Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, PR China.
Bioresour Technol. 2013 May;136:345-50. doi: 10.1016/j.biortech.2013.03.042. Epub 2013 Mar 15.
The effect of proposed integrated pretreatment on enzymatic hydrolysis of poplar wood has been reported in Part 1. Part 2 of this work investigated the detailed structural features of the isolated lignin and hemicellulosic fractions, which were obtained in high yields. The chemical structures of these polymer fractions obtained were compared with the corresponding alkaline lignin and hemicelluloses extracted from the raw material without ionic liquid (IL) pretreatment. The yields of alkaline lignin and hemicelluloses obviously increased after the IL pretreatment. No apparent degradation occurred for both lignin and hemicellulosic fractions during this integrated pretreatment process. The lignin fraction (RCEL), which obtained after the enzymatic hydrolysis, exhibited high percentages of β-O-4' aryl ether linkages and S/G ratio. It is believed that the high molecular weight and high purity hemicellulosic and lignin fractions obtained can serve as raw materials for the production of value-added products.
第 1 部分报道了拟议的综合预处理对杨木酶解的影响。本工作的第 2 部分研究了高得率分离得到的木质素和半纤维素级分的详细结构特征。这些聚合物级分的化学结构与未经离子液体（IL）预处理的原料中提取的相应碱性木质素和半纤维素进行了比较。IL 预处理后，碱性木质素和半纤维素的产率明显增加。在这个综合预处理过程中，木质素和半纤维素级分都没有明显降解。酶解后得到的木质素级分（RCEL）具有较高比例的β-O-4'芳基醚键和 S/G 比。可以认为，获得的高分子量和高纯度的半纤维素和木质素级分可以用作生产高附加值产品的原料。
