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Table 1 Composition of the raw material and solid and liquid fractions after STEX pretreatment

From: Sequential fractionation of the lignocellulosic components in hardwood based on steam explosion and hydrotropic extraction

 

Raw material

HEX-treated material

STEX treated material

SFraw mat (wt%)

SFHEX (wt%)

LFHEX (g/L)

SFSTEX (wt%)

LFSTEX (g/L)

Carbohydrates, thereof

67.6 ± 1.4

83.9 ± 0.1

na

67.1 ± 1.1

na

 Glucan/glucose

39.4 ± 0.7

67.1 ± 0.1

0.4 ± 0.0

59.2 ± 0.7

2.6 ± 0.0

 Xylan/xylose

22.2 ± 0.5

13.2 ± 0.0

10.1 ± 0.1

5.7 ± 0.0

43.4 ± 0.7

 Arabinan/arabinose

0.6 ± 0.0

BDL

0.2 ± 0.0

BDL

0.7 ± 0.0

 Galactan/galactose

1.8 ± 0.1

BDL

0.7 ± 0.0

BDL

2.2 ± 0.0

 Mannan/mannose

3.7 ± 0.2

3.6 ± 0.0

0.5 ± 0.0

1.9 ± 0.0

5.7 ± 0.2

Lignin, thereof

27.2 ± 1.1

14.5 ± 0.1

na

30.4 ± 0.0

na

 Acid-soluble

6.5 ± 0.0

3.4 ± 0.2

na

2.9 ± 0.1

na

 Acid-insoluble

20.7 ± 1.0

11.1 ± 0.1

na

27.5 ± 0.1

na

Ash

BDL

BDL

na

BDL

na

Recovery

94.9 ± 2.5

98.4 ± 0.0

na

97.6 ± 1.1

na

  1. Data represent mean values and standard deviation. Analyses were performed in duplicate
  2. BDL below detection limit, na not applicable, SF solid fraction, LF liquid fraction, STEX steam explosion, HEX hydrotropic extraction