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Thioacidolytic analysis of residual lignins isolated from the chemical pulps of spruce (Picea abies) and beech (Fagus sylvatica) wood
| Content Provider | Semantic Scholar |
|---|---|
| Author | Choi, Joon Weon Faix, Oskar |
| Copyright Year | 2009 |
| 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. |
| Starting Page | 242 |
| Ending Page | 249 |
| Page Count | 8 |
| File Format | PDF HTM / HTML |
| DOI | 10.1007/s10086-009-1087-4 |
| Alternate Webpage(s) | https://jwoodscience.springeropen.com/track/pdf/10.1007/s10086-009-1087-4 |
| Alternate Webpage(s) | https://doi.org/10.1007/s10086-009-1087-4 |
| Volume Number | 56 |
| Journal | Journal of Wood Science |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
