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Table 3 Semi-quantitative information of lignin samples

From: A structured understanding of cellobiohydrolase I binding to poplar lignin fractions after dilute acid pretreatment

Lignin substructure δC/δH (ppm) L 1 L 2 L 3 H 1 H 2 H 3
%a %a %a %a %a %a
S 103.1/6.60 32.4 ± 1.8 49.1 ± 0.3 48.2 ± 0.8 41.1 ± 0.7 38.5 ± 0.2 34.8 ± 0.3
S’ 106.0/7.23 7.1 ± 0.1 7.7 ± 0.0 7.1 ± 0.6 8.5 ± 0.2 5.7 ± 0.4 5.5 ± 0.0
S condensed 105.4/6.42 45.3 ± 1.2 26.8 ± 0.0 29.0 ± 0.0 38.5 ± 0.5 39.8 ± 0.1 40.7 ± 0.1
Total S 84.6 ± 0.3 83.6 ± 0.3 84.3 ± 0.2 88.1 ± 0.0 83.9 ± 0.4 81.0 ± 0.1
G 110.2/6.91 8.1 ± 0.1 14.5 ± 0.0 13.5 ± 0.4 9.5 ± 0.0 14.5 ± 0.3 16.6 ± 0.0
G condensed 112.0/6.65 7.3 ± 0.6 2.5 ± 0.4 2.1 ± 0.2 2.4 ± 0.0 1.6 ± 0.0 2.4 ± 0.0
Total G 15.4 ± 0.4 17.0 ± 0.4 15.7 ± 0.2 11.2 ± 0.0 16.1 ± 0.4 19.0 ± 0.1
PB 130.9/7.63 7.5 ± 0.0 7.9 ± 0.2 9.5 ± 0.3 4.2 ± 0.2 6.0 ± 0.7 6.1 ± 0.4
S/G 5.5 ± 0.1 4.9 ± 0.1 5.4 ± 0.1 7.4 ± 0.0 5.2 ± 0.1 4.3 ± 0.0
β-O-4 71.6/4.85 66.5 ± 0.0 71.2 ± 0.7 76.2 ± 2.7 59.5 ± 1.0 70.8 ± 2.0 74.9 ± 1.0
β-5 87.0/5.43 11.7 ± 0.0 10.7 ± 0.6 6.7 ± 0.8 17.1 ± 1.5 9.5 ± 0.7 7.8 ± 0.8
β–β 85.0/4.63 21.8 ± 0.0 18.1 ± 1.3 17.2 ± 1.8 23.4 ± 0.4 19.8 ± 0.3 17.3 ± 0.2
  1. a Amount of specific functional group was expressed as percentage of S + G for S, G and PB; of total side chain for β-O-4, β-5 and β–β