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Residual 2H Quadrupolar couplings in weakly aligned carbohydrates

Lookup NU author(s): Professor Steve Homans


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We report a novel two-dimensional NMR pulse scheme for the 1H-detected observation of 2H in isotopically 13C, 2H-enriched carbohydrates. This scheme is used for the indirect observation of residual quadrupolar couplings in 13C, 2H-enriched methyl-β--glucopyranoside weakly aligned in a dilute lyotropic liquid-crystalline medium comprising 20% (w/v) dihexanoyl-phos- phatidylcholine/dimyristoyl-phosphatidylcholine (1:3 mol/mol) in D2O. The observed residual quadrupolar couplings are substantially larger than residual dipolar one-bond 13C–1H couplings under the same experimental conditions. These quadrupolar couplings are thus a useful alternative to dipolar couplings for the structural analysis of small molecules that align very weakly in dilute liquid-crystalline media. Moreover, since the quadrupolar coupling constant is very uniform throughout endocyclic deuterons of the carbohydrate, these data suggest that adoption of a single average value of this parameter in 2H relaxation studies on the glycan moieties of glycoproteins and glycopeptides is a valid assumption.

Publication metadata

Author(s): Kjellberg A, Homans SW

Publication type: Article

Publication status: Published

Journal: Journal of Magnetic Resonance

Year: 2001

Volume: 151

Issue: 1

Pages: 90-93

ISSN (print): 1090-7807

ISSN (electronic): 1096-0856

Publisher: Academic Press


DOI: 10.1006/jmre.2001.2361


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