Relevant bibliographies by topics / Chromatographie

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Chromatographie'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 April 2025

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Journal articles on the topic "Chromatographie"

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Meunier, Annabel. "Chromatographie." ITBM-RBM News 27, no. 1 (March 2006): 51–59. http://dx.doi.org/10.1016/s1297-9570(06)80032-4.

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Weiß, J. "Ionen-Chromatographie." Tenside Surfactants Detergents 23, no. 5 (September 1, 1986): 237–44. http://dx.doi.org/10.1515/tsd-1986-230506.

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Ebel, Siegfried. "Dünnschicht-Chromatographie." Nachrichten aus Chemie, Technik und Laboratorium 35, no. 3 (March 1987): M2—M12. http://dx.doi.org/10.1002/nadc.19870350334.

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Ehlert, Winfried. "Dünnschicht-Chromatographie." Nachrichten aus Chemie, Technik und Laboratorium 42, no. 4 (April 1994): 366–70. http://dx.doi.org/10.1002/nadc.19940420409.

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García Diez, L., H. J. Bart, and J. Szymanowski. "Micellare Chromatographie." Chemie Ingenieur Technik 75, no. 4 (April 7, 2003): 383–86. http://dx.doi.org/10.1002/cite.200390077.

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Ströhlein, G., Y. Assunção, M. Morbidelli, M. Mazzotti, and R. Proplesch. "Reaktive Chromatographie." Chemie Ingenieur Technik 77, no. 11 (November 2005): 1819–28. http://dx.doi.org/10.1002/cite.200500117.

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Meyer, Veronika R. "Hochleistungs-Flüssigkeits-Chromatographie." Journal of Chromatography A 408 (January 1987): 453. http://dx.doi.org/10.1016/s0021-9673(01)81841-0.

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Lindscheid, Michael, Walter Nigge, and Ulrich Marggraf. "Kopplungstechniken Chromatographie/Spektroskopie." Nachrichten aus Chemie, Technik und Laboratorium 43, no. 9 (September 1995): M67—M78. http://dx.doi.org/10.1002/nadc.19950430919.

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Minceva, M., J. Völkl, E. Hopmann, and W. Arlt. "Kontinuierliche Flüssig/Flüssig-Chromatographie: Ein Newcomer in der technischen Chromatographie." Chemie Ingenieur Technik 82, no. 9 (August 27, 2010): 1572. http://dx.doi.org/10.1002/cite.201050245.

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Hoffmann, Fabrice. "Chromatographie en phase liquide." Biofutur 1995, no. 149 (October 1995): 3–22. http://dx.doi.org/10.1016/s0294-3506(99)80210-5.

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Dissertations / Theses on the topic "Chromatographie"

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Mekaoui, Nazim. "Contribution à l'étude de la chromatographie à contre-courant : partage de composés ionisables, nouvelles colonnes et purification séquentielles." Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10249/document.

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La chromatographie à contre courant (CCC) est une technique de purification chimique préparative quitravaille avec un système biphasique liquide. Une phase est la phase mobile, l'autre phase est la phasestationnaire. Il n'y a aucun support solide: un champ de force centrifuge est utilisé pour maintenir en place laphase stationnaire. Ce travail est une contribution à l'étude de la purification préparative par CCC. Après uneimportante étude bibliographique des procédés de purification en continu tant en CCC qu'autres, il est montréque la méthode dite "multi-dual-mode", ou MDM, est une solution possible. Elle consiste à utiliser le fait queles deux phases liquides peuvent servir de phase stationnaire: il suffit d'inverser le sens de circulation et lanature de la phase mobile (méthode dual-mode). Le mélange est séparé de façon classique pendant untemps chronométré, puis on inverse le rôle des phases: la phase mobile devient stationnaire et vice versa eton inverse également le sens de circulation (ascendant devient descendant ou vice versa). On sort lescomposants du mélange soit d'un coté de la colonne CCC, soit de l'autre. La méthode est mise en oeuvrepour purifier le Bleu de Coomassie en le débarassant des ses composés polaires (d'un coté) et apolaire (del'autre coté de la colonne et en accumulant dans la colonne la fraction de polarité intermédiaire, fractiond'intérêt. Une nouvelle colonne hydrostatique de petit volume (30 mL) a également été testée: elle permetde tester un nouveau système liquide très rapidement
Counter-current chromatography (CCC) is a preparative purification technique that works with the twoliquid phases of a biphasic liquid system. One phase is used as the mobile phase when the other phase isused as the stationary phase. There is no solid support: centrifugal fields are used to obtain a support-freeliquid stationary phase. This work contains an exhaustive bibliographic study of what can be found in theliterature concerning continuous chromatographic processes. The multi-dual-mode (MDM) process was foundto be the best one able to purify large amount of crude mixtures. The MDM method starts with a classicalseparation of the mixture followed by a switch of both the liquid phase nature and the flowing direction. Themobile phase flowing e.g. in a descending direction becomes the stationary phase. The previous stationaryphase becomes the mobile phase flowing in the ascending direction (or vice versa). The purified compoundsof the introduced mixture are eluted at one side of the column or the other according to their polarity. TheMDM method was used to purify a crude sample of Coomassie Blue: the polar part of the dye was eluted atthe column top (or head) and the apolar part at the column bottom (or tail) while the essential part of the dyewas trapped inside the CCC column. The work also presents a new small volume (30 mL) hydrostatic CCCcolumn. It is shown that this column could be used to test quickly the potential of a given biphasic liquidsystem
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Thévenon, Géraldine. "Mecanismes de retention en chromatographie liquide a polarite de phases inversee en milieu non aqueux : etude de la retention des triglycerides." Paris 6, 1986. http://www.theses.fr/1986PA066353.

