Figure 4.

Monomer yields from lignin extracted from beechwood using three different approaches. Monomer yields obtained after hydrogenolysis (optimal conditions, see Supporting Information) of extractives-free beechwood sawdust and lignin extracted by three different methods (Klason, FA, boron) are shown.^12,32 (A) Monomer yield based on extracted lignin. The maximum yield of cleavable monomers from biomass is 52%. Thus, 52% = 100%. (B) Monomer yield based on hydrogenated oil (beechwood). Yields shown are the average of three samples; student’s t-test was used for statistical comparison (*p < 0.05, **p < 0.01, ***p < 0.005).