Chemical reactivity of alkali lignin modified with laccase

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	Chemical reactivity of alkali lignin modified with laccase
	Sun, Yong ; Qiu, Xueqing ; Liu, Yunquan ; Sun Y(孙勇) ; Liu YQ(刘运权)
刊名	http://dx.doi.org/10.1016/j.biombioe.2013.02.006
	2013
关键词	NUCLEAR-MAGNETIC-RESONANCE MILLED WOOD LIGNIN NMR-SPECTROSCOPY WHEAT-STRAW TECHNICAL LIGNINS MODEL-COMPOUND IDENTIFICATION HARDWOOD BONDS ACID
英文摘要	National Key Basic Research Program [2010CB732201]; Ministry of Science and Technology of China, Natural Science Foundation of China [21106121]; Basic Foundation for Scientific Research of Universities from the Ministry of Education of China, Provincial RD Program [2010121077]; Economic and Trade Committee of Fujian Province of China [1270-K42004]; Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education; The modification of alkali lignin with laccase was investigated. The structural change of lignin was analyzed. The sulfonation reactivity was measured by the content of sulfonic group. The results showed the sulfonation reactivity increased to some extent under the condition of atmosphere pressure, but decreased under the condition of 0.3 MPa oxygen pressure. The analysis of Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR) and gel permeation chromatography (GPC) showed the cleavage of various ether linkages and demethylation took place in the structure of lignin to certain extent during modification with laccase, which contributed to the improvement of sulfonation reactivity. Under the condition of 0.3 MPa oxygen pressure, the ratio of s/g (guaiacyl/syringyl) increased after modification, which reduced the sulfonation reactivity of lignin. Simultaneously partial polymerization reaction, such as 4-O-5', beta-5, 5-5 and other reaction in the aromatic ring decreased the activity sites of C-2, C-5 and C-6. Abundant polymerization reaction of alpha-O increased stexic hindrance of C-2 and C-6 in aromatic ring, resulting in low sulfonation reactivity of lignin. (C) 2013 Elsevier Ltd. All rights reserved.
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/90265]
专题	能源院－已发表论文
推荐引用方式 GB/T 7714	Sun, Yong,Qiu, Xueqing,Liu, Yunquan,et al. Chemical reactivity of alkali lignin modified with laccase[J]. http://dx.doi.org/10.1016/j.biombioe.2013.02.006,2013.
APA	Sun, Yong,Qiu, Xueqing,Liu, Yunquan,孙勇,&刘运权.(2013).Chemical reactivity of alkali lignin modified with laccase.http://dx.doi.org/10.1016/j.biombioe.2013.02.006.
MLA	Sun, Yong,et al."Chemical reactivity of alkali lignin modified with laccase".http://dx.doi.org/10.1016/j.biombioe.2013.02.006 (2013).