A structural study of Acacia nilotica and Acacia modesta gums

Massey, Shazma and MacNaughtan, William and Williams, Huw E.L. and Wolf, Bettina and Iqbal, Mohammad S. (2017) A structural study of Acacia nilotica and Acacia modesta gums. Carbohydrate Polymers, 175 . pp. 207-215. ISSN 1879-1344

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Abstract

Superficially similar carbohydrate polymers from similar sources can have dramatically different characteristics. This work seeks to examine the molecular properties responsible for these differences. Protons responsible for cross-polarization in the anomeric region of Acacia nilotica (AN) were replaced easily by deuterium, but not for Acacia modesta (AM). Time constants describing the mobility and cross-polarization transfer were both found to be lower for AM. Variable contact time experiments showed poorer fits and more heterogeneity for AN. Solution state HSQC experiments showed a lower number of environments in the anomeric region for AM. The relaxation time T2 of AM solutions had a lower value consistent with a higher viscosity. The Tg′ of solutions were −14.5 °C AN and −18.5 °C AM. These results form a largely self-consistent picture of molecular differences between AN and AM, suggesting a more compact but heterogeneous structure for AN and more branching in the case of AM.

Item Type: Article
Keywords: Arabinans; Acacia modesta; Acacia nilotica; Polysaccharides; NMR spectroscopy
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Biosciences
University of Nottingham, UK > Faculty of Science > School of Biosciences > Division of Food Sciences
Identification Number: 10.1016/j.carbpol.2017.07.065
Depositing User: Eprints, Support
Date Deposited: 15 Aug 2017 10:51
Last Modified: 18 Oct 2017 17:42
URI: http://eprints.nottingham.ac.uk/id/eprint/44902

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