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Insight into the interaction between arabinoxylan and imidazolium acetate-based ionic liquids
Lifang Hu1, Hong Peng1, Yu Zhang1
1Engineering Research Center of Biomass Conversion, Ministry of Education, Nanchang University, Nanchang, Jiangxi 330047, PR China.
Carbohydrate Polymers
|January 1, 2020
Summary
Six ionic liquids (ILs) with acetate anions were tested for dissolving arabinoxylan. 1-butyl-3-methylimidazolium acetate showed the highest solubility, with acetate anion being the primary factor.
Area of Science:
- Biomass Dissolution
- Ionic Liquids Chemistry
- Polymer Science
Background:
- Arabinoxylan is a major hemicellulose component in plant biomass.
- Efficiently dissolving arabinoxylan is crucial for its valorization.
- Ionic liquids offer tunable properties for biomass processing.
Purpose of the Study:
- To investigate the solubility of arabinoxylan in various ionic liquids.
- To elucidate the dissolution mechanism using spectroscopic techniques.
- To evaluate the role of cation structure and acetate anion in arabinoxylan solubilization.
Main Methods:
- Dissolution of arabinoxylan in six different imidazolium acetate ionic liquids.
- Solubility determination across varying arabinoxylan-to-IL mass ratios.
- Nuclear Magnetic Resonance (NMR) spectroscopy (1H and 13C) for mechanism elucidation.
- Assessment of recycled ionic liquids for arabinoxylan dissolution.
Main Results:
- Arabinoxylan solubility followed the order: BmimAc > EmimAc > AmimAc > PrmimAc > HOemimAc > HmimAc.
- The acetate anion was the dominant factor in arabinoxylan solubilization.
- Cation structure influenced the hydrogen bond accepting ability of the acetate anion.
- Increased arabinoxylan loading enhanced hydrogen bonding with ILs.
- Recycled ILs exhibited reduced solubility and hydrogen bonding strength due to impurities.
Conclusions:
- Ionic liquid choice, particularly the acetate anion and cation structure, significantly impacts arabinoxylan solubility.
- Hydrogen bonding interactions are key to the dissolution process.
- Impurities in recycled ionic liquids negatively affect arabinoxylan dissolution efficiency.
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