NMR ANALYSIS OF LIGNIN FROM OLD NEWSPRINT LACCASE-VIOLURIC ACID SYSTEM DEINKED PULP
Old newsprint could be deinked by laccase-violuric acid system (LVS). In order to get a better understanding of lignin structural changes during the LVS deinking, lignin preparations from the control and LVS-deinked pulps were analyzed by 1H-NMR and 1H13C correlation 2D-NMR spectroscopy. Results indicated that the structure of lignin was changed during the LVS deinking. The contents of methoxyl, phenolic hydroxy, aliphatic hydroxy of lignins calculated according to 1H-NMR decreased during the LVS treatment. 1H-13C correlation 2D-NMR results showed that guaiacyl units were oxidized by LVS. β-O-4 and β-β type sub-structure in lignin were degraded, while stilbene, dibenzene methane and 5-5 type sub-structure were stable to LVs treatment.
laccase 2D-NMR deinking lignin
Xu Qinghua Qin Menghua Fu Yingjuan Shi Shulan
Shandong Key Laboratory of Pulp and Paper Engineering, Shandong Institute of Light Industry, Jinan, Shandong Key Laboratory of Pulp and Paper Engineering, Shandong Institute of Light Industry, Jinan, Tianjin University of Science and Technology Tianjin, 300222, China
国际会议
广州
英文
112-116
2006-11-08（万方平台首次上网日期，不代表论文的发表时间）