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Multiple-field carbon-13 NMR relaxation investigation on melezitose

✍ Scribed by Lena Mäler; Jan Lang; Göran Widmalm; Jozef Kowalewski

Book ID
102952472
Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
714 KB
Volume
33
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Multiple‐field carbon‐13 relaxation data are reported for melezitose, a trisaccharide consisting of two α‐linked glucose residues attached at positions 2 and 3 to a β‐linked fructofuranose residue. Values for T~1~ and NOE were measured at 4.7, 9.4, 11.8 and 14.1 T and transverse relaxation rates at 4.7 and 9.4 T. The measurements were carried out by means of standard techniques and by polarization transfer (INEPT) enhanced methods. The relaxation data were interpreted with the Lipari‐Szabo ‘model‐free’ approach. It was found that the relaxation data of the ring carbons can be described by the use of the truncated form of the Lipari‐Szabo equation. The global correlation time and order parameter for melizitose were calculated at two temperatures. For the exocyclic CH~2~ carbons, fits to obtain a local correlation time are reported. For three out of the four exocyclic carbons, a fast correlation time is obtained and their order parameter is lower than that for the ring carbons. The fructose C‐1 exocyclic carbon does not seem to display the same local motions as the other CH~2~ groups, and a higher order parameter is obtained indicating hindered local motion of that CH~2~ group.

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