Journal
CARBOHYDRATE POLYMERS
Volume 94, Issue 1, Pages 520-530Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2013.01.024
Keywords
Starch; Biopolymer dissolution; Ionic liquid; 1-Ethyl-3-methylimidazolium acetate; Gelatinization; Phase transition
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Funding
- Australian Research Council (ARC) [120100344]
- Ministry of iTaukei Affairs, Fiji
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This work revealed that the interactions between starch, the ionic liquid 1-ethyl-3-methylimidazolium acetate ([Emim][OAc]), and water might contribute to the phase transition (gelatinization, dissolution, or both) of native starch at reduced temperature. Using mixtures of water and [Emim][OAc] at certain ratios (7.2/1 and 10.8/1 mol/mol), both the gelatinization and dissolution of the starch occur competitively, but also in a synergistic manner. At lower [Emim][OAc] concentration (water/[Emim][OAc] molar ratio >= 25.0/1), mainly gelatinization occurs which is slightly impeded by the strong interaction between water and [Emim][OAc]; while at higher [Emim][OAc] concentration (water/[Emim][OAc] molar ratio <= 2.8/1), the dissolution of starch is the major form of phase transition, possibly restricted by the difficulty of [Emim][OAc] to interact with starch. (C) 2013 Elsevier Ltd. All rights reserved.
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