Welcome to Chemistry and Industry of Forest Products,

›› 2009, Vol. 29 ›› Issue (1): 29-32.

• 研究报告 • Previous Articles     Next Articles

Degradation of Milled-wood Lignin and Its Condensation with Xylose during Kraft Cooking

SHAO Zhen-yu1, XIE Yi-min1, ZHOU Yan2, YANG Zhi-yong2   

  1. 1. Key Lab of Paper Science and Technology of Ministry of Education, Shandong Institute of Light Industry, Ji'nan 250353, China;2. Weifang Science and Technology Vocational College, Shouguang 262700, China
  • Received:2008-01-10 Revised:1900-01-01 Online:2009-02-28 Published:2009-02-28

Abstract: Degradation and condensation of milled-wood lignin(MWL) from Jacaranda copaia Aubl.D.Don during kraft cooking in the presence of xylose was investigated. FT-IR and 13CNMRwere used to analyze the structure of the products from kraft cooking. The results indicated that lignin linkages were cleaved easily by kraft cooking, especially α-aryl ether linkages and β-O-4 linkages. New lignin-carbohydrate complexes(LCC) structures were found simultaneously during the breaking of lignin linkages. The newly formed LCC was originated from condensation between lignin intermediates and xylose,mainly from β-O-4 and 5-5' lignin structures, which were connected with xylose through benzyl ether linkage. In addition, this newly formed LCC was very stable against alkali.

Key words: lignin-carbohydrate complexes, milled-wood lignin, xylose, kraft cooking, benzyl ether linkage

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