Silver grass was the material with
lower NO yield. However, higher yields on lignin isolation would
balance the final yields on vanillin and syringaldehyde per kg of
biomass. For vanillin production this is the preferred biomass due to
the lowest S/G ratio. Frequency of free phenolic groups, as depicted
in Table 6, is also a requisite for some lignin applications and it
is related with lignin reactivity. Willow lignin contains the higher
frequency of terminal moieties; this characteristic, associated with
higher frequency of C C linkages between aromatic rings (condensation
degree) and also between side chains (cyclic structures and
ˇ ˇ) could make this lignin a good candidate for polymers production.
Giant reed presented the lowest pulp yield, as well as a low
lignin yield (comparatively to willow and silver grass).