We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Studies on a Lignin-Carbohydrate Complex.
- Authors
Merewether, J. W. T.; Samsuzzaman, Lohani A. M.; Calder, I. C.
- Abstract
The carbazole reaction was found suitable for the estimation of uronic acids present in the lignin-carbohydrate complex and the amount was found to be 25.5 ± 3%. It was shown that the lignin-carbohydrate complex contained 0.6 aliphatic and 0.9 phenolic hydroxyl groups per C9 unit. The relatively high number of phenolic hydroxyl groups is suggested to be due to the alkaline hydrolysis of active cyclic or linear aryl ether bonds during the isolation of the complex. The lignin fraction of the complex was shown to contain about 0.1 free carboxylic groups per C9 unit. The lignin-carbohydrate complex and its hydrolysed product and their various derivatives were studied by infra-red and nuclear magnetic resonance spectroscopies. The infra-red absorption band near 1438 cm-1 was assigned to carboxylic groups in the complex and its hydrolysed product. Nuclear magnetic resonance spectroscopy suggested that the carbohydrate is attached to the lignin propane side chain possibly at the -position to the guaiacyl or syringyl unit.
- Publication
Holzforschung: International Journal of the Biology, Chemistry, Physics, & Technology of Wood, 1972, Vol 26, Issue 5, p180
- ISSN
0018-3830
- Publication type
Article