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| 水热-二元催化乙醇法分离麦草组分及结构解析 |
| Wheat Straw Components Separation by Hydrothermal Binary Catalytic Ethanol Method and Its Structure Analyses |
| 收稿日期：2020-05-29 |
| DOI：10.11980/j.issn.0254-508X.2020.10.005 |
| 关键词: 水热-二元催化乙醇法 结构研究 组分分离 半纤维素 木质素 |
| Key Words:hydrothermal binary catalytic ethanol method structural research component separation hemicellulose lignin |
| 基金项目:国家“十三五”重点研发计划项目（2017YFB0307901）；陕西省重点研发计划项目（2017ZDXM-SF-090）。 |
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| 摘要:研究了水热-二元催化乙醇法高效分离麦草3种主要组分的效果，然后采用醇沉法和稀释沉淀法分别分离提取出半纤维素和木质素。并通过高效阴离子色谱仪、傅里叶变换红外光谱仪、核磁共振波谱仪对分离物的结构进行了表征。结果表明，水热-二元催化乙醇法分离麦草3种主要组分方法可行，且提取效果较好。醇沉法半纤维素提取率为38.1%，稀释沉淀法木质素提取率为55.5%，粗纤维素得率为40.7%。分离得到的半纤维素聚糖的主链由D-吡喃式木糖以（1，4）-β-糖苷键连接形成，支链为4-O-甲基-α-D-吡喃式葡萄糖醛酸基、α-L-呋喃式阿拉伯糖基和乙酰基。分离物木质素具有典型的G-S-H型结构，且木质素中S型木质素含量多于G型木质素。 |
| Abstract:The effect of hydrothermal binary catalytic ethanol method on the separation of three main components of wheat straw was studied. Then hemicellulose and lignin were separated and extracted by alcohol precipitation method and dilution precipitation method respectively. The structures of the separated substances were characterized by high performance anion chromatograph， Fourier transform infrared spectrometer and nuclear magnetic resonance spectrometer. The results showed that the method of hydrothermal binary catalytic ethanol separation was feasible， and the extraction effect was good. The extraction rates of hemicellulose， lignin and crude cellulose were 38.1%， 55.5% and 40.7%， respectively. The main chain of hemicellulosan was formed by D-xylopyranosyl with （1，4）-β-glycosidic bond. The branched chains were 4-O-methyl-α-D-pyranosyl， α-L-furanoarabinoyl and acetyl. The lignin isolated had a typical G-S-H structure， and the content of S-type lignin was more than that of G-type lignin. |
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