ISSN:
0006-3525
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
A variety of nmr transient techniques demonstrate the absence of domain structures in powders of α- and β-cyclodextrins, dextran B512F, and their “deuterated” analogs where deuterium replaces exchangeable protons. Cyclodextrins and dextran are inferred to be homogeneously ordered and disordered one-phase systems, respectively. We show how erroneous results concerning the presence and sizes of rigid and mobile domains can be reached from the interpretations of two-component free induction decays and spin-lattice relaxation behavior of polysaccharides. In our approach, we have measured 1H free induction decays and lineshapes, and 1H spin-lattice and dipolar relaxation times, in addition to using Goldman-Shen experiments and 13C cross-polarization magic-angel sample spinning. Self-consistent nmr results are suggested as essential means to corroborate conclusions concerning domain structures in biopolymers.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/bip.360260606
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