Comprehensive study on the chemical structure of dioxane lignin from plantation Eucalyptus globulus wood

被引:208
作者
Evtuguin, DV [1 ]
Neto, CP
Silva, AMS
Domingues, PM
Amado, FML
Robert, D
Faix, O
机构
[1] Univ Aveiro, Dept Chem, P-3810 Aveiro, Portugal
[2] CERMAV, CNRS, F-38041 Grenoble, France
[3] Inst Holzchem & Chem Technol Holzes, Bundesforsch Anstalt Forst & Holzwirtschaft, D-21027 Hamburg, Germany
关键词
lignin; Eucalyptus globulus; functional group analysis; nitrobenzene oxidation; permanganate oxidation; thioacidolysis; analytical pyrolysis; ESIMS; H-1 NMR spectroscopy; C-13 NMR spectroscopy;
D O I
10.1021/jf010315d
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
Results of a comprehensive study on the chemical structure of lignin from plantation Eucalyptus globulus Labill are presented. Lignin has been isolated by a modified mild acidolysis method and thoroughly characterized by functional group analysis, by a series of degradation techniques (nitrobenzene oxidation, permanganate oxidation, thioacidolysis, and Py-GC-MS), and H-1 and C-13 NMR spectroscopy. Plantation Eucalyptus globulus lignin was found to be of the S/G type with an extremely high proportion of syringyl (S) units (82-86%) and a minor proportion of p-hydrophenyl propane (H) units (roughly 2-3 mol %). Unknown C-6 substituted and 4-O-5 ', type syringyl substructures represent about 65% of lignin "condensed" structures. Eucalypt lignin showed high abundance of beta -O-4 (0.56/C-6) structures and units linked by alpha -O-4 bonds (0.23/C-6). The proportion of phenylcoumaran structures was relatively low (0.03/C-6). Different kinds of beta-beta substructures (pino-/syringaresinol and isotaxiresinol types) in a total amount of 0.13/C-6 were detected. ESI-MS analysis revealed a wide molecular weight distribution of lignin with the center of gravity of mass distribution around 2500 u.
引用
收藏
页码:4252 / 4261
页数:10
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