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Total yields of extraction as a percentage of wood and of total hemicelluloses and lignin obtained from birch, following (a,b) extraction 1 and (c,d) extractions 2 and 3 (Figure 2). Hemicelluloses accounted for 28% based on literature,38 and lignin was determined gravimetrically as Klason lignin, at 19% of the wood biomass. The error bars are the standard deviation.