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Fuchs, Géraldine. "Étude du fractionnement d'énantiomères par chromatographie a l'échelle semi-industrielle." Vandoeuvre-les-Nancy, INPL, 1993. http://www.theses.fr/1993INPL031N.

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Contrairement aux autres méthodes enantiosélectives comme la cristallisation ou la conversion enzymatique, les procédés chromatographiques tendent à se généraliser grâce au nombre croissant de phases disponibles sur le marché; parallèlement la chromatographie chirale est surtout utilisée à l'échelle analytique, du fait du cout très élevé de ces phases, de leur faible capacité, et aussi de leur diffusion commerciale limitée. Dans ce travail, nous présentons des résultats expérimentaux obtenus à l'échelle préparatoire par deux procédés classiques d'élution (phase supercritique, phase gazeuse), ainsi que par un procédé fonctionnant selon le concept de lit mobile simule (éluant liquide). La résolution en chromatographie supercritique de trois oxydes de phosphine et du (trifluoro-2,2,2)-(anthryl-9) éthanol a conduit à des productivités significatives d'énantiomères de haute pureté. La résolution d'un époxyde racémique a montré la supériorité du procédé en lit mobile simulé par rapport au procédé classique d'élution. Finalement, le fractionnement en chromatographie en phase gazeuse de l'acétate d'octene-1-yle-3, offre des résultats encourageants sur une phase -cyclodextrine permethylée
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Marlot, Léa. "Développement de méthodes bidimensionnelles préparatives CPCxLC : application à la purification de molécules d'intérêt issues de matrices végétales." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1299/document.

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La chromatographie bidimensionnelle préparative suscite de plus en plus d'intérêt dans l'élucidation d'échantillons complexes car elle permet de collecter un grand nombre de molécules à haute pureté et quantitée récupérée. Bien que la chromatographie liquide (LC) soit souvent choisie en deuxième dimension, la chromatographie de partage centrifuge (CPC) à de multiples avantages qui en font une technique de choix pour la première dimension. Dans le but de purifier plusieurs molécules d’intérêt dans les matrices végétales, le couplage «comprehensive» CPCxLC représente une technique à fort potentiel. Après avoir expliqué son intérêt et les enjeux liés à la séparation préparative en mode «comprehensive», le développement d’une telle séparation est étudiée selon trois axes. Tout d’abord, une purification de deux molécules d’intérêt dans la plante Edelweiss est réalisée à l’échelle industrielle grâce à la réalisation de cartographies 2D au laboratoire. Cette application permet de montrer l’intérêt du couplage et de mettre en évidence les verrous liés aux conditions de transfert total des fractions en deuxième dimension. Dans une deuxième partie, la séparation CPCxLC en mode « comprehensive » est développée avec le transfert total de l’échantillon en deuxième dimension pour la purification de cinq composés cibles présents dans la plante Edelweiss. Les points clés de la séparation CPCxLC, à savoir le temps d’échantillonnage et le transfert en deuxième dimension, sont étudiés au regard du couplage LCxLC afin de garantir une qualité de séparation permettant la récupération totale des composés. Enfin, la troisième partie consiste à la mise en place d’une méthodologie de sélection des systèmes CPCxLC basée sur l’évaluation quantitative du potentiel des systèmes bidimensionnels à apporter de la distance entre les pics. Cette procédure de sélection est développée sur l’échantillon Cyclopia genistoides avec l’objectif d’isoler huit composés cibles
Preparative two-dimensional chromatography is gaining interest in the elucidation of complex samples as it allows the collection of a large number of molecules with high recovered purity and quantity. While the second dimension is often selected to be liquid chromatography (LC), centrifugal partition chromatography (CPC) is a technique with multiple advantages representing a suitable first dimension. In order to purify several molecules of interest in plant matrices, the comprehensive CPCxLC represents a technique with high potential. After explaining its interest and the issues related to the preparative separation in comprehensive mode, the development of such a separation is studied according to three axes. Firstly, a purification of two targeted molecules in Edelweiss plant is carried out at industrial scale thanks to the realization of 2D-contour plot. This application allows to expose the interest of the separation and to highlight the locks related to the conditions of total transfer of the fractions in second dimension. In a second part, the comprehensive CPCxLC separation is developed with the total transfer of the sample in second dimension applied to the purification of five target compounds from Edelweiss plant. The key points of the CPCxLC separation, namely the sampling time and the second dimension transfer, are studied with regard to the LCxLC separation in order to ensure a separation quality allowing the total recovery of the compounds. Finally, the third part consists in the implementation of a CPCxLC system selection methodology based on the quantitative evaluation of the potential of two-dimensional systems to generate distance between peaks. This selection procedure is developed on the sample Cyclopia genistoides with the objective of isolating eight target compounds
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Prache, Nolwenn. "Apport des solvants alternatifs pour la cartographie du lipidome par chromatographie." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS052/document.

