Summary
The lignin distribution between the middle lamella and the cell wall of spruce fibers has been determined by a new technique based on a mercurization of the lignin and a concomitant determination of mercury by the SEM-EDXA technique. The ratio of lignin in the middle lamella at the cell corners to the lignin in the secondary wall was 2.5±0.6 for latewood and 2.4±0.6 for earlywood. This gives a lignin content of 55–58% in the true middle lamella in the cell corners. The reactivity to mercuric acetate of different wood elements was determined in separate experiments. Fractions enriched in ray cells, middle lamella, and compression wood all reacted at the same rate as the whole wood; about one mole of mercury was incorporated per mole of lignin (C9-unit).
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Westermark, U., Lidbrandt, O. & Eriksson, I. Lignin distribution in spruce (Picea abies) determined by mercurization with SEM-EDXA technique. Wood Sci.Technol. 22, 243–250 (1988). https://doi.org/10.1007/BF00386019
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DOI: https://doi.org/10.1007/BF00386019