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Table 3 Chemical composition of liquid and solid fraction after steam explosion and cellulose-to-glucose conversion during enzymatic of untreated and preprocessed poplar biomasses

From: Removal of non-structural components from poplar whole-tree chips to enhance hydrolysis and fermentation performance

 

Pretreatment condition

Liquid fraction

Solid fraction

Sugar recovery

Solid yield (%)

Chemical composition

Enzymatic hydrolysis

Combined severity2

pH

Glucose

Xylose

Total sugars1

Glucan (%)

Xylan (%)

Lignin (%)

Ash (%)

Glucose conversion (%)

kg/tonne

Mon3 %

kg/tonne

Mon %

kg/tonne

Mon %

Untreated

1.72

1.78

79.1 ± 0.1

75.4

114.8 ± 1.5

70.8

232.4 ± 1.8

72.9

54.8

59.3 ± 0.8

1.7 ± 0.0

36.9 ± 0.6

1.4 ± 0.1

62.4 ± 0.8

Neutral

1.84

1.66

85.6 ± 0.0

83.0

148.5 ± 0.7

80.3

279.4 ± 1.3

81.5

54.4

58.7 ± 1.1

1.9 ± 0.0

35.0 ± 2.5

0.7 ± 0.0

68.3 ± 0.7

Acidic-neutral

1.88

1.62

66.1 ± 0.2

86.0

135.3 ± 0.5

81.1

235.1 ± 0.3

82.8

58.8

59.8 ± 1.1

2.3 ± 0.0

36.4 ± 0.3

0.3 ± 0.1

74.1 ± 1.0

Acidic

2.08

1.42

88.1 ± 0.1

85.8

118.6 ± 0.8

83.1

241.6 ± 0.9

84.3

53.7

58.1 ± 0.2

0.6 ± 0.0

38.9 ± 0.6

0.4 ± 0.1

76.0 ± 5.2

  1. 1Total sugars represent the combination of glucose, xylose, arabinose, galactose, and mannose as anhydrosugars
  2. 2“Combined severity” (CS) is defined based on reaction temperature (TH °C), time (t, min), reference temperature (TR, 100 °C), and pH (measured from the liquid fraction after pretreatment). CS = logR0 − pH, where R0 = t × [exp (TH − TR)/14.75]
  3. 3“Mon” represents “monomeric”