Journal
CARBOHYDRATE POLYMERS
Volume 231, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2019.115699
Keywords
Arabinoxylan; Imidazolium ionic liquid; Solubility; Hydrogen bond; Hemicellulose
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Funding
- National Natural Science Foundation of China [21666022]
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Herein, six ionic liquids (ILs) with different cations and the same anion of acetate (Ac-) were used to dissolve arabinoxylan. These ILs included N-methylimidazolium acetate (HmimAc), 1-ethyl-3-methylimidazolium acetate (EmimAc), 1-hydroxyethyl-3-methylimidazolium acetate (HOemimAc), 1-propyl-3-methylimidazolium acetate (PrmimAc), 1-allyl-3-methylimidazolium acetate (AmimAc), and 1-butyl-3-methylimidazolium acetate (BmimAc). The solubilities of arabinoxylan in these ILs were determined, and the dissolution mechanism was explained using H-1 and C-13 NMR techniques. The solubilities of arabinoxylan in the ILs were in the order: BmimAc > EmimAc > AmimAc > PrmimAc > HOemimAc > HmimAc. Both the cation and Ac- played an important role in the solubilization of arabinoxylan, but Ac- performed the major factor. The structure of cation greatly affected the hydrogen bond accepting ability of Ac-. Increasing the mass ratio of arabinoxylan to ILs resulted in stronger hydrogen bond between arabinoxylan and the ILs. Both the solubility and the strength of hydrogen-bonding interaction between arabinoxylan and the ILs decreased in the recycled ILs because of the impurities remained.
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