Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 5, Issue 5, Pages 3737-3741Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b00784
Keywords
Starch; Dissolution; Aqueous ionic liquid; 1-Ethyl-3-methylimidazolium acetate; Solvent effects
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Funding
- Australian Research Council (ARC) [120100344]
- Hubei Provincial Natural Science Foundation of China [2016CFB142]
- Fundamental Research Funds for the Central Universities [2662016QD008]
- Open Project Program of Provincial Key Laboratory of Green Processing Technology and Product Safety of Natural Products [201602]
- Canada Excellence Research Chairs Program
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With increased awareness of global sustainability, there has been growing interest in the preparation of materials from natural, eco-friendly polymers (i.e., biopolymers). Nonetheless, despite their enormous application potential, biopolymers (starch, etc.) have a native semicrystalline structure with strong hydrogen bonding, and require use of solvents to improve their processability. However, the dissolution/processing of natural biopolymers such as starch often requires heating and thus significant energy input. Herein, we report an aqueous ionic liquid for fast and facile dissolution of starch, a typical semicrystalline natural polymer, under ambient conditions. The ionic liquid used is 1-ethyl-3-methylimidazolium acetate ([C(2)mim][OAc]). In particular, it is revealed that 0.15:1 mol/mol [C(2)mim][OAc]:water mixture disintegrates the sophisticated granule structure of native starch without apparently decreasing the molecular mass within 1 h at room temperature (i.e., 28 degrees C). In addition, this process did not result in any undesired derivatization. The discovery of this phenomenon could provide guidance for rationally designing green processes for chemical and biological engineering for the utilization of promising natural biopolymers.
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