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Table 4 XPS analysis of HPAA–SH-pretreated poplar

From: Alkaline post-incubation improves the saccharification of poplar after hydrogen peroxide–acetic acid pretreatment

Pretreatment label

O/C

C1 (%)

C2 (%)

C3 (%)

HPAA40–SH0.1

0.39 ± 0.0

54.4 ± 0.3

32.9 ± 0.6

12.7 ± 0.3

HPAA60–SH0.1

0.42 ± 0.0

49.3 ± 0.1

36.0 ± 0.5

14.6 ± 0.4

HPAA80–SH0.1

0.47 ± 0.0

43.8 ± 0.3

41.5 ± 0.0

14.7 ± 0.3

HPAA100–SH0.1

0.46 ± 0.0

45.6 ± 0.0

38.1 ± 0.3

16.3 ± 0.3

HPAA40–SH1.0

0.40 ± 0.0

53.4 ± 0.2

34.9 ± 0.8

11.7 ± 0.6

HPAA60–SH1.0

0.44 ± 0.0

49.4 ± 0.1

37.5 ± 0.2

13.1 ± 0.1

HPAA80–SH1.0

0.50 ± 0.0

43.6 ± 0.1

41.5 ± 0.1

15.0 ± 0.0

HPAA100–SH1.0

0.50 ± 0.0

40.6 ± 0.2

43.0 ± 0.3

16.5 ± 0.0

  1. In HPAA–SH process, HPAA pretreatment conditions were 40%–100% HPAA (v/v) at 60 °C for 2 h and alkaline post-incubation conditions were 0.1% and 1.0% sodium hydroxide at 50 °C for 1 h