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Journal of Wood Science

Official Journal of the Japan Wood Research Society

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Thioacidolytic analysis of residual lignins isolated from the chemical pulps of spruce (Picea abies) and beech (Fagus sylvatica) wood

Journal of Wood Science volume 56, pages 242–249 (2010)Cite this article

Abstract

Eight different residual lignins isolated from unbleached chemical pulps [sulfite, kraft, alkaline sulfite-anthraquinone-methanol (ASAM), soda/AQ/MeOH] of spruce and beech were characterized using gel permeation chromatography (GPC), thioacidolysis, and desulfurization to determine average molecular weight, amounts of uncondensed β-O-4 linkages, and dimeric linkage patterns, respectively. The total amounts of G-CHSEt-CHSEt-CH2SEt and S-CHSEt-CHSEt-CH2SEt were markedly reduced in residual lignins to 40% to 80% of the values for the corresponding milled wood lignins (MWLs). The number of dimeric units determined by thioacidolysis and desulfurization of the residual lignins was decreased by onehalf to one-fifth compared to the MWLs. Among the diverse types of dimeric units, reduction of β-1 and β-5 units was significant in most of the residual lignins, with the exception of beech ASAM residual lignin. Compared to beech MWL, 40% more C6–C3 main monomers were detected, whereas the relative composition of the dimeric units in the beech residual lignin was very similar to that in the beech MWL. The average molecular weights of residual lignins were less than those of the MWLs. However, the average molecular weights of the spruce kraft and soda residual lignins were determined to be higher than those of the corresponding MWLs.

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Authors and Affiliations

  1. Department of Forest Sciences and Research Institute for Agriculture and Life Science, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul, 151-921, Republic of Korea

    Joon Weon Choi

  2. Institute of Wood Chemistry and Chemical Technology of Wood, Federal Research Center for Forestry and Forest Products (BFH), Hamburg, 21031, Germany

    Oskar Faix

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  1. Joon Weon Choi
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  2. Oskar Faix
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Correspondence to Joon Weon Choi.

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Choi, J.W., Faix, O. Thioacidolytic analysis of residual lignins isolated from the chemical pulps of spruce (Picea abies) and beech (Fagus sylvatica) wood. J Wood Sci 56, 242–249 (2010). https://doi.org/10.1007/s10086-009-1087-4

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  • DOI: https://doi.org/10.1007/s10086-009-1087-4

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