Zinc chloride aqueous solution as a solvent for starch

Lin, Meiying, Shang, Xiaoqin, Liu, Peng, Xie, Fengwei, Chen, Xiaodong, Sun, Yongyi and Wan, Junyan (2016) Zinc chloride aqueous solution as a solvent for starch. Carbohydrate Polymers, 136 266-273. doi:10.1016/j.carbpol.2015.09.007

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Author Lin, Meiying
Shang, Xiaoqin
Liu, Peng
Xie, Fengwei
Chen, Xiaodong
Sun, Yongyi
Wan, Junyan
Title Zinc chloride aqueous solution as a solvent for starch
Journal name Carbohydrate Polymers   Check publisher's open access policy
ISSN 0144-8617
Publication date 2016-01-20
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.carbpol.2015.09.007
Open Access Status File (Author Post-print)
Volume 136
Start page 266
End page 273
Total pages 8
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Collection year 2017
Language eng
Formatted abstract
It is important to obtain starch-based homogeneous systems for starch modification. Regarding this, an important key point is to find cheap, low-cost and low-toxicity solvents to allow complete dissolution of starch and its easy regeneration. This study reveals that a ZnCl2 aqueous solution is a good non-derivatizing solvent for starch at 50 °C, and can completely dissolve starch granules. The possible formation of a “zinc–starch complex” might account for the dissolution; and the degradation of starch, which was caused by the H+ inZnCl2 aqueous solution, could not contribute to full dissolution. From polarized light microscopic observation combined with the solution turbidity results, it was found that the lowest ZnCl2 concentration for full dissolution was 29.6 wt.% at 50 °C, with the dissolving time being 4 h. Using Fourier-transform infrared (FTIR), solid state 13C nuclear magnetic resonance (NMR), and X-ray diffraction (XRD), it was revealed that ZnCl2 solution had no chemical reaction with starch glucosides, but only weakened starch hydrogen bonding and converted the crystalline regions to amorphous regions. In addition, as shown by intrinsic viscosity and thermogravimetric analysis (TGA), ZnCl2 solution caused degradation of starch macromolecules, which was more serious with a higher concentration of ZnCl2 solution.
Keyword Dissolution
Non derivatizing solvent
Zinc starch complex
Aqueous Solutions
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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