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Chemische Prozesse und Phasenübergänge Poster: Mi., 14:00–16:30 M-P179 Untersuchungen zur Laserdesorption am System NO/ HOPG mittels des VUV-FEL (FLASH) Marco Rutkowski 1 , Tim Hoger 1 , Björn Siemer 1 , Carsten Thewes 1 , Helmut Zacharias 1 1 Physikalisches Institut, Wilhelm Klemm Str. 10, 48149 Münster Zur Untersuchung katalytischer Reaktionen an Oberflächen wurden am FLASH Untersuchungen zur Laserdesorption am System NO/ HOPG gemacht. Hierbei wurden die NO Moleküle mittels des VUV Laserstrahls von der Oberfläche desorbiert und konnten dann in einem zweiten Schritt mit einen weiteren Laser zustandsselektiv nachgewiesen werden. Es konnten sowohl die Geschwindigkeitsverteilungen der Moleküle als auch der Desorptionsyield gegenüber der Intensität des Desorptionslasers bestimmt werden. Theoretisches Ansätze zur Modellierung des Desorptionssignales in Abhängigkeit des Desorptionslaser werden aktuell erarbeitet und sollen hier präsentiert werden. Zudem konnten auch weitere Adsorbate wie z.B. Wasserstoff direkt als Ionen nachgewiesen werden.
Chemische Prozesse und Phasenübergänge Poster: Mi., 14:00–16:30 M-P180 Phase behavior of aqueous dispersions of mixtures of ceramide, cholesterol and protonated fatty acid Sofia L. Souza 1 , M. José Capitan 2 , Sérgio S. Funari 3 , Jesus Alvarez 4 , Eurico Melo 1 1 Instituto de Tecnologia Química e Biológica, Av. da República-EAN, 2784-505 Oeiras, Portugal – 2 Instituto de estructura de la materia- CSIC. C/ Serrano 119, 28006- Madrid, Spain – 3 Hasylab, DESY, Notkestrasse 85, D-22607 Hamburg, Germany – 4 Dpto. Física de la materia condensada Universidad Autónoma de Madrid, Canto- blanco. 28049 Madrid, Spain The lipid matrix of the stratum corneum (SC) of mammals is a mixture, whose main components are ceramides (Cer), cholesterol (Chol) and saturated fatty acids (FA). Probably because of being so unusual, and also due to the absence of applications of alike lipid blends in the industry, the physical-chemical properties of mixtures involving these classes of lipids have not been the object of systematic studies similar to those existing for ubiquitous lipids, such as cholines. Our objective in this work is the study of the thermotropic binary phase diagrams for the system containing C16 acyl ceramide and cholesterol, Cer16/Chol, at low ionic strength (100 mM) in excess water. Once obtained the binary phase diagram of Cer16/Chol we investigate the effect of the presence of palmitic acid FA16, ionized and protonated, in the thermotropism and structural properties of the mixture. The experiments including FA were done only for the relative Cer/Chol composition found in the SC lipid matrix (54:46 Cer16/Chol mole ratio), in this way crossing the composition equivalent to the Cer/Chol/FA relative abundances in the SC. From DSC we obtained the more plausible phase boundaries that were subsequently checked, and structurally characterized, by simultaneous SAXD and WAXD as a function of temperature. Ceramide systems are known to have metastable phases attributed to the strong interaction between headgroups. Pure Cer16 forms a lamellar phase that, as observed with other sphingolipids, suffers no thermal expansion until the phase transition, observed by DSC at 90 o C. In the region from 47-65 o C the chain structure gradually changes from ordered to relatively disordered. In the presence of Chol two new phases appear: one that can be ascribed to pure Chol in the monohydrate or anhydrous form, and other that may be interpreted as the result of Chol being dissolved in Cer16 lamellae. The analysis of the data allows the deduction of the thermotropic phase diagram for the Cer16/Chol system in excess water. From the DSC thermograms, and the SAX and WAX diffractograms of the mixtures between 54:46 Cer16/Chol and FA16 at two extreme pH values (corresponding to fully protonated and fully deprotonated FA16) we also deduce the phase behavior of these mixtures as a function of the FA16 molar fraction.
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Impressum: Herausgeber: A. Schreyer
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Postersitzung A Mittwoch, 4. Oktobe
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Postersitzung B Donnerstag, 5. Okto
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Allgemeine Hinweise Tagungsort Die
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Lageplan Mensa Studierendenhaus (Ha
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Plenarvortrag Mi., 17:00-17:30 M-PV
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Index Autoren und ihre Beiträge: u
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Index M-P98, M-P100, M-P101, M-P195
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Index Deák, L. D-P300 Decker, H. M
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Index Gavrila, G. D-P276 Gebhardt,
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Index Homeyer, J. D-P377, D-P389 Ho
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Index Kravtsov, E. D-P231, D-P252 K
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Index Mezei, F. M-P13, M-P22, D-V27
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Index Ponce, M.L. D-P214 Ponkratz,
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Index Schmidt, O. M-P132, M-P153 Sc
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Index Stürmer, D. D-P405 Stuermer,
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Index Wochner, P. F-V68 Woiterski,
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