Typical chemical shifts/integration regions and hydroxyl group content in separated lignin.
Aliphatic OH | Phenolic OH | ||||||
---|---|---|---|---|---|---|---|
CS | NCS | CG | NCG | NCH | COOH | ||
δ (ppm) | 146.0–149.0 | 143.2–144.5 | 142.1–143.2 | 141.4–142.1 | 138.8–140.2 | 137.1–138.5 | 134.2–135.5 |
OH (mmol g−1) | 7.78 | 1.78 | 3.55 | 0.97 | 3.71 | 4.29 | 0.59 |