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    Author(s): Carin A. Helfer; Joo-Sang Sun; Mark A. Matties; Wayne L. Mattice; Richard W. Hemingway; Jan P. Steynberg; Lisa A. Kelly
    Date: 1995
    Source: Polymer Bulletin 34:79-85
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (780 KB)

    Description

    The common monomeric units in the polymeric proeyanidins 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 detennination by fluorescence of the conformations at the interflavan bond in the profisetinidins by the data analysis employed successfully with the procyanidins.

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    Citation

    Helfer, Carin A.; Sun, Joo-Sang; Matties, Mark A.; Mattice, Wayne L.; Hemingway, Richard W.; Steynberg, Jan P.; Kelly, Lisa A. 1995. Implications of the fluorescence for the conformational analysis of polymeric profisetinidins and procyanidins. Polymer Bulletin 34:79-85

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