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A structural study of Acacia nilotica and Acacia modesta gums

Massey, Shazma; MacNaughtan, William; Williams, Huw E.L.; Wolf, Bettina; Iqbal, Mohammad S.


Shazma Massey

William MacNaughtan

Huw E.L. Williams

Bettina Wolf

Mohammad S. Iqbal


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.


Massey, S., MacNaughtan, W., Williams, H. E., Wolf, B., & Iqbal, M. S. (2017). A structural study of Acacia nilotica and Acacia modesta gums. Carbohydrate Polymers, 175, 207-215.

Journal Article Type Article
Acceptance Date Jul 21, 2017
Online Publication Date Jul 24, 2017
Publication Date Nov 1, 2017
Deposit Date Aug 15, 2017
Publicly Available Date Aug 15, 2017
Journal Carbohydrate Polymers
Print ISSN 0144-8617
Electronic ISSN 1879-1344
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 175
Pages 207-215
Keywords Arabinans; Acacia modesta; Acacia nilotica; Polysaccharides; NMR spectroscopy
Public URL
Publisher URL
Copyright Statement Copyright information regarding this work can be found at the following address:


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