Bromination of different morphological parts of spruce wood (Picea abies) |
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| Authors: | Ulla Westermark |
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| Institution: | (1) Research Laboratory, Swedish Forest Products, P. O. Box 5604, S-114 56 Stockholm |
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| Abstract: | Summary It has been found that the lignin in a middle lamella fraction isolated by a sieving technique has the same reactivity to bromine as the whole wood lignin. A plataue value of 1 mole bromine/mole C9-unit was obtained for both samples. The lignin in compression wood had a considerably lower reactivity to bromine than the normal wood lignin. A plataue value of 0.68 mole bromine/mol C9-unit was obtained with such lignin. The discrepancy between this and earlier results from the bromination of middle lamella and the implication of the results for lignin determination by the SEM- and TEM-EDXA technique are discussed. |
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