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Table 2 XPS analysis of poplar after pretreated with 40%–100% HPAA (v/v) at 60 °C for 2 h

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

Pretreatment label O/C C1 (%) C2 (%) C3 (%)
Raw 0.39 ± 0.0 56.3 ± 0.1 31.3 ± 0.5 12.4 ± 0.4
HPAA40 0.38 ± 0.0 55.1 ± 0.2 33.4 ± 0.1 11.5 ± 0.3
HPAA60 0.40 ± 0.0 52.3 ± 0.7 34.7 ± 0.5 13.0 ± 0.1
HPAA80 0.45 ± 0.0 46.7 ± 0.0 37.6 ± 0.7 15.7 ± 0.7
HPAA100 0.43 ± 0.0 47.3 ± 0.6 37.0 ± 1.1 15.7 ± 0.5
  1. C1 corresponds to class of carbon that corresponds to carbon atoms bonded to carbon or hydrogen (C–C or C-H)
  2. C2 corresponds to class of carbon atoms bonded to single non-carbonyl oxygen(C–O)
  3. C3 corresponds to class of carbon atoms bonded to a carbonyl or two non-carbonyls (C=O or O–C–O)