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Le développement du concept de chimie analytique « verte » représente l’une des préoccupations majeures du tout début du 21ème siècle ; elle a amené les différents acteurs du domaine à s’interroger sur le bien-fondé du développement de méthodes ayant un impact sur l’environnement et sur l’homme. Dans le domaine de l’analyse des lipides, les séparations par classe nécessitent de travailler sur une très large gamme de polarité, conséquence directe de la diversité des structures et des solubilités mises en jeu. La chromatographie en phase normale (NPLC) permet de réaliser l’élution des composés par ordre de polarité croissante. La mise en solution des classes lipidiques nécessite le recours à des mélanges de solvants incluant le chloroforme, le n-heptane, dichlorométhane. Les solvants organiques classiquement utilisés en NPLC, bien que performants, soulèvent aussi de nombreux problèmes liés à leur toxicité pour l'homme et l'environnement, leur volatilité, ou encore leur origine quand ils sont issus des hydrocarbures fossiles. Une des voies envisagée est la substitution de ces solvants par des solvants alternatifs, tels ceux proposés par les différents acteurs de la chimie verte. L'intérêt suscité par ces solvants est prometteur en termes de réduction de l'utilisation de solvants avec un impact significatif sur l'environnement. Les propriétés de la chromatographie en phase dioxyde de carbone supercritique sont semblables à la NPLC et offrent également une alternative verte à cette méthode. Ce travail a mis en évidence que des méthodes de séparation pourraient être développées avec des solvants alternatifs au n-heptane, au méthanol et au chloroforme. Leur utilisation est compatible avec la chromatographie liquide et la chromatographie supercritique et offre une meilleure sélectivité en termes de séparation des classes de lipides. La compatibilité de solvants alternatifs avec ELSD et la spectrométrie de masse a également été évaluée, ce qui a montré que l'absence de pureté suffisante pourrait être un problème. Cependant, ce problème a également été observé avec l'utilisation de solvants commerciaux, qui présentaient des impuretés telles que des acides gras, des polymères et des antioxydants
Green analytical chemistry development represents one of the main issues of the 21th century. Many investigators in analytical chemistry are actually involved in the development of well-established analytical methods that prevent irreversible damage to humans and environment. In the domain of lipid analysis, structural diversity as well as difference in solubility of these compounds is leading to work with a very large polarity range to separate lipids by classes. The normal-phase liquid chromatography (NPLC) allows realising the elution of compounds in order of increasing polarity. The solubilisation of lipid classes requires the use of a mixture of several solvents, among them chloroform, n-heptane, dichloromethane. Moreover, organic solvents traditionally used in NPLC, although well performing are raising different problems due to their original source, i.e. fossil hydrocarbons, volatility and toxicity for humans and environment. One of the ways to avoid such solvents is the substitution with alternative solvents, as proposed by various players in green chemistry. The interest raised by these solvents, is promising in terms of reduction of solvent use with a significant environmental impact. The properties of supercritical fluid chromatography using CO₂ are similar to NPLC and also offer a green alternative to this method. This work has highlighted that separation methods could be developed with alternative solvents to n-heptane, methanol and chloroform. Their use is compatible with liquid and supercritical chromatography and offer better selectivity in terms of separation of lipid classes. The compatibility of alternative solvents with ELSD and mass spectrometry was also evaluated, which showed that the unavailability of sufficient purity could be an issue. However, this problem was also observed with the use of commercial solvents, which presented impurities such as fatty acids, polymers and antioxidants
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Ley, Adrian. "Matrix gestützte Polymernetzwerke für die Anwendung in der konvektiven präparativen Chromatographie." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2019. http://hdl.handle.net/11858/00-1735-0000-002E-E558-6.

