The yield ofNOproducts (p-hydroxybenzaldehyde – Hy, vanillin
– V, syringaldehyde, – Sy, vanillic acid – VA, syringic acid – SA) are
reported on lignin basis, as depicted in Fig. 5. For biomass, the NO
results are reported on total lignin (data from Table 1), while for
black liquor and isolated material the values are reported on material
free of ashes and carbohydrates. Therefore, the results refer to
lignin and allow a direct comparison and evaluation of processing
impact (pulping and isolation from pulping liquors). Complementary
to Fig. 5, Table 2 present the ratio H:G:S in molar fraction for
each material.