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首页> 外文期刊>RSC Advances >Anionic structural effect on the dissolution of arabinoxylan-rich hemicellulose in 1-butyl-3-methylimidazolium carboxylate-based ionic liquids
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Anionic structural effect on the dissolution of arabinoxylan-rich hemicellulose in 1-butyl-3-methylimidazolium carboxylate-based ionic liquids

机译：对富含阿拉伯氧基 - 甲基咪唑羧酸铵离子液体中富阿拉伯氧基富含半纤维素溶解的阴离子结构效应

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摘要

The exploration of a highly efficient and environment-friendly solvent for dissolving hemicellulose is significant. In this study, 1-butyl-3-methylimidazolium carboxylate ([Bmim]carboxylate)-based ionic liquids (ILs), including [Bmim]formate, [Bmim]acetate, [Bmim]propionate, and [Bmim]butyrate, were used as solvents to dissolve arabinoxylan-rich hemicellulose from bamboo. The hemicellulose solubility in the ILs was determined as a function of temperature. The interaction between the hemicellulose and the ILs was evaluated by using ~(1) H and ~(13) C NMR techniques. The hemicelluloses regenerated from the saturated IL solutions were characterized. Results showed that the temperature and structure of carboxylate anions deeply affected the hemicellulose solubility. The carboxylate anion played a more important role than the imidazolium cation in hemicellulose dissolution. The hydrogen bond that formed between the ILs and the hydroxyl groups at the XC2 position of xylopyranose units of hemicellulose was stronger than that between the ILs and the hydroxyl groups at XC3 position of xylopyranose units. The hydrogen bond strength between the hemicellulose and the ILs was affected by the alkyl chain of the carboxylate anion and the hemicellulose concentration. The disruption of the inter- and intra-molecular hydrogen bonds in hemicellulose by the ILs was responsible for the hemicellulose dissolution. The main chain of hemicellulose remained nearly unchanged during the dissolution process.
机译：对溶解半纤维素的高效和环保型溶剂的探索显着。在该研究中，使用了1-丁基-3-甲基咪唑鎓羧酸盐（[Bmim]羧酸盐）的离子液体（IL），包括[Bmim]甲酸酯，乙酸乙酯，[Bmim]丙酸盐和[Bmim]丁酸酯，丁酸酯作为溶于阿拉伯辛氧基的半纤维素的溶剂。 ILS中的半纤维素溶解度被确定为温度的函数。通过使用〜（1）H和〜（13）C NMR技术来评价半纤维素和ILS之间的相互作用。特征在于从饱和IL溶液中再生的半纤维素。结果表明，羧酸盐阴离子的温度和结构深深影响了半纤维素溶解度。羧酸盐阴离子比半纤维素溶解中的咪唑鎓阳离子发挥了更重要的作用。在XC2的半纤维素单位的XC2位置的ILS和羟基之间形成的氢键比在X嘧吡喃糖单位的XC3位置的ILS和羟基之间的位置较强。半纤维素和ILS之间的氢键强度受羧酸盐阴离子和半纤维素浓度的烷基链的影响。通过ILS的半纤维素中的和解分子内氢键的破坏负责半纤维素溶解。在溶解过程中，半纤维素的主链几乎保持不变。

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