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  • Articles: DFG German National Licenses  (10)
  • 1995-1999  (10)
  • 1
    Electronic Resource
    Electronic Resource
    Water Sorption on Mesoporous Aluminosilicate MCM-41 (1995)
    s.l. : American Chemical Society
    Langmuir 11 (1995), S. 574-577 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00002a036
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Capillary Hysteresis in Nanopores: Theoretical and Experimental Studies of Nitrogen Adsorption on MCM-41 (1995)
    s.l. : American Chemical Society
    Langmuir 11 (1995), S. 4765-4772 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00012a030
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of the porosity of silica and alumina with chemically bonded polystyrene (1996)
    Springer
    Adsorption 2 (1996), S. 287-292 
    Details
    ISSN: 1572-8757
    Keywords: silica ; alumina ; composite ; nitrogen sorption ; porosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The effect of modification of porous silica and alumina with a copolymer of styrene and vinylsilane on the porosity of oxides have been investigated by means of low temperature nitrogen sorption. Only small changes of the specific surface area and of the specific pore volume were observed on modification of oxides with non-cross-linked copolymer. The specific surface area significantly increased after the cross-linking of the deposited polymeric layer while the specific pore volume remains almost unaffected. A broad hysteresis loop appears in the nitrogen sorption isotherm for the alumina modified with the cross-linked polymer. The porosity of oxides modified by chemisorption method differed strongly from that observed for composites modified by physisorption of polymer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00879543
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Comparison of Sorptometric and Thermoporometric Measurements on Porous Glass and Some Others (1999)
    Springer
    Journal of thermal analysis and calorimetry 56 (1999), S. 323-330 
    Details
    ISSN: 1572-8943
    Keywords: adsorption ; balance ; gravimetry ; sorption ; thermoporometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The results of surface structure investigations involving the use of thermoporometry and gas-sorptometry on porous glass, silica and a zeolite were compared. The most frequent and the mean pore width were found to be in accordance, but major differences in specific surface were observed. These two measuring methods complement each other, because with gas adsorption a dry sample is investigated, while with thermoporometry a sample immersed in a liquid is investigated. The probe molecules (nitrogen or noble gas and water or benzene, respectively) differ in size. The features of the two methods are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010194432703
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Vacuum for Balances (1999)
    Springer
    Journal of thermal analysis and calorimetry 55 (1999), S. 431-439 
    Details
    ISSN: 1572-8943
    Keywords: balance ; vacuum ; weighing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract This paper deals with the design of gravimetric apparatus with regard to the requirements of vacuum. Items discussed include the calculation of suction speed and ultimate vacuum, the choice of the pump and of the method of pressure control, and the design of the balance and the balance stand.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010155332289
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Native and modified alumina, titania and zirconia in normal and reversed-phase high-performance liquid chromatography (1996)
    Springer
    Chromatographia 42 (1996), S. 217-222 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Stationary phases ; TiO2 ZrO2 AlO3 ; Separation of basic compounds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Chromatographic properties of silica, alumina, titania and zirconia have been investigated in normal phase mode in the separation of test mixtures of basic, neutral and acidic compounds. In contrast to silica the chromatographic behaviour revealed the basic properties of the alumina, titania and zirconia surfaces. Therefore, separation of basic compounds on these packings seems very promising. Lypophilic packings have been synthesized by modification of titania, zirconia and alumina with organosilanes and polymers and tested for the separation of basic compounds and proteins. High hydrolytic stability of the modified packings was observed during separations with strong alkali and acidic eluents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02269656
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Packing and stationary phase design for capillary electroendosmotic chromatography (CEC) (1999)
    Springer
    Chromatographia 49 (1999), S. S49 
    Details
    ISSN: 1612-1112
    Keywords: Capillary electrochromatography ; Electroosmotic flow ; Submicron silica beads ; Mixed mode phases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Reversed-phase stationary phases based on porous silica beads in the range 0.2–3 μm have been prepared to study the dependency of electroosmotic flow (EOF) on particle diameter. Additionally, the influence of the mobile phase composition, i.e. organic modifier content, pH of buffer solution and concentration of buffer salt, on the magnitude of the electroosmotic flow velocity has been investigated. To perform separations in an aqueous acidic mobile-phase, mixed mode stationary phases containing both alkyl chains and strong cationexchange groups have been applied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02468976
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Book reviews (1996)
    Springer
    Chromatographia 42 (1996), S. 352-353 
    Details
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02290322
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    A strategy for chromatographic and structural analysis of monosaccharide species from glycoproteins (1996)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 356 (1996), S. 488-494 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A general strategy for the chromatographic and structural analysis of the monosaccharide species fucose (Fuc), N-acetylgalactosamine (GalNAc), N-acetylglucosamine (GlcNAc), galactose (Gal), glucose (Glc), mannose (Man), N-acetylneuraminic acid (NANA) present in glycoproteins is described. Qualitative and quantitative aspects for the separation of these glycoprotein monosaccharides (monosaccharide species) using ligand-exchange chromatography (LEC) and high pH anion-exchange chromatography (HPAEC) in combination with pulsed-amperometric detection (PAD), refractive index (RI) and ultraviolet (UV) monitoring are discussed in detail. The conditions for the acidic hydrolysis of glycoproteins and for the liquid chromatographic analyses of glycoprotein monosaccharides using HPAEC and LEC technique were optimised. Furthermore, the characterisation of glycoproteins according to their purity and molecular mass connected with a comparison to biomolecules that are not glycosylated or whose extent of glycosylation is low was carried out by means of matrix-assisted laser-desorption ionisation mass spectrometry (MALDI-MS). The identification of glycoprotein monosaccharides using an on-line coupling liquid chromatography mass spectrometry (LC-MS/MS) was performed by means of their characteristic “quasi molecule ions” such as (M + NH4)+ and (2M + NH4)+. The different chromatographic and structural methods used in combination with each other were applied to characterise and determine the monosaccharide species of fetuin and a membrane glycoprotein fraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0021663560488
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    HPLC analysis of carbohydrates on POLYSPHERCH®OH columns using pulsed amperometric detection (PAD) with sodium hydroxide as post column detection reagent (1996)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 356 (1996), S. 339-343 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Carbohydrates have been separated on POLYSPHER®CH OH columns using pulsed amperometric detection (PAD) and UV detection (λ =196 nm) in series and pure water as mobile phase. Nearly baseline separations have been obtained for the glycoprotein carbohydrates of sialic acid (N-acetylneuraminic acid, NANA), N-acetylglucosamine (GlcNAc) and N-acetylgalactosamine (GalNAc). As carbohydrates dissolved and eluted with pure water are present in the neutral form they are not detectable with PAD in contrast to carbohydrate anions formed at high pH values. Therefore an additional NaOH post column reagent has been continuously pumped through a mixing chamber into the mobile phase to form carbohydrate anions resulting in improved detection limits. Monosaccharides as well as glycoprotein carbohydrates could be detected in the μg/ml-range. This method has been applied successfully to the analysis of sugars in fruit juice. With only 2 μl of juice per 50 ml water, the determination of the main constituents, sucrose, glucose and fructose, was possible in a few minutes without sample preparation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0021663560339
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    Paper (German National Licenses)
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