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Table 4 The release of pCA during pretreatment, the recovery of the solid residue and the content of each component in solid residues

From: Alkaline organosolv pretreatment of different sorghum stem parts for enhancing the total reducing sugar yields and p-coumaric acid release

Materials Solid recovery (%) Released pCA (%) Composition
Glucan (%) Xylan (%) Arabinan (%) Lignin (%)
NaOH–ethanol
 Pith 59.48 ± 0.54 94.07 ± 1.34 56.15 ± 0.72 23.90 ± 0.27 2.95 ± 0.14 5.40 ± 0.16
 Rind 75.85 ± 0.71 97.24 ± 2.11 50.82 ± 0.17 20.21 ± 0.93 2.45 ± 0.07 10.81 ± 0.09
 Whole stem 68.52 ± 0.59 95.05 ± 1.57 51.98 ± 1.04 21.96 ± 0.12 2.73 ± 0.20 6.32 ± 0.21
NaOH
 Pith 55.74 ± 1.16 86.97 ± 0.79 54.10 ± 0.35 17.26 ± 1.12 2.64 ± 0.23 7.49 ± 1.06
 Rind 73.42 ± 0.78 89.72 ± 1.96 48.63 ± 1.86 18.14 ± 0.89 2.12 ± 0.11 13.39 ± 0.95
 Whole stem 64.34 ± 0.94 87.69 ± 1.63 51.60 ± 1.03 17.21 ± 0.67 2.34 ± 0.18 9.67 ± 0.64
  1. NaOH–ethanol pretreatment was performed under the following conditions: 1.63% NaOH, 70% ethanol, 66 °C, 3.18 h; 1.90% NaOH, 70% ethanol, 69.8 °C, 1.00 h and 1.46% NaOH, 70% ethanol, 70 °C, 2.19 h for the pith, rind and whole stem, respectively. NaOH pretreatment was performed under the same conditions, except that 70% ethanol was not included