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Official Journal of the Japan Wood Research Society

Journal of Wood Science Cover Image

Table 2 Yields of thioacidolysis monomers and lignin monomers [syringaldehyde (Sa) and vanillin (Va)] in the residual and solubilized fractions after pretreatment

From: Effect of thermochemical pretreatment on lignin alteration and cell wall microstructural degradation in Eucalyptus globulus: comparison of acid, alkali, and water pretreatments

Pretreatment Residue Solubilized fraction into supernatant water
Weight (mg) Thioacidolysis monomers Weighta (mg) Lignin monomers Thioacidolysis monomers Yieldsb of monomers in the supernatant (%)
(μmol) (μmol) (μmol)
S G S + G S:G Sa Va Sa + Va Sa:Va S G S + G S:G
Untreated   6.42 1.83 8.25 78:22           
1.0 % H2SO4 6.1 0.22 0.12 0.34 65:35 3.9 0.09 0.02 0.11 83:17 0.02 nd 0.02 100:0 1.7
Hot water 4.5 0.07 0.02 0.10 75:25 5.6 0.32 0.06 0.38 85:15 0.16 0.06 0.24 72:28 7.2
0.5 % NaOH 3.6 tr tr tr 6.4 1.23 0.28 1.51 81:19 0.01 tr 0.02 90:10 18.5
  1. Yields of thioacidolysis monomers and Sa and Va are expressed as μmol per residual or solubilized wood (per each weight)
  2. tr trace, nd not detected
  3. aWeight of solubilized fraction was calculated from subtracting the weight of residual wood from the initial weight (i.e., 10 mg)
  4. bThe yield of the sum of (Sa + Va) + (S + G) in the solubilized fraction and its percentage against the amounts of the thioacidolysis monomers recovered from the untreated wood (8.25 μmol)