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  • 1
    ISSN: 0749-1581
    Keywords: 2D-J NMR heteronuclear spectroscopy ; Selective irradiation ; Long-range Proton—Carbon couplings ; Glycoside derivatives ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Long-range J(CH) values were measured for six glycoside derivatives by a selective 2D-J heteronuclear sequence. The values obtained are discussed in terms of conformational effects and constitute a valuable contribution to 2J and 3J comprehension.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0952-3499
    Keywords: Molecular modelling ; Polysaccharide-polysaccharide interactions ; Kappa carrageenan Mannan ; Galactomannan ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Molecular modelling has been used as a theoretical approach to investigate the kappa carrageenan structure and its interaction with mannan chains. Calculations revealed the existence of six minima for the kappa carrageenan structure in solution. Two of them were very close to the structure found in the solid state. The methodology allowed the calculation of the theoretical counterpart of the structures based on x-ray fibre diffractions studies. In the second step of this study, we have shown that there is the possibility of interactions between kappa carrageenan double helices and mannan chains. This interacting process is allowed by the flexibility of the mannan chains and structural changes of the kappa carrageenan double helices. The calculations suggest that the disaccaride mannan fragment might be required for recognition. The result of our investigation are in good agreement with a model of gel structure based on experimental data. This approach could be applied to simulate and predict other associations in molecular assemblies.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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