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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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Official URL: http://dx.doi.org/10.1039/C5CP01176K

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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:
DateEvent
7 June 2015Published
8 April 2015Accepted
27 February 2015Submitted
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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