Manifestation of anomeric form, ring structure, and linkage in the 13c-n.m.r. spectra of oligomers and polymers containing D-fructose: maltulose, isomaltulose, sucrose, leucrose, 1-kestose, nystose, inulin, and grass levan
✍ Scribed by Harold C. Jarrell; Thomas F. Conway; Patrick Moyna; Ian C.P. Smith
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- English
- Weight
- 929 KB
- Volume
- 76
- Category
- Article
- ISSN
- 0008-6215
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✦ Synopsis
13C-N m.r.
. spectroscopy has been used to determine the equilibrium composition of solutions of maltulose and isomaltulose in deuterium oxide. Resonance assignments have been made for maltulose, isomaltulose, sucrose, leucrose, I-kestose, nystose, inulin, and grass levan. Some earlier assignments for sucrose and grass levan are corrected_ The resonances of the D-glucopyranosyl group in maltulose and isomaltulose have been observed to be sensitive to the ring and anomeric forms of the adjacent D-fructose residue. Spin-lattice relaxation-times (T1) and nuclear Overhauser enhancement factors (n.0.e.f.) for the carbon atoms of the D-fructofuranosyl residues of inulin have been measured, and used in conjunction with deuteration, to aid in resonance and linkage assignments.