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Table 1 Quantitative information (expressed as %) for lignin subunits, hydroxycinnamates, and inter-linkages in DSA, THF-washed DSA switchgrass, and lignin recovered from wash liquid of THF-washed DSA switchgrass

From: THF co-solvent pretreatment prevents lignin redeposition from interfering with enzymes yielding prolonged cellulase activity

  DSA switchgrass THF-washed DSA switchgrass Lignin recovered from wash liquid of THF-washed DSA switchgrass
Lignin subunits
 S 27.9 40.2 30.7
 G 52.5 50.6 48.3
 H 19.6 9.2 21.0
 S/G ratio 0.53 0.79 0.64
Hydroxycinnamates
 FA 16.8 33.7 10.6
 pCA 16.8 59.0 11.4
Interunit linkages
 β-O-4 18.4 40.2 9.7
 β-5 6.1 8.0 4.8
 β–β 0.6 1.2 0.5
  1. Compositions are expressed as a fraction of S + G + H
  2. S: syringyl unit, G: guaiacyl unit, H: p-hydroxyphenyl unit, FA: ferulate, pCA: p-coumarate, β-O-4: β-aryl ether, β-5: phenylcoumaran, β–β: resinol