Skip to main content

Table 3 Relative abundance of lignin-derived pyrolysis products of birch samples at 600 °C

From: Microbial biogas production from hydrolysis lignin: insight into lignin structural changes

Pyrolysis products Peak no. RT (min) Relative abundance (%)a
Untreated birch Steam-exploded birch HL HL after AD
Phenol 1 26.303 1.0 1.4 0.8 2.4
Guaicol 2 27.141 3.8 6.9 6.1 8.8
Phenol,2-methyl 3 27.658 0.6 0.9 0.8 1.3
p-Cresol 4 28.417 3.7 1.6 0.7 1.8
Phenol,4-methoxy-3-methyl- 5 29.285 1.3 0.7 0.8 0.8
Phenol,2-methoxy-4-methyl- 6 30.149 4.2 7.0 9.0 12.8
Phenol,4-ethyl-2-methoxy- 7 32.967 2.7 1.1 1.5 2.1
2-Methoxy-4-vinylphenol 8 35.035 5.2 6.5 6.2 10.9
Eugenol m/z 164 9 36.085 0.3 0.2 0.2 0.7
Phenol,2,6-dimethoxy- 10 37.169 10.9 17.4 15.4 8.0
Phenol,2-methoxy-5-(1-propenyl),(E)- 11 38.418 1.3 1.1 1.6 2.5
trans-Isoeugenol 12 40.67 4.1 3.3 4.3 8.7
1,2,4-Trimethoxybenzene 168 m/z 13 41.218 1.8 3.1 4.0 2.2
Vanillin 152 m/z 14 41.297 1.5 0.8 0.9 1.7
Phenol,2-methoxy-4-propyl- 15 43.989 2.4 1.0 0.0 0.8
5-tert-Butylpyrogallol 16 44.665 1.2 1.2 2.4 0.9
Acetovanillone 17 45.148 2.4 0.9 1.4 3.4
3,5-Dimethoxyacetophenone 18 47.385 11.1 11.6 11.2 9.1
Phenol,2,6-dimethoxy-4-(2-propenyl)-b 19 48.361 4.4 3.8 4.8 3.3
Phenol,2,6-dimethoxy-4-(2-propenyl)-b 20 50.915 1.6 1.2 2.2 1.4
2-(2,5-Dimethoxy-4-ethylphenyl)ethylamine, N-acetyl- 21 52.649 1.4 1.2 1.4 0.9
Phenol,2,6-dimethoxy-4-(2-propenyl)-b 22 53.788 9.2 7.3 9.5 7.1
Syringaldehyde 23 54.833 12.0 9.9 10.3 4.8
Homosyringic acid 24 56.93 5.4 2.7 0.0 0.0
Acetosyringone 25 58.173 4.4 3.7 2.3 2.3
Sinapyl alcohol 26 60.123 1.2 3.1 1.9 1.3
Sinapic aldehyde 27 63.501 0.9 0.4 0.2 0.2
Total    100.0 100.0 100.0 100.0
H (%)    5.5 3.7 4.0 4.0
G (%)    29.3 29.4 31.9 53.1
S (%)    64.3 65.5 63.4 40.5
S/G ratio    2.2 2.2 2.0 0.8
Ph-C1,C2/Ph-C3 ratio    0.7 0.9 0.9 1.2
Oxygenated side chain (%)    40.4 34.4 29.6 23.7
  1. aThe peak areas of the lignin-derived pyrolysis products were normalized to 100%
  2. bPeaks 19, 20 and 22 are all assigned as the same compound by the NIST 11 MS library, and are likely isomers