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Table 4 Semiquantitative 2D-HSQC NMR spectra analysis of structural characteristics of lignin

From: Elucidation of ligninolysis mechanism of a newly isolated white-rot basidiomycete Trametes hirsuta X-13

  Control 7 days 13 days
Lignin interunit linkagesa (%)
 β-Aryl ether 80.2 87.2 96.0
 Phenylcoumaran 1.2 1.3 1.7
 Resinol 7.3 3.5 0.7
 Cinnamyl alcohol 11.3 8.0 1.6
 Total 100 100 100
 Condensation degree (β–β/β-O-4) 0.091 0.040 0.007
Lignin aromatic unitsb
 H (%) 20.1 (124.6) 11.8 (10.1) 11.9 (6.2)
 G (%) 55.1 (340.7) 65.4 (56.2) 53.2 (27.8)
 S (%) 24.8 (153.3) 22.7 (19.5) 35.0 (18.3)
 Total 100 (618.6) 100 (85.8) 100 (52.3)
 S/G ratio 0.45 0.35 0.66
p-Hydroxycinnamatesc
 p-Coumarate (%) 31.1 23.4 18.6
 Ferulates (%) 24.8 15.2 12.4
  1. aRelative distribution of lignin interunit linkages
  2. bRelative distribution of lignin aromatic units (H + G + S = 100)
  3. cp-Coumarate and ferulate molar content as percentages of lignin content (H + G + S)