Table 4.
Relative content of the phenolic units conjugated with α-carbonyl group given with respect to the total OH phenolic and antioxidant activity of lignins.
| Sample | Relative Content of the Phenolic Units Conjugated with α-Carbonyl Group, vs. Total Phenolic Groups, % | Number of Scavenged DPPH• Radicals Per One Phenolic OH Group |
|---|---|---|
| Flax soda lignin CH2Cl2 fraction | 14.0 | 0.71 ± 0.04 |
| Flax soda lignin CH2Cl2 fraction modified | 6.0 | 2.05 ± 0.8 |
| Black alder soda lignin CH2Cl2fraction | 36.5 | 0.69 ± 0.03 |
| Black alder soda lignin CH2Cl2fraction, modified | 13.9 | 1.80 ± 0.02 |
| Ash-tree soda lignin CH2Cl2 fraction | 25.6 | 0.72 ± 0.04 |
| Ash-tree soda lignin CH2Cl2fraction, modified | 11.3 | 1.26 ± 0.07 |
| TBHQ | - | 1.31 ± 0.05 |
| Irganox 1010 | - | 1.31 ± 0.07 |