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Sustainable Chemical Processes

Table 6 Concentrations of functional groups and molecular weight distributions of the lignin fractions

From: Unraveling the structural characteristics of lignin in hydrothermal pretreated fibers and manufactured binderless boards from Eucalyptus grandis

Lignin sample

Functional groups concentration (mmol/g)a

Molecular weight (g/mol)b

 

AlkOH

Cond. PhOH

S–OH

G–OH

H–OH

COOH

Total OH

Mw

Mn

Mw/Mn

Control

4.61

0.21

0.24

0.51

0.14

0.11

5.82

16800

7460

2.25

F4-a

5.08

0.16

0.26

0.45

0.07

0.08

6.10

17500

7660

2.29

F4-b

4.94

0.16

0.30

0.42

0.06

0.08

5.96

16600

7440

2.23

  1. aQuantitative 31P NMR determination of functional groups: AlkOH, aliphatic hydroxyl; cond. PhOH, condensed phenolic hydroxyl; S–OH, syringyl hydroxyl; G–OH, guaiacyl hydroxyl; H–OH, p-hydroxyphenyl hydroxyl; and COOH, carboxylic groups.
  2. bMw, weight average molecular weight; Mn, number average molecular weight.
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