Purity, chemical structure parameters and molecular weight properties of lignins.
| OS | KS | OE | KE | |
|---|---|---|---|---|
| Klason (%) | 94.3 | 88.5 | 83.7 | 58.6 |
| ASL (%) | 3.1 | 2.3 | 1.6 | 6.3 |
| Ash (%) | 3.2 | 2.5 | 3.6 | 22.4 |
| Carbohydrates (%)a | 9.7 | 2.7 | 4.1 | 2.9 |
| OCH3b | 0.7 | 0.85 | 1.19 | 1.14 |
| COOHc | 0.23 | 0.4 | 0.11 | 0.88 |
| H/G/Sa | 23.1/76.9/nd | 17.7/81.6/nd | 6.1/31.1/62.9 | 12.4/28.4/59.2 |
| S-containinga | nd | 0.26 | nd | 0.87 |
| Mnd | 1065 | 1540 | 1567 | 1059 |
| Mwd | 3081 | 7195 | 5079 | 2653 |
| IPd | 2.9 | 4.7 | 3.2 | 2.5 |
a
Determined by Py-GC/MS.
b
Determined by 13C NMR and expressed as functional groups per C9.
c
Determined by 31P NMR.
d
Determined by gel permeation chromatography.