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Differences in residual lignin properties between Betula verrucosa and Eucalyptus urograndis kraft pulps
Author(s) -
Hänninen Tuomas A.,
Kontturi Eero,
Isogai Akira,
Vuorinen Tapani
Publication year - 2008
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.21023
Subject(s) - hardwood , lignin , chemistry , kraft process , cellulose , eucalyptus globulus , kraft paper , pulp (tooth) , eucalyptus , crystallinity , botany , pulp and paper industry , organic chemistry , dentistry , biology , medicine , engineering , crystallography
By comparing the ultrastructural features of two oxygen delignified hardwood kraft pulps ( Eucalyptus urograndis and Betula verrucosa ), we have demonstrated a marked difference in their residual lignin properties. In this study, properties such as crystallinity and crystal size of cellulose, molecular weights, carboxyl group contents, and carbohydrate compositions of the two kraft pulps were compared. The examined pulps were in our observations relatively similar. A significant difference, however, was observed in the size exclusion chromatography measurements, which indirectly suggested that a significant portion of residual lignin in eucalyptus pulp was associated with cellulose. Birch pulp, in contrast, exhibited a more conventional tendency for hardwood pulps: lignin mainly associated with hemicelluloses. © 2008 Wiley Periodicals, Inc. Biopolymers 89: 889–893, 2008. This article was originally published online as an accepted preprint. The “Published Online” date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com