摘要
分别采用常规磨木木素(MWL)分离法和作者提出的酶解/温和酸解木素(EAL)分离新技术对麦草木素进 行了分离,并利用定量31P-NMR、木素衍生化后再还原降解(DFRC)等技术较深入研究了分离得到的麦草木素官 能团含量、β芳基醚键的特性与含量、DBDO(dibenzodioxocins)结构等特性。同时,采用热重分析法初步评价了 麦草MWL木素、EAL木素、工业碱木素(TAL)的热解特性。结果表明,EAL木素具有得率与纯度高、分离方 法简便,更能较好地代表草类纤维细胞中的木素的优点。EAL木素大分子中总β芳基醚键数量为0．811mmol/L, 主要是由愈创木基和紫丁香基单元上的酚羟基形成。麦草木素中存在3种DBDO新型结构,含量为0．244mmol/L。 MWL和EAL木素的静态热解特性基本相同,而TAL木素与两者相比有较大差异。
The wheat straw traditional MWL （Milled wood lignin） and new EAL （Enzymatic hydrolysis/mild acidolysis lignin） were isolated. The functional groups content, β aryl-ether bonds content and the hnkage types, DBDO （dibenzodioxocins） structures were determined with quantitativen P-NMR, DFRC （Derivatization Followed by Reductive Cleavage）. Meanwhile, the thermochemical characteristics of wheat straw MWL, EAL and TAL were evaluated by thermogravimetry. Results showed that： EAL has high yield and purity, and the isolating proceeding procedure is simple, which has good representation of the wheat straw native lignin. The total β aryl-ether bonds content of EAL is 0.811mmol/L, which mainly originated from the phenolic hydroxyl group of guaiacyl and syringyl units. Wheat straw hgnin has three kinds of DBDO new structures, their content are 0.244mmol/L. The pyrogenation property of MWL and EAL has not obviously difference. However, the pyrogenation property of TAL is much different from the others two lignin.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2005年第4期523-528,共6页
Acta Energiae Solaris Sinica
基金
国家自然科学基金项目(30371138)中科院广州化学所纤维素化学重点实验室访问学者基金(创-109)教育部留学回国科研启动基金(教外司留[2003]406号)制浆造纸工程国家重点实验室开放基金(编0217)
