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Table 4 Ether- and Ester-linked p-coumaric and ferulic acid content in native and steam exploded biomasses

From: Understanding the structural and chemical changes of plant biomass following steam explosion pretreatment

Substrate Pretreatment severity (CSF) p-coumaric acid (mg/g lignin) Ferulic acid (mg/g hemicellulose)
Ester-linkeda Ether-linkedb Totalc Ester-linkeda Ether-linkedb Totalc
Miscanthus × giganteus Untreated 3.61 ± 0.11 1.20 ± 0.11 4.81 ± 0.08 1.20 ± 0.04 0.82 ± 0.04 2.02 ± 0.03
2.0 3.18 ± 0.02 0.33 ± 0.05 3.50 ± 0.05 0.21 ± 0.01 0.14 ± 0.01 0.35 ± 0.01
2.6 2.84 ± 0.08 0.34 ± 0.08 3.18 ± 0.04 0.04 ± 0.00 0.06 ± 0.00 0.10 ± 0.01
2.7 2.63 ± 0.04 0.39 ± 0.12 3.03 ± 0.08 0.05 ± 0.00 0.05 ± 0.00 0.10 ± 0.01
2.8 2.66 ± 0.06 0.30 ± 0.07 2.96 ± 0.04 0.05 ± 0.00 0.04 ± 0.00 0.09 ± 0.01
Wheat straw Untreated 0.82 ± 0.01 0.33 ± 0.01 1.15 ± 0.01 1.22 ± 0.01 0.67 ± 0.01 1.89 ± 0.02
2.0 0.97 ± 0.01 0.20 ± 0.03 1.18 ± 0.01 0.35 ± 0.03 0.26 ± 0.04 0.60 ± 0.01
2.6 0.97 ± 0.03 0.24 ± 0.02 1.21 ± 0.01 0.09 ± 0.01 0.16 ± 0.01 0.26 ± 0.03
2.7 0.96 ± 0.01 0.22 ± 0.01 1.17 ± 0.01 0.08 ± 0.01 0.14 ± 0.01 0.23 ± 0.01
2.8 0.95 ± 0.02 0.18 ± 0.02 1.14 ± 0.01 0.08 ± 0.01 0.11 ± 0.01 0.19 ± 0.04
  1. All the values are expressed as mean ± SD of triplicate
  2. aRepresents the ester-linked fraction released during 2 M NaOH hydrolysis at 35 °C for 2 h
  3. bRepresents the difference between the ester-linked fraction and the total fraction released during NaOH hydrolysis
  4. cRepresents the ester- and the ether-linked fraction released during 4 M NaOH hydrolysis at 170 °C for 2 h