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Table 2 Composition of the solid and liquid fractions of the STEX + HEX-pretreated materials, HEX treated at 150 °C for 8 h (STEX + HEX-150/8) and at 190 °C for 4 h (STEX + HEX-190/4)

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

  Standard conditions Modified conditions
SFSTEX+HEX150/8 (wt%) LFSTEX+HEX150/8 (g/L) SFSTEX+HEX190/4 (wt%) LFSTEX+HEX190/4 (g/L)
Carbohydrates, thereof 84.1 ± 2.2 na 83.9 ± 4.2 na
 Glucan/glucose 75.0 ± 1.3 0.1 ± 0.0 77.6 ± 2.7 0.2 ± 0.0
 Xylan/xylose 6.0 ± 0.1 0.8 ± 0.0 3.6 ± 0.1 3.2 ± 0.0
 Arabinan/arabinose BDL BDL BDL BDL
 Galactan/galactose BDL 0.1 ± 0.0 BDL 0.2 ± 0.0
 Mannan/mannose 3.0 ± 0.9 0.2 ± 0.0 2.7 ± 1.4 0.4 ± 0.0
Lignin, thereof 13.7 ± 0.6 na 13.5 ± 0.2 na
 Acid-soluble 2.2 ± 0.2 na 1.6 ± 0.1 na
 Acid-insoluble 11.6 ± 0.4 na 11.5 ± 0.0 na
Ash BDL na BDL na
Recovery 97.8 ± 2.2 na 97.4 ± 4.0 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