Polysaccharide structures and interactions in a lithium chloride/urea/water solvent
| Autor: | Charles Winkworth-Smith, Timothy J. Foster, William MacNaughtan |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
inorganic chemicals
Polymers and Plastics 02 engineering and technology 010402 general chemistry Polysaccharide 01 natural sciences chemistry.chemical_compound Polysaccharides Materials Chemistry Urea Organic chemistry Cellulose Xyloglucan GeneralLiterature_REFERENCE(e.g. dictionaries encyclopedias glossaries) chemistry.chemical_classification Konjac glucomannan Viscosity Organic Chemistry Water food and beverages 021001 nanoscience & nanotechnology 0104 chemical sciences Molecular Weight Solvent Lithium chloride chemistry Galactomannan Solvents Locust bean gum Solvent effects 0210 nano-technology Nuclear chemistry |
| Zdroj: | Carbohydrate Polymers. 149:231-241 |
| ISSN: | 0144-8617 1879-1344 |
| DOI: | 10.1016/j.carbpol.2016.04.102 |
| Popis: | The molten salt hydrate, lithium chloride (LiCl)/urea/water has previously been shown to swell cellulose, but there has so far been no work done to explore its effect on other polysaccharides. In this paper we have investigated the solvent effects of LiCl/urea/water on four natural polysaccharides. Fenugreek gum and xyloglucan, which are both highly branched, were found to increase in viscosity in LiCl/urea/water relative to water, possibly due to the breakage of all intra-molecular associations whereas the viscosity of konjac glucomannan which is predominantly unbranched did not change. Locust bean gum (LBG) had a lower viscosity in LiCl/urea/water compared to water due to the disruption of aggregates. Confocal microscopy showed that fenugreek gum and LBG are able to bind to cellulose in water, however, the conformational change of fenugreek gum in these solvent conditions inhibited it from binding to cellulose in LiCl/urea/water whereas conformational change allowed xyloglucan to bind to cellulose in LiCl/urea/water whilst it was unable to bind in water. Konjac glucomannan did not bind to cellulose in either solvent system. These results provide new insights into the impact of polysaccharide fine structure on conformational change in different solvent environments. |
| Databáze: | OpenAIRE |
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