TABLE 2.
Amount of lignin substructure of LCC preparations along with Mw and PDI.
| Samples | LCC4 | LCC8 | LLCC4 | ELCC4 |
|---|---|---|---|---|
| Mw | 14,327 | 11,481 | 12,223 | 9,807 |
| Mn | 9,372 | 7,934 | 8,515 | 6,651 |
| Mw/Mn | 1.5 | 1.4 | 1.4 | 1.5 |
| Interunit linkages a | ||||
| β−O−4′ | 44.1 | 41.5 | 40.4 | 42.3 |
| β−5′ | 7.8 | 9.3 | 11.2 | 7.9 |
| β−β′ | 4.7 | 5.1 | 5.6 | 5.3 |
| Condensed degree b | 22.1 | 25.8 | 29.4 | 23.8 |
| Aromatic units c | ||||
| H | 9 | 8 | 8 | 9 |
| G | 52 | 52 | 49 | 50 |
| S | 39 | 40 | 43 | 42 |
| S/G ratio | 0.75 | 0.77 | 0.88 | 0.84 |
a
Molar percentage (H + G + S = 100).
b
Condensed degree, % = 100 * (IBα+ ICα)/(IA + IBα+ ICα), which is referred to as the integral value of each signal in 2D HSQC NMR.
c
Interunit linkages molar contents as percentages of lignin content (H + G + S).