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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