玉米秸秆木质素降解过程的CP/MAS ^(13)CNMR和SEM表征

CP/MAS ^(13)CNMR and SEM Characterization of Corn Stover Lignin Degradation

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 structure changes of corn stover lignin treated by Phanerochaete chrysosporiurn were studied by CP/MAS ^13CNMR and SEM. CP/MAS 13CNMR Results showed that bond/3-0-4 didn＇t be degraded,the content of --OCH3 increased after degradation, S/G value decreased,and syringyl structure was priority to take part in the reaction. SEM Results showed that the surface holes of corn stover lignin increased both in number and in volume, and the particle matters reduced, mainly due to the degradation caused by carbohydrate, there were cellulose and hemieellulose more easily degraded than lignin in the sample. CP/MAS ^13CNMR Provides the possibility of qualitative and quantitative characterization for wood materials structure,which is a strong supple- ment to the traditional quantitative characterization methods,and has some research significance.