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Application of a selective HSQC experiment to measure interglycosidic heteronuclear long-range coupling constants in cyclodextrins

✍ Scribed by Peter Forgo; Valerian T. D'Souza

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 87 KB
Volume: 37
Category: Article
ISSN: 0749-1581
DOI: 10.1002/(sici)1097-458x(199901)37:1<48::aid-mrc414>3.0.co;2-3

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✦ Synopsis

A selective one-dimensional HSQC experiment was used to obtain heteronuclear long-range coupling constants for native and chemically modiÐed cyclodextrins (3,6-anhydro-b-cyclodextrin) and a non-covalent complex of a-cyclodextrin with p-nitrophenol. Selective excitation was performed on C-4 in the a-glucose units using DANTE hard pulse trains. The measured heteronuclear long-range coupling constants have similar values for all natural cyclodextrins. The high value of these coupling constants indicates that the low dihedral angle between H-1 and C-4 found in the solid state is retained in solution. Chemical modiÐcation or complex formation, however, decreases the coupling constant by increasing the dihedral angle between these nuclei.

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