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Nmr studies on the presence of domain structures in polysaccharides

✍ Scribed by Serge Lacelle; Bernard C. Gerstein

Publisher: Wiley (John Wiley & Sons)
Year: 1987
Tongue: English
Weight: 715 KB
Volume: 26
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.360260606

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✦ Synopsis

A variety of nmr transient techniques demonstrate the absence of domain structures in powders of a-and /3-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 polysacchaxides. In our approach, we have measured 'H free induction decays and lineshapes, and 'H spin-lattice and dipolar relaxation times, in addition to using Goldman-Shen experiments and I3C crasspolarization magic-angle sample spinning. Self-consistent nmr results are suggested as essential means to corroborate conclusions concerning domain structures in biopolymers.

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