Table 2 Pyrolysis product analysis of lignin derived from enzymatic hydrolysis residue at 60 ℃

1

Acetic acid

1.75 ± 0.16

2.12 ± 0.49

2^H

Toluene

0.02 ± 0.03

0.28 ± 0.14

3

Furfural

0.15 ± 0.04

0.42 ± 0.08

4^H

Phenol

0.98 ± 0.06

1.44 ± 0.17

5^H

2-Methylphenol

0.37 ± 0.03

0.42 ± 0.01

6^H

4-Methylphenol

1.71 ± 0.03

1.45 ± 0.27

7^G

Guaiacol

1.48 ± 0.16

1.96 ± 0.47

8^H

2,6-Dimethylphenol

0.13 ± 0.04

0.18 ± 0.06

9^H

2,4-Dimethylphenol

0.53 ± 0.12

0.54 ± 0.14

10^H

4-Ethylphenol

1.82 ± 0.24

1.49 ± 0.22

11^G

2-Methoxy-6-methylphenol

0.46 ± 0.13

0.38 ± 0.01

12^G

2-Methoxy-4-methylphenol,

2.11 ± 0.11

2.05 ± 0.05

13

Catechol

1.13 ± 0.07

1.49 ± 0.10

14^H

2,3-Dihydrobenzofuran

9.28 ± 0.72

6.23 ± 0.48

15^H

1-Ethyl-4-methoxybenzene

0.46 ± 0.12

0.34 ± 0.17

16^H

4-(2-Propenyl)phenol

0.24 ± 0.11

0.17 ± 0.04

17^H

4-Propylphenol

0.41 ± 0.02

0.21 ± 0.02

18^G

3-Methoxy-2-benzenediol

2.87 ± 0.23

3.86 ± 0.06

19^G

4-Ethylguaiacol

1.23 ± 0.08

1.17 ± 0.16

20^H

2-Allylphenol

0.20 ± 0.07

0.21 ± 0.05

21

4-Methylcatechol

1.24 ± 0.33

0.93 ± 0.00

22^H

4-(2-Propenyl)phenol

0.49 ± 0.31

0.18 ± 0.03

23^G

2-Methoxy-4-vinylphenol

2.27 ± 0.26

2.3 ± 0.38

24^G

3-Methoxy-5-methylphenol

0.48 ± 0.21

0.57 ± 0.21

25^H

4-(2-Propenyl)phenol,

1.16 ± 0.21

0.79 ± 0.17

26^S

Syringol

4.04 ± 0.15

4.48 ± 0.61

27^G

Eugenol

0.58 ± 0.01

0.36 ± 0.02

28^S

3,4-Dimethoxyphenol

1.73 ± 0.03

1.11 ± 0.17

29^H

4-Hydroxybenzaldehyde

0.94 ± 0.07

0.36 ± 0.11

30^S

2,6-Dimethoxytoluene

0.52 ± 0.22

ND

31^G

Vanillin

1.33 ± 0.15

1.08 ± 0.08

32^G

(e)-Isoeugenol

0.73 ± 0.04

0.54 ± 0.05

33^G

Vanillic acid

6.60 ± 0.11

5.4 ± 0.41

34^G

Homovanillyl alcohol

0.31 ± 0.03

ND

35^G

4′-Hydroxy-3′-methoxyacetophenone

0.90 ± 0.12

1.16 ± 0.06

36^G

Methyl vanillate

0.27 ± 0.02

0.43 ± 0.05

37^S

1,2,3-Trimethoxy-5-methylbenzene

1.09 ± 0.05

0.98 ± 0.26

38^G

(4-Hydroxy-3-methoxyphenyl)acetone

0.57 ± 0.13

0.54 ± 0.03

39^S

3′,5′-Dimethoxyacetophenone

2.28 ± 0.18

1.96 ± 0.42

40^G

Isovanillic acid

0.22 ± 0.04

0.41 ± 0.10

41^G

4′-Hydroxy-3′-methoxyacetophenone

ND

0.44 ± 0.01

42^S

4-Hydroxy-3,5-dimethoxyallylbenzene

1.15 ± 0.02

0.98 ± 0.07

43^S

4-Hydroxy-3,5-dimethoxyallylbenzene

1.45 ± 0.16

1.25 ± 0.23

44^S

Syringaldehyde

3.52 ± 0.25

1.91 ± 0.07

45^G

Coniferyl alcohol

0.46 ± 0.05

0.33 ± 0.07

46^S

4-Hydroxy-3,5-dimethoxyallylbenzene

3.81 ± 0.30

2.94 ± 0.28

47^S

Acetosyringone

3.11 ± 0.68

2.56 ± 0.16

48^H

4-Hydroxycinnamic acid methyl ester

0.74 ± 0.14

0.45 ± 0.29

49^S

3,5-Dimethoxy-4-hydroxyphenylacetic acid

2.05 ± 0.35

1.73 ± 0.09

50^S

Acetosyringone

0.92 ± 0.15

1.31 ± 0.01

51^S

(E)-3,5-Dimethoxy-4-hydroxycinnamaldehyde

0.78 ± 0.37

ND

Total peak areas of S

26.44 ± 1.64

21.22 ± 1.74

Total peak areas of G

22.89 ± 0.33

23.01 ± 1.57

Total peak areas of H

19.49 ± 0.21

14.71 ± 0.47