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Lanco, Clarisse. "Analyses des monosaccharides par chromatographie en phase gazeuse et par chromatographie liquide haute performance." Paris 5, 1994. http://www.theses.fr/1994PA05P221.

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Beaudoux, Michel. "Le couplage en ligne de la chromatographie liquide de partage avec la chromatographie gazeuse." Strasbourg 1, 1995. http://www.theses.fr/1995STR15055.

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Raimbault, Adrien. "Analyse de molécules d'intérêt biologique en chromatographie supercritique et chromatographie unifiée - Etudes fondamentales et applications." Thesis, Orléans, 2019. http://www.theses.fr/2019ORLE3021.

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La SFC est une technique analytique ancienne qui a mis du temps à s’implanter dans les mœurs des chromatographistes, restant de longues années dans l’ombre de l’HPLC et la GC. Les petites molécules peu polaires s’analysent facilement grâce à cette technique du fait de la faible polarité du dioxyde de carbone. Qu’en est-il des composés polaires ? Plusieurs méthodes ont été mises en place afin de les analyser. Une technique intermédiaire entre la SFC et l’HPLC a été utilisée, la chromatographie unifiée.Ce travail de recherche traite de méthodes pour analyser des molécules de polarité plus élevée, tels que des acides aminés. Des phases stationnaires ont été étudiées grâce au modèle LSER pour comprendre le comportement de telles molécules dans un milieu supercritique. Un développement de méthode a été effectué pour l’analyse d’acides aminés. Cette méthode a ensuite été utilisée pour diverses applications (compléments alimentaires, plante d'intérêt pharmaceutique)
SFC is an old analytical technique that took time to establish itself in the morals of chromatographers, remaining for many years in the shadow of HPLC and GC. Small and non-polar molecules are easily analysed using this technique because of the low polarity of carbon dioxide. What about polar compounds? Several methods can be used to analyse them. An intermediate technique between SFC and HPLC was used, unified chromatography.This research deals with methods for analysing molecules of higher polarity, such as amino acids. Stationary phases were studied using the LSER model to understand the behaviour of such molecules in a supercritical environment. A method development was performed for amino acid analysis. This method was then used for various applications (food supplements, plant of pharmaceutical interest)
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DUMAS, HERBIN CHRISTINE. "Chromatographie en phase liquide et synthese organique, exemple d'un produit industriel : la cylcododecanone oxime." Paris 6, 1987. http://www.theses.fr/1987PA066104.

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Les techniques de la chromatographie en phase liquide ont permis de mettre au point une separation optimisee des impuretes de la cyclododecanone oxime. La methode la plus performante est la chromatographie de partage a polarite de phases inversee sur un gel de silice greffee octadecyle avec une phase mobile ayant la composition suivante : methanol-acetonitrile-tetrahydrofurane-eau 33:24:3,5:39,5 (v/v). Une trentaine d'impuretes sont ainsi mises en evidence grace a l'emploi d'une colonne de petit calibre de 1 metre de long et de 1 millimetre de diametre interieur. Cette colonne contient 30000 plateaux theoriques. La duree de la separation est de 3,5 heures. L'identification d'un certain nombre de ces impuretes a ete effectuee par la conjonction de differentes methodes : couplage en ligne avec la spectrometrie de masse et chromatographie semi-preparative permettant d'isoler des quantites notables de certaines impuretes identifiees par la spectrometrie de masse differee de meme on a pu appliquer a ces impuretes la spectrometrie infrarouge par transformee de fourier
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Books on the topic "Chromatographie"

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McCown, Mick. Systematic analytical QC for process GC. Norwich, N.Y.]: Knovel, 2011.

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Ravindranath, B. Principles and practice of chromatography. Chichester, West Sussex, England: E. Horwood, 1989.

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C, MacDonald John, ed. Inorganic chromatographic analysis. New York: Wiley, 1985.

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Paul, Matejtschuk, ed. Affinity separations: A practical approach. Oxford: Oxford University Press, 1997.

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M, Miller James. Chromatography: Concepts and contrasts. 2nd ed. Hoboken, N.J: Wiley, 2005.

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

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Touchstone, Joseph C. Practice of thin layer chromatography. 3rd ed. New York: Wiley, 1992.

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S, Hage David, ed. Handbook of affinity chromatography. 2nd ed. Boca Raton: Taylor & Francis, 2006.

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1948-, Fähnrich Jan, and Tatar Vlastimil 1956-, eds. Chromatographic analysis of alkaloids. New York: M. Dekker, 1990.

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Oehme, Michael. Hochauflösende Gas-Chromatographie. Heidelberg: A. Hüthig, 1986.

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Book chapters on the topic "Chromatographie"

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Schopfer, Peter. "Chromatographie." In Experimentelle Pflanzenphysiologie, 130–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-61904-5_17.

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Schügerl, Karl. "Chromatographie." In Analytische Methoden in der Biotechnologie, 77–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-93590-9_6.

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Holtzhauer, Martin. "Chromatographie." In Methoden in der Proteinanalytik, 7–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-61422-4_2.

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Arndt, T. "Chromatographie." In Springer Reference Medizin, 583–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-48986-4_739.

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Arndt, T. "Chromatographie." In Lexikon der Medizinischen Laboratoriumsdiagnostik, 1–4. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49054-9_739-1.

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Matissek, Reinhard, Markus Fischer, and Gabriele Steiner. "Chromatographie." In Lebensmittelanalytik, 67–101. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-55722-8_5.

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Matissek, Reinhard, and Markus Fischer. "Chromatographie." In Lebensmittelanalytik, 103–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-63409-7_5.

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Hübel, M., V. Definti, M. Büchli, R. Müller, Chr Dandois, and J. Saner. "Chromatographie, Grundlagen." In Laborpraxis 3 Trennungsmethoden, 199–215. Basel: Birkhäuser Basel, 1996. http://dx.doi.org/10.1007/978-3-0348-7556-1_15.

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Pauschmann i. R., H. "Gas-Chromatographie." In Untersuchungsmethoden in der Chemie, 34–47. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527630929.ch3.

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Gritter, Roy J., James M. Bobbitt, and Arthur E. Schwarting. "Gas-Chromatographie." In Einführung in die Chromatographie, 37–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-72789-4_2.

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Conference papers on the topic "Chromatographie"

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Qin, Jiatong, Yuanhua Yu, Meng Wei, and Han Liu. "Methodological Establishment of ACR Chromatographic Assay in Urine." In 2024 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO), 55–58. IEEE, 2024. https://doi.org/10.1109/3m-nano61605.2024.10769646.

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Chen, Hao, Josiah Poon, Simon Poon, Kelvin Chan, Ka Ho Wong, and Daniel Sze. "Evaluation of herbal Chromatographie fingerprint identification systems." In 2012 IEEE International Conference on Bioinformatics and Biomedicine Workshops (BIBMW). IEEE, 2012. http://dx.doi.org/10.1109/bibmw.2012.6470352.

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Electricwala, A., and T. Atkinson. "TANDEM PURIFICATION OF TISSUE PLASMINOGEN ACTIVATOR BY METAL CHELATE AND AFFINITY CHROMATOGRAPHY." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644831.

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A tandem purification procedure was developed by a combination of metal chelate and affinity chromatography. The conditioned medium from different cell lines producing tissue plasminogen activator was first chromatographed on a zinc chelate-agarose column equilibrated with low ionic strength buffer. After thorough washing, the column was connected to a lysine-agarose column, previously equilibrated with the same buffer. Tissue plasminogen activator was eluted from the zinc chelate column by a gradient of imidazole and the effluent was allowed to flow through lysine-agarose matrix. The two columns were disconnected and after thorough washing, the bound enzyme from lysine-agarose column was eluted with a linear gradient of potassium thiocyanate in the equilibration buffer. This method resulted in a purification factor which varied between 40 to 110 fold. The purity of the isolated enzyme was assessed by sodium dodecyl sulphate-gel electrophoresis and fibrin zymography. The chromatographic procedure described provides a novel method for the rapid purification of tissue plasminogen activator to a high degree of purity.
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DESMET, GERT, and GINO V. BARON. "SHEAR-DRIVEN CHROMATOGRAPHY: PERFORMING HIGH-VELOCITY OPEN-TUBULAR CHROMATOGRAPHIC SEPARATIONS AT ZERO PRESSURE DROP." In Proceedings of the Second Pacific Basin Conference. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812793331_0013.

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Srinivasan, Poorna, and Estefania M. Endara Arguello. "ASSESSMENT OF CHROMATOGRAPHIC SEPARATION TECHNIQUES FOR SATURATE AND AROMATIC BIOMARKERS USING GAS CHROMATOGRAPHY MASS SPECTROMETRY." In GSA Connects 2023 Meeting in Pittsburgh, Pennsylvania. Geological Society of America, 2023. http://dx.doi.org/10.1130/abs/2023am-390438.

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Holas, Tomáš, Jan Ilko, and Georg Rockel. "Position Detection of an Analyte Phase in the Liquid Chromatography Column Using a Clamp-on Ultrasonic Monitor." In DOKOR 2024. Medzinárodná interdisciplinárna doktorandská konferencia, 283–99. VERBUM – vydavateľstvo Katolíckej univerzity v Ružomberku, 2024. http://dx.doi.org/10.54937/2024.9788056111024.283-299.

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In this study are results of an experimental analyte phase position detection in a liquid chromatograph column. To perform this experiment, a liquid chromatograph was used, with ethylacetate as the analyte and the ultrasonic portable flow monitor type Fluxus G608, primarily intended for measuring gas and liquid flows in industry. The experiment was based on measuring of different values of speed of sound during the movement of ethylacetate through the adsorbent column.The measurement results confirmed the possibility of using the given method to determine the position of the analyte in the chromatographic column.
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Guindo, A., Z. Cisse, I. Keita, S. Desmonde, YdS Sarro, BA Touré, MA Baraika, et al. "Acceptabilité, performances diagnostiques et faisabilité du dépistage néonatal de la drépanocytose à l'aide de deux tests de diagnostic rapide: "Sicklescan" et "Hemotypesc" au Mali." In MSF Paediatric Days 2022. NYC: MSF-USA, 2022. http://dx.doi.org/10.57740/84y6-3a16.

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BACKGROUND AND AIMS La drépanocytose est une maladie potentiellement mortelle dans les populations africaines, en particulier chez les enfants de moins de 5 ans. Dans des contextes à ressources limitées, l'amélioration de leur prise en charge passe par un diagnostic précoce et fiable. Nous avons évalué l'acceptabilité maternelle et des professionnels de santé et les performances diagnostiques de deux tests de diagnostic rapide (TDR) pour le dépistage systématique de la drépanocytose chez le nouveau-né au Mali. METHODS Un dépistage systématique des Syndromes Drépanocytaires Majeurs (SDM) (HbSS, HbSC ou HbS/B-thalassémie) a été implémenté à l'accouchement chez les nouveau-nés dans trois maternités à Bamako et Kayes. Les deux TDR (SickleScan® et HemotypeSC®) ont été réalisés à partir de sang de cordon et comparés à la technique de référence, la chromatographie liquide à haute performance (CLHP). Les nouveau-nés diagnostiqués SDM sont pris en charge. RESULTS Parmi les 4333 femmes ayant accouché entre avril et août 2021, 84,6% ont donné leur accord pour le dépistage néonatal. Au total, 3 648 nouveau-nés ont été diagnostiqués par HPLC dont 1,64% présentaient un SDM (0,63% HbSS, 0,85% HbSC et 0,16% HbSB+thalassémie), 78,21% une hémoglobine normale (HbAA), 19,84% étaient porteurs d'hémoglobine S, 0,22% étaient homozygotes pour l'HbC et 0,08% avaient une HbC/B+thalassémie. Comparé à l'HPLC, le SickleScan et l’HemotypeSC avaient respectivement une sensibilité de 81,67% et 78,33%, une spécificité de 99,75% et 99,67%, une valeur prédictive négative de 99,69% et 99,64% et une valeur prédictive positive de 84,48% et 79,66%. CONCLUSIONS Cette étude montre que le dépistage systématique des SDM à la naissance est bien accepté par les familles et professionnels de santé. Les deux TDR ont eu des performances de diagnostic remarquables par rapport à l'HPLC pour identifier les SDM, faisant de ces TDR un outil de choix pour un dépistage néonatal abordable, rapide et facile à utiliser.
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Stanić, Petar B., Biljana Šmit, Jovana Muškinja, Tanja Soldatović, Marko Ilić, Kristian Pastor, and Marijana Ačanski. "Normal and Reversed Phases Thin-Layer Chromatography of Arylidene 2- Thiohydantoin Derivatives." In 2nd International Conference on Chemo and Bioinformatics. Institute for Information Technologies, University of Kragujevac, 2023. http://dx.doi.org/10.46793/iccbi23.531s.

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In this paper, the retention behavior of thirteen newly synthesized arylidene derivatives of 2-hydamthione was investigated by normal and reversed phases thin-layer chromatography. In normal phase chromatography, thin layers of silica gel and cyano-propyl (CN) silica gel with fluorescent indicator F254 were used as the stationary phase. As the mobile phase, binary systems of non-aqueous solvents benzene-ethyl acetate and hexane-ethyl acetate were used, 8:2 (v/v). Reversed phase chromatography was performed using a thin layer of octadecyl (C-18) silica gel with fluorescent indicator F254 as the stationary phase and a binary solvent mixture of acetonitrile-water in the ratio 7.5:2.5 (v/v) as the mobile phase. Observing under a UV lamp, the spots of all tested derivatives were clearly visible. The RF value was determined for each spot. Based on the obtained results the HPLC technique is recommended for further chromatographic examination of the newly synthesized arylidene derivatives of 2-hydamthione, using commercial columns with polar chemically bound phases and both non-aqueous and aqueous eluents.
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Ramadhaningtyas, Dillani Putri, Nurhani Aryana, Yosi Aristiawan, and Dyah Styarini. "Optimization of chromatographic conditions for determination of aflatoxin B1, B2, G1 and G2 by using liquid chromatography-mass Spectrometry." In PROCEEDINGS OF THE 3RD INTERNATIONAL SYMPOSIUM ON APPLIED CHEMISTRY 2017. Author(s), 2017. http://dx.doi.org/10.1063/1.5011928.

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Bachurin, B. A. "TRANSFORMATION OF THE ORGANIC BACKGROUND OF THE HYDROSPHERE IN CONDITIONS OF OIL POLLUTION." In Проблемы минералогии, петрографии и металлогении. Научные чтения памяти П. Н. Чирвинского. Perm State University, 2023. http://dx.doi.org/10.17072/chirvinsky.2023.12.

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The methodological features of assessing the nature of organic pollution of the hydrosphere in oil-producing regions are considered. It has been established that in many cases the elevated values of the oil products indicator are due to the peculiarities of the natural hydrogeochemical background and are not associated with technogenic pollution. Using the example of oil fields in the Perm Kama region, it has been shown that reliable identification of sources of organic pollution is possible based on the study of the composition of aquabitumoids and water-soluble oil products by chromatography-mass spectrometry using the technology of spectral-chromatographic profiling.
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Reports on the topic "Chromatographie"

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Olsen and Wise. PR-179-12603-R02 Energy Meter Performance Assessment Phase 1 Amendment - Unblinded. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), April 2014. http://dx.doi.org/10.55274/r0010833.

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Many pipelines utilize system chromatographs at delivery locations. The energy content of the gas delivered can have a significant time skew from the chromatograph. Therefore, the energy content of the gas at a delivery point may differ significantly from its associated system chromatograph. On lean burn engines with tight emission controls, changes in the energy content of the fuel gas can significantly alter the amount of air required to maintain emissions compliance. A reliable, low cost, and fast responding energy meter is desired for both scenarios described. Four Energy Meters are evaluated with six different gas compositions representative of gas compositions encountered on natural gas pipelines. The Energy Meter data is compared to a Micro GC to assess accuracy. After evaluation of the Energy Meters the same six gas compositions were operated in a CFR engine to measure methane number. The measured methane numbers are compared with methane numbers computed from energy meter data.
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Olsen and Wise. PR-179-12603-R03 Energy Meter Performance Assessment Phase 1 Amendment - Blinded. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), June 2014. http://dx.doi.org/10.55274/r0010559.

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Many pipelines utilize system chromatographs at delivery locations. The energy content of the gas delivered can have a significant time skew from the chromatograph. Therefore, the energy content of the gas at a delivery point may differ significantly from its associated system chromatograph. On lean burn engines with tight emission controls, changes in the energy content of the fuel gas can significantly alter the amount of air required to maintain emissions compliance. A reliable, low cost, and fast responding energy meter is desired for both scenarios described. Four Energy Meters are evaluated with six different gas compositions representative of gas compositions encountered on natural gas pipelines. The Energy Meter data is compared to a Micro GC to assess accuracy. After evaluation of the Energy Meters the same six gas compositions were operated in a CFR engine to measure methane number. The measured methane numbers are compared with methane numbers computed from energy meter data.
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Bora. PR-004-14604-R01 Miniaturized Gas Chromatography and Gas Quality Sensor. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), June 2015. http://dx.doi.org/10.55274/r0010869.

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The natural gas industry currently relies on gas chromatography to evaluate the composition of natural gas including alkanes, carbon dioxide, nitrogen, and oxygen. The higher and lower heating values, Wobbe Index, Hydrocarbon Dewpoint, Methane Number, and viscosity are all calculated from the gas composition. The need to understand the composition of fuel gas and to monitor its components is crucial to the natural gas industry. Monitoring the composition of the fuel gas provides the industry with the capability of protecting valuable underground assets, delivering gas that meets end-usage requirements, and tracking of constituents for both billing purposes and to ensure compliance with tariff agreements. As with any technology, there are limitations to gas chromatography. Limitations can include high cost, time delay, inability to sample at high pressure, and selectiveness of gas chromatography detectors. This project consisted of a technology assessment of currently available and emerging technologies including micro gas chromatographs, optical spectrometers, and mass spectrometers for their ability to determine gas composition compared to current GC technology. Technologies were investigated and assessed by their analytical characteristics (what components they could analyze and detection limits), their sampling characteristics (sampling pressure limits, scan time, and emissions), and their operational characteristics (availability, cost, consumables, maintenance, and packaging). Recommendations for further testing were made on the technologies whose characteristics showed the most promise for analysis of natural gas at custody transfer points.
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Laub, R. J. Inverse Gas Chromatography. Fort Belvoir, VA: Defense Technical Information Center, September 1990. http://dx.doi.org/10.21236/ada227677.

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Peterson, Warren. PR-663-19600-Z01 Develop Guidance for Calculation of HCDP in Pipelines. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), March 2020. http://dx.doi.org/10.55274/r0011659.

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To maintain the integrity and reliability of natural gas transportation systems, system operators ensure that products in transit remain in the gas phase under foreseeable operating conditions. Compliance with pipeline hydrocarbon dew point (HCDP) specifications are demonstrated though in-situ testing or predictive models based on Equations of State (EOS) calculations. Numerical prediction of HCDP is a product of contributing elements, including gas chromatography, calibration gas quality, thermophysical science and the experimental data that underpins equations of state. Some hydrocarbon mixtures, such as those from non-traditional gas supplies, are more difficult to sample and assess than others. The methods described in this paper and accompanying spreadsheet examples are designed to assist persons in making technically defendable decisions with respect to predictive methods and the operational impacts of liquid dropout. The primary focus of this work is to connect the over-all performance of HCDP prediction to its operational implications. The secondary objective of the work is to provide tools for assessing the potential benefit from using C9+ versus C6+ gas chromatographs.
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Jeanne E. Pemberton. Vibrational Spectroscopy of Chromatographic Interfaces. Office of Scientific and Technical Information (OSTI), March 2011. http://dx.doi.org/10.2172/1004481.

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Crouch, Rebecca, Jared Smith, Bobbi Stromer, Christian Hubley, Samuel Beal, Guilherme Lotufo, Afrachanna Butler, et al. Preparative, extraction, and analytical methods for simultaneous determination of legacy and insensitive munition (IM) constituents in aqueous, soil or sediment, and tissue matrices. Engineer Research and Development Center (U.S.), August 2021. http://dx.doi.org/10.21079/11681/41480.

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No standard method exists for determining levels of insensitive munition (IM) compounds in environmental matrices. This project resulted in new methods of extraction, analytical separation and quantitation of 17 legacy and 7 IM compounds, daughter products of IM, and other munition compounds absent from USEPA Method 8330B. Extraction methods were developed for aqueous (direct-injection and solid-phase extraction [SPE]), soil, sediment, and tissue samples using laboratory-spiked samples. Aqueous methods were tested on 5 water sources, with 23 of 24 compounds recovered within DoD QSM Ver5.2 limits. New solvent extraction (SE) methods enabled recovery of all 24 compounds from 6 soils within QSM limits, and a majority of the 24 compounds were recovered at acceptable levels from 4 tissues types. A modified chromatographic treatment method removed analytical interferences from tissue extracts. Two orthogonal high-performance liquid chromatography-ultraviolet (HPLC-UV) separation methods, along with an HPLC–mass spectrometric (HPLC-MS) method, were developed. Implementing these new methods should reduce labor and supply costs by approximately 50%, requiring a single extraction and sample preparation, and 2 analyses rather than 4. These new methods will support environmental monitoring of IM and facilitate execution of risk-related studies to determine long-term effects of IM compounds.
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Crouch, Rebecca, Jared Smith, Bobbi Stromer, Christian Hubley, Samuel Beal, Guilherme Lotufo, Afrachanna Butler, et al. Methods for simultaneous determination of legacy and insensitive munition (IM) constituents in aqueous, soil/sediment, and tissue matrices. Engineer Research and Development Center (U.S.), August 2021. http://dx.doi.org/10.21079/11681/41720.

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Currently, no standard method exists for analyzing insensitive munition (IM) compounds in environmental matrices, with or without concurrent legacy munition compounds, resulting in potentially inaccurate determinations. The primary objective of this work was to develop new methods of extraction, pre-concentration, and analytical separation/quantitation of 17 legacy munition compounds along with several additional IM compounds, IM breakdown products, and other munition compounds that are not currently included in U.S. Environmental Protection Agency (EPA) Method 8330B. Analytical methods were developed to enable sensitive, simultaneous detection and quantitation of the 24 IM and legacy compounds, including two orthogonal high-performance liquid chromatography (HPLC) column separations with either ultraviolet (UV) or mass spectrometric (MS) detection. Procedures were developed for simultaneous extraction of all 24 analytes and two surrogates (1,2-dinitrobenzene, 1,2-DNB; o-NBA) from high- and low-level aqueous matrices and solid matrices, using acidification, solid phase extraction (SPE), or solvent extraction (SE), respectively. The majority of compounds were recovered from four tissue types within current limits for solids, with generally low recovery only for Tetryl (from 4 to 62%). A preparatory chromatographic interference removal procedure was adapted for tissue extracts, as various analytical interferences were observed for all studied tissue types.
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Mauritz, Kenneth A., and Robson F. Storey. Size Exclusion Chromatography System. Fort Belvoir, VA: Defense Technical Information Center, March 2001. http://dx.doi.org/10.21236/ada393948.

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Aris, R., and R. W. Carr. Continuous chemical reaction chromatography. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/7070042.

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