The Distribution of Phenolic Hydroxyl Groups in Hardwood Lignins
作者:
Yuan-Zong Lai,
Masamitsu Funaoka,
期刊:
Journal of Wood Chemistry and Technology
(Taylor Available online 1993)
卷期:
Volume 13,
issue 1
页码: 43-57
ISSN:0277-3813
年代: 1993
DOI:10.1080/02773819308020506
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Periodate oxidation, because of its high selectivity in the degradation of free-phenolic units, has been used along with the combined phenyl nucleus exchange and nitrobenzene oxidation techniques to estimate the distribution of phenolic hydroxyl groups in hardwood lignins. Analyses of the aspen and white birch wood lignin in situ indicate that the percentage of uncon-densed structures having a phenolic hydroxyl group was considerably higher for guaiacyl (∼20%) than for syringyl (−5%) units. Thus, the total phenolic hydroxyl groups of hardwood lignins are largely associated with the guaiacyl propane units.
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