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NMR spectroscopy of 13C-enriched polysaccharides: application of 13C–13C TOCSY to sugars of different configuration

✍ Scribed by Alexandra Kjellberg; Toshiaki Nishida; Andrej Weintraub; Göran Widmalm

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
217 KB
Volume
36
Category
Article
ISSN
0749-1581

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✦ Synopsis

13CÈ13C 2D TOCSY experiments were applied, with both carbon-13 and proton detection, to alleviate the problem of limited 1HÈ1H coherence transfer in certain sugars, e.g. those with the manno or galacto conÐguration. The 13CÈ13C couplings are not as dependent on the di †erent sugar geometries and can be up to 50 times larger, i.e.

vs.

For bacterial polysaccharides, ca. 104È105, loss of magnetization can be severe 1J CC 3J HH . M r owing to long delays in 1HÈ1H TOCSY experiments, and these are circumvented by applying the spin lock on the 13C nuclei.

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