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  • Polymer and Materials Science  (3)
  • (S)-Ketoprofen  (1)
  • 1995-1999  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Significant enhancement of lipase enantioselectivity toward (S)- Ketoprofen ester at pH 2 (1999)
    Springer
    Biotechnology letters 21 (1999), S. 143-146 
    Details
    ISSN: 1573-6776
    Keywords: (S)-Ketoprofen ; Candida rugosa lipase ; pH effect ; activity ; enantioselectivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The optimal activity of a Candida rugosa lipase (Lipase OF) for hydrolysis of 2-chloroethyl ester of Ketoprofen [2-(3- benzoyphenyl) propionic acid] was at pH 4.0, while the best enantioselectivity (E) was at pH 2.2 where the enzyme was still 60% active and stable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005413100578
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Study on the determination of the molecular weight of polyethylene with ultrahigh temperature GPC (1998)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 19 (1998), S. 115-118 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Ultrahigh or high molecular weights of polyethylenes (PE) and their distributions are for the first time determined at 160° or 170°C by gel permeation chromatography (GPC). The thermostability of PE at high temperatures is discussed. In order to calculate the real molecular weight of PE, a new calibration curve is established. For PE with high molecular weight more reliable and accurate results can be obtained by GPC measurements at these temperatures. The application of ultrahigh temperature GPC for polymer characterization is demonstrated in this paper.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 3
    Electronic Resource
    Electronic Resource
    A new theoretical formula for the determination of the copolymer composition distribution measured by gel permeation chromatography (1997)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 18 (1997), S. 601-607 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A new theoretical formula, used for the determination of the chemical composition distribution of copolymers, is proposed in this paper. The composition distribution of styrene in chlorinated butyl rubber/polystyrene comb graft copolymer was obtained by gel permeation chromatography utilising a combination of refractive index and ultraviolet detection. It is a more convenient and time-saving method for the characterization of the molecular structure parameters of a copolymer compared to the conventional experimental method.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1997.030180710
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Conformation of amphiphilic branch chain in copolymer surfactants on interface (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 35 (1997), S. 827-830 
    Details
    ISSN: 0887-6266
    Keywords: conformation ; copolymer surfactant ; amphiphilic branch chain ; oxyethylene segment ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The conformation of amphiphilic branch chain in a new type of copolymer surfactants on interface was studied. The results of laser light scattering demonstrated that the branch chain can only lie on the air/water interface. By means of XPS measurement with variable angles, the molecular conformations in different thickness of the copolymer layer were obtained. Depending on the chemical nature of the copolymer surfactants, the oxyethylene segments of the branch chains will have loop-train, train, or loop molecule conformations on the surface. © 1997 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 35: 827-830, 1997
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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