Table 3.
Content in lignin and β-O-4′ inter-unit cross-linkages of untreated (UN) and pretreated samples (from ref. 32) and correlation coefficient between [β-O-4′] and fluorescence maximum intensity (from Table 2).
| [lignin] (% in weight) | [β-O-4′] (% of aromatic rings) | Fluorescence maximum intensity | Correlation coefficient | ||
|---|---|---|---|---|---|
| Miscanthus | UN | 25.5 | 42.1 | 8100 | 0.99 |
| CSF 2.0 | 27.2 | 13.3 | 2450 | ||
| CSF 2.6 | 29.1 | 8.5 | 1480 | ||
| CSF 2.7 | 29.6 | 4.2 | 1462 | ||
| CSF 2.8 | 29.7 | ND | 1342 | ||
| Poplar | UN | 29.5 | 43.1 | 8307 | 0.91 |
| CSF 2.0 | 30.5 | 31.0 | 3225 | ||
| CSF 2.6 | 33.0 | 13.0 | 1862 | ||
| CSF 2.7 | ND | ND | ND | ||
| CSF 2.8 | 33.4 | 6.8 | 1409 | ||
| Wheat straw | UN | 24.6 | 45.3 | 7536 | 0.99 |
| CSF 2.0 | 24.6 | 20.3 | 5086 | ||
| CSF 2.6 | 27.3 | 12.4 | 3921 | ||
| CSF 2.7 | 27.2 | 8.1 | 4030 | ||
| CSF 2.8 | 30.1 | 9.3 | 3994 |