Condensed Tannins
Contents for Condensed Tannins
NARRATIVE ON CONDENSED TANNINS
Current emphasis is on the complexes formed between condensed tannins and poly(L-proline).
Oligomers of a condensed tannin in (left) the helical and (right) the disordered conformations.
The transition between these two conformations is achieved by rotational isomeric state (RIS) transitions at the interflavan bond (the bond between monomer units).
The structures of some condensed tannins favor propagation of the same rotational isomeric state at consecutive interflavan bonds, thereby producing helices.
Other condensed tannins prefer a significant population of two different rotational isomeric states, producing the disordered conformation.
The transition between rotational isomeric states is slow on the time scale defined by the fluorescence lifetime of the condensed tannins, but is usually fast on the nmr time scale.
PREVIOUS COWORKERS ON CONDENSED TANNINS AT THE UNIVERSITY OF AKRON
RECENT PUBLICATIONS (1994-PRESENT) ON CONDENSED TANNINS
- Sun JS; Mattice WL "Interaction of catechin with poly(L-proline)" Polym. Bull. 1996, 37, 691-698.
- Steynberg JP; Brandt EV; Ferreira D; Helfer CA; Mattice, WL; Gornik D; Hemingway RW "Conformational analysis of oligomeric flavanoids. Part 2. Methylether acetate derivatives of profisetinidins" Magn. Reson. Chem. 1995, 33, 611-620.
- Helfer CA; Mattice WL "Conformation and dynamics of condensed tannins" Trends in Polym. Sci. 1995, 3, 117-122.
- Helfer CA; Sun JS; Matties MA; Mattice WL; Hemingway RW; Steynberg JP; Kelly LA "Implications of the fluorescence for the conformational analysis of polymeric profisetinidins and procyanidins" Polym. Bull. 1995, 34, 79-85.
- Mattice WL; Suter UW Conformational Theory of Large Molecules. The Rotational Isomeric State Model in Macromolecules Systems, Wiley, New York, 1994. (Book)
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August 16, 2001
Wayne L. Mattice: wlm@polymer.uakron.edu