Insight into the interaction between arabinoxylan and imidazolium acetate-based ionic liquids

Lifang Hu; Hong Peng; Yu Zhang; Qi Xia; Hongwei He; Roger Ruan; Yuhuan Liu; Aihong Liu

doi:10.1016/j.carbpol.2019.115699

Insight into the interaction between arabinoxylan and imidazolium acetate-based ionic liquids

Carbohydr Polym. 2020 Mar 1:231:115699. doi: 10.1016/j.carbpol.2019.115699. Epub 2019 Nov 30.

Authors

Lifang Hu¹, Hong Peng², Yu Zhang¹, Qi Xia¹, Hongwei He¹, Roger Ruan¹, Yuhuan Liu¹, Aihong Liu³

Affiliations

¹ Engineering Research Center of Biomass Conversion, Ministry of Education, Nanchang University, Nanchang, Jiangxi 330047, PR China.
² Engineering Research Center of Biomass Conversion, Ministry of Education, Nanchang University, Nanchang, Jiangxi 330047, PR China. Electronic address: penghong@ncu.edu.cn.
³ Center of Analysis and Testing, Nanchang University, Nanchang, Jiangxi 330047, PR China.

PMID: 31888847
DOI: 10.1016/j.carbpol.2019.115699

Abstract

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 ¹H and ¹³C 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.

Keywords: Arabinoxylan; Hemicellulose; Hydrogen bond; Imidazolium ionic liquid; Solubility.