Table 2 Relative abundances of organic species identified by GC–MS in the HTLWW samples based on peak areas

Acetic acid

5.90

4.21

4.18

2.93

3.62

3.82

2.42

4.98

4.12

3-Pentanol

–^a

0.71

0.80

0.93

0.70

0.50

0.49

1.08

0.96

3-Methoxy-2-butanol

–

0.22

0.79

–

–

–

–

–

–

6-Methoxy-2-hexanol

–

0.35

0.74

–

–

–

–

–

–

Alcohols

–

1.28

2.32

0.93

0.70

0.50

0.49

1.08

0.96

2-Methylfuran

12.78

40.78

30.64

5.40

5.33

4.91

0.98

1.24

2.39

5-Methylfurfural

10.35

2.15

1.87

3.18

1.10

0.21

3.36

3.06

2.82

Furfural

23.13

42.93

32.51

10.46

7.19

2.57

57.04

47.86

33.33

2-Acetyl-5-methylfuran

–

–

–

1.53

1.10

1.27

1.01

0.94

1.05

5-Hydroxymethyl-2-furfural

–

–

5.31

4.40

–

–

7.73

5.68

6.60

Furans

46.25

85.87

70.33

24.98

14.71

8.95

70.12

58.79

46.19

Propanolone

–

2.56

5.89

4.63

0.99

0.54

5.26

4.49

5.47

Butanone

–

–

–

0.87

0.20

0.10

0.57

0.47

0.37

3-Hydroxy-2-butanone

–

2.18

2.08

1.74

1.71

1.40

4.92

3.65

5.92

2-Methyl cyclopentenone

–

–

–

7.39

12.19

6.45

1.83

1.66

2.63

3-Methyl cyclopentenone

–

–

–

2.07

3.65

7.64

–

–

0.99

2,3-Dimethyl cyclopentenone

–

–

–

1.54

4.51

4.27

–

0.49

0.53

2-Hydroxy-3-methyl cyclopentenone

–

–

2.32

4.05

4.00

1.05

1.68

1.88

3.35

2-Hydroxy-3-ethyl cyclopentenone

–

–

0.70

3.31

2.76

2.10

0.79

1.50

2.26

3-Ethyl cyclopentenone

–

–

–

1.35

1.58

3.15

–

0.62

0.75

2,3-Pentanedione

–

–

–

1.44

1.04

–

0.51

0.62

0.30

2,5-Hexanedione

–

–

2.79

5.55

4.94

2.97

2.13

2.04

3.36

3-Ethyl cycloheptanone

–

–

–

1.80

0.90

2.21

–

–

0.73

3-Octanone

–

–

–

1.33

0.98

1.03

0.88

0.77

1.07

1-Cyclopentyl-ethanone

–

–

–

1.29

1.13

1.00

0.53

0.67

0.88

1-(4-Hydroxy–3-methoxy-) acetophenone

–

–

–

0.92

0.57

0.75

–

1.01

0.84

1-(4-Hydroxy–3,5-dimethoxy-) acetophenone

–

–

–

2.68

2.70

2.13

1.16

1.91

1.55

1-(4-Hydroxy–3-methoxy-) propiophenone

–

–

–

1.27

0.83

1.16

–

0.82

1.29

4-Isopropyl- cyclohexenone

–

–

–

2.08

1.82

1.31

–

0.24

0.65

6-Methoxy-3-isopropyl-cyclohexanone

–

–

–

1.19

1.03

2.28

–

–

0.25

Ketones

–

4.74

13.79

46.48

47.54

41.57

15.76

29.35

33.18

Phenol

0.00

0.00

1.02

3.71

4.53

9.49

0.87

1.35

2.17

2-Methoxy-phenol

20.58

1.68

3.73

8.37

12.26

13.12

2.26

3.98

5.75

4-Ethyl-phenol

0.00

0.00

0.89

2.66

2.71

5.90

0.50

0.90

1.60

4-Ethyl-3-methoxy-phenol

15.84

1.29

1.59

3.08

3.16

3.20

1.19

2.77

2.71

2,6-Dimethoxy-phenol

11.44

0.93

2.15

5.87

9.87

12.60

1.34

2.48

3.26

2,4-Ditertiary butyl-phenol

0.00

0.00

0.00

0.98

0.89

0.87

0.55

0.84

0.06

Phenols

47.85

3.90

9.39

24.68

33.42

45.17

6.72

12.31

15.55