of protein C (PC) and its snake venom activators taking advantage of the high resolution, high speed of analysis and sensitive detection of high performance liquid chromatography.PC was purified from a human plasma concentrate containing vitamin Kdependent proteins using a Mono Q anion exchanger. Electrophoretic titration curve was used to serve as a guide for finding approximate conditions for separations. Elution profiles for vitamin K-dependent proteins were determined. PC was assayed by both immunological and functional methods. For the latter methods, protein C activators (PCA) were isolated from snake venoms of Agkistrodon c, -contortrix (ACC) and Agkistrodon c, mokasen.Both venoms (pooled samples)were found to contain at least two different PCA. AtpH 6.5> by simple one step procedures either an acidic PCA (on a Mono Q) or a basic PCA (on a Mono S) was isolated. A great diversity was found among venom samples from specimen originating from a small geographic area near Philadelphia (USA). In six out of the nine analysed ACC venoms only the acidic PCA was present.In conclusion, an optimum separationof protein C onthe Mono Q at pH 8.0 was proposed (usual recovery 90-95%).Optimalization of the salt gradient was considerably more effective than the pH changes. A great individual variability has to be taken into account when snake venoms are used as a source of protein C activators.
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Carvalho, Daniela, Diana Pereira, Nuno Alves, Andreas Pickl, Sara Cardoso, Joana F. A. Valente i Ângela Sousa. "New Combined Approach to Simplify the Minicircular DNA Lysate and Directly Apply in Ion Exchange Membrane Chromatography". W Materiais 2022. Basel Switzerland: MDPI, 2022. http://dx.doi.org/10.3390/materproc2022008041.

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Raporty organizacyjne na temat "Ion exchange chromatography"

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Paterek, J. Robert. L51963 Environmental Benign Mitigation of Microbiologically Influenced Corrosion (MIC). Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), wrzesień 2002. http://dx.doi.org/10.55274/r0011299.

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The objective is to develop and evaluate environmental benign agents or products that are effective in the prevention, inhibition, and mitigation of microbially influenced corrosion (MIC) on the internal surfaces of metallic natural gas pipelines. The goal is one or more products that can be applied to maintain the structure and dependability of the natural gas infrastructure. The technical approach for this year has been to evaluate a number of methods to fractionate and concentrate the components found in the pepper extracts. The separation methods considered include size exclusion chromatography, hygroscopic and hydrophobic extraction with HPLC fractionation and analysis; preparative HPLC; and other methods based on the chemical class of compounds to be evaluated. The first classes to be studied are: terpenoids; phenolics; fatty metabolites; alkaloids; and other products of secondary metabolism in plants. Other methods to be reviewed as needed include: planar chromatography; supercritical water and CO2 extraction; and ion-exchange methods. A review of the patent literature and scientific databases found no evidence that any of the potential products have been patented, indicating potential for establishment of a strong intellectual property position. The work plan for the continuation of specific tasks of this project for two additional years was completed and accepted for funding. Laboratory testing protocols for control of biofilm formation and/or biocidal activities for both aerobic and anaerobic microorganisms known to support MIC were codified.
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Griffiths, S. K., i R. H. Nilson. Exchange front stability in packed-column chromatography. Office of Scientific and Technical Information (OSTI), kwiecień 1993. http://dx.doi.org/10.2172/10172824.

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Jordan, William. The ion-exchange chromatographic separation of the components of the product mixture resulting from reaction of trans-dichlorobis (ethylenediamine) cobalt (III) chloride with thiocyanate ion. Portland State University Library, styczeń 2000. http://dx.doi.org/10.15760/etd.377.

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