漆酶对不同漂段纸浆催化氧化木素的效果研究

The Catalytic Effect of Laccase on the Lignin Oxidation of Pulps from Different Bleaching Stages

关键词:  羧基  漆酶  谷氨酸  卡伯值

Key Words:carboxyl group  laccase  glutamic acid  Kappa number

摘要:以未漂硫酸盐桉木浆(Sp浆)、氧脱木素桉木浆(O浆)、H2O2漂白桉木浆(P浆)作为不同漂段原料,探讨漆酶-谷氨酸体系对不同漂段纸浆的催化效果。结果表明，漆酶催化总体上可使纸浆的卡伯值增大,纸浆的白度随之下降；漆酶协同谷氨酸可催化氧化纤维表面木素与相邻纤维上的木素发生自由基偶合反应,同时使纤维表面的微细纤维暴露出来,两者共同作用使相邻纤维形成更好的结合力,使纸浆的强度性能大幅度提升；谷氨酸可通过漆酶催化氧化作用连接到木素上,增加纤维原料中的羧基含量,Sp浆、O浆、P浆羧基含量分别较未处理纸浆提高20%、50%、43%。

Abstract:This study explored laccase-glutamic acid system catalytic effects on unbleached eucalyptus kraft pulp (Sp), oxygen delignified eucalyptus kraft pulp (O), and H₂O₂ bleached eucalyptus pulp (P). The results showed that the Kappa numbers of the pulps increased and whiteness decreased with laccase catalysis. Laccase catalysis oxidation of lignin on the surfaces combining the treatment of glutamic acid, free radical coupling reaction between the lignins on the surfaces of adjacent fibers formed a network structure and created closer contact between the fibers, the paper strength was enhanced significantly. The carboxyl groups of the pulps increased 20% for (Sp), 50% for (O) and 43% for (P) after combining laccase acid and glutamic acid treatment.