Table 1 Composition of untreated and pretreated poplar samples

Lignin content^a

28.12 ± 0.28

31.83 ± 0.86

27.24 ± 0.14

8.54 ± 0.37

S + G^b

1864.47 ± 81.76

1273.19 ± 186.77

1727.02 ± 212.27

180.36 ± 19.41

S/G

1.5

1.6

1.6

1.1

Total sugars^a

56.53 ± 2.23

59.85 ± 2.64

62.14 ± 2.97

65.85 ± 3.33

Glucose^a

35.95 ± 1.40

44.64 ± 1.86

40.50 ± 1.96

42.32 ± 2.26

Xylose^a

14.79 ± 0.47

12.25 ± 0.61

15.68 ± 0.72

17.80 ± 0.87

Mannose^a

2.61 ± 0.11

1.93 ± 0.12

2.97 ± 0.14

3.10 ± 0.10

Arabinose^a

0.35 ± 0.01

0.07 ± 0.01

0.37 ± 0.01

0.22 ± 0.01

Galactose^a

0.92 ± 0.03

0.25 ± 0.01

0.89 ± 0.03

0.66 ± 0.02

Rhamnose^a

0.38 ± 0.01

0,16 ± 0.01

0,37 ± 0.04

0,37 ± 0.01

Galacturonic acid^a

1.37 ± 0.02

0.50 ± 0.03

1.27 ± 0.07

1.25 ± 0.05

Glucuronic acid^a

0.16 ± 0.08

0.04 ± 0.01

0.09 ± 0.01

0.13 ± 0.01