用不同酸助溶剂对杨木进行分级：木质素溶解行为及机理评价。
Fractionation of poplar wood with different acid hydrotropes: Lignin dissolution behavior and mechanism evaluation.
机构信息
Key Laboratory of New Materials and Facilities for Rural Renewable Energy of Ministry of Agriculture and Rural Affairs, College of Mechanical & Electrical Engineering, Henan International Joint Laboratory of Biomass Energy and Nanomaterials, Henan Agricultural University, Zhengzhou 450002, China.
Key Laboratory of New Materials and Facilities for Rural Renewable Energy of Ministry of Agriculture and Rural Affairs, College of Mechanical & Electrical Engineering, Henan International Joint Laboratory of Biomass Energy and Nanomaterials, Henan Agricultural University, Zhengzhou 450002, China.
出版信息
Int J Biol Macromol. 2023 Dec 31;253(Pt 1):126696. doi: 10.1016/j.ijbiomac.2023.126696. Epub 2023 Sep 5.
Acid hydrotropes was considered a green medium for efficient wood fractionation at mild conditions. This study reported a comparative study on the dissolution of lignin in different acid hydrotropes, including p-toluenesulfonic acid (p-TsOH), 4-hydroxybenzenesulfonic acid (4-HSA), 5-sulfosalicylic acid (5-SSA), and maleic acid (MA). Under identical treatment conditions (80 °C, 60 min, and 70 % acid concentration), the removal of wood lignin varied significantly among four acid hydrotropes, 4-HSA exhibited the highest removal rate at 88.0 %, followed by p-TsOH at 81.2 %, 5-SSA at 51.1 %, and MA at 26.2 %. The molecular mechanism of the lignin dissolution was analyzed by quantum chemistry (QC) calculation and molecular dynamics (MD) simulation. The higher absorb free energy (E(absorb)) of the 4-HSA and veratrylglycerol-β-guaiacyl ether (VG) complex (E(absorb) = 17.97 kcal/mol), and the p-TsOH and VG complex (E(absorb) = 17.16 kcal/mol) contributed to a higher efficiency of lignin dissolution. Under the same level of lignin removal (~ 60 %), the four acid hydrotropes showed variations in the β-O-4 content of the extracted lignin: 4-HSA (3.1 %) < 5-SSA (10.4 %) < p-TsOH (15.9 %) < MA (63.7 %). The acidity and critical aggregation concentrations of acid hydrotropes were found to influence the content of β-O-4 bonds in the extracted lignin.
酸助溶剂被认为是在温和条件下有效分离木质素的绿色介质。本研究报道了不同酸助溶剂（对甲苯磺酸（p-TsOH）、4-羟基苯磺酸（4-HSA）、5-磺基水杨酸（5-SSA）和马来酸（MA））中木质素溶解的比较研究。在相同的处理条件（80°C，60 分钟，70%酸浓度）下，四种酸助溶剂中木质素的去除率有显著差异，4-HSA 的去除率最高，为 88.0%，其次是 p-TsOH，为 81.2%，5-SSA 为 51.1%，MA 为 26.2%。通过量子化学（QC）计算和分子动力学（MD）模拟分析了木质素溶解的分子机制。4-HSA 和愈创木基甘油-β-愈创木基醚（VG）络合物的更高吸收自由能（E(absorb)）（E(absorb) = 17.97 kcal/mol）和 p-TsOH 和 VG 络合物（E(absorb) = 17.16 kcal/mol）有助于提高木质素溶解的效率。在相同的木质素去除率（约 60%）下，四种酸助溶剂提取的木质素的β-O-4 含量存在差异：4-HSA（3.1%）<5-SSA（10.4%）<p-TsOH（15.9%）<MA（63.7%）。酸助溶剂的酸度和临界聚集浓度被发现影响提取木质素中β-O-4 键的含量。
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