嗜黑液菌厌氧降解过程中木质素结构的变化

Change of Lignin Structure by Anaerobic Degradation of Black-liquor-philic

利用嗜黑液菌对木质素进行厌氧降解处理,研究在厌氧降解过程中,木质素的元素组成、分子量、结构基团的变化及其红外光谱和氢谱。结果表明,在厌氧降解过程中,分子量大于4 950的木质素将发生碎片化反应,尤其是木质素结构中的香豆满和松脂醇结构,以及β-O-4和β-β结构都因为发生断裂而消失,同时进一步发生脱甲氧基作用和脱羟基作用,生成了可溶性小分子化合物。

The study on anaerobic decomposed of lignin by black-liquor-philic fungus was carried out in this paper. The elemental components, molecular weight, fund and IR, 1^ H- NMR of lignin sample after anaerobic reaction were investigated. The result showed that in the anaerobic decomposition the lignin which molecular weight was bigger than 4 950 was fragmented. The coumaran, toupentine structure and β-O-4,β-β link disappeared because of fragmentation. At the same time, demethoxylation and dehydroxylation took place in the anaerobic reaction, and dissolvability lower molecular compound was produced.