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http://digitalrepository.fccollege.edu.pk/handle/123456789/477
Title: | A structural study of Acacia nilotica and Acacia modesta gums |
Authors: | Iqbal, Mohammad S. Massey, Shazma MacNaughtanb, William Williams, Huw E.L. Wolf, Bettina |
Keywords: | Chemistry |
Issue Date: | 24-Jul-2017 |
Publisher: | Elsevier |
Abstract: | Superficially similar carbohydrate polymers from similar sources can have dramatically different charac-teristics. This work seeks to examine the molecular properties responsible for these differences. Protonsresponsible for cross-polarization in the anomeric region of Acacia nilotica (AN) were replaced easily bydeuterium, but not for Acacia modesta (AM). Time constants describing the mobility and cross-polarizationtransfer were both found to be lower for AM. Variable contact time experiments showed poorer fits andmore heterogeneity for AN. Solution state HSQC experiments showed a lower number of environmentsin the anomeric region for AM. The relaxation time T2of AM solutions had a lower value consistent witha higher viscosity. The Tg of solutions were −14.5◦C AN and −18.5◦C AM. These results form a largelyself-consistent picture of molecular differences between AN and AM, suggesting a more compact butheterogeneous structure for AN and more branching in the case of AM. |
URI: | http://localhost:8080/xmlui/handle/123456789/477 |
Appears in Collections: | Chemistry Department |
Files in This Item:
File | Description | Size | Format | |
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CP2017.pdf | 1.83 MB | Adobe PDF | View/Open |
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