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| Oxidative products | KL | F1 | F2 | F3 | F4 | Pine KL18 |
|---|---|---|---|---|---|---|
| Syringaldehyde | 12.2 | 4.2 | 10.0 | 15.5 | 4.1 | N.D. |
| Syringic acid | 6.3 | 7.0 | 8.0 | 3.9 | 1.3 | N.D. |
| 4-Hydroxybenzaldehyde | 1.8 | 1.8 | 0.8 | 1.8 | 13.4 | 0.4 |
| 4-Hydroxybenzoic acid | 1.2 | 2.2 | 2.8 | 0.9 | 3.1 | N.D. |
| Vanillin | 5.7 | 8.5 | 3.2 | 4.0 | 8.1 | 4.3 |
| Vanillic acid | N.D. | N.D. | N.D. | N.D. | 0.4 | 17.3 |
| Total | 27.2 | 23.7 | 24.8 | 26.1 | 29.9 | 22.0 |
N.D. stands for not detected.
