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Table 2 Structural characterization in the HSQC spectra of poplar and wheat straw

From: A comprehensive study of the promoting effect of manganese on white rot fungal treatment for enzymatic hydrolysis of woody and grass lignocellulose

Treatment Lignin subunits    Lignin inter-unit linkagesb     Condensation degreec
  S/G S′ + G′ (%)a FA (%)a β-O-4′ β-5′ β-β′ β-1′  
Poplar         
 Raw 2.969 4.5 0.132 0.007 0.012 0.005 0.182
 Pc 2.244 8.0 0.114 0.007 0.006 0.002 0.122
 Po 2.502 4.9 0.117 0.003 0.010 0.002 0.129
 Pv 2.487 5.4 0.121 0.014 0.005 0.001 0.161
 PcM 1.689 15.9 0.098 0.004 ND ND 0.044
 PoM 2.244 5.0 0.102 0.000 0.008 0.001 0.085
 PvM 2.103 5.9 0.109 0.008 0.004 0.001 0.115
 Raw 1.421 4.1 12.3 0.207 0.016 0.008 0.004 0.138
 Pc 1.426 6.1 9.6 0.182 0.006 0.005 ND 0.060
 Po 1.202 3.6 1.4 0.152 0.004 0.005 ND 0.059
 Pv 1.381 5.7 8.3 0.179 0.009 0.005 ND 0.081
 PcM 1.430 9.5 9.4 0.176 0.005 0.004 ND 0.050
 PoM 1.146 3.9 0.9 0.135 0.002 0.003 ND 0.036
 PvM 1.367 8.6 7.6 0.156 0.004 0.004 ND 0.056
  1. ND not detected
  2. aPercentage of subunits vs (S + G + H)
  3. bLinkages are relative to the methoxy
  4. cRatio of (β-5′ + β-β′ + β-1′)/ β-O-4′