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Paper Information

Journal:   JOURNAL OF AGRICULTURAL SCIENCES   Winter 2004 , Volume 9 , Number 4; Page(s) 71 To 82.
 
Paper: 

INVESTIGATING POPLAR (POPOLUS NIGRA) LIGNIN 1-USING H NMR SPECTROSCOPY AND CHEMICAL METHODS

 
 
Author(s):  SADEGHIFAR HASAN, MIRSHOKRAEI S.A.
 
* 
 
Abstract: 

Lignin of poplar wood was investigated using chemical methods and nuclear magnetic resonance (1H NMR) spectroscopy. Klason lignin and acid soluble lignin of this species was determined to be 19% and 3.1% respectively. Carbon, oxygen and hydrogen of purified lignin sample was found to be 63.1%, 31.6% and 5.3%. Methoxyl groups and phenolic and aliphatic hydroxyl groups of lignin was found to be 1.29, 0.45 and 0.92 respectively using 1H NMR spectroscopy. By chemical methods of analysis, these data was found to be 1.25 for methoxyl groups and 1.32 for hydroxyl groups for each phenyl propane unit. The degree of substitution of aromatic hydrogens by C-C and R-5 linkages was determined to be 25%. Therefore, using 1H NMR spectroscopy, the structure of lignin was determined as following:
C9Ha1 3.o8Hph 2.02O 1.21 (OH) ph 0.45 (OH) al 0.92 (OCH3) 1.29

 
Keyword(s): POPLAR LIGNIN, H NMR SPECTROSCOPY, POPLAR, CHEMICAL METHODS
 
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