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Lignin Characterization of triploid clones of populus tomentosa carr.

Forestry Studies in China 2005年第2期7卷 52-56页

作者： Jin Xiao-juan Pu Jun-wen Xie Yi-min Takeshi Furuno Liu Xin-yu College of Material Science and Technology Beijing Forestry University Beijing 100083 P. R. China College of Paper and Environmental Engineering South China University of Technology Guangzhou 510641 P. R. China Faculty of Science and Engineer Shimane University Matsue 690-8504 Japan

In order to understand the structural characteristics of lignin in triploid clones ofpopulus tomentosa and its changes in the processes of pulping and bleaching, milled wood lignin （MWL）, lignin carbohydrate complex （LCC） and the residual lignin from kraft pulp （KP） and sulfite pulp （SP） were isolated and analyzed by Fourier transform infrared （FTIR） spectrum and ^13C nuclear magnetic resonance （NMR）. The most diagnostic peaks were assigned and the differences were discussed. The spectral patterns reveal that triploid P tomentosa shows the specific features of hardwood from temperate areas, but in the spectrum of FTIR, the strength ratio orAl270 cm^-1 to A1226 cm^-1 is 0.88, higher than the average of hardwood from temperate areas, which will make the lignin delignification more difficult during pulping and bleaching. The LCC from triploid P tomentosa is mainly composed of xyloglucan and glucuronic acid, and other glucides have much lower ratio. In LCC FTIR, there are three peaks at 1 427, 1 329 and 1 046 cm^-1, indicating that both semi-cellulose and cellulose could exist in LCC, and that there might be relationships between cellulose and lignin. Compared with the residual lignin from KP and SP, the condensed structure in KP is more than that in SP.

关键词： triploid clones of populus tomentosa carr. FTIR spectrum, ^13C-NMR MWL LCC

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