Table 2. Degree of γ-Acylation and Diastereomer Ratio of β-O-4′ Aryl Ethers in Lignin Isolates of Residual Wheat Straw during Growth of C. subvermispora. Determined Using Semiquantitative HSQC NMR Spectroscopy.
| free
(weeks) |
bound
(weeks) |
|||||||
|---|---|---|---|---|---|---|---|---|
| 0 | 1 | 3 | 7 | 0 | 1 | 3 | 7 | |
| γ-acylation (%) | 10 | 13 | 14 | 16 | 23 | 24 | 23 | 25 |
| erythro/threoa | 2.2 | 2.6 | 2.8 | 4.0 | 2.6 | 2.5 | 2.9 | 2.9 |
a
Ratio of Aβ(S/G-S)erythro and Aβ(S/G-S)threo; diastereomers for β-O-4′ aryl ethers coupled to G-units were not resolved.