CRCU

Chemical Research in Chinese Universities ›› 2010, Vol. 26 ›› Issue (3): 488-490.

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Quantitative 31P NMR Analysis of Lignocellulosic Materials in Ionic Liquids

SUN Hui1*, XU Ying-kai2* and XU Guo-zhi1   

  1. 1. Department of Materials Science and Engineering, National Center for Quality Supervision and Test of Plastic Products, Beijing Technology and Business University, Beijing 100048, P. R. China;
    2. Department of Surgery, University of Pittsburgh, Pennsylvania 15213, USA
  • Received:2009-10-21 Revised:2010-01-18 Online:2010-05-25 Published:2010-07-27
  • Contact: SUN Hui. E-mail: sunhui@th.btbu.edu.cn; XU Ying-kai. E-mail: xuyingkai@yahoo.com
  • Supported by:

    Supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education, China and the Scientific and Technological Development Programs of of Beijing Municipal Education Commission (No.KM201010011004).

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Abstract:

In an effort to utilize NMR technique for the analysis of the structural components of wood and biomasses such as lignin, we made a comparative study of lignin contents of several types of lignocellulosic materials both before and after enzymatic hydrolyses. To this end, Eucalyptus Globulus, Norway spruce thermomechanical pulp(TMP) corn stover and Eucalyptus kraft pulp were ball-milled and treated with cellulase to prepare materials with high lignin contents. These materials were analyzed via 31P NMR in ionic liquids. The results show that the contents of various functional groups for the lignocellulosic materials after enzymatic hydrolyses are generally in agreement with those from their corresponding enzymatic mild acidolysis liginins(EMALs), indicating that 31P NMR analysis of lignocellulosic materials in ionic liquids is a promising method for quantitative characterization of lignocellulosic materials.

Key words: Structural characterization; 31P NMR; Enzymatic mild acidolysis lignin(EMAL)