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Table 5 Quantificational results of the lignin by 2D HSQC spectra (results expressed per 100 aromatic rings)

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

Lignocellulosic biomass Pretreatment severity (CSF) β-O-4′ β-5′ β-β′ S/G ratio
Miscanthus × giganteus Untreated 42.1 9.9 3.8 1.34
2.0 13.3 11.7 2.1 0.79
2.6 8.5 9.1 2.1 0.92
2.7 4.2 9.1 7.0 0.81
2.8 ND ND ND ND
Poplar Untreated 43.1 11.6 6.0 1.29
2.0 31.0 8.0 9.9 2.23
2.6 13.0 7.0 9.8 2.09
2.8 6.8 9.5 12.1 1.95
Wheat straw Untreated 45.3 8.3 5.6 1.12
2.0 20.3 11.3 2.1 0.84
2.6 12.4 10.6 1.9 1.04
2.7 8.1 9.8 5.0 0.96
2.8 9.3 9.2 3.9 0.95
  1. S/G ratio is the ratio S 2,6/G 2
  2. ND contour intensities of the corresponding cross peaks not detected or not allowing an acceptable quantification