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  • 1995-1999  (2)
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  • 1
    Digitale Medien
    Digitale Medien
    Interaction of catechin with poly(L-proline) (1996)
    Springer
    Polymer bulletin 37 (1996), S. 691-698 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary Catechin binds strongly to both poly(vinylpyrrolidone) and poly(L-proline) in dilute aqueous solution, inducing a collapse of the more flexible poly(vinylpyrrolidone) chains, but forming a microgel with the more extended poly(L-proline) chains. Low concentrations of poly(L-proline) inhibit the discoloration of aqueous solutions of catechin, thereby implicating the ortho hydroxyyl groups in the catechol moiety in the binding process. Modeling shows that the likely binding sites on poly(L-proline) arise from two minor local conformations. These minor conformations are less frequent in poly(γ-hydroxy-L-proline) than in poly(L-proline), which may explain why catechin interacts more strongly with poly(L-proline) than with poly(γ-hydroxy-L-proline).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00296617
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Implications of the fluorescence for the conformational analysis of polymeric profisetinidins and procyanidins (1995)
    Springer
    Polymer bulletin 34 (1995), S. 79-85 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary The common monomeric units in the polymeric procyanidins are catechin and epicatechin, which have a hydroxyl group at C(5). This hydroxyl group is absent in the profisetinidins. The fluorescence properties have been characterized for the profisetinidin monomer and dimers, and compared with previous results for the procyanidins. There is a measurable heterogeneity in the fluorescence of fisetinidol, in contrast to the simpler fluorescence of the procyanidin monomers. This heterogeneity is attributed to differences in the photophysical properties of the aromatic A- and B-rings in fisetinidol. These differences are larger in fisetinidol than in catechin or epicatechin. The heterogeneity prevents determination by fluorescence of the conformations at the interflavan bond in the profisetinidins by the data analysis employed successfully with the procyanidins.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00294891
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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