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Schematic depiction of the extraction sequence of Norway spruce bark; AEB—acetone extracted bark, SWB—subcritical water extracted bark, SWE—subcritical water extracts, MBL—milled bark lignin, OSE—organosolv extract, OSR—organosolv residue, MRL—milled residue lignin, OSL—organosolv lignin, PRF—polysaccharide-rich fraction. The percentage represents the yield of the fraction in wt %.
