摘要
酶与仿酶漂白是近年来发展起来的环境友好型漂白技术,但是人们对酶与仿酶体系对纸浆中多糖以及木素-碳水化合物复合体(LCC)的降解作用尚缺乏系统的研究。本文对漆酶/ABTS体系和铁-羧酸(Fe-CA)/H2O2仿酶体系处理前后废水中多糖组分进行了定量分析,进一步了解漆酶与仿酶体系作用下麦草浆中多糖组分及LCC降解机理。研究发现,经漆酶处理后的麦草浆废水中存在葡萄糖和以水溶性低聚阿拉伯糖,说明漆酶/ABTS体系对浆中纤维素作用较强,对半纤维素或LCC支链上的水溶性低聚阿拉伯糖降解能力较弱。而经仿酶处理后的麦草浆废水中能检测出阿拉伯糖和水溶性低聚葡萄糖和低聚木糖,说明Fe-CA/H2O2仿酶体系对浆中的半纤维素或LCC支链的聚阿拉伯糖的降解能力较强。
The enzymatic and biomimetic bleaching processes are environmentally friendly bleaching techniques. However, the degradation of polysaccharides and LCC of pulp by laccase and Fe - carboxyl acid （ Fe - CA） biomi- metic system has not been investigated systematically. In order to understand the chemical changes of polysaccha- rides of wheat straw pulp after treating by Laccase/ABTS system and Fe- CA/H2O2 biomimetic system, carbohy- drates in the waste water was measured quantitatively. It is found that free glucose and oligoarabinan was released after treating with Laccase/ABTS system. This indicates the relative serious degradation of cellulose and weak damage on branched hemicellulose and LCC. Whereas, free arabinose, oligoglucan and oligoxylan were found in the treatment of Fe - CA/H2O2 biomimetic system. This indicates that a part of hemicellulose and LCC can be degraded seriously with weak attack on cellulose.
出处
《造纸科学与技术》
2015年第4期64-68,60,共6页
Paper Science & Technology
基金
国家自然科学基金项目(31070512
31370574)
