Skip to main content

Table 5 Inhibitors produced in liquid fractions during the pretreatment of sorghum pith, rind and whole stem

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

Materials

Ferulic acid (g/L)

Acetic acid (g/L)

Levulinic acid (g/L)

Furfural (g/L)

HMF (g/L)

NaOH–ethanol

 Pith

0.184

1.428

n.d.

n.d.

n.d.

 Rind

0.210

1.448

 Whole stem

0.204

1.490

NaOH

 Pith

0.183

1.462

n.d.

n.d.

n.d.

 Rind

0.194

1.487

 Whole stem

0.186

1.521

  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
  2. n.d. not detected