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  • Polymer and Materials Science  (2)
  • 1995-1999  (2)
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  • 1
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Durch Suspensionspolymerisation von 2-Hydroxyethylmethacrylat, Dodecylmethacrylat und Ethylenglycoldimethacrylat wurden Polymermatrices hergestellt. Es wird gezeigt, daß die Porosität durch Zugabe von Monomeren mit hydrophoben Seitenketten abnimmt. Trypsin, Rinderserumalbumin und Lipase dienten als Proteinstandards zur Bewertung der Sorbentienhydrophobie. Isokratische Chromatographie bei verschiedenen Ionenstärken offenbarte unterschiedliches Elutionsverhalten. Für einige Sorbentien wird über den gesamten Bereich der Ionenstärkevariation ein Ionenaustauschmodus beobachtet, während andere beim Überschreiten einer kritischen Salzkonzentration einen hydrophoben Wechselwirkungscharakter aufwiesen. Es wird vorgeschlagen, diese kritische Salzkonzentration als relatives Maß für die Hydrophobie der einzelnen Protein-Matrix-Salz-Systeme zu verwenden. Es wird gezeigt, daß die mit 90 μmol/g Dodecylmethacrylat in der Monomerenmischung hergestellte Matrix ausreichend hydrophob ist zur Trennung der Proteine und somit bei der Hydrophobchromatographie von Proteinen wirksam einsetzbar sein sollte.
    Notes: Polymer matrices were prepared by suspension polymerization of 2-hydroxyethyl methacrylate, dodecyl methacrylate and ethylene glycol dimethacrylate. It was shown that porosity decreased with the addition of monomers with hydrophobic side chains. Trypsin, bovine serum albumin and lipase served as standard proteins in sorbent hydrophobicity evaluation. Isocratic chromatography at various ionic strengths revealed different elution behaviours. Some sorbents exhibited an ion-exchange mode in the whole range of ionic strength variation. Some others showed a hydrophobic interaction character when the salt concentration exceeded a critical value. It is suggested to take this critical salt concentration as a relative measure of hydrophobicity for particular protein-matrix-salt systems. It was shown that the matrix containing 90 μmol/g of dodecyl methacrylate was enough hydrophobic to differentiate proteins and thus could be used effectively for hydrophobic interaction chromatography of proteins.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 61 (1996), S. 273-278 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A new ion exchange resin for the selective complexation of metal ions has been synthesized by functionalizing vinylbenzyl chloride-styrene-divinylbenzene copolymer beads with the sodium salt of tetra(isopropyl) methylene diphosphonate. The effects of bifunctionality, matrix rigidity, degree of functionalization, and macroporosity on final resin properties have been quantified. A sulfonic acid-diphosphonic acid bifunctional resin is highly selective with rapid complexation kinetics. A macroporous polymer matrix crosslinked with 10% divinylbenzene provides optimum results; for example, 99.7% Eu(III) is complexed from a 1M nitric acid solution with a 30-min contact time. The importance of physical crosslinking as well as chemical crosslinking in limiting access of substrates into polymer-supported reagents is discussed. © 1996 John Wiley & Sons, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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