lignin isolation (6–7% to 9–14%), indicative of less condensed lignin
than in black lignin. For silver grass this advantage is less notorious
– Fig. 5. The ratio S/G of giant reed in black liquor and isolated lignin
(>1) – Table 2 is consistent with the observation already made for
biomass lignin (in situ). For giant reed and silver grass, isolated
lignins contain lower proportion of H units and lower S/G ratio,
respectively, than in black liquor. Minor changes on H:G:S ratio
were triggered by the isolation for hardwood lignins.