Skip to main content

Research Repository

See what's under the surface

Advanced Search

A structural study of Acacia nilotica and Acacia modesta gums

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

Authors

Shazma Massey

William MacNaughtan

Huw E.L. Williams

Bettina Wolf

Mohammad S. Iqbal



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.

Journal Article Type Article
Publication Date Nov 1, 2017
Journal Carbohydrate Polymers
Print ISSN 0144-8617
Electronic ISSN 1879-1344
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 175
Pages 207-215
APA6 Citation 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. https://doi.org/10.1016/j.carbpol.2017.07.065
DOI https://doi.org/10.1016/j.carbpol.2017.07.065
Keywords Arabinans; Acacia modesta; Acacia nilotica; Polysaccharides; NMR spectroscopy
Publisher URL http://www.sciencedirect.com/science/article/pii/S014486171730841X
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

Files

1-s2.0-S014486171730841X-main-AN.pdf (1.7 Mb)
PDF

Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





You might also like



Downloadable Citations

;