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dc.contributor.authorSun, Yongzh_CN
dc.contributor.authorQiu, Xueqingzh_CN
dc.contributor.authorLiu, Yunquanzh_CN
dc.contributor.author孙勇zh_CN
dc.contributor.author刘运权zh_CN
dc.date.accessioned2015-07-22T07:07:43Z
dc.date.available2015-07-22T07:07:43Z
dc.date.issued2013zh_CN
dc.identifier.citationBIOMASS & BIOENERGY, 2013,55:198-204zh_CN
dc.identifier.otherWOS:000321595900020zh_CN
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/90265
dc.descriptionNational 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 Educationzh_CN
dc.description.abstractThe 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.zh_CN
dc.language.isoen_USzh_CN
dc.publisherPERGAMON-ELSEVIER SCIENCE LTDzh_CN
dc.source.urihttp://dx.doi.org/10.1016/j.biombioe.2013.02.006zh_CN
dc.subjectNUCLEAR-MAGNETIC-RESONANCEzh_CN
dc.subjectMILLED WOOD LIGNINzh_CN
dc.subjectNMR-SPECTROSCOPYzh_CN
dc.subjectWHEAT-STRAWzh_CN
dc.subjectTECHNICAL LIGNINSzh_CN
dc.subjectMODEL-COMPOUNDzh_CN
dc.subjectIDENTIFICATIONzh_CN
dc.subjectHARDWOODzh_CN
dc.subjectBONDSzh_CN
dc.subjectACIDzh_CN
dc.titleChemical reactivity of alkali lignin modified with laccasezh_CN
dc.typeArticlezh_CN


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