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Table 1 Composition of CWR and percentage of solubilized or lost macromolecular fractions after the HWP

From: Evaluating polymer interplay after hot water pretreatment to investigate maize stem internode recalcitrance

 

Raw maize stem

20-min HWP

40-min HWP

M7

M9

M7

M9

M7

M9

Pretreatment severity

–

–

3.66

3.66

3.96

3.96

Yield of HWP (g g−1 CWR)

-

–

0.797 (± 0.022)

0.796 (± 0.034)

0.629 (± 0.027)

0.636 (± 0.033)

Hydrolysate pH

–

–

4.4 (± 0.06)

4.4 (± 0.08)

3.8 (± 0.01)

3.8 (± 0.06)

Composition

 Polysaccharides (g 100 g−1 CWR)

60.2 (± 0.7)

67.3 (± 1.5)

65.7 (± 1.9)

62.1 (± 4.4)

65.1 (± 2.6)

64.0 (± 0.3)

 Cellulose (g.100 g−1 of sugars)

67.7 (± 0.1)

62.1 (± 0.4)

58.4 (± 0.1)

62.4 (± 0.3)

76.7 (± 0.3)

69.2 (± 0.8)

 Hemicelluloses (g.100 g−1 of sugars)

32.3 (± 0.1)

37.9 (± 0.4)

41.6 (± 0.1)

37.6 (± 0.3)

23.3 (± 0.3)

30.8 (± 0.8)

 Klason lignin (g.100 g−1 CWR)

16.3 (± 0.1)

18.6 (± 0.4)

18.7 (± 0.2)

20.1 (± 0.3)

25.3 (± 1.3)

27.3 (± 0.2)

Loss/solubilization after HWPa

 Cellulose (%)

–

–

25.3 (± 1.5)

23.9 (± 5.3)

23.1 (± 1.0)

30.6 (± 0.8)

 Hemicelluloses (%)

–

–

13.4 (± 3.2)

19.6 (± 4.2)

50.5 (± 3.4)

45.7 (± 1.1)

 Klason lignin (%)

–

–

8.7 (± 1.0)

11.8 (± 1.1)

3 (± 0.4)

6.6 (± 0.7)

  1. Results are expressed as means of three repetitions with standard deviation in brackets
  2. a Loss/solubilization after HWP (%) = 100 × [1 − MY × (Yf/Yi)], where MY is the mass yield of the HWP, Yf is the final content and Yi is the initial content (raw CWR)