烟梗中木素的结构分析

Study on the Structure of MWL of Tobacco Stem

关键词:  烟梗  磨木木素  红外光谱  核磁共振光谱

Key Words:tobacco stem  milled wood lignin  FT-IR  13C-NMR

摘要:通过制备烟梗磨木木素（MWL），分析了烟梗MWL的化学组成与结构。结果表明，烟梗MWL得率为3.0%（对绝干烟梗），提取率达到57.0%（烟梗中木素的含量为5.3%）；采用红外光谱仪（FT-IR）和核磁共振光谱（13C-NMR）对烟梗MWL结构进行分析，得出烟梗MWL结构中，可能主要由愈创木基结构单元和紫丁香基结构单元组成，结构单元间可能主要通过β-O-4、5-5′和β-5等化学键连接，且可能以β-O-4结构单元和β-5结构单元为主。

Abstract:Recomsisted Tobacco sheet was increasingly used in cigarettes thanks to its low tar and nicotine in smoke. But there were some shortcomings in tobacco sheet, for example, it released wood odour in smoking, which affected the smoking quality of reconstituted tobacco. Therefore, we needed to study the structure of tobacco stem lignin(milled wood lignin, MWL), it could provide necessary academic basis for improving the mechanical properties and quality of reconstitued tobacco. The results showed that, the yield of MWL was 3.0%( based on dry raw materials), the extraction rate of MWL was 57.0%(the lignin contents of tobacco stem was 5.3%); The structure of MWL of tobacco stem was analyzed by FT-IR and 13C-NMR, the two types of structural unit for MWL of tobacco stem were mainly syringylreleased units and guaiacyl units. It was proved that β-O-4, 5-5, β-5 was probably the main type linkages between lignin, and the β-O-4 group and β-5 group were main groups.