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利用黄孢原毛平革菌对玉米秸秆木质素进行降解处理,通过CP/MAS 13 CNMR和SEM研究降解过程中木质素的结构变化。CP/MAS 13 CNMR结果表明:玉米秸秆木质素降解过程中,作为木质素结构单元主要连接方式的β-O-4键基本上没有被降解;木质素单位苯环的甲氧基含量稍有增加;S/G值降低,推断反应过程中紫丁香基优先参与反应。SEM结果表明:降解后的木质素空穴增多且增大、颗粒物质减少,主要是由于酶解木质素中大量碳水化合物的降解所致;比木质素更容易降解的纤维素和半纤维素也存在于样品中。CP/MAS 13 CNMR为木质纤维原料结构的定性和初步定量提供了可能,是传统定量表征手段的有力补充,具有一定的研究意义。
The degradation of lignin from corn stalk was carried out by Phanerochaete chrysosporium, and the structural changes of lignin during degradation were studied by CP / MAS 13 CNMR and SEM. The results of CP / MAS 13 CNMR showed that the β-O-4 bond, which is the main lignin structural unit, was not degraded during lignin degradation of corn stover. The content of methoxy group in the benzene ring of lignin increased slightly ; S / G value decreased, presumably during the reaction of lilac based priority reaction. The results of SEM showed that the number of lignin cavities increased and increased after the degradation, and the reduction of particulate matter was mainly caused by the degradation of a large amount of carbohydrates in the enzymatic lignin. The degradation of cellulose and hemicellulose more easily than lignin Exist in the sample. CP / MAS 13 CNMR provides the possibility of qualitative and preliminary quantification of the structure of lignocellulosic raw materials and is a powerful complement to traditional quantitative characterization methods, which is of certain research significance.