Bauer-McNett fractions of an aspen chemi-thermomechanical pulp showed a significant variation
with respect to lignin content and sugar composition, and two of the fractions were found to be
particularly rich in middle lamella and secondary wall material, respectively. The secondary wall
lignin of aspen was found to contain larger amounts of non-condensed β-O-4 aryl ether structures
than the middle lamella lignin and the difference was attributed to a larger amount of syringyl
structures as revealed by thioacidolysis. Size exclusion chromatography of the thioacidolysis products
from birch and spruce wood showed a larger part of lignin oligomers being present in the degraded
spruce lignin. Moreover, birch lignin had a lower phenolic content than both aspen and
spruce lignin. Thioacidolysis followed by Raney-nickel desulphuration was used for the analysis of
hardwood lignin trimers.
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