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Dissolution and regeneration of starch in hydroxyl-functionalized ionic liquid aqueous solution.
Xiaoyan Tan1, Yitao Huang2, Umair Muhammad3
1College of Pharmacy, Shenzhen Technology University, Shenzhen 518118, China; College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211816, China.
International Journal of Biological Macromolecules
|March 11, 2024
Summary
Researchers explored hydroxyl-functionalized ionic liquids for starch dissolution. The synthesized ionic liquid 1-(2,3-dihydroxypropyl)-3-methylimidazole chloride ([Dhpmim][Cl]) effectively dissolved starch, showing potential for materials production.
Area of Science:
- Materials Science
- Green Chemistry
- Polymer Chemistry
Background:
- Effective starch dissolution is crucial for its modification and the production of advanced materials.
- Traditional solvents often pose environmental concerns, driving the search for sustainable alternatives.
- Hydroxyl-functionalized ionic liquids (ILs) present a promising avenue due to their tunable properties and potential for efficient biomass processing.
Purpose of the Study:
- To investigate the efficacy of a synthesized hydroxyl-functionalized ionic liquid, 1-(2,3-dihydroxypropyl)-3-methylimidazole chloride ([Dhpmim][Cl]), as a solvent for starch.
- To determine the optimal conditions for starch dissolution in [Dhpmim][Cl] and its aqueous mixtures.
- To analyze the structural and thermal properties of starch regenerated from the ionic liquid solvent system.
Main Methods:
- Synthesis of the hydroxyl-functionalized ionic liquid 1-(2,3-dihydroxypropyl)-3-methylimidazole chloride ([Dhpmim][Cl]).
- Starch dissolution experiments in neat [Dhpmim][Cl] and its aqueous mixtures at varying concentrations and temperatures.
- Characterization of regenerated starch using techniques such as X-ray diffraction (XRD) and differential scanning calorimetry (DSC).
- Density Functional Theory (DFT) simulations to understand solvent-solute interactions.
Main Results:
- Complete dissolution of 5.35 wt% starch in [Dhpmim][Cl] was achieved within 2 hours at 100 °C.
- Starch solubility in [Dhpmim][Cl]-water mixtures showed an initial increase followed by a decrease with rising water content, with optimal solubility at a 1:9 water:IL ratio (9.28 wt%).
- Regenerated starch retained its molecular structure but exhibited a transformation from A-type to V-type crystallinity, with reduced relative crystallinity (12.4%) and thermal stability compared to native starch (25.2%).
Conclusions:
- The hydroxyl-functionalized ionic liquid [Dhpmim][Cl] and its aqueous solutions are effective solvents for starch dissolution.
- The [Dhpmim][Cl] solvent system facilitates starch modification without chemical derivatization.
- The observed changes in crystallinity and thermal stability of regenerated starch highlight the potential for tailoring starch properties through IL-based processing.
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