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Illustration of each extraction step and the amount of lignin extracted in each; SWB—subcritical water extracted bark, SWE—subcritical water extract, OSE—organosolv extract, OSL—organosolv lignin, OSR—organosolv residue, PRF—polysaccharide-rich fraction. The lignin percentage represents the total amount of lignin in each fraction; KL—Klason lignin, ASL—acid-soluble lignin.
