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Understanding the structural disorganization of starch in water-ionic liquid solutions
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Zhang, Binjia, Cheng, Ling, Xie, Fengwei, Li, Xiaoxi, Truss, Rowan W., Halley, Peter J., Shamshina, Julia L., Rogers, Robin D. and McNally, Tony (2015) Understanding the structural disorganization of starch in water-ionic liquid solutions. Physical Chemistry Chemical Physics, 17 (21). pp. 13860-13871. doi:10.1039/c5cp01176k
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WRAP-understanding-structural-disorganization-starch-water-ionic-liquid-solutions-Xie-2015.pdf - Accepted Version - Requires a PDF viewer. Download (1301Kb) | Preview |
Official URL: http://dx.doi.org/10.1039/C5CP01176K
Abstract
Using synchrotron X-ray scattering analyses and Fourier transform infrared spectroscopy, this work provides insights into the solvent effects of water : [C2mim][OAc] solutions on the disorganization of a starch semi-crystalline structure. When a certain ratio (10.2 : 1 mol/mol) of water : [C2mim][OAc] solution is used, the preferential hydrogen bonding between starch hydroxyls and [OAc]− anions results in the breakage of the hydrogen bonding network of starch and thus the disruption of starch lamellae. This greatly facilitates the disorganization of starch, which occurs much easier than in pure water. In contrast, when 90.8 : 1 (mol/mol) water : [C2mim][OAc] solution is used, the interactions between [OAc]− anions and water suppress the solvent effects on starch, thereby making the disorganization of starch less easy than in pure water. All these differences can be shown by changes in the lamellar and fractal structures: firstly, a preferable increase in the thickness of the crystalline lamellae rather than that of the amorphous lamellae causes an overall increase in the thickness of the semi-crystalline lamellae; then, the amorphous lamellae start to decrease probably due to the out-phasing of starch molecules from them; this forms a fractal gel on a larger scale (than the lamellae) which gradually decreases to a stable value as the temperature increases further. It is noteworthy that these changes occur at temperatures far below the transition temperature that is thermally detectable as is normally described. This hints to our future work that using certain aqueous ionic liquids for destructuration of the starch semi-crystalline structure is the key to realize green processes to obtain homogeneous amorphous materials.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QD Chemistry | ||||||||
| Divisions: | Faculty of Science > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
| Library of Congress Subject Headings (LCSH): | Starch, Ionic solutions, Electrolyte solutions, Fourier transform infrared spectroscopy, Polymers | ||||||||
| Journal or Publication Title: | Physical Chemistry Chemical Physics | ||||||||
| Publisher: | Royal Society of Chemistry | ||||||||
| ISSN: | 1463-9076 | ||||||||
| Official Date: | 7 June 2015 | ||||||||
| Dates: |
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| Volume: | 17 | ||||||||
| Number: | 21 | ||||||||
| Page Range: | pp. 13860-13871 | ||||||||
| DOI: | 10.1039/c5cp01176k | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Funder: | Australian Research Council (ARC), China Scholarship Council (CSC) |
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