文献类型：期刊文献

英文题名：Chemical Groups and Structural Characterization of Brown-Rotted Pinus massoniana Lignin

作者：Sun, Qi-Ning[1] Qin, Te-Fu[1] Li, Gai-Yun[1]

第一作者：Sun, Qi-Ning

通信作者：Li, GY[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Key Lab Wood Sci & Technol, Beijing 100091, Peoples R China

年份：2009

卷号：14

期号：1

起止页码：19-33

外文期刊名：INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION

收录：;Scopus(收录号：2-s2.0-60849113716);WOS:【SCI-EXPANDED(收录号:WOS:000262514800002)】；

基金：The authors are grateful for the financial support by National Forestry Project of Scientific and Technical Supporting Programs of China during the 11th Five-year Plan ( No. 2006BAD18B1002) and Basic Research Fund for Central Nonprofit Institutes ( No. CAFINT2007C05).

语种：英文

外文关键词：Brown-rot fungi; Demethylation; ESR; 1H NMR; Milled wood lignins (MWLs); Oxidation

摘要：Milled wood lignins (MWLs) were isolated from sound and naturally brown-rotted Pinus massoniana (decayed by brown-rot fungus Poria cocos) by Bjorkman and Lundquist techniques. Both lignins were characterized by FT-IR, UV, 1H NMR, GPC, ESR spectroscopy, and chemical analyses methods. The results indicated the brown-rotted lignin was higher in the total acidic group, carbonyl, carboxyl, and phenol hydroxyl contents, but lower in methoxyl content than sound lignin. The C9 formulas were calculated for sound and brown-rotted lignin as C9H8.78O2.85(OCH3)0.83 and C9H8.63O3.01(OCH3)0.71, respectively. Sound lignin had 0.75 aliphatic hydroxyl group and 0.17 phenolic hydroxyl group per C9-unit, and brown-rotted lignin had 0.62 aliphatic hydroxyl group and 0.30 phenolic hydroxyl group per C9-unit; lignins were mainly guaiacyl-type lignin, and -O-4 structures constituted the main intermonomeric connections. Based on the analytical results and proposed reaction mechanism, demethylation, oxidation, and depolymerization were the most important modifications of lignin by brown-rotted fungi.