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Table 1 Pyrolysis products of each sample

From: In situ lignocellulosic unlocking mechanism for carbohydrate hydrolysis in termites: crucial lignin modification

Number RTb, minutes Compound identificationc Content of compound, mg/g  
    Undigested wood Feces Change, %
1I 1.811 1-Propen-2-ol, acetate 10.75 ± 0.51 4.74 ± 0.23 -55.9 ± 2.7
2I 5.319 Furfural 5.47 ± 0.26 2.27 ± 0.11 -58.6 ± 2.8
3I 5.866 2-Furanmethanol 2.01 ± 0.09 1.02 ± 0.04 -49.2 ± 2.1
4I 6.547 2-Cyclopentene-1,4-dione 1.70 ± 0.08 0.60 ± 0.03 -64.5 ± 3.1
5I 7.274 2(5H)-Furanone 2.62 ± 0.12 1.34 ± 0.06 -48.7 ± 2.2
6I 7.533 1,2-Cyclopentanedione 6.58 ± 0.32 2.81 ± 0.13 -57.3 ± 2.8
7I 7.926 Dihydro-3-methylene-2,5-furandione 1.17 ± 0.04 0.43 ± 0.02 -62.6 ± 2.4
8I 8.409 3-Butyldihydro-2(3H)-furanone 2.97 ± 0.10 1.21 ± 0.04 -59.2 ± 2.0
9I 8.780 Resorcinol 1.33 ± 0.06 0.58 ± 0.03 -56.2 ± 2.7
10I 8.940 Phenol 1.04 ± 0.05 1.47 ± 0.07 +42.6 ± 2.0
11I 10.109 3-Methyl-1,2-cyclopentanedione 2.67 ± 0.11 1.16 ± 0.05 -56.6 ± 2.3
12I 10.553 4-Methyl-5H-furan-2-one 2.07 ± 0.09 N/A -
13I 10.739/11.263 3-Methylphenol 9.98 ± 0.47 3.99 ± 0.19 -60.0 ± 2.9
14I 11.567 2-Methoxyphenol 8.65 ± 0.41 8.64 ± 0.41 -0.1 ± 0.0
15I 12.283 Maltol 1.36 ± 0.06 N/A -
16I 13.038 2,5-Dimethylphenol 1.38 ± 0.06 1.33 ± 0.06 -3.7 ± 0.2
17I 13.314 5-heptyldihydro-2(3H)-Furanone 1.79 ± 0.08 N/A -
18I 13.469 2,3-Dihydroxybenzaldehyde 1.22 ± 0.05 N/A -
19I 13.724/14.125 2-Methoxy-4-methylphenol 12.27 ± 0.42 12.51 ± 0.48 +2.0 ± 0.1
20I 14.280 4-Methoxy-2,5-dimethyl-3(2H)-furanone 7.33 ± 0.25 N/A -
21I 14.569 1,2-Benzenediol 7.45 ± 0.35 4.08 ± 0.19 -45.2 ± 2.1
22I 15.027, 19.643, 20.902, 17.140-17.257, 21.101, 21.817, 22.102-22.500 O-D-Glucopyranosyl-D-glucopyranoside 34.14 ± 1.65 13.79 ± 0.67 -59.6 ± 2.9
23I 15.415 5-(Hydroxymethyl)-2-furancarboxaldehyde 8.80 ± 0.33 N/A -
24I 15.898 3-Methyl-1,2-benzenediol 2.33 ± 0.08 1.974 ± 0.06 -15.2 ± 0.5
25I 16.101 4-Ethyl-2-methoxyphenol, 3.28 ± 0.16 3.194 ± 0.15 -2.7 ± 0.1
26I 16.601 4-Methyl-1,2-benzenediol 8.33 ± 0.39 3.337 ± 0.16 -59.9 ± 2.8
27I 16.955 2-Methoxy-4-vinylphenol 11.29 ± 0.46 14.246 ± 0.57 +26.2 ± 1.0
28I 17.563 4-(2-Propenyl)phenol 0.97 ± 0.05 1.383 ± 0.06 +42.4 ± 2.0
29I 17.887 Eugenol 4.85 ± 0.23 5.336 ± 0.25 +10.0 ± 0.5
30I 18.072, 20.156 2-Methoxy-4-propylphenol 5.20 ± 0.25 3.878 ± 0.18 -25.5 ± 1.2
31I 18.935 Vanillin 7.67 ± 0.33 10.594 ± 0.46 +38.2 ± 1.7
32I 19.901 Isoeugenol 12.03 ± 0.44 14.113 ± 0.05 +17.3 ± 0.8
33I 20.730 1-(4-Hydroxy-3-methoxyphenyl)-ethanone 8.38 ± 0.32 6.966 ± 0.62 -16.8 ± 0.8
34I 21.618 1-(4-Hydroxy-3-methoxyphenyl)-2-propanone 1.95 ± 0.04 5.984 ± 0.26 +207.1 ± 0.4
35I 22.447/24.315/25.574 4-((1E)-3-Hydroxy-1-propenyl)-2-methoxyphenol 8.13 ± 0.31 11.385 ± 0.33 +39.9 ± 0.8
36I 22.563 4-Hydroxy-3-methoxy-benzoic acid 2.72 ± 0.09 2.498 ± 0.29 -8.2 ± 0.3
37I 23.905 4-Hydroxy-3-methoxy-benzeneacetic acid 7.43 ± 0.31 7.508 ± 0.44 +1.0 ± 0.0
38I 25.458 4-Hydroxy-2-methoxycinnamaldehyde 1.75 ± 0.08 7.515 ± 0.28 +328.9 ± 2.3
39I 34.297 10,11-Dihydro-10-hydroxy-2,3-dimethoxydibenz 0.58 ± 0.02 0.706 ± 0.30 +22.2 ± 1.0
40I 34.703 Dihydrofisetin 0.81 ± 0.04 0.611 ± 0.29 -24.6 ± 0.0
41I 14.768 2,3-Dihydro-benzofuran N/A 1.150 ± 0.03 -
42I 21.265 Benzoic acid, 4-hydroxy-3-methoxy- methyl ester N/A 1.946 ± 0.09 -
43I 22.671 2,4'-Dihydroxy-3'-methoxyacetophenone N/A 1.330 ± 0.04 -
  1. aIdentified products from thermal degradation of lignin and their absolute amounts (g/g, mean of three replicate analyses) calculated using the correction factor value.
  2. bRetention time.
  3. cSee the structures of the labeled compounds in Figure 5.