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Table 2 Semiquantitative 1H-13C HSQC NMR structural characterization of untreated and 7 days P. anserina-treated wheat straw lignin

From: Evidence for ligninolytic activity of the ascomycete fungus Podospora anserina

 Control7 days
Lignin subunits (%)a
 H44
 G6159
 Gox02
 S3534
 Sox02
  S/G0.60.6
Hydroxycinnamates (%)b
 p-Coumarate86
 Ferulate108
Flavonolignin (%)b
 Tricin1415
Lignin interunit linkages (%)b,c
 β-O-4′ Aryl ethers63 (93)59 (92)
 β-5′ Phenylcoumarans4 (5)4 (6)
 β-β’ Resinols1 (2)1 (2)
Total68 (100)64 (100)
  1. Structural features for the combined fractions weighted on the basis of the lignin mass balance
  2. aRelative distribution of lignin subunits (H + G+Gox + S+Sox = 100)
  3. bRelative volume integral of substructure versus volume integral of total lignin subunits
  4. cRelative distribution of total interunit linkages in parentheses