Journal
CARBOHYDRATE POLYMERS
Volume 136, Issue -, Pages 266-273Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2015.09.007
Keywords
Starch; ZnCl2 aqueous solution; Non-derivatizing solvent; Dissolution; Zinc-starch complex
Categories
Funding
- National Natural Science Foundation of China (NSFC) [21146011, 21106023]
- Natural Science Foundation of Guangdong Province [9151008901000169]
- Technology Planning Project of Guangdong Province [2013B010403030]
- Science and Technology Projects supported by Guangzhou Education Bureau [1201410965]
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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 degrees 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+ inZnCl(2) 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 degrees C, with the dissolving time being 4 h. Using Fourier-transform infrared (FTIR), solid state C-13 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. (C) 2015 Elsevier Ltd. All rights reserved.